cancel
Showing results for 
Search instead for 
Did you mean: 

SDIO FATFS SDMMC_ERROR_COM_CRC_FAILED

vbesson
Senior

Hello, 

I am using a STM32F411 with SDIO (4bit) and fatfs

When reading block I have regular SDMMC_ERROR_COM_CRC_FAILED error, from 

SDMMC_GetCmdResp1 function. 
What could be the reason for such error ? thanks
Vincent 
 

 

1 ACCEPTED SOLUTION

Accepted Solutions

Data corruption on the wire?

Signal integrity, cross talk..

Data and command line should have pullup resistors, line lengths relatively consistent. 

Tips, Buy me a coffee, or three.. PayPal Venmo
Up vote any posts that you find helpful, it shows what's working..

View solution in original post

2 REPLIES 2

Data corruption on the wire?

Signal integrity, cross talk..

Data and command line should have pullup resistors, line lengths relatively consistent. 

Tips, Buy me a coffee, or three.. PayPal Venmo
Up vote any posts that you find helpful, it shows what's working..

I fixed the issue by changing the ClockDiv from 0 to 2 

Vincent