Issues with SD Card when waiting for SD Card Ready
Hi everybody,
I've got an STM32H743XI and use the Cube V1.3.2 Firmware for an project for my master thesis.
To this controller I have connected a SD Card with the SDMMC controller using the 4 bit bus. I also use FreeRtos and don't want a blocking read or write to the card.
Therefore I added a Freertos Notification that the Interrupt wakes up the thread who has written to the card. The thread has the highest priority and will be called 5 µs after the transfer complete interrupt. After I have written one time the SD structure State is HAL_SD_STATE_READY but the ErrorCode is 1 which should mean SDMMC_ERROR_CMD_CRC_FAIL.
This is the code which produces the fault.
/* Function to write to the SD Card */
void WriteToSDCard(uint8_t *pData, uint32_t BlockAdd, uint32_t NumberOfBlocks)
{
uint32_t ulNotificationValue;
xTaskToNotify = xTaskGetCurrentTaskHandle();
HAL_SD_WriteBlocks_DMA(&hsd1, pData, BlockAdd, NumberOfBlocks);
ulNotificationValue = ulTaskNotifyTake( pdTRUE, 1000000); //Wait for the Interrupt
if(ulNotificationValue == 0)
{
Error_Handler();
}
if(Wait_SDCARD_Ready() != HAL_OK)
{
Error_Handler();
}
}
/* Function from the Example */
static uint8_t Wait_SDCARD_Ready(void)
{
uint8_t retval = HAL_ERROR;
uint32_t loop = ((uint32_t)0x01000000U);
/* Wait for the Erasing process is completed */
/* Verify that SD card is ready to use after the Erase */
while(loop > 0)
{
loop--;
if(HAL_SD_GetCardState(&hsd1) == HAL_SD_CARD_TRANSFER)//HAL_SD_CARD_TRANSFER
{
retval = HAL_OK;
break;
}
}
return retval;
}
/**
* @brief Tx Transfer completed callbacks
* @param hsd: SD handle
* @retval None
*/
void HAL_SD_TxCpltCallback(SD_HandleTypeDef *hsd)
{
BaseType_t xHigherPriorityTaskWoken = pdFALSE;
vTaskNotifyGiveFromISR( xTaskToNotify, &xHigherPriorityTaskWoken ); //Free the thread
xTaskToNotify = NULL;
portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
}This Code doesn't work because of the CRC error.
If I write and read from the SD Card like in the example SD_ReadWrite_DMA and call the function Wait_SDCARD_Ready() inside the interrupt, everything works fine an I achive an read and write speed of about 20 MBytes/s. But this means, when I measure the time, the function Wait_SDCARD_Ready() waits 1 ms in the interrupt and blocks the FreeRtos threads.
This is the Code which works.
/* Write Function */
void WriteToSDCard(uint8_t *pData, uint32_t BlockAdd, uint32_t NumberOfBlocks)
{
uint32_t ulNotificationValue;
xTaskToNotify = xTaskGetCurrentTaskHandle();
HAL_SD_WriteBlocks_DMA(&hsd1, pData, BlockAdd, NumberOfBlocks);
ulNotificationValue = ulTaskNotifyTake( pdTRUE, 1000000);
if(ulNotificationValue == 0)
{
Error_Handler();
}
}
/* Function from the example Project*/
static uint8_t Wait_SDCARD_Ready(void)
{
uint8_t retval = HAL_ERROR;
uint32_t loop = ((uint32_t)0x01000000U);
/* Wait for the Erasing process is completed */
/* Verify that SD card is ready to use after the Erase */
while(loop > 0)
{
loop--;
if(HAL_SD_GetCardState(&hsd1) == HAL_SD_CARD_TRANSFER)//HAL_SD_CARD_TRANSFER
{
retval = HAL_OK;
break;
}
}
return retval;
}
/**
* @brief Tx Transfer completed callbacks
* @param hsd: SD handle
* @retval None
*/
void HAL_SD_TxCpltCallback(SD_HandleTypeDef *hsd)
{
if(Wait_SDCARD_Ready() != HAL_OK)
{
Error_Handler();
}
BaseType_t xHigherPriorityTaskWoken = pdFALSE;
vTaskNotifyGiveFromISR( xTaskToNotify, &xHigherPriorityTaskWoken );
xTaskToNotify = NULL;
portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
}Can someone please explain me, why I get CRC errors, when I call the Wait_SDCARD_Ready() function outside of the interrupt, but 5 µs later inside the thread?
Best regards,
Max