Posted on June 14, 2018 at 23:28How to reproduce:
1) Use STM32Cube FW_F4 V1.21.0 (not tested on other versions)
2) Set up SDIO 1-bit mode with default parameters.
3)
4) Set up FatFS with SDIO driver
with default parameters
.
5) Set 'Use dma template'=enabled for SDIO (this is critical, bug does not exist in 'disabled' mode).
6) You need a microsd with file longer than sector size.
7) Use code:
FATFS SDFatFs;
FIL TestFile;
UINT BytesRead;
uint8_t buffer[2048];
FRESULT res = f_mount(&SDFatFs, (char*)SDPath, 0);
if (res==FR_OK)
{
res = f_open(&
TestFile
, 'test.bin', FA_READ);
if (res != FR_OK)
while (1);
}
f_lseek(&
TestFile
, 4);
f_read(&
TestFile
, buffer, sizeof(buffer), &BytesRead);
8) Result: first 498 byte read correctly, then byte offset jumps 4 bytes back (exactly the value, used in f_lseek) and next data is read with broken offset.
Temporary fix:
