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- /*************************************************************************//**
- * @file dmdif_ssd2119_ebi.c
- * @brief Dot matrix display SSD2119 interface using EBI
- * @author Energy Micro AS
- ******************************************************************************
- * @section License
- * <b>(C) Copyright 2012 Energy Micro AS, http://www.energymicro.com</b>
- ******************************************************************************
- *
- * Permission is granted to anyone to use this software for any purpose,
- * including commercial applications, and to alter it and redistribute it
- * freely, subject to the following restrictions:
- *
- * 1. The origin of this software must not be misrepresented; you must not
- * claim that you wrote the original software.
- * 2. Altered source versions must be plainly marked as such, and must not be
- * misrepresented as being the original software.
- * 3. This notice may not be removed or altered from any source distribution.
- * 4. The source and compiled code may only be used on Energy Micro "EFM32"
- * microcontrollers and "EFR4" radios.
- *
- * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Energy Micro AS has no
- * obligation to support this Software. Energy Micro AS is providing the
- * Software "AS IS", with no express or implied warranties of any kind,
- * including, but not limited to, any implied warranties of merchantability
- * or fitness for any particular purpose or warranties against infringement
- * of any proprietary rights of a third party.
- *
- * Energy Micro AS will not be liable for any consequential, incidental, or
- * special damages, or any other relief, or for any claim by any third party,
- * arising from your use of this Software.
- *
- *****************************************************************************/
- #include <stdint.h>
- #include "dmd_ssd2119_registers.h"
- #include "dmd_ssd2119.h"
- #include "dmdif_ssd2119_spi.h"
- #include "dvk.h"
- /* Local function prototypes */
- static EMSTATUS setNextReg(uint8_t reg);
- static uint32_t command_register;
- static uint32_t data_register;
- /**************************************************************************//**
- * @brief
- * Initializes the data interface to the LCD controller SSD2119
- *
- *
- * @param cmdRegAddr
- * The address in memory where data to the command register in the display
- * controller are written
- * @param dataRegAddr
- * The address in memory where data to the data register in the display
- * controller are written
- *
- * @return
- * DMD_OK on success, otherwise error code
- ******************************************************************************/
- EMSTATUS DMDIF_init(uint32_t cmdRegAddr, uint32_t dataRegAddr)
- {
- command_register = cmdRegAddr;
- data_register = dataRegAddr;
- DVK_displayControl(DVK_Display_SPI);
- return DMD_OK;
- }
- /**************************************************************************//**
- * @brief
- * Writes a value to a control register in the LCD controller
- *
- * @param reg
- * The register that will be written to
- * @param data
- * The value to write to the register
- *
- * @return
- * DMD_OK on success, otherwise error code
- ******************************************************************************/
- EMSTATUS DMDIF_writeReg(uint8_t reg, uint16_t data)
- {
- setNextReg(reg);
- /* Write bits [15:8] of the data to bits [8:1] of the output lines */
- DVK_writeRegister( (uint16_t *) data_register, ((data & 0xff00) >> 8) << 1);
- /* Write bits [7:0] of the data to bits [8:1] of the output lines */
- DVK_writeRegister( (uint16_t *) data_register, (data & 0x00ff) << 1);
- return DMD_OK;
- }
- /**************************************************************************//**
- * @brief
- * Reads the device code of the LCD controller
- * DOESN'T WORK
- *
- * @return
- * The device code of the LCD controller
- ******************************************************************************/
- uint16_t DMDIF_readDeviceCode(void)
- {
- uint16_t readData;
- uint16_t deviceCode;
- /* Reading from the oscillation control register gives the device code */
- setNextReg(DMD_SSD2119_DEVICE_CODE_READ);
- readData = DVK_readRegister( (uint16_t *) data_register );
- deviceCode = ((readData >> 1) & 0x00ff) << 8;
- readData = DVK_readRegister( (uint16_t *) data_register );
- deviceCode |= ((readData >> 1) & 0x00ff);
- return deviceCode;
- }
- /**************************************************************************//**
- * @brief
- * Sends the data access command to the LCD controller to prepare for one or more
- * writes or reads using the DMDIF_writeData() and DMDIF_readData()
- *
- * @return
- * DMD_OK on success, otherwise error code
- ******************************************************************************/
- EMSTATUS DMDIF_prepareDataAccess(void)
- {
- setNextReg(DMD_SSD2119_ACCESS_DATA);
- return DMD_OK;
- }
- /**************************************************************************//**
- * @brief
- * Writes one pixel to the LCD controller. DMDIF_prepareDataAccess() needs to be
- * called before writing data using this function.
- *
- * @param data
- * The color value of the pixel to be written in 18bpp format
- *
- * @return
- * DMD_OK on success, otherwise error code
- ******************************************************************************/
- EMSTATUS DMDIF_writeData(uint32_t data)
- {
- /* Write bits [17:9] of the pixel data to bits [8:0] on the output lines */
- DVK_writeRegister( (uint16_t *) data_register, (data & 0x0003FE00) >> 9);
- /* Write bits [8:0] of the pixel data to bits [8:0] on the output lines */
- DVK_writeRegister( (uint16_t *) data_register, (data & 0x000001FF));
- return DMD_OK;
- }
- /**************************************************************************//**
- * @brief
- * Reads a byte of data from the memory of the LCD controller.
- * DMDIF_prepareDataAccess() needs to be called before using this function.
- * DOESN'T WORK
- *
- * @return
- * 18bpp value of pixel
- ******************************************************************************/
- uint32_t DMDIF_readData(void)
- {
- uint32_t data;
- /* Read bits [17:9] of the pixel */
- data = DVK__readRegister( (uint16_t *) data_register ) << 9;
- /* Read bits [8:0] of the pixel */
- data |= DVK_readRegister( (uint16_t *) data_register );
- return data;
- }
- /**************************************************************************//**
- * \brief
- * Sets the register in the LCD controller to write commands to
- *
- * \param reg
- * The next register in the LCD controller to write to
- *
- * @return
- * DMD_OK on success, otherwise error code
- ******************************************************************************/
- static EMSTATUS setNextReg(uint8_t reg)
- {
- uint16_t data;
- data = ((uint16_t) reg) << 1;
- /* First 9 bits is 0 */
- DVK_writeRegister( (uint16_t *) command_register, 0 );
- /* Write the register address to bits [8:1] in the index register */
- DVK_writeRegister( (uint16_t *) command_register, data );
- return DMD_OK;
- }
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