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+/***********************************************************************************************************************
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+ * Copyright [2020-2021] Renesas Electronics Corporation and/or its affiliates. All Rights Reserved.
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+ *
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+ * This software and documentation are supplied by Renesas Electronics America Inc. and may only be used with products
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+ * of Renesas Electronics Corp. and its affiliates ("Renesas"). No other uses are authorized. Renesas products are
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+ * sold pursuant to Renesas terms and conditions of sale. Purchasers are solely responsible for the selection and use
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+ * of Renesas products and Renesas assumes no liability. No license, express or implied, to any intellectual property
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+ * right is granted by Renesas. This software is protected under all applicable laws, including copyright laws. Renesas
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+ * reserves the right to change or discontinue this software and/or this documentation. THE SOFTWARE AND DOCUMENTATION
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+ * IS DELIVERED TO YOU "AS IS," AND RENESAS MAKES NO REPRESENTATIONS OR WARRANTIES, AND TO THE FULLEST EXTENT
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+ * PERMISSIBLE UNDER APPLICABLE LAW, DISCLAIMS ALL WARRANTIES, WHETHER EXPLICITLY OR IMPLICITLY, INCLUDING WARRANTIES
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+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NONINFRINGEMENT, WITH RESPECT TO THE SOFTWARE OR
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+ * DOCUMENTATION. RENESAS SHALL HAVE NO LIABILITY ARISING OUT OF ANY SECURITY VULNERABILITY OR BREACH. TO THE MAXIMUM
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+ * EXTENT PERMITTED BY LAW, IN NO EVENT WILL RENESAS BE LIABLE TO YOU IN CONNECTION WITH THE SOFTWARE OR DOCUMENTATION
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+ * (OR ANY PERSON OR ENTITY CLAIMING RIGHTS DERIVED FROM YOU) FOR ANY LOSS, DAMAGES, OR CLAIMS WHATSOEVER, INCLUDING,
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+ * WITHOUT LIMITATION, ANY DIRECT, CONSEQUENTIAL, SPECIAL, INDIRECT, PUNITIVE, OR INCIDENTAL DAMAGES; ANY LOST PROFITS,
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+ * OTHER ECONOMIC DAMAGE, PROPERTY DAMAGE, OR PERSONAL INJURY; AND EVEN IF RENESAS HAS BEEN ADVISED OF THE POSSIBILITY
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+ * OF SUCH LOSS, DAMAGES, CLAIMS OR COSTS.
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+ **********************************************************************************************************************/
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+
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+/***********************************************************************************************************************
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+ * Includes
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+ **********************************************************************************************************************/
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+#include "r_spi.h"
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+#include "r_spi_cfg.h"
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+
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+/***********************************************************************************************************************
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+ * Macro definitions
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+ **********************************************************************************************************************/
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+
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+/** "SPI" in ASCII, used to determine if channel is open. */
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+#define SPI_OPEN (0x52535049ULL)
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+
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+/** SPI base register access macro. */
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+#define SPI_REG(channel) ((R_SPI0_Type *) ((uint32_t) R_SPI0 + \
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+ ((uint32_t) R_SPI1 - (uint32_t) R_SPI0) * \
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+ (channel)))
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+
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+#define SPI_DTC_MAX_TRANSFER (0x10000)
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+
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+#define SPI_DTC_RX_TRANSFER_SETTINGS ((TRANSFER_MODE_NORMAL << TRANSFER_SETTINGS_MODE_BITS) | \
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+ (TRANSFER_SIZE_1_BYTE << TRANSFER_SETTINGS_SIZE_BITS) | \
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+ (TRANSFER_ADDR_MODE_FIXED << TRANSFER_SETTINGS_SRC_ADDR_BITS) | \
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+ (TRANSFER_IRQ_END << TRANSFER_SETTINGS_IRQ_BITS) | \
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+ (TRANSFER_ADDR_MODE_INCREMENTED << TRANSFER_SETTINGS_DEST_ADDR_BITS))
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+
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+#define SPI_DTC_TX_TRANSFER_SETTINGS ((TRANSFER_MODE_NORMAL << TRANSFER_SETTINGS_MODE_BITS) | \
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+ (TRANSFER_SIZE_1_BYTE << TRANSFER_SETTINGS_SIZE_BITS) | \
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+ (TRANSFER_ADDR_MODE_INCREMENTED << TRANSFER_SETTINGS_SRC_ADDR_BITS) | \
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+ (TRANSFER_IRQ_END << TRANSFER_SETTINGS_IRQ_BITS) | \
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+ (TRANSFER_ADDR_MODE_FIXED << TRANSFER_SETTINGS_DEST_ADDR_BITS))
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+
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+#define SPI_CLK_N_DIV_MULTIPLIER (512U) ///< Maximum divider for N=0
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+#define SPI_CLK_MAX_DIV (4096U) ///< Maximum SPI CLK divider
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+#define SPI_CLK_MIN_DIV (2U) ///< Minimum SPI CLK divider
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+
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+/* SPCMD0 Bit Field Definitions */
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+#define R_SPI0_SPCMD0_CPHA_Pos (0U) ///< Clock Phase setting offset
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+#define R_SPI0_SPCMD0_CPHA_Msk (1U << R_SPI0_SPCMD0_CPHA_Pos) ///< Clock Phase setting mask
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+#define R_SPI0_SPCMD0_CPOL_Pos (1U) ///< Clock Polarity setting offset
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+#define R_SPI0_SPCMD0_CPOL_Msk (1U << R_SPI0_SPCMD0_CPOL_Pos) ///< Clock Polarity setting mask
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+#define R_SPI0_SPCMD0_BRDV_Pos (2U) ///< Bitrate division setting offset
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+#define R_SPI0_SPCMD0_BRDV_Msk (0x0003U << R_SPI0_SPCMD0_BRDV_Pos) ///< Bitrate division setting mask
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+#define R_SPI0_SPCMD0_SSLA_Pos (4U) ///< SSL Signal selection setting offset
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+#define R_SPI0_SPCMD0_SSLA_Msk (0x0007U << R_SPI0_SPCMD0_SSLA_Pos) ///< SSL Signal selection setting mask
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+#define R_SPI0_SPCMD0_SSLKP_Pos (7U) ///< SSL Level Keep setting offset
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+#define R_SPI0_SPCMD0_SSLKP_Msk (1U << R_SPI0_SPCMD0_SSLKP_Pos) ///< SSL Level Keep setting mask
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+#define R_SPI0_SPCMD0_SPB_Pos (8U) ///< Bit Width setting offset
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+#define R_SPI0_SPCMD0_SPB_Msk (0x000FU << R_SPI0_SPCMD0_SPB_Pos) ///< Bit Width setting mask
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+#define R_SPI0_SPCMD0_LSBF_Pos (12U) ///< LSB/MSB setting offset
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+#define R_SPI0_SPCMD0_LSBF_Msk (1U << R_SPI0_SPCMD0_LSBF_Pos) ///< LSB/MSB setting mask
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+#define R_SPI0_SPCMD0_SPNDEN_Pos (13) ///< SPI Next-Access Delay Enable setting offset
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+#define R_SPI0_SPCMD0_SPNDEN_Msk (1U << R_SPI0_SPCMD0_SPNDEN_Pos) ///< SPI Next-Access Delay Enable setting mask
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+#define R_SPI0_SPCMD0_SLNDEN_Pos (14) ///< SSL Negation Delay Setting Enable setting offset
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+#define R_SPI0_SPCMD0_SLNDEN_Msk (1U << R_SPI0_SPCMD0_SLNDEN_Pos) ///< SSL Negation Delay Setting Enable setting mask
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+#define R_SPI0_SPCMD0_SCKDEN_Pos (15) ///< RSPCK Delay Setting Enable setting offset
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+#define R_SPI0_SPCMD0_SCKDEN_Msk (1U << R_SPI0_SPCMD0_SCKDEN_Pos) ///< RSPCK Delay Setting Enable setting mask
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+
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+/***********************************************************************************************************************
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+ * Typedef definitions
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+ **********************************************************************************************************************/
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+#if defined(__ARMCC_VERSION) || defined(__ICCARM__)
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+typedef void (BSP_CMSE_NONSECURE_CALL * spi_prv_ns_callback)(spi_callback_args_t * p_args);
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+#elif defined(__GNUC__)
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+typedef BSP_CMSE_NONSECURE_CALL void (*volatile spi_prv_ns_callback)(spi_callback_args_t * p_args);
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+#endif
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+
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+/***********************************************************************************************************************
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+ * Private function declarations
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+ **********************************************************************************************************************/
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+static fsp_err_t r_spi_transfer_config(spi_cfg_t const * const p_cfg);
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+static void r_spi_hw_config(spi_instance_ctrl_t * p_ctrl);
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+static void r_spi_nvic_config(spi_instance_ctrl_t * p_ctrl);
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+
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+static void r_spi_bit_width_config(spi_instance_ctrl_t * p_ctrl);
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+static void r_spi_start_transfer(spi_instance_ctrl_t * p_ctrl);
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+static fsp_err_t r_spi_write_read_common(spi_ctrl_t * const p_api_ctrl,
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+ void const * p_src,
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+ void * p_dest,
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+ uint32_t const length,
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+ spi_bit_width_t const bit_width);
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+
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+static void r_spi_receive(spi_instance_ctrl_t * p_ctrl);
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+static void r_spi_transmit(spi_instance_ctrl_t * p_ctrl);
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+static void r_spi_call_callback(spi_instance_ctrl_t * p_ctrl, spi_event_t event);
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+
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+/***********************************************************************************************************************
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+ * ISR prototypes
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+ **********************************************************************************************************************/
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+void spi_rxi_isr(void);
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+void spi_txi_isr(void);
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+void spi_tei_isr(void);
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+void spi_eri_isr(void);
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+
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+/***********************************************************************************************************************
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+ * Private global variables
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+ **********************************************************************************************************************/
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+
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+/***********************************************************************************************************************
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+ * Global variables
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+ **********************************************************************************************************************/
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+
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+/* SPI implementation of SPI interface. */
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+const spi_api_t g_spi_on_spi =
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+{
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+ .open = R_SPI_Open,
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+ .read = R_SPI_Read,
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+ .write = R_SPI_Write,
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+ .writeRead = R_SPI_WriteRead,
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+ .close = R_SPI_Close,
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+ .callbackSet = R_SPI_CallbackSet
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+};
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+
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+/*******************************************************************************************************************//**
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+ * @addtogroup SPI
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+ * @{
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+ **********************************************************************************************************************/
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+
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+/***********************************************************************************************************************
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+ * Functions
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+ **********************************************************************************************************************/
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+
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+/*******************************************************************************************************************//**
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+ * This functions initializes a channel for SPI communication mode. Implements @ref spi_api_t::open.
