SD_Read bug?

Posted on November 29, 2017 at 14:53

Good day everyone,

I'm not sure if this is a bug or I'm looking at this incorrectly, but It seems to be a bug.

While calling the f_mount function there is a point where SD_read is called.

DRESULT SD_read(BYTE lun, BYTE *buff, DWORD sector, UINT count)

{

DRESULT res = RES_ERROR;

ReadStatus = 0;

uint32_t timeout;

if (ENABLE_SD_DMA_CACHE_MAINTENANCE == 1)

uint32_t alignedAddr;

endif

if(BSP_SD_ReadBlocks_DMA((uint32_t*)buff,

(uint32_t) (sector),

count) == MSD_OK)

{

/* Wait that the reading process is completed or a timeout occurs */

timeout = HAL_GetTick();

while((ReadStatus == 0) && ((HAL_GetTick() - timeout) < SD_TIMEOUT))

{

}

/* incase of a timeout return error */

if (ReadStatus == 0)

{

res = RES_ERROR;

}

else

{

ReadStatus = 0;

timeout = HAL_GetTick();

while((HAL_GetTick() - timeout) < SD_TIMEOUT)

{

if (BSP_SD_GetCardState() == SD_TRANSFER_OK)

{

res = RES_OK;

if (ENABLE_SD_DMA_CACHE_MAINTENANCE == 1)

/*

the SCB_InvalidateDCache_by_Addr() requires a 32-Bit aligned address,

adjust the address and the D-Cache size to invalidate accordingly.

*/

alignedAddr = (uint32_t)buff & ~3;

SCB_InvalidateDCache_by_Addr((uint32_t*)alignedAddr, count*BLOCKSIZE + ((uint32_t)buff - alignedAddr));

endif

break;

}

}

}

}

return res;

}

After this call my code enters

f(BSP_SD_ReadBlocks_DMA((uint32_t*)buff,(uint32_t) (sector),count) == MSD_OK)

and passes it successfully, after which it gets stuck in the while loop.

while((ReadStatus == 0) && ((HAL_GetTick() - timeout) < SD_TIMEOUT))

{

}

After this the problem occurs and that is:

if (ReadStatus == 0)

{

res = RES_ERROR;

}

the function always gets stuck here no matter what. So i went and looked at all the calls for ReadStatus in my project and this popped up:

From here it seems there's one callback that will ensure the SD_Read passes and thats BSP_SD_ReadCpltCallback. Although this is never called anywhere in the project and therefore SD_Read always fails. Therefore it always remain 0 and the LL read function fails. This is cube generated.

Is this a mistake from my side or CubeMX??

I'm using the latest cube(V 4.0 and the latest Hal(1.8.0) for the stm32F7

f_mount-sdcard sdcard cubemx-project stm32f7-hal stm32f7