Question
HAL_SD using DMA trigger the HAL_SD_RxCpltCallback() but not the HAL_SD_TxCpltCallback()?
I have setup the HAL_SD system to perform DMA transfers, the SD card can be read from but it fails to write.
The program just hangs in a while loop waiting for WaitStatus to equal 1, but the interrupt that sets it to 1 is never called. It's running on an STM32L452RE.
My problem is like this: https://community.st.com/s/question/0D50X00009XkWO5/getting-sdmmc-to-work-with-dma2-channel-4
Only 1 DMA channel is assigned but, it can only receive not transmit?
Here is the DMA setup:
__HAL_RCC_GPIOD_CLK_ENABLE();
__HAL_RCC_GPIOC_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();
__HAL_RCC_DMA2_CLK_ENABLE();
__HAL_RCC_SDMMC1_CLK_ENABLE();
/**SDMMC1 GPIO Configuration
PD2 ------> SDMMC1_CMD
PC11 ------> SDMMC1_D3
PC10 ------> SDMMC1_D2
PC12 ------> SDMMC1_CK
PC9 ------> SDMMC1_D1
PC8 ------> SDMMC1_D0
*/
GPIO_InitStruct.Pin = GPIO_PIN_2;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF12_SDMMC1;
HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
GPIO_InitStruct.Pin = GPIO_PIN_11 | GPIO_PIN_10 | GPIO_PIN_12 | GPIO_PIN_9
| GPIO_PIN_8;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF12_SDMMC1;
HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
/* SDMMC1 DMA Init */
/* SDMMC1 Init */
hdma_sdmmc1.Instance = DMA2_Channel4;
hdma_sdmmc1.Init.Request = DMA_REQUEST_7;
hdma_sdmmc1.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_sdmmc1.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_sdmmc1.Init.MemInc = DMA_MINC_ENABLE;
hdma_sdmmc1.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
hdma_sdmmc1.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
hdma_sdmmc1.Init.Mode = DMA_NORMAL;
hdma_sdmmc1.Init.Priority = DMA_PRIORITY_LOW;
if (HAL_DMA_Init(&hdma_sdmmc1) != HAL_OK)
{
Error_Handler();
}
/* Several peripheral DMA handle pointers point to the same DMA handle.
Be aware that there is only one channel to perform all the requested DMAs. */
/* Be sure to change transfer direction before calling
HAL_SD_ReadBlocks_DMA or HAL_SD_WriteBlocks_DMA. */
__HAL_LINKDMA(&hsd1, hdmarx, hdma_sdmmc1);
__HAL_LINKDMA(&hsd1, hdmatx, hdma_sdmmc1);
/* SDMMC1 interrupt Init */
HAL_NVIC_SetPriority(SDMMC1_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(SDMMC1_IRQn);
/* DMA interrupt init */
/* DMA2_Channel4_IRQn interrupt configuration */
HAL_NVIC_SetPriority(DMA2_Channel4_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA2_Channel4_IRQn);
/* DMA2_Channel5_IRQn interrupt configuration */
HAL_NVIC_SetPriority(DMA2_Channel5_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA2_Channel5_IRQn);
hsd1.Instance = SDMMC1;
hsd1.Init.ClockEdge = SDMMC_CLOCK_EDGE_RISING;
hsd1.Init.ClockBypass = SDMMC_CLOCK_BYPASS_DISABLE;
hsd1.Init.ClockPowerSave = SDMMC_CLOCK_POWER_SAVE_DISABLE;
hsd1.Init.BusWide = SDMMC_BUS_WIDE_1B;
hsd1.Init.HardwareFlowControl = SDMMC_HARDWARE_FLOW_CONTROL_ENABLE;
hsd1.Init.ClockDiv = SDMMC_TRANSFER_CLK_DIV;Here are the function definitions in the "bsp_sd.c" of FatFS: Here the HAL_SD_RxCpltCallback is being called, but HAL_SD_TxCpltCallback is never called.
/**
* @brief Tx Transfer completed callback
* @param hsd: SD handle
* @retval None
*/
void HAL_SD_TxCpltCallback(SD_HandleTypeDef* hsd)
{
BSP_SD_WriteCpltCallback();
}
/**
* @brief Rx Transfer completed callback
* @param hsd: SD handle
* @retval None
*/
void HAL_SD_RxCpltCallback(SD_HandleTypeDef* hsd)
{
BSP_SD_ReadCpltCallback();
}The fatfs bsp_sd.c readblock/writeblock are defined like this:
/**
* @brief Reads block(s) from a specified address in an SD card, in DMA mode.
* @param pData: Pointer to the buffer that will contain the data to transmit
* @param ReadAddr: Address from where data is to be read
* @param NumOfBlocks: Number of SD blocks to read
* @retval SD status
*/
__weak uint8_t BSP_SD_ReadBlocks_DMA(uint32_t* pData, uint32_t ReadAddr, uint32_t NumOfBlocks)
{
LL_DMA_SetDataTransferDirection(&hdma_sdmmc1, LL_DMA_CHANNEL_4, LL_DMA_DIRECTION_PERIPH_TO_MEMORY);
uint8_t sd_state = MSD_OK;
/* Read block(s) in DMA transfer mode */
if (HAL_SD_ReadBlocks_DMA(&hsd1, (uint8_t*)pData, ReadAddr, NumOfBlocks) != HAL_OK)
{
sd_state = MSD_ERROR;
}
return sd_state;
}
/* USER CODE BEGIN BeforeWriteDMABlocksSection */
/* can be used to modify previous code / undefine following code / add code */
/* USER CODE END BeforeWriteDMABlocksSection */
/**
* @brief Writes block(s) to a specified address in an SD card, in DMA mode.
* @param pData: Pointer to the buffer that will contain the data to transmit
* @param WriteAddr: Address from where data is to be written
* @param NumOfBlocks: Number of SD blocks to write
* @retval SD status
*/
__weak uint8_t BSP_SD_WriteBlocks_DMA(uint32_t* pData, uint32_t WriteAddr, uint32_t NumOfBlocks)
{
LL_DMA_SetDataTransferDirection(&hdma_sdmmc1, LL_DMA_CHANNEL_4, LL_DMA_DIRECTION_MEMORY_TO_PERIPH);
uint8_t sd_state = MSD_OK;
/* Write block(s) in DMA transfer mode */
if (HAL_SD_WriteBlocks_DMA(&hsd1, (uint8_t*)pData, WriteAddr, NumOfBlocks) != HAL_OK)
{
sd_state = MSD_ERROR;
}
return sd_state;
}