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+ *
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+ * This function performs the following tasks:
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+ * - Performs parameter checking and processes error conditions.
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+ * - Configures the pperipheral registers acording to the configuration.
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+ * - Initialize the control structure for use in other @ref SPI_API functions.
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+ *
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+ * @retval FSP_SUCCESS Channel initialized successfully.
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+ * @retval FSP_ERR_ALREADY_OPEN Instance was already initialized.
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+ * @retval FSP_ERR_ASSERTION An invalid argument was given in the configuration structure.
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+ * @retval FSP_ERR_UNSUPPORTED A requested setting is not possible on this device with the current build
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+ * configuration.
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+ * @retval FSP_ERR_IP_CHANNEL_NOT_PRESENT The channel number is invalid.
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+ * @return See @ref RENESAS_ERROR_CODES or functions called by this function for other possible return codes. This
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+ * function calls: @ref transfer_api_t::open
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+ * @note This function is reentrant.
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+ **********************************************************************************************************************/
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+fsp_err_t R_SPI_Open (spi_ctrl_t * p_api_ctrl, spi_cfg_t const * const p_cfg)
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+{
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+ fsp_err_t err = FSP_SUCCESS;
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+
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+ spi_instance_ctrl_t * p_ctrl = (spi_instance_ctrl_t *) p_api_ctrl;
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+
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+#if SPI_CFG_PARAM_CHECKING_ENABLE
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+ FSP_ASSERT(NULL != p_ctrl);
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+ FSP_ERROR_RETURN(SPI_OPEN != p_ctrl->open, FSP_ERR_ALREADY_OPEN);
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+ FSP_ASSERT(NULL != p_cfg);
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+ FSP_ASSERT(NULL != p_cfg->p_callback);
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+ FSP_ASSERT(NULL != p_cfg->p_extend);
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+ FSP_ERROR_RETURN(BSP_FEATURE_SPI_MAX_CHANNEL > p_cfg->channel, FSP_ERR_IP_CHANNEL_NOT_PRESENT);
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+ FSP_ASSERT(p_cfg->rxi_irq >= 0);
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+ FSP_ASSERT(p_cfg->txi_irq >= 0);
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+ FSP_ASSERT(p_cfg->tei_irq >= 0);
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+ FSP_ASSERT(p_cfg->eri_irq >= 0);
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+
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+ /* CPHA=0 is not supported in slave mode because of hardware limitations. Reference section 38.3.10.2(3) "Slave
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+ * mode operation" in the RA6M3 manual R01UH0886EJ0100. */
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+ if (SPI_MODE_SLAVE == p_cfg->operating_mode)
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+ {
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+ FSP_ERROR_RETURN(SPI_CLK_PHASE_EDGE_EVEN == p_cfg->clk_phase, FSP_ERR_UNSUPPORTED);
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+ }
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+
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+ #if BSP_FEATURE_SPI_HAS_SSL_LEVEL_KEEP == 0 || SPI_TRANSMIT_FROM_RXI_ISR == 1
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+ spi_extended_cfg_t * p_extend = (spi_extended_cfg_t *) p_cfg->p_extend;
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+ #endif
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+ #if SPI_TRANSMIT_FROM_RXI_ISR == 1
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+
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+ /* Half Duplex - Transmit Only mode is not supported when transmit interrupt is handled in the RXI ISR. */
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+ FSP_ERROR_RETURN(p_extend->spi_comm != SPI_COMMUNICATION_TRANSMIT_ONLY, FSP_ERR_UNSUPPORTED);
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+
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+ /* When the TXI Interrupt is handled in the RXI ISR, a TX DTC instance must be present if there is a
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+ * RX DTC instance present otherwise the TXI Interrupts will not be processed. */
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+ if (p_cfg->p_transfer_rx)
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+ {
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+ FSP_ERROR_RETURN(0 != p_cfg->p_transfer_tx, FSP_ERR_UNSUPPORTED);
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+ }
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+ #endif
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+
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+ #if BSP_FEATURE_SPI_HAS_SSL_LEVEL_KEEP == 0
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+ if ((SPI_MODE_MASTER == p_cfg->operating_mode))
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+ {
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+ /* 4-Wire Mode is not supported in master mode on devices without SSL_LEVEL_KEEP */
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+ FSP_ERROR_RETURN(SPI_SSL_MODE_SPI != p_extend->spi_clksyn, FSP_ERR_UNSUPPORTED);
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+ }
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+ #endif
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+#endif
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+
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+ /* Configure transfers if they are provided in p_cfg. */
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+ err = r_spi_transfer_config(p_cfg);
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+ FSP_ERROR_RETURN(FSP_SUCCESS == err, err);
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+
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+ /* Get the register address of the channel. */
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+ p_ctrl->p_cfg = p_cfg;
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+ p_ctrl->p_callback = p_cfg->p_callback;
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+ p_ctrl->p_context = p_cfg->p_context;
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+ p_ctrl->p_callback_memory = NULL;
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+
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+ p_ctrl->p_regs = SPI_REG(p_ctrl->p_cfg->channel);
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+
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+ /* Configure hardware registers according to the r_spi_api configuration structure. */
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+ r_spi_hw_config(p_ctrl);
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+
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+ /* Enable interrupts in NVIC. */
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+ r_spi_nvic_config(p_ctrl);
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+
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+ p_ctrl->open = SPI_OPEN;
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+
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+ return err;
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+}
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+
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+/*******************************************************************************************************************//**
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+ * This function receives data from a SPI device. Implements @ref spi_api_t::read.
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+ *
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+ * The function performs the following tasks:
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+ * - Performs parameter checking and processes error conditions.
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+ * - Sets up the instance to complete a SPI read operation.
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+ *
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+ * @retval FSP_SUCCESS Read operation successfully completed.
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+ * @retval FSP_ERR_ASSERTION NULL pointer to control or destination parameters or transfer length is zero.
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+ * @retval FSP_ERR_NOT_OPEN The channel has not been opened. Open channel first.
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+ * @retval FSP_ERR_IN_USE A transfer is already in progress.
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+ **********************************************************************************************************************/
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+fsp_err_t R_SPI_Read (spi_ctrl_t * const p_api_ctrl,
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+ void * p_dest,
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+ uint32_t const length,
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+ spi_bit_width_t const bit_width)
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+{
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+ return r_spi_write_read_common(p_api_ctrl, NULL, p_dest, length, bit_width);
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+}
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+
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+/*******************************************************************************************************************//**
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+ * This function transmits data to a SPI device using the TX Only Communications Operation Mode.
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+ * Implements @ref spi_api_t::write.
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+ *
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+ * The function performs the following tasks:
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+ * - Performs parameter checking and processes error conditions.
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+ * - Sets up the instance to complete a SPI write operation.
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+ *
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+ * @retval FSP_SUCCESS Write operation successfully completed.
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+ * @retval FSP_ERR_ASSERTION NULL pointer to control or source parameters or transfer length is zero.
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+ * @retval FSP_ERR_NOT_OPEN The channel has not been opened. Open the channel first.
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+ * @retval FSP_ERR_IN_USE A transfer is already in progress.
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+ **********************************************************************************************************************/
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+fsp_err_t R_SPI_Write (spi_ctrl_t * const p_api_ctrl,
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+ void const * p_src,
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+ uint32_t const length,
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+ spi_bit_width_t const bit_width)
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+{
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+ return r_spi_write_read_common(p_api_ctrl, p_src, NULL, length, bit_width);
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+}
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+
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+/*******************************************************************************************************************//**
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+ * This function simultaneously transmits and receive data. Implements @ref spi_api_t::writeRead.
