Posted on June 03, 2015 at 22:42
Hi,
It's my belief that the HAL SDIO cannot be used reliably without DMA and the supplied FF code does not use DMA. So it fails. Why do you need to use DMA? Well, the SD HW flow control is unusable and so you have to ensure that data can be read/written from the SDIO in a timely fashion otherwise you get overruns.
Enable SD DMA and modify sd_diskio.c as shown in the following snippet.
/**
* @brief Reads Sector(s)
* @param *buff: Data buffer to store read data
* @param sector: Sector address (LBA)
* @param count: Number of sectors to read (1..128)
* @retval DRESULT: Operation result
*/
DRESULT SD_read(BYTE *buff, DWORD sector, UINT count)
{
DRESULT res = RES_OK;
if(BSP_SD_ReadBlocks_DMA((uint32_t*)buff,
(uint64_t)sector * BLOCK_SIZE,
BLOCK_SIZE,
count) != MSD_OK)
{
res = RES_ERROR;
}
return res;
}
/**
* @brief Writes Sector(s)
* @param *buff: Data to be written
* @param sector: Sector address (LBA)
* @param count: Number of sectors to write (1..128)
* @retval DRESULT: Operation result
*/
#if _USE_WRITE == 1
DRESULT SD_write(const BYTE *buff, DWORD sector, UINT count)
{
DRESULT res = RES_OK;
if(BSP_SD_WriteBlocks_DMA((uint32_t*)buff,
(uint64_t)sector * BLOCK_SIZE,
BLOCK_SIZE, count) != MSD_OK)
{
res = RES_ERROR;
}
return res;
}
#endif /* _USE_WRITE == 1 */
