rt-thread/bsp/Infineon/libraries/HAL_Drivers/drv_spi.c

/*
 * Copyright (c) 2006-2023, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2022-07-18     Rbb666       first version
 * 2023-03-30     Rbb666       update spi driver
 */

#include <drv_spi.h>

#ifdef RT_USING_SPI

//#define DRV_DEBUG
#define DBG_TAG              "drv.spi"
#ifdef DRV_DEBUG
    #define DBG_LVL               DBG_LOG
#else
    #define DBG_LVL               DBG_INFO
#endif /* DRV_DEBUG */
#include <rtdbg.h>

#ifdef BSP_USING_SPI0
    static struct rt_spi_bus spi_bus0;
#endif
#ifdef BSP_USING_SPI3
    static struct rt_spi_bus spi_bus3;
#endif
#ifdef BSP_USING_SPI6
    static struct rt_spi_bus spi_bus6;
#endif

static struct ifx_spi_handle spi_bus_obj[] =
{
#if defined(BSP_USING_SPI0)
    {
        .bus_name = "spi0",
        .sck_pin = GET_PIN(0, 4),
        .miso_pin = GET_PIN(0, 3),
        .mosi_pin = GET_PIN(0, 2),
    },
#endif
#if defined(BSP_USING_SPI3)
    {
        .bus_name = "spi3",
        .sck_pin = GET_PIN(6, 2),
        .miso_pin = GET_PIN(6, 1),
        .mosi_pin = GET_PIN(6, 0),
    },
#endif
#if defined(BSP_USING_SPI6)
    {
        .bus_name = "spi6",
        .sck_pin = GET_PIN(12, 2),
        .miso_pin = GET_PIN(12, 1),
        .mosi_pin = GET_PIN(12, 0),
    },
#endif
};

static struct ifx_spi spi_config[sizeof(spi_bus_obj) / sizeof(spi_bus_obj[0])] = {0};

/* private rt-thread spi ops function */
static rt_err_t spi_configure(struct rt_spi_device *device, struct rt_spi_configuration *configuration);
static rt_ssize_t spixfer(struct rt_spi_device *device, struct rt_spi_message *message);

static struct rt_spi_ops ifx_spi_ops =
{
    .configure = spi_configure,
    .xfer = spixfer,
};

static void spi_interrupt_callback(void *arg, cyhal_spi_event_t event)
{
    struct ifx_spi *spi_drv = (struct ifx_spi *)arg;

    rt_interrupt_enter();

    if ((event & CYHAL_SPI_IRQ_DONE) != 0u)
    {
        /* Transmission is complete. Handle Event */
        rt_completion_done(&spi_drv->cpt);
    }

    rt_interrupt_leave();
}

static void ifx_spi_init(struct ifx_spi *spi_device)
{
    RT_ASSERT(spi_device != RT_NULL);

    rt_err_t result = RT_EOK;

    result = cyhal_spi_init(spi_device->spi_handle_t->spi_obj, spi_device->spi_handle_t->mosi_pin, spi_device->spi_handle_t->miso_pin,
                            spi_device->spi_handle_t->sck_pin, NC, NULL, spi_device->spi_handle_t->spi_obj->data_bits,
                            spi_device->spi_handle_t->spi_obj->mode, false);

    if (result != RT_EOK)
    {
        LOG_E("spi%s init fail", spi_device->spi_handle_t->bus_name);
        return;
    }

    LOG_I("[%s] freq:[%d]HZ\n", spi_device->spi_handle_t->bus_name, spi_device->spi_handle_t->freq);

    result = cyhal_spi_set_frequency(spi_device->spi_handle_t->spi_obj, spi_device->spi_handle_t->freq);
    if (result == CYHAL_SPI_RSLT_CLOCK_ERROR)
    {
        LOG_E("%s set frequency fail", spi_device->spi_handle_t->bus_name);
        return;
    }

    /* Register a callback function to be called when the interrupt fires */
    cyhal_spi_register_callback(spi_device->spi_handle_t->spi_obj, spi_interrupt_callback, spi_device);

    /* Enable the events that will trigger the call back function */
    cyhal_spi_enable_event(spi_device->spi_handle_t->spi_obj, CYHAL_SPI_IRQ_DONE, 4, true);
}

static rt_err_t spi_configure(struct rt_spi_device *device,
                              struct rt_spi_configuration *configuration)
{
    RT_ASSERT(device != RT_NULL);
    RT_ASSERT(configuration != RT_NULL);

    struct ifx_spi *spi_device = rt_container_of(device->bus, struct ifx_spi, spi_bus);

    /* data_width */
    if (configuration->data_width <= 8)
    {
        spi_device->spi_handle_t->spi_obj->data_bits = 8;
    }
    else if (configuration->data_width <= 16)
    {
        spi_device->spi_handle_t->spi_obj->data_bits = 16;
    }
    else
    {
        return -RT_EIO;
    }

    uint32_t max_hz;
    max_hz = configuration->max_hz;
    spi_device->spi_handle_t->freq = max_hz;