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+ *
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+ * The function performs the following tasks:
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+ * - Performs parameter checking and processes error conditions.
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+ * - Sets up the instance to complete a SPI writeRead operation.
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+ *
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+ * @retval FSP_SUCCESS Write operation successfully completed.
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+ * @retval FSP_ERR_ASSERTION NULL pointer to control, source or destination parameters or
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+ * transfer length is zero.
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+ * @retval FSP_ERR_NOT_OPEN The channel has not been opened. Open the channel first.
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+ * @retval FSP_ERR_IN_USE A transfer is already in progress.
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+ *********************************************************************************************************************/
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+fsp_err_t R_SPI_WriteRead (spi_ctrl_t * const p_api_ctrl,
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+ void const * p_src,
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+ void * p_dest,
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+ uint32_t const length,
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+ spi_bit_width_t const bit_width)
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+{
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+#if SPI_CFG_PARAM_CHECKING_ENABLE
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+ FSP_ASSERT(p_src != NULL);
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+ FSP_ASSERT(p_dest != NULL);
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+#endif
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+
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+ return r_spi_write_read_common(p_api_ctrl, p_src, p_dest, length, bit_width);
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+}
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+
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+/*******************************************************************************************************************//**
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+ * Updates the user callback and has option of providing memory for callback structure.
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+ * Implements spi_api_t::callbackSet
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+ *
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+ * @retval FSP_SUCCESS Callback updated successfully.
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+ * @retval FSP_ERR_ASSERTION A required pointer is NULL.
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+ * @retval FSP_ERR_NOT_OPEN The control block has not been opened.
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+ * @retval FSP_ERR_NO_CALLBACK_MEMORY p_callback is non-secure and p_callback_memory is either secure or NULL.
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+ **********************************************************************************************************************/
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+fsp_err_t R_SPI_CallbackSet (spi_ctrl_t * const p_api_ctrl,
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+ void ( * p_callback)(spi_callback_args_t *),
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+ void const * const p_context,
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+ spi_callback_args_t * const p_callback_memory)
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+{
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+ spi_instance_ctrl_t * p_ctrl = (spi_instance_ctrl_t *) p_api_ctrl;
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+
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+#if (SPI_CFG_PARAM_CHECKING_ENABLE)
|
|
|
+ FSP_ASSERT(p_ctrl);
|
|
|
+ FSP_ASSERT(p_callback);
|
|
|
+ FSP_ERROR_RETURN(SPI_OPEN == p_ctrl->open, FSP_ERR_NOT_OPEN);
|
|
|
+#endif
|
|
|
+
|
|
|
+#if BSP_TZ_SECURE_BUILD
|
|
|
+
|
|
|
+ /* Get security state of p_callback */
|
|
|
+ bool callback_is_secure =
|
|
|
+ (NULL == cmse_check_address_range((void *) p_callback, sizeof(void *), CMSE_AU_NONSECURE));
|
|
|
+
|
|
|
+ #if SPI_CFG_PARAM_CHECKING_ENABLE
|
|
|
+
|
|
|
+ /* In secure projects, p_callback_memory must be provided in non-secure space if p_callback is non-secure */
|
|
|
+ spi_callback_args_t * const p_callback_memory_checked = cmse_check_pointed_object(p_callback_memory,
|
|
|
+ CMSE_AU_NONSECURE);
|
|
|
+ FSP_ERROR_RETURN(callback_is_secure || (NULL != p_callback_memory_checked), FSP_ERR_NO_CALLBACK_MEMORY);
|
|
|
+ #endif
|
|
|
+#endif
|
|
|
+
|
|
|
+ /* Store callback and context */
|
|
|
+#if BSP_TZ_SECURE_BUILD
|
|
|
+ p_ctrl->p_callback = callback_is_secure ? p_callback :
|
|
|
+ (void (*)(spi_callback_args_t *))cmse_nsfptr_create(p_callback);
|
|
|
+#else
|
|
|
+ p_ctrl->p_callback = p_callback;
|
|
|
+#endif
|
|
|
+ p_ctrl->p_context = p_context;
|
|
|
+ p_ctrl->p_callback_memory = p_callback_memory;
|
|
|
+
|
|
|
+ return FSP_SUCCESS;
|
|
|
+}
|
|
|
+
|
|
|
+/*******************************************************************************************************************//**
|
|
|
+ * This function manages the closing of a channel by the following task. Implements @ref spi_api_t::close.
|
|
|
+ *
|
|
|
+ * Disables SPI operations by disabling the SPI bus.
|
|
|
+ * - Disables the SPI peripheral.
|
|
|
+ * - Disables all the associated interrupts.
|
|
|
+ * - Update control structure so it will not work with @ref SPI_API functions.
|
|
|
+ *
|
|
|
+ * @retval FSP_SUCCESS Channel successfully closed.
|
|
|
+ * @retval FSP_ERR_ASSERTION A required pointer argument is NULL.
|
|
|
+ * @retval FSP_ERR_NOT_OPEN The channel has not been opened. Open the channel first.
|
|
|
+ **********************************************************************************************************************/
|
|
|
+fsp_err_t R_SPI_Close (spi_ctrl_t * const p_api_ctrl)
|
|
|
+{
|
|
|
+ spi_instance_ctrl_t * p_ctrl = (spi_instance_ctrl_t *) p_api_ctrl;
|
|
|
+
|
|
|
+#if SPI_CFG_PARAM_CHECKING_ENABLE
|
|
|
+ FSP_ASSERT(NULL != p_ctrl);
|
|
|
+ FSP_ERROR_RETURN(SPI_OPEN == p_ctrl->open, FSP_ERR_NOT_OPEN);
|
|
|
+#endif
|
|
|
+
|
|
|
+ p_ctrl->open = 0;
|
|
|
+
|
|
|
+#if SPI_DTC_SUPPORT_ENABLE == 1
|
|
|
+ if (NULL != p_ctrl->p_cfg->p_transfer_rx)
|
|
|
+ {
|
|
|
+ p_ctrl->p_cfg->p_transfer_rx->p_api->close(p_ctrl->p_cfg->p_transfer_rx->p_ctrl);
|
|
|
+ }
|
|
|
+
|
|
|
+ if (NULL != p_ctrl->p_cfg->p_transfer_tx)
|
|
|
+ {
|
|
|
+ p_ctrl->p_cfg->p_transfer_tx->p_api->close(p_ctrl->p_cfg->p_transfer_tx->p_ctrl);
|
|
|
+ }
|
|
|
+#endif
|
|
|
+
|
|
|
+ /* Disable interrupts in NVIC. */
|
|
|
+ R_BSP_IrqDisable(p_ctrl->p_cfg->txi_irq);
|
|
|
+ R_BSP_IrqDisable(p_ctrl->p_cfg->rxi_irq);
|
|
|
+ R_BSP_IrqDisable(p_ctrl->p_cfg->tei_irq);
|
|
|
+ R_BSP_IrqDisable(p_ctrl->p_cfg->eri_irq);
|
|
|
+
|
|
|
+ /* Disable the SPI Transfer. */
|
|
|
+ p_ctrl->p_regs->SPCR_b.SPE = 0U;
|
|
|
+
|
|
|
+ /* Clear the status register. */
|
|
|
+
|
|
|
+ /* The status register must be read before cleared. Reference section 38.2.4 SPI Status Register (SPSR) in the
|
|
|
+ * RA6M3 manual R01UH0886EJ0100. */
|
|
|
+ p_ctrl->p_regs->SPSR;
|
|
|
+ p_ctrl->p_regs->SPSR = 0;
|
|
|
+
|
|
|
+ return FSP_SUCCESS;
|
|
|
+}
|
|
|
+
|
|
|
+/*******************************************************************************************************************//**
|
|
|
+ * Calculates the SPBR register value and the BRDV bits for a desired bitrate.
|
|
|
+ * If the desired bitrate is faster than the maximum bitrate, than the bitrate is set to the
|
|
|
+ * maximum bitrate. If the desired bitrate is slower than the minimum bitrate, than an error is returned.
|
|
|
+ *
|
|
|
+ * @param[in] bitrate Desired bitrate
|
|
|
+ * @param[out] spck_div Memory location to store bitrate register settings.
