SPI

STM32H7开发板上使用SPI设备，SCK总线在发送数据完毕后不能及时拉高

发布于 2022-03-14 09:23:56 浏览：1454 订阅该版

3 个回答

StackYuan 认证专家 2022-03-14

这家伙很懒，什么也没写！

红枫认证专家 2022-03-14

这家伙很懒，什么也没写！

anning865 2022-03-14

这家伙很懒，什么也没写！

红枫 2022-03-15

这家伙很懒，什么也没写！

H7的spi驱动初始化函数, 看看是否有差异:

```c
static rt_err_t stm32_spi_init(struct stm32_spi *spi_drv, struct rt_spi_configuration *cfg)
{
    RT_ASSERT(spi_drv != RT_NULL);
    RT_ASSERT(cfg != RT_NULL);

SPI_HandleTypeDef *spi_handle = &spi_drv->handle;

if (cfg->mode & RT_SPI_SLAVE)
    {
        spi_handle->Init.Mode = SPI_MODE_SLAVE;
    }
    else
    {
        spi_handle->Init.Mode = SPI_MODE_MASTER;
    }

if (cfg->mode & RT_SPI_3WIRE)
    {
        spi_handle->Init.Direction = SPI_DIRECTION_1LINE;
    }
    else
    {
        spi_handle->Init.Direction = SPI_DIRECTION_2LINES;
    }

if (cfg->data_width == 8)
    {
        spi_handle->Init.DataSize = SPI_DATASIZE_8BIT;
        spi_handle->TxXferSize = 8;
        spi_handle->RxXferSize = 8;
    }
    else if (cfg->data_width == 16)
    {
        spi_handle->Init.DataSize = SPI_DATASIZE_16BIT;
    }
    else
    {
        return RT_EIO;
    }

if (cfg->mode & RT_SPI_CPHA)
    {
        spi_handle->Init.CLKPhase = SPI_PHASE_2EDGE;
    }
    else
    {
        spi_handle->Init.CLKPhase = SPI_PHASE_1EDGE;
    }

if (cfg->mode & RT_SPI_CPOL)
    {
        spi_handle->Init.CLKPolarity = SPI_POLARITY_HIGH;
    }
    else
    {
        spi_handle->Init.CLKPolarity = SPI_POLARITY_LOW;
    }

if (cfg->mode & RT_SPI_NO_CS)
    {
        spi_handle->Init.NSS = SPI_NSS_SOFT;
    }
    else
    {
        spi_handle->Init.NSS = SPI_NSS_SOFT;
    }

uint32_t SPI_APB_CLOCK;

#if defined(SOC_SERIES_STM32F0) || defined(SOC_SERIES_STM32G0)
    SPI_APB_CLOCK = HAL_RCC_GetPCLK1Freq();
#elif defined(SOC_SERIES_STM32H7)
    SPI_APB_CLOCK = HAL_RCC_GetSysClockFreq();
#else
    SPI_APB_CLOCK = HAL_RCC_GetPCLK2Freq();
#endif

if (cfg->max_hz >= SPI_APB_CLOCK / 2)
    {
        spi_handle->Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_2;
    }
    else if (cfg->max_hz >= SPI_APB_CLOCK / 4)
    {
        spi_handle->Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_4;
    }
    else if (cfg->max_hz >= SPI_APB_CLOCK / 8)
    {
        spi_handle->Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_8;
    }
    else if (cfg->max_hz >= SPI_APB_CLOCK / 16)
    {
        spi_handle->Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_16;
    }
    else if (cfg->max_hz >= SPI_APB_CLOCK / 32)
    {
        spi_handle->Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_32;
    }
    else if (cfg->max_hz >= SPI_APB_CLOCK / 64)
    {
        spi_handle->Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_64;
    }
    else if (cfg->max_hz >= SPI_APB_CLOCK / 128)
    {
        spi_handle->Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_128;
    }
    else
    {
        /*  min prescaler 256 */
        spi_handle->Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_256;