    /* MSB or LSB */
    switch (configuration->mode & RT_SPI_MODE_3)
    {
    case RT_SPI_MODE_0:
        spi_device->spi_handle_t->spi_obj->mode = CYHAL_SPI_MODE_00_MSB;
        break;

    case RT_SPI_MODE_1:
        spi_device->spi_handle_t->spi_obj->mode = CYHAL_SPI_MODE_01_MSB;
        break;

    case RT_SPI_MODE_2:
        spi_device->spi_handle_t->spi_obj->mode = CYHAL_SPI_MODE_10_MSB;
        break;

    case RT_SPI_MODE_3:
        spi_device->spi_handle_t->spi_obj->mode = CYHAL_SPI_MODE_11_MSB;
        break;
    }

    ifx_spi_init(spi_device);

    return RT_EOK;
}

static rt_ssize_t spixfer(struct rt_spi_device *device, struct rt_spi_message *message)
{
    RT_ASSERT(device != NULL);
    RT_ASSERT(message != NULL);

    struct ifx_spi *spi_device = rt_container_of(device->bus, struct ifx_spi, spi_bus);

    /* take CS */
    if (message->cs_take && !(device->config.mode & RT_SPI_NO_CS) && (device->cs_pin != PIN_NONE))
    {
        if (device->config.mode & RT_SPI_CS_HIGH)
        {
            cyhal_gpio_write(device->cs_pin, PIN_HIGH);
        }
        else
        {
            cyhal_gpio_write(device->cs_pin, PIN_LOW);
        }
        LOG_D("spi take cs\n");
    }

    int result = RT_EOK;

    if (message->length > 0)
    {
        if (message->send_buf == RT_NULL && message->recv_buf != RT_NULL)
        {
            /**< receive message */
            result = cyhal_spi_transfer(spi_device->spi_handle_t->spi_obj, RT_NULL, 0x00, message->recv_buf, message->length, 0x00);
        }
        else if (message->send_buf != RT_NULL && message->recv_buf == RT_NULL)
        {
            /**< send message */
            result = cyhal_spi_transfer(spi_device->spi_handle_t->spi_obj, message->send_buf, message->length, RT_NULL, 0x00, 0x00);
        }
        else if (message->send_buf != RT_NULL && message->recv_buf != RT_NULL)
        {
            /**< send and receive message */
            result = cyhal_spi_transfer(spi_device->spi_handle_t->spi_obj, message->send_buf, message->length, message->recv_buf, message->length, 0x00);
        }

        /* blocking the thread,and the other tasks can run */
        rt_completion_wait(&spi_device->cpt, RT_WAITING_FOREVER);
    }

    if (message->cs_release && !(device->config.mode & RT_SPI_NO_CS) && (device->cs_pin != PIN_NONE))
    {
        if (device->config.mode & RT_SPI_CS_HIGH)
            cyhal_gpio_write(device->cs_pin, PIN_LOW);
        else
            cyhal_gpio_write(device->cs_pin, PIN_HIGH);
    }

    return message->length;
}

/**
  * Attach the spi device to SPI bus, this function must be used after initialization.
  */
rt_err_t rt_hw_spi_device_attach(const char *bus_name, const char *device_name, rt_base_t cs_pin)
{
    RT_ASSERT(bus_name != RT_NULL);
    RT_ASSERT(device_name != RT_NULL);

    rt_err_t result;
    struct rt_spi_device *spi_device;

    /* attach the device to spi bus*/
    spi_device = (struct rt_spi_device *)rt_malloc(sizeof(struct rt_spi_device));
    RT_ASSERT(spi_device != RT_NULL);

    result = rt_spi_bus_attach_device_cspin(spi_device, device_name, bus_name, cs_pin, RT_NULL);
    if (result != RT_EOK)
    {
        LOG_E("%s attach to %s faild, %d\n", device_name, bus_name, result);
    }

    RT_ASSERT(result == RT_EOK);

    LOG_D("%s attach to %s done", device_name, bus_name);

    return result;
}

int rt_hw_spi_init(void)
{
    int result = RT_EOK;

    for (int spi_index = 0; spi_index < sizeof(spi_bus_obj) / sizeof(spi_bus_obj[0]); spi_index++)
    {
        spi_bus_obj[spi_index].spi_obj = rt_malloc(sizeof(cyhal_spi_t));
        RT_ASSERT(spi_bus_obj[spi_index].spi_obj != RT_NULL);

        spi_config[spi_index].spi_handle_t = &spi_bus_obj[spi_index];

        rt_err_t err = rt_spi_bus_register(&spi_config[spi_index].spi_bus, spi_bus_obj[spi_index].bus_name, &ifx_spi_ops);
        if (RT_EOK != err)
        {
            LOG_E("%s bus register failed.", spi_config[spi_index].spi_handle_t->bus_name);
            return -RT_ERROR;
        }

        LOG_D("MOSI PIN:[%d], MISO PIN[%d], CLK PIN[%d]\n",
              spi_bus_obj[spi_index].mosi_pin, spi_bus_obj[spi_index].miso_pin,
              spi_bus_obj[spi_index].sck_pin);

        /* initialize completion object */
        rt_completion_init(&spi_config[spi_index].cpt);
    }

    return result;
}
INIT_BOARD_EXPORT(rt_hw_spi_init);
#endif /* RT_USING_SPI */