|
|
|
+ *
|
|
|
+ * @retval FSP_SUCCESS Valid spbr and brdv values were calculated
|
|
|
+ * @retval FSP_ERR_UNSUPPORTED Bitrate is not achievable
|
|
|
+ **********************************************************************************************************************/
|
|
|
+fsp_err_t R_SPI_CalculateBitrate (uint32_t bitrate, rspck_div_setting_t * spck_div)
|
|
|
+{
|
|
|
+ /* desired_divider = Smallest integer greater than or equal to SPI_CLK / bitrate. */
|
|
|
+ uint32_t desired_divider = (R_FSP_SystemClockHzGet(BSP_FEATURE_SPI_CLK) + bitrate - 1) / bitrate;
|
|
|
+
|
|
|
+ /* Can't achieve bitrate slower than desired. */
|
|
|
+ if (desired_divider > SPI_CLK_MAX_DIV)
|
|
|
+ {
|
|
|
+ return FSP_ERR_UNSUPPORTED;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (desired_divider < SPI_CLK_MIN_DIV)
|
|
|
+ {
|
|
|
+ /* Configure max bitrate (SPI_CLK / 2) */
|
|
|
+ spck_div->brdv = 0;
|
|
|
+ spck_div->spbr = 0;
|
|
|
+
|
|
|
+ return FSP_SUCCESS;
|
|
|
+ }
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Possible SPI_CLK dividers for values of N:
|
|
|
+ * N = 0; div = [2,4,6,..,512]
|
|
|
+ * N = 1; div = [4,8,12,..,1024]
|
|
|
+ * N = 2; div = [8,16,32,..,2048]
|
|
|
+ * N = 3; div = [16,32,64,..,4096]
|
|
|
+ */
|
|
|
+ uint8_t i;
|
|
|
+ for (i = 0; i < 4; i++)
|
|
|
+ {
|
|
|
+ /* Select smallest value for N possible. */
|
|
|
+
|
|
|
+ /* div <= 512; N = 0
|
|
|
+ * 512 < div <= 1024; N=1
|
|
|
+ * ...
|
|
|
+ */
|
|
|
+ if (desired_divider <= (SPI_CLK_N_DIV_MULTIPLIER << i))
|
|
|
+ {
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ spck_div->brdv = i & 0x03U;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * desired_divider = 2 * (spbr + 1) * 2^i.
|
|
|
+ *
|
|
|
+ * With desired_divider and i known, solve for spbr.
|
|
|
+ *
|
|
|
+ * spbr = SPI_CLK_DIV / (2 * 2^i) - 1
|
|
|
+ */
|
|
|
+ uint32_t spbr_divisor = (2U * (1U << i));
|
|
|
+
|
|
|
+ /* spbr = (Smallest integer greater than or equal to SPI_CLK_DIV / (2 * 2^i)) - 1. */
|
|
|
+ spck_div->spbr = (uint8_t) (((desired_divider + spbr_divisor - 1U) / spbr_divisor) - 1U) & UINT8_MAX;
|
|
|
+
|
|
|
+ return FSP_SUCCESS;
|
|
|
+}
|
|
|
+
|
|
|
+/*******************************************************************************************************************//**
|
|
|
+ * @} (end addtogroup SPI)
|
|
|
+ **********************************************************************************************************************/
|
|
|
+
|
|
|
+/*******************************************************************************************************************//**
|
|
|
+ * Private Functions
|
|
|
+ **********************************************************************************************************************/
|
|
|
+
|
|
|
+/*******************************************************************************************************************//**
|
|
|
+ * Configure the given transfer instances for receiving and transmitting data without CPU intervention.
|
|
|
+ *
|
|
|
+ * @param p_cfg Configuration structure with references to receive and transmit transfer instances.
|
|
|
+ *
|
|
|
+ * @retval FSP_SUCCESS The given transfer instances were configured successfully.
|
|
|
+ * @return See @ref RENESAS_ERROR_CODES for other possible return codes. This function internally
|
|
|
+ * calls @ref transfer_api_t::open.
|
|
|
+ **********************************************************************************************************************/
|
|
|
+static fsp_err_t r_spi_transfer_config (spi_cfg_t const * const p_cfg)
|
|
|
+{
|
|
|
+ fsp_err_t err = FSP_SUCCESS;
|
|
|
+
|
|
|
+#if SPI_DTC_SUPPORT_ENABLE == 1
|
|
|
+ const transfer_instance_t * p_transfer_tx = p_cfg->p_transfer_tx;
|
|
|
+ void * p_spdr = (void *) &(SPI_REG(p_cfg->channel)->SPDR);
|
|
|
+ if (p_transfer_tx)
|
|
|
+ {
|
|
|
+ p_transfer_tx->p_cfg->p_info->transfer_settings_word = SPI_DTC_TX_TRANSFER_SETTINGS;
|
|
|
+ p_transfer_tx->p_cfg->p_info->p_dest = p_spdr;
|
|
|
+
|
|
|
+ err = p_transfer_tx->p_api->open(p_transfer_tx->p_ctrl, p_transfer_tx->p_cfg);
|
|
|
+ FSP_ERROR_RETURN(FSP_SUCCESS == err, err);
|
|
|
+ }
|
|
|
+
|
|
|
+ const transfer_instance_t * p_transfer_rx = p_cfg->p_transfer_rx;
|
|
|
+ if (p_transfer_rx)
|
|
|
+ {
|
|
|
+ p_transfer_rx->p_cfg->p_info->transfer_settings_word = SPI_DTC_RX_TRANSFER_SETTINGS;
|
|
|
+ p_transfer_rx->p_cfg->p_info->p_src = p_spdr;
|
|
|
+
|
|
|
+ err = p_transfer_rx->p_api->open(p_transfer_rx->p_ctrl, p_transfer_rx->p_cfg);
|
|
|
+
|
|
|
+ if ((FSP_SUCCESS != err) && p_transfer_tx)
|
|
|
+ {
|
|
|
+ p_transfer_tx->p_api->close(p_transfer_tx->p_ctrl);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+#else
|
|
|
+ FSP_PARAMETER_NOT_USED(p_cfg);
|
|
|
+#endif
|
|
|
+
|
|
|
+ return err;
|
|
|
+}
|
|
|
+
|
|
|
+/*******************************************************************************************************************//**
|
|
|
+ * Hardware configuration for settings given by the configuration structure.
|
|
|
+ *
|
|
|
+ * @param[in] p_ctrl pointer to control structure.
|
|
|
+ **********************************************************************************************************************/
|
|
|
+static void r_spi_hw_config (spi_instance_ctrl_t * p_ctrl)
|
|
|
+{
|
|
|
+ uint32_t spcr = 0;
|
|
|
+ uint32_t sslp = 0;
|
|
|
+ uint32_t sppcr = 0;
|
|
|
+ uint32_t spcr2 = 0;
|
|
|
+ uint32_t spckd = 0;
|
|
|
+ uint32_t sslnd = 0;
|
|
|
+ uint32_t spnd = 0;
|
|
|
+ uint32_t spcmd0 = 0;
|
|
|
+ uint32_t spdcr2 = 0;
|
|
|
+
|
|
|
+ /* Enable Receive Buffer Full interrupt. */
|
|
|
+ spcr |= R_SPI0_SPCR_SPRIE_Msk;
|
|
|
+
|
|
|
+ /* The TXI interrupt is not needed when TRANSMIT_FROM_RXI_ISR optimization is enabled. */
|
|
|
+#if SPI_TRANSMIT_FROM_RXI_ISR == 0
|
|
|
+
|
|
|
+ /* Enable Transmit Buffer Empty interrupt. */
|
|
|
+ spcr |= R_SPI0_SPCR_SPTIE_Msk;
|
|
|
+#endif
|
|
|
+
|
|
|
+ /* Enable Error interrupt. */
|
|
|
+ spcr |= R_SPI0_SPCR_SPEIE_Msk;
|
|
|
+
|
|
|
+ /* Configure Master Mode setting. */
|
|
|
+ spcr |= (uint32_t) (SPI_MODE_MASTER == p_ctrl->p_cfg->operating_mode) << R_SPI0_SPCR_MSTR_Pos;
|
|
|
+
|
|
|
+ /* Enable SCK Auto Stop setting in order to prevent RX Overflow in Master Mode */
|
|
|
+ spcr2 |= (uint32_t) (SPI_MODE_MASTER == p_ctrl->p_cfg->operating_mode) << R_SPI0_SPCR2_SCKASE_Pos;
|
|
|
+
|
|
|
+ /* Configure CPHA setting. */
|
|
|
+ spcmd0 |= (uint32_t) p_ctrl->p_cfg->clk_phase << R_SPI0_SPCMD0_CPHA_Pos;
|
|
|
+
|
|
|
+ /* Configure CPOL setting. */
|
|
|
+ spcmd0 |= (uint32_t) p_ctrl->p_cfg->clk_polarity << R_SPI0_SPCMD0_CPOL_Pos;
|
|
|
+
|
|
|
+ /* Configure Bit Order (MSB,LSB) */
|
|
|
+ spcmd0 |= (uint32_t) p_ctrl->p_cfg->bit_order << R_SPI0_SPCMD0_LSBF_Pos;
|
|
|
+
|
|
|
+ if (p_ctrl->p_cfg->p_transfer_tx)
|
|
|
+ {
|
|
|
+ /* Transmit Buffer Empty IRQ must be enabled for DTC even if TRANSMIT_FROM_RXI is enabled. */
|
|
|
+ spcr |= R_SPI0_SPCR_SPTIE_Msk;
|
|
|
+ }
|
|
|
+
|
|
|
+ spi_extended_cfg_t * p_extend = ((spi_extended_cfg_t *) p_ctrl->p_cfg->p_extend);
|
|
|
+
|
|
|
+ if (SPI_SSL_MODE_SPI == p_extend->spi_clksyn)
|
|
|
+ {
|
|
|
+#if BSP_FEATURE_SPI_HAS_SSL_LEVEL_KEEP == 1
|
|
|
+
|
|
|
+ /* Configure SSL Level Keep Setting. */
|
|
|
+ spcmd0 |= R_SPI0_SPCMD0_SSLKP_Msk;
|
|
|
+#endif
|
|
|
+
|
|
|
+ /* Configure 4-Wire Mode Setting. */
|
|
|
+ spcr &= ~R_SPI0_SPCR_SPMS_Msk;
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ /* Configure 3-Wire Mode Setting. */
|
|
|
+ spcr |= R_SPI0_SPCR_SPMS_Msk;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Configure Full Duplex or TX Only Setting. */
|
|
|
+ spcr &= (uint32_t) ~(p_extend->spi_comm << R_SPI0_SPCR_SPRIE_Pos),
|
|
|
+ spcr |=
|
|
|
+ (uint32_t) ((p_extend->spi_comm << R_SPI0_SPCR_TXMD_Pos) |
|
|
|
+ (p_extend->spi_comm << R_SPI0_SPCR_SPTIE_Pos));
|
|
|
+
|
|
|
+ /* Configure SSLn polarity setting. */
|
|
|
+ sslp &= ~0x0FU;
|
|
|
+ sslp |= (uint32_t) p_extend->ssl_polarity << p_extend->ssl_select;
|
|
|
+
|
|
|
+ /* Configure SSLn setting. (SSL0, SSL1, SSL2, SSL3)*/
|
|
|
+ spcmd0 &= ~R_SPI0_SPCMD0_SSLA_Msk;
|
|
|
+ spcmd0 |= (uint32_t) p_extend->ssl_select << R_SPI0_SPCMD0_SSLA_Pos;
|
|
|
+
|
|
|
+ if (SPI_MOSI_IDLE_VALUE_FIXING_DISABLE != p_extend->mosi_idle)
|
|
|
+ {
|
|
|
+ /* Enable mosi value fixing */
|
|
|
+ sppcr |= R_SPI0_SPPCR_MOIFE_Msk;
|
|
|
+
|
|
|
+ if (SPI_MOSI_IDLE_VALUE_FIXING_HIGH == p_extend->mosi_idle)
|
|
|
+ {
|
|
|
+ sppcr |= R_SPI0_SPPCR_MOIFV_Msk;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (SPI_PARITY_MODE_DISABLE != p_extend->parity)
|
|
|
+ {
|
|
|
+ /* Enable Parity Mode. */
|
|
|
+ spcr2 |= R_SPI0_SPCR2_SPPE_Msk;
|
|
|
+
|
|
|
+ if (SPI_PARITY_MODE_ODD == p_extend->parity)
|
|
|
+ {
|
|
|
+ /* Configure ODD Parity Setting. */
|
|
|
+ spcr2 |= R_SPI0_SPCR2_SPOE_Msk;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Configure byte swapping for 16/32-Bit mode. */
|
|
|
+ spdcr2 |= p_extend->byte_swap;
|
|
|
+
|
|
|
+ /* Configure the Bit Rate Division Setting */
|
|
|
+ spcmd0 |= (uint32_t) p_extend->spck_div.brdv << R_SPI0_SPCMD0_BRDV_Pos;
|
|
|
+
|
|
|
+ /* Enable all delay settings. */
|
|
|
+ if (SPI_MODE_MASTER == p_ctrl->p_cfg->operating_mode)
|
|
|
+ {
|
|
|
+ /* Note that disabling delay settings is same as setting delay to 1. */
|
|
|
+ spcmd0 |= (uint32_t) R_SPI0_SPCMD0_SPNDEN_Msk | R_SPI0_SPCMD0_SLNDEN_Msk | R_SPI0_SPCMD0_SCKDEN_Msk;
|
|
|
+
|
|
|
+ spckd = p_extend->spck_delay;
|
|
|
+ sslnd = p_extend->ssl_negation_delay;
|
|
|
+ spnd = p_extend->next_access_delay;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Power up the SPI module. */
|
|
|
+ R_BSP_MODULE_START(FSP_IP_SPI, p_ctrl->p_cfg->channel);
|
|
|
+
|
|
|
+ /* Clear the status register. */
|
|
|
+
|
|
|
+ /* The status register must be read before cleared. Reference section 38.2.4 SPI Status Register (SPSR) in the
|
|
|
+ * RA6M3 manual R01UH0886EJ0100. */
|
|
|
+ p_ctrl->p_regs->SPSR;
|
|
|
+ p_ctrl->p_regs->SPSR = 0;
|
|
|
+
|
|
|
+ /* Write registers */
|
|
|
+ p_ctrl->p_regs->SPCR = (uint8_t) spcr;
|
|
|
+ p_ctrl->p_regs->SSLP = (uint8_t) sslp;
|
|
|
+ p_ctrl->p_regs->SPPCR = (uint8_t) sppcr;
|
|
|
+ p_ctrl->p_regs->SPBR = p_extend->spck_div.spbr;
|
|
|
+ p_ctrl->p_regs->SPCKD = (uint8_t) spckd;
|
|
|
+ p_ctrl->p_regs->SSLND = (uint8_t) sslnd;
|
|
|
+ p_ctrl->p_regs->SPND = (uint8_t) spnd;
|
|
|
+ p_ctrl->p_regs->SPCR2 = (uint8_t) spcr2;
|
|
|
+ p_ctrl->p_regs->SPCMD[0] = (uint16_t) spcmd0;
|
|
|
+ p_ctrl->p_regs->SPDCR2 = (uint8_t) spdcr2;
|
|
|
+
|
|
|
+#if BSP_FEATURE_SPI_HAS_SPCR3 == 1
|
|
|
+ p_ctrl->p_regs->SPCR3 = R_SPI0_SPCR3_CENDIE_Msk;
|
|
|
+#endif
|
|
|
+}
|
|
|
+
|
|
|
+/*******************************************************************************************************************//**
|
|
|
+ * Enable Receive Buffer Full, Transmit Buffer Empty, and Error Interrupts in the NVIC.
|
|
|
+ *
|
|
|
+ * @param[in] p_ctrl pointer to control structure.
|
|
|
+ **********************************************************************************************************************/
|
|
|
+static void r_spi_nvic_config (spi_instance_ctrl_t * p_ctrl)
|
|
|
+{
|
|
|
+ R_BSP_IrqCfgEnable(p_ctrl->p_cfg->txi_irq, p_ctrl->p_cfg->txi_ipl, p_ctrl);
|
|
|
+ R_BSP_IrqCfgEnable(p_ctrl->p_cfg->rxi_irq, p_ctrl->p_cfg->rxi_ipl, p_ctrl);
|
|
|
+ R_BSP_IrqCfgEnable(p_ctrl->p_cfg->eri_irq, p_ctrl->p_cfg->eri_ipl, p_ctrl);
|
|
|
+
|
|
|
+ R_BSP_IrqCfg(p_ctrl->p_cfg->tei_irq, p_ctrl->p_cfg->tei_ipl, p_ctrl);
|
|
|
+
|
|
|
+ /* Note tei_irq is not enabled until the last data frame is transfered. */
|
|
|
+}
|
|
|
+
|
|
|
+/*******************************************************************************************************************//**
|
|
|
+ * Setup the bit width configuration for a transfer.
|
|
|
+ *
|
|
|
+ * @param[in] p_ctrl pointer to control structure.
|
|
|
+ *
|
|
|
+ * Note: For 8-Bit wide data frames, the devices require the SPBYT bit to enable byte level access to the
|
|
|
+ * data register. Although this register is not documented in some MCU hardware manuals, it does seem to be available
|
|
|
+ * on all of them.
|
|
|
+ **********************************************************************************************************************/
|
|
|
+static void r_spi_bit_width_config (spi_instance_ctrl_t * p_ctrl)
|
|
|
+{
|
|
|
+ uint32_t spdcr = p_ctrl->p_regs->SPDCR;
|
|
|
+ uint32_t spcmd0 = p_ctrl->p_regs->SPCMD[0];
|
|
|
+
|
|
|
+ if (SPI_BIT_WIDTH_16_BITS < p_ctrl->bit_width) /* Bit Widths of 20, 24 or 32 bits */
|
|
|
+ {
|
|
|
+ /* Configure Word access to data register. */
|
|
|
+ spdcr &= ~R_SPI0_SPDCR_SPBYT_Msk;
|
|
|
+ spdcr |= R_SPI0_SPDCR_SPLW_Msk;
|
|
|
+ }
|
|
|
+ else if (SPI_BIT_WIDTH_8_BITS >= p_ctrl->bit_width) /* Bit Width of 8 bits*/
|
|
|
+ {
|
|
|
+ /* Set SPBYT so 8bit transfer works with the DTC/DMAC. */
|
|
|
+ spdcr |= R_SPI0_SPDCR_SPBYT_Msk;
|
|
|
+ }
|
|
|
+ else /* Bit Widths of 9, 10, 11, 12, 13, 14, 15 or 16 bits */
|
|
|
+ {
|
|
|
+ /* Configure Half-Word access to data register. */
|
|
|
+ spdcr &= ~(R_SPI0_SPDCR_SPBYT_Msk | R_SPI0_SPDCR_SPLW_Msk);
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Configure data length based on the selected bit width . */
|
|
|
+ uint32_t bit_width = p_ctrl->bit_width;
|
|
|
+ if (bit_width > SPI_BIT_WIDTH_16_BITS)
|
|
|
+ {
|
|
|
+ bit_width = ((bit_width + 1) >> 2) - 5;
|
|
|
+ }
|
|
|
+
|
|
|
+ spcmd0 &= ~R_SPI0_SPCMD0_SPB_Msk;
|
|
|
+ spcmd0 |= bit_width << R_SPI0_SPCMD0_SPB_Pos;
|
|
|
+
|
|
|
+ p_ctrl->p_regs->SPDCR = (uint8_t) spdcr;
|
|
|
+ p_ctrl->p_regs->SPCMD[0] = (uint16_t) spcmd0;
|
|
|
+}
|
|
|
+
|
|
|
+/*******************************************************************************************************************//**
|
|
|
+ * Initiates a SPI transfer by setting the SPE bit in SPCR.