    }

LOG_D("sys freq: %d, pclk2 freq: %d, SPI limiting freq: %d, BaudRatePrescaler: %d",
          HAL_RCC_GetSysClockFreq(),
          SPI_APB_CLOCK,
          cfg->max_hz,
          spi_handle->Init.BaudRatePrescaler);

if (cfg->mode & RT_SPI_MSB)
    {
        spi_handle->Init.FirstBit = SPI_FIRSTBIT_MSB;
    }
    else
    {
        spi_handle->Init.FirstBit = SPI_FIRSTBIT_LSB;
    }

spi_handle->Init.TIMode = SPI_TIMODE_DISABLE;
    spi_handle->Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
    spi_handle->State = HAL_SPI_STATE_RESET;
#if defined(SOC_SERIES_STM32L4) || defined(SOC_SERIES_STM32G0) || defined(SOC_SERIES_STM32F0)
    spi_handle->Init.NSSPMode          = SPI_NSS_PULSE_DISABLE;
#elif defined(SOC_SERIES_STM32H7)
    spi_handle->Init.Mode                       = SPI_MODE_MASTER;
    spi_handle->Init.NSS                        = SPI_NSS_SOFT;
    spi_handle->Init.NSSPMode                   = SPI_NSS_PULSE_DISABLE;
    spi_handle->Init.NSSPolarity                = SPI_NSS_POLARITY_LOW;
    spi_handle->Init.CRCPolynomial              = 7;
    spi_handle->Init.TxCRCInitializationPattern = SPI_CRC_INITIALIZATION_ALL_ZERO_PATTERN;
    spi_handle->Init.RxCRCInitializationPattern = SPI_CRC_INITIALIZATION_ALL_ZERO_PATTERN;
    spi_handle->Init.MasterSSIdleness           = SPI_MASTER_SS_IDLENESS_00CYCLE;
    spi_handle->Init.MasterInterDataIdleness    = SPI_MASTER_INTERDATA_IDLENESS_00CYCLE;
    spi_handle->Init.MasterReceiverAutoSusp     = SPI_MASTER_RX_AUTOSUSP_DISABLE;
    spi_handle->Init.MasterKeepIOState          = SPI_MASTER_KEEP_IO_STATE_ENABLE;
    spi_handle->Init.IOSwap                     = SPI_IO_SWAP_DISABLE;
    spi_handle->Init.FifoThreshold              = SPI_FIFO_THRESHOLD_01DATA;
#endif

if (HAL_SPI_Init(spi_handle) != HAL_OK)
    {
        return RT_EIO;
    }

#if defined(SOC_SERIES_STM32L4) || defined(SOC_SERIES_STM32F0) \
        || defined(SOC_SERIES_STM32F7) || defined(SOC_SERIES_STM32G0)
    SET_BIT(spi_handle->Instance->CR2, SPI_RXFIFO_THRESHOLD_HF);
#endif

/* DMA configuration */
    if (spi_drv->spi_dma_flag & SPI_USING_RX_DMA_FLAG)
    {
        HAL_DMA_Init(&spi_drv->dma.handle_rx);

__HAL_LINKDMA(&spi_drv->handle, hdmarx, spi_drv->dma.handle_rx);

/* NVIC configuration for DMA transfer complete interrupt */
        HAL_NVIC_SetPriority(spi_drv->config->dma_rx->dma_irq, 0, 0);
        HAL_NVIC_EnableIRQ(spi_drv->config->dma_rx->dma_irq);
    }

if (spi_drv->spi_dma_flag & SPI_USING_TX_DMA_FLAG)
    {
        HAL_DMA_Init(&spi_drv->dma.handle_tx);

__HAL_LINKDMA(&spi_drv->handle, hdmatx, spi_drv->dma.handle_tx);

/* NVIC configuration for DMA transfer complete interrupt */
        HAL_NVIC_SetPriority(spi_drv->config->dma_tx->dma_irq, 0, 1);
        HAL_NVIC_EnableIRQ(spi_drv->config->dma_tx->dma_irq);
    }

__HAL_SPI_ENABLE(spi_handle);

LOG_D("%s init done", spi_drv->config->bus_name);
    return RT_EOK;
}
```