Posted on April 30, 2018 at 18:19Hi
I'm trying to write some test data to SD card by DMA with Nucleo-F767Zi.
Every 100ms I write 20 blocks to SD card by calling the HAL_SD_WriteBlocks_DMA() method.
I have a counter to record how many times the HAL_SD_WriteBlocks_DMA() have been called since the power up.
The HAL_SD_ERROR_DATA_TIMEOUT error interrupt rise up after hundreds calls , sometime several calls.
I read the reference manual.
It says 'When transmitting data, the timeout occurs if the DPSM stays in the Busy state for longer than the programmed timeout period'.
I wonder what should I do to prevent the HAL_SD_ERROR_DATA_TIMEOUT error?
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The clock of SDMMC is 24Mhz. The SD card is Sony 16GB class 4.
SDMMC configuration is:
SDHandle_SDMMC.Instance = SDMMC2;
SDHandle_SDMMC.Init.ClockEdge = SDMMC_CLOCK_EDGE_RISING;
SDHandle_SDMMC.Init.ClockBypass = SDMMC_CLOCK_BYPASS_DISABLE;
SDHandle_SDMMC.Init.ClockPowerSave = SDMMC_CLOCK_POWER_SAVE_DISABLE;
SDHandle_SDMMC.Init.HardwareFlowControl = SDMMC_HARDWARE_FLOW_CONTROL_ENABLE;
SDHandle_SDMMC.Init.ClockDiv = 0;
The related interrupt code in HAL_SD_IRQHandler is:
……
else if(__HAL_SD_GET_FLAG(hsd, SDMMC_IT_DCRCFAIL | SDMMC_IT_DTIMEOUT | SDMMC_IT_RXOVERR | SDMMC_IT_TXUNDERR) != RESET)
{
/* Set Error code */
if(__HAL_SD_GET_FLAG(hsd, SDMMC_IT_DCRCFAIL) != RESET)
{
hsd->ErrorCode |= HAL_SD_ERROR_DATA_CRC_FAIL;
}
if(__HAL_SD_GET_FLAG(hsd, SDMMC_IT_DTIMEOUT) != RESET)
{
hsd->ErrorCode |= HAL_SD_ERROR_DATA_TIMEOUT;
}
if(__HAL_SD_GET_FLAG(hsd, SDMMC_IT_RXOVERR) != RESET)
{
hsd->ErrorCode |= HAL_SD_ERROR_RX_OVERRUN;
}
if(__HAL_SD_GET_FLAG(hsd, SDMMC_IT_TXUNDERR) != RESET)
{
hsd->ErrorCode |= HAL_SD_ERROR_TX_UNDERRUN;
}
……