|
|
|
+ *
|
|
|
+ * @param[in] p_ctrl pointer to control structure.
|
|
|
+ *
|
|
|
+ * Note: When not using the DTC to transmit, this function pre-loads the SPI shift-register and shift-register-buffer
|
|
|
+ * instead of waiting for the transmit buffer empty interrupt. This is required when transmitting from the
|
|
|
+ * Receive Buffer Full interrupt, but it does not interfere with transmitting when using the transmit buffer empty
|
|
|
+ * interrupt.
|
|
|
+ **********************************************************************************************************************/
|
|
|
+static void r_spi_start_transfer (spi_instance_ctrl_t * p_ctrl)
|
|
|
+{
|
|
|
+#if SPI_TRANSMIT_FROM_RXI_ISR == 1
|
|
|
+ if (!p_ctrl->p_cfg->p_transfer_tx)
|
|
|
+ {
|
|
|
+ /* Handle the first two transmit empty events here because transmit interrupt may not be enabled. */
|
|
|
+
|
|
|
+ /* Critical section required so that the txi interrupt can be handled here instead of in the ISR. */
|
|
|
+ FSP_CRITICAL_SECTION_DEFINE;
|
|
|
+ FSP_CRITICAL_SECTION_ENTER;
|
|
|
+
|
|
|
+ /* Enable the SPI Transfer. */
|
|
|
+ p_ctrl->p_regs->SPCR_b.SPE = 1;
|
|
|
+
|
|
|
+ /* Must call transmit to kick off transfer when transmitting from rxi ISR. */
|
|
|
+ r_spi_transmit(p_ctrl); ///< First data immediately copied into the SPI shift register.
|
|
|
+
|
|
|
+ /* Second transmit significantly improves slave mode performance. */
|
|
|
+ r_spi_transmit(p_ctrl); ///< Second data copied into the SPI transmit buffer.
|
|
|
+
|
|
|
+ /* Must clear the txi IRQ status (The interrupt was handled here). */
|
|
|
+ R_BSP_IrqEnable(p_ctrl->p_cfg->txi_irq);
|
|
|
+
|
|
|
+ FSP_CRITICAL_SECTION_EXIT;
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ /* Enable the SPI Transfer. */
|
|
|
+ p_ctrl->p_regs->SPCR_b.SPE = 1;
|
|
|
+ }
|
|
|
+
|
|
|
+#else
|
|
|
+
|
|
|
+ /* Enable the SPI Transfer. */
|
|
|
+ p_ctrl->p_regs->SPCR_b.SPE = 1;
|
|
|
+#endif
|
|
|
+}
|
|
|
+
|
|
|
+/*******************************************************************************************************************//**
|
|
|
+ * Configures the driver state and initiates a SPI transfer for all modes of operation.
|
|
|
+ *
|
|
|
+ * @param[in] p_api_ctrl pointer to control structure.
|
|
|
+ * @param p_src Buffer to transmit data from.
|
|
|
+ * @param p_dest Buffer to store received data in.
|
|
|
+ * @param[in] length Number of transfers
|
|
|
+ * @param[in] bit_width Data frame size (8-Bit, 16-Bit, 32-Bit)
|
|
|
+ *
|
|
|
+ * @retval FSP_SUCCESS Transfer was started successfully.
|
|
|
+ * @retval FSP_ERR_ASSERTION An argument is invalid.
|
|
|
+ * @retval FSP_ERR_NOT_OPEN The instance has not been initialized.
|
|
|
+ * @retval FSP_ERR_IN_USE A transfer is already in progress.
|
|
|
+ * @return See @ref RENESAS_ERROR_CODES for other possible return codes. This function internally
|
|
|
+ * calls @ref transfer_api_t::reconfigure.
|
|
|
+ **********************************************************************************************************************/
|
|
|
+static fsp_err_t r_spi_write_read_common (spi_ctrl_t * const p_api_ctrl,
|
|
|
+ void const * p_src,
|
|
|
+ void * p_dest,
|
|
|
+ uint32_t const length,
|
|
|
+ spi_bit_width_t const bit_width)
|
|
|
+{
|
|
|
+ spi_instance_ctrl_t * p_ctrl = (spi_instance_ctrl_t *) p_api_ctrl;
|
|
|
+
|
|
|
+#if SPI_CFG_PARAM_CHECKING_ENABLE
|
|
|
+ FSP_ASSERT(NULL != p_ctrl);
|
|
|
+ FSP_ERROR_RETURN(SPI_OPEN == p_ctrl->open, FSP_ERR_NOT_OPEN);
|
|
|
+ FSP_ASSERT(p_src || p_dest);
|
|
|
+ FSP_ASSERT(0 != length);
|
|
|
+ if (p_ctrl->p_cfg->p_transfer_tx || p_ctrl->p_cfg->p_transfer_rx)
|
|
|
+ {
|
|
|
+ FSP_ASSERT(length <= SPI_DTC_MAX_TRANSFER);
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Reject bit width settings not compatible with R_SPI */
|
|
|
+ FSP_ASSERT(!((bit_width < SPI_BIT_WIDTH_8_BITS) ||
|
|
|
+ ((bit_width > SPI_BIT_WIDTH_16_BITS) && ((bit_width + 1) & 0x3)) ||
|
|
|
+ (bit_width == SPI_BIT_WIDTH_28_BITS)));
|
|
|
+#endif
|
|
|
+
|
|
|
+ FSP_ERROR_RETURN(0 == (p_ctrl->p_regs->SPCR & R_SPI0_SPCR_SPE_Msk), FSP_ERR_IN_USE);
|
|
|
+
|
|
|
+ p_ctrl->p_tx_data = p_src;
|
|
|
+ p_ctrl->p_rx_data = p_dest;
|
|
|
+ p_ctrl->tx_count = 0;
|
|
|
+ p_ctrl->rx_count = 0;
|
|
|
+ p_ctrl->count = length;
|
|
|
+ p_ctrl->bit_width = bit_width;
|
|
|
+
|
|
|
+#if SPI_DTC_SUPPORT_ENABLE == 1
|
|
|
+ if (p_ctrl->p_cfg->p_transfer_rx)
|
|
|
+ {
|
|
|
+ /* When the rxi interrupt is called, all transfers will be finished. */
|
|
|
+ p_ctrl->rx_count = length;
|
|
|
+
|
|
|
+ /* Configure the receive DMA instance. */
|
|
|
+ if (SPI_BIT_WIDTH_16_BITS < p_ctrl->bit_width)
|
|
|
+ {
|
|
|
+ p_ctrl->p_cfg->p_transfer_rx->p_cfg->p_info->size = TRANSFER_SIZE_4_BYTE;
|
|
|
+ }
|
|
|
+ else if (SPI_BIT_WIDTH_8_BITS >= p_ctrl->bit_width)
|
|
|
+ {
|
|
|
+ p_ctrl->p_cfg->p_transfer_rx->p_cfg->p_info->size = TRANSFER_SIZE_1_BYTE;
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ p_ctrl->p_cfg->p_transfer_rx->p_cfg->p_info->size = TRANSFER_SIZE_2_BYTE;
|
|
|
+ }
|
|
|
+
|
|
|
+ p_ctrl->p_cfg->p_transfer_rx->p_cfg->p_info->dest_addr_mode = TRANSFER_ADDR_MODE_INCREMENTED;
|
|
|
+ p_ctrl->p_cfg->p_transfer_rx->p_cfg->p_info->length = (uint16_t) length;
|
|
|
+ p_ctrl->p_cfg->p_transfer_rx->p_cfg->p_info->p_dest = p_dest;
|
|
|
+
|
|
|
+ if (NULL == p_dest)
|
|
|
+ {
|
|
|
+ static uint32_t dummy_rx;
|
|
|
+ p_ctrl->p_cfg->p_transfer_rx->p_cfg->p_info->dest_addr_mode = TRANSFER_ADDR_MODE_FIXED;
|
|
|
+ p_ctrl->p_cfg->p_transfer_rx->p_cfg->p_info->p_dest = &dummy_rx;
|
|
|
+ }
|
|
|
+
|
|
|
+ fsp_err_t err = p_ctrl->p_cfg->p_transfer_rx->p_api->reconfigure(p_ctrl->p_cfg->p_transfer_rx->p_ctrl,
|
|
|
+ p_ctrl->p_cfg->p_transfer_rx->p_cfg->p_info);
|
|
|
+
|
|
|
+ FSP_ERROR_RETURN(FSP_SUCCESS == err, err);
|
|
|
+ }
|
|
|
+
|
|
|
+ if (p_ctrl->p_cfg->p_transfer_tx)
|
|
|
+ {
|
|
|
+ /* When the txi interrupt is called, all transfers will be finished. */
|
|
|
+ p_ctrl->tx_count = length;
|
|
|
+
|
|
|
+ /* Configure the transmit DMA instance. */
|
|
|
+ if (SPI_BIT_WIDTH_16_BITS < p_ctrl->bit_width)
|
|
|
+ {
|
|
|
+ p_ctrl->p_cfg->p_transfer_tx->p_cfg->p_info->size = TRANSFER_SIZE_4_BYTE;
|
|
|
+ }
|
|
|
+ else if (SPI_BIT_WIDTH_8_BITS >= p_ctrl->bit_width)
|
|
|
+ {
|
|
|
+ p_ctrl->p_cfg->p_transfer_tx->p_cfg->p_info->size = TRANSFER_SIZE_1_BYTE;
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ p_ctrl->p_cfg->p_transfer_tx->p_cfg->p_info->size = TRANSFER_SIZE_2_BYTE;
|
|
|
+ }
|
|
|
+
|
|
|
+ p_ctrl->p_cfg->p_transfer_tx->p_cfg->p_info->src_addr_mode = TRANSFER_ADDR_MODE_INCREMENTED;
|
|
|
+ p_ctrl->p_cfg->p_transfer_tx->p_cfg->p_info->length = (uint16_t) length;
|
|
|
+ p_ctrl->p_cfg->p_transfer_tx->p_cfg->p_info->p_src = p_src;
|
|
|
+
|
|
|
+ if (NULL == p_src)
|
|
|
+ {
|
|
|
+ static uint32_t dummy_tx = 0;
|
|
|
+ p_ctrl->p_cfg->p_transfer_tx->p_cfg->p_info->src_addr_mode = TRANSFER_ADDR_MODE_FIXED;
|
|
|
+ p_ctrl->p_cfg->p_transfer_tx->p_cfg->p_info->p_src = &dummy_tx;
|
|
|
+ }
|
|
|
+
|
|
|
+ fsp_err_t err = p_ctrl->p_cfg->p_transfer_tx->p_api->reconfigure(p_ctrl->p_cfg->p_transfer_tx->p_ctrl,
|
|
|
+ p_ctrl->p_cfg->p_transfer_tx->p_cfg->p_info);
|
|
|
+
|
|
|
+ FSP_ERROR_RETURN(FSP_SUCCESS == err, err);
|
|
|
+ }
|
|
|
+#endif
|
|
|
+
|
|
|
+ r_spi_bit_width_config(p_ctrl);
|
|
|
+ r_spi_start_transfer(p_ctrl);
|
|
|
+
|
|
|
+ return FSP_SUCCESS;
|
|
|
+}
|
|
|
+
|
|
|
+/*******************************************************************************************************************//**
|
|
|
+ * Copy configured bit width from the SPI data register to the current rx data location.
|
|
|
+ * If the receive buffer is NULL, just read the SPI data register.
|
|
|
+ * If the total transfer length has already been received than do nothing.
|
|
|
+ *
|
|
|
+ * @param[in] p_ctrl pointer to control structure.
|
|
|
+ **********************************************************************************************************************/
|
|
|
+static void r_spi_receive (spi_instance_ctrl_t * p_ctrl)
|
|
|
+{
|
|
|
+ uint32_t rx_count = p_ctrl->rx_count;
|
|
|
+ if (rx_count == p_ctrl->count)
|
|
|
+ {
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (0 == p_ctrl->p_rx_data)
|
|
|
+ {
|
|
|
+ /* Read the received data but do nothing with it. */
|
|
|
+ p_ctrl->p_regs->SPDR;
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ if (SPI_BIT_WIDTH_16_BITS < p_ctrl->bit_width) /* Bit Widths of 20, 24 or 32 bits */
|
|
|
+ {
|
|
|
+ ((uint32_t *) (p_ctrl->p_rx_data))[rx_count] = p_ctrl->p_regs->SPDR;
|
|
|
+ }
|
|
|
+ else if (SPI_BIT_WIDTH_8_BITS >= p_ctrl->bit_width) /* Bit Width of 8 bits*/
|
|
|
+ {
|
|
|
+ ((uint8_t *) (p_ctrl->p_rx_data))[rx_count] = p_ctrl->p_regs->SPDR_BY;
|
|
|
+ }
|
|
|
+ else /* Bit Widths of 9, 10, 11, 12, 13, 14, 15 or 16 bits */
|
|
|
+ {
|
|
|
+ ((uint16_t *) (p_ctrl->p_rx_data))[rx_count] = p_ctrl->p_regs->SPDR_HA;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ p_ctrl->rx_count = rx_count + 1;
|
|
|
+}
|
|
|
+
|
|
|
+/*******************************************************************************************************************//**
|
|
|
+ * Copy configured bit width from the current tx data location into the SPI data register.
|
|
|
+ * If the transmit buffer is NULL, than write zero to the SPI data register.
|
|
|
+ * If the total transfer length has already been transmitted than do nothing.
|
|
|
+ *
|
|
|
+ * @param[in] p_ctrl pointer to control structure.
|
|
|
+ **********************************************************************************************************************/
|
|
|
+static void r_spi_transmit (spi_instance_ctrl_t * p_ctrl)
|
|
|
+{
|
|
|
+ uint32_t tx_count = p_ctrl->tx_count;
|
|
|
+ if (tx_count == p_ctrl->count)
|
|
|
+ {
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (0 == p_ctrl->p_tx_data)
|
|
|
+ {
|
|
|
+ /* Transmit zero if no tx buffer present. */
|
|
|
+ p_ctrl->p_regs->SPDR = 0;
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ if (SPI_BIT_WIDTH_16_BITS < p_ctrl->bit_width) /* Bit Widths of 20, 24 or 32 bits */
|
|
|
+ {
|
|
|
+ p_ctrl->p_regs->SPDR = ((uint32_t *) p_ctrl->p_tx_data)[tx_count];
|
|
|
+ }
|
|
|
+ else if (SPI_BIT_WIDTH_8_BITS >= p_ctrl->bit_width) /* Bit Width of 8 bits*/
|
|
|
+ {
|
|
|
+ p_ctrl->p_regs->SPDR_BY = ((uint8_t *) p_ctrl->p_tx_data)[tx_count];
|
|
|
+ }
|
|
|
+ else /* Bit Widths of 9, 10, 11, 12, 13, 14, 15 or 16 bits */
|
|
|
+ {
|
|
|
+ p_ctrl->p_regs->SPDR_HA = ((uint16_t *) p_ctrl->p_tx_data)[tx_count];
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ p_ctrl->tx_count = tx_count + 1;
|
|
|
+}
|
|
|
+
|
|
|
+/*******************************************************************************************************************//**
|
|
|
+ * Calls user callback.
|
|
|
+ *
|
|
|
+ * @param[in] p_ctrl Pointer to SPI instance control block
|
|
|
+ * @param[in] event Event code
|
|
|
+ **********************************************************************************************************************/
|
|
|
+static void r_spi_call_callback (spi_instance_ctrl_t * p_ctrl, spi_event_t event)
|
|
|
+{
|
|
|
+ spi_callback_args_t args;
|
|
|
+
|
|
|
+ /* Store callback arguments in memory provided by user if available. This allows callback arguments to be
|
|
|
+ * stored in non-secure memory so they can be accessed by a non-secure callback function. */
|
|
|
+ spi_callback_args_t * p_args = p_ctrl->p_callback_memory;
|
|
|
+ if (NULL == p_args)
|
|
|
+ {
|
|
|
+ /* Store on stack */
|
|
|
+ p_args = &args;
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ /* Save current arguments on the stack in case this is a nested interrupt. */
|
|
|
+ args = *p_args;
|
|
|
+ }
|
|
|
+
|
|
|
+ p_args->channel = p_ctrl->p_cfg->channel;
|
|
|
+ p_args->event = event;
|
|
|
+ p_args->p_context = p_ctrl->p_context;
|
|
|
+
|
|
|
+#if BSP_TZ_SECURE_BUILD
|
|
|
+
|
|
|
+ /* p_callback can point to a secure function or a non-secure function. */
|
|
|
+ if (!cmse_is_nsfptr(p_ctrl->p_callback))
|
|
|
+ {
|
|
|
+ /* If p_callback is secure, then the project does not need to change security state. */
|
|
|
+ p_ctrl->p_callback(p_args);
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ /* If p_callback is Non-secure, then the project must change to Non-secure state in order to call the callback. */
|
|
|
+ spi_prv_ns_callback p_callback = (spi_prv_ns_callback) (p_ctrl->p_callback);
|
|
|
+ p_callback(p_args);
|
|
|
+ }
|
|
|
+
|
|
|
+#else
|
|
|
+
|
|
|
+ /* If the project is not Trustzone Secure, then it will never need to change security state in order to call the callback. */
|
|
|
+ p_ctrl->p_callback(p_args);
|
|
|
+#endif
|
|
|
+ if (NULL != p_ctrl->p_callback_memory)
|
|
|
+ {
|
|
|
+ /* Restore callback memory in case this is a nested interrupt. */
|
|
|
+ *p_ctrl->p_callback_memory = args;
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+/*******************************************************************************************************************//**
|
|
|
+ * ISR called when data is loaded into SPI data register from the shift register.
|
|
|
+ **********************************************************************************************************************/
|
|
|
+void spi_rxi_isr (void)
|
|
|
+{
|
|
|
+ /* Save context if RTOS is used */
|
|
|
+ FSP_CONTEXT_SAVE;
|
|
|
+
|
|
|
+ IRQn_Type irq = R_FSP_CurrentIrqGet();
|
|
|
+ R_BSP_IrqStatusClear(irq);
|
|
|
+
|
|
|
+ spi_instance_ctrl_t * p_ctrl = (spi_instance_ctrl_t *) R_FSP_IsrContextGet(irq);
|
|
|
+
|
|
|
+ r_spi_receive(p_ctrl);
|
|
|
+
|
|
|
+#if SPI_TRANSMIT_FROM_RXI_ISR == 1
|
|
|
+
|
|
|
+ /* It is a little faster to handle the transmit buffer empty event in the receive buffer full ISR.
|
|
|
+ * Note that this is only possible when the instance is not using a transfer instance to receive data. */
|
|
|
+ r_spi_transmit(p_ctrl);
|
|
|
+#endif
|
|
|
+
|
|
|
+ if (p_ctrl->rx_count == p_ctrl->count)
|
|
|
+ {
|
|
|
+ /* If the transmit and receive ISRs are too slow to keep up at high bitrates,
|
|
|
+ * the hardware will generate an interrupt before all of the transfers are completed.
|
|
|
+ * By enabling the transfer end ISR here, all of the transfers are guaranteed to be completed. */
|
|
|
+ R_BSP_IrqEnableNoClear(p_ctrl->p_cfg->tei_irq);
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Restore context if RTOS is used */
|
|
|
+ FSP_CONTEXT_RESTORE;
|
|
|
+}
|
|
|
+
|
|
|
+/*******************************************************************************************************************//**
|
|
|
+ * ISR called when data is copied from the SPI data register into the SPI shift register.
|
|
|
+ **********************************************************************************************************************/
|
|
|
+void spi_txi_isr (void)
|
|
|
+{
|
|
|
+ /* Save context if RTOS is used */
|
|
|
+ FSP_CONTEXT_SAVE;
|
|
|
+
|
|
|
+ IRQn_Type irq = R_FSP_CurrentIrqGet();
|
|
|
+ R_BSP_IrqStatusClear(irq);
|
|
|
+
|
|
|
+#if SPI_TRANSMIT_FROM_RXI_ISR == 0
|
|
|
+ spi_instance_ctrl_t * p_ctrl = (spi_instance_ctrl_t *) R_FSP_IsrContextGet(irq);
|
|
|
+
|
|
|
+ spi_extended_cfg_t * p_extend = ((spi_extended_cfg_t *) p_ctrl->p_cfg->p_extend);
|
|
|
+ if (p_extend && (SPI_COMMUNICATION_TRANSMIT_ONLY == p_extend->spi_comm))
|
|
|
+ {
|
|
|
+ /* Only enable the transfer end ISR if there are no receive buffer full interrupts expected to be handled
|
|
|
+ * after this interrupt. */
|
|
|
+ if (p_ctrl->tx_count == p_ctrl->count - 1)
|
|
|
+ {
|
|
|
+ /* If the transmit and receive ISRs are too slow to keep up at high bitrates,
|
|
|
+ * the hardware will generate an interrupt before all of the transfers are completed.
|
|
|
+ * By enabling the transfer end ISR here, all of the transfers are guaranteed to be completed. */
|
|
|
+ R_BSP_IrqEnable(p_ctrl->p_cfg->tei_irq);
|
|
|
+ }
|
|
|
+ else if (p_ctrl->p_cfg->p_transfer_tx)
|
|
|
+ {
|
|
|
+ /* If DMA is used to transmit data, enable the interrupt after all the data has been transfered, but do not
|
|
|
+ * clear the IRQ Pending Bit. */
|
|
|
+ R_BSP_IrqEnableNoClear(p_ctrl->p_cfg->tei_irq);
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Transmit happens after checking if the last transfer has been written to the transmit buffer in order
|
|
|
+ * to ensure that the end interrupt is not enabled while there is data still in the transmit buffer. */
|
|
|
+ r_spi_transmit(p_ctrl);
|
|
|
+#endif
|
|
|
+
|
|
|
+ /* Restore context if RTOS is used */
|
|
|
+ FSP_CONTEXT_RESTORE;
|
|
|
+}
|
|
|
+
|
|
|
+/*******************************************************************************************************************//**
|
|
|
+ * ISR called when the SPI peripheral transitions from the transferring state to the IDLE state.
|
|
|
+ **********************************************************************************************************************/
|
|
|
+void spi_tei_isr (void)
|
|
|
+{
|
|
|
+ /* Save context if RTOS is used */
|
|
|
+ FSP_CONTEXT_SAVE;
|
|
|
+
|
|
|
+ IRQn_Type irq = R_FSP_CurrentIrqGet();
|
|
|
+ R_BSP_IrqStatusClear(irq);
|
|
|
+
|
|
|
+ spi_instance_ctrl_t * p_ctrl = (spi_instance_ctrl_t *) R_FSP_IsrContextGet(irq);
|
|
|
+
|
|
|
+ if ((0 == p_ctrl->p_regs->SPSR_b.IDLNF) || (SPI_MODE_SLAVE == p_ctrl->p_cfg->operating_mode))
|
|
|
+ {
|
|
|
+ R_BSP_IrqDisable(irq);
|
|
|
+
|
|
|
+ /* Disable the SPI Transfer. */
|
|
|
+ p_ctrl->p_regs->SPCR_b.SPE = 0;
|
|
|
+
|
|
|
+ /* Signal that a transfer has completed. */
|
|
|
+ r_spi_call_callback(p_ctrl, SPI_EVENT_TRANSFER_COMPLETE);
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Restore context if RTOS is used */
|
|
|
+ FSP_CONTEXT_RESTORE;
|
|
|
+}
|
|
|
+
|
|
|
+/*******************************************************************************************************************//**
|
|
|
+ * ISR called in the event that an error occurs (Ex: RX_OVERFLOW).
|
|
|
+ **********************************************************************************************************************/
|
|
|
+void spi_eri_isr (void)
|
|
|
+{
|
|
|
+ /* Save context if RTOS is used */
|
|
|
+ FSP_CONTEXT_SAVE;
|
|
|
+
|
|
|
+ IRQn_Type irq = R_FSP_CurrentIrqGet();
|
|
|
+ spi_instance_ctrl_t * p_ctrl = (spi_instance_ctrl_t *) R_FSP_IsrContextGet(irq);
|
|
|
+
|
|
|
+ /* Disable the SPI Transfer. */
|
|
|
+ p_ctrl->p_regs->SPCR_b.SPE = 0;
|
|
|
+
|
|
|
+ /* Read the status register. */
|
|
|
+ uint8_t status = p_ctrl->p_regs->SPSR;
|
|
|
+
|
|
|
+ /* Clear the status register. */
|
|
|
+ p_ctrl->p_regs->SPSR = 0;
|
|
|
+
|
|
|
+ /* Check if the error is a Parity Error. */
|
|
|
+ if (R_SPI0_SPSR_PERF_Msk & status)
|
|
|
+ {
|
|
|
+ r_spi_call_callback(p_ctrl, SPI_EVENT_ERR_PARITY);
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Check if the error is a Receive Buffer Overflow Error. */
|
|
|
+ if (R_SPI0_SPSR_OVRF_Msk & status)
|
|
|
+ {
|
|
|
+ r_spi_call_callback(p_ctrl, SPI_EVENT_ERR_READ_OVERFLOW);
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Check if the error is a Mode Fault Error. */
|
|
|
+ if (R_SPI0_SPSR_MODF_Msk & status)
|
|
|
+ {
|
|
|
+ /* Check if the error is a Transmit Buffer Underflow Error. */
|
|
|
+ if (R_SPI0_SPSR_UDRF_Msk & status)
|
|
|
+ {
|
|
|
+ r_spi_call_callback(p_ctrl, SPI_EVENT_ERR_MODE_UNDERRUN);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ R_BSP_IrqStatusClear(irq);
|
|
|
+
|
|
|
+ /* Restore context if RTOS is used */
|
|
|
+ FSP_CONTEXT_RESTORE;
|
|
|
+}
|
|
|
+
|
|
|
+/* End of file R_SPI. */
|