We have been facing some trouble using the SD card library to read and write data to and from an SD card with an STM32F429ZI.

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somyaV

Joined May 13, 2020
1
We have been facing some trouble using the SD card library to read and write data to and from an SD card with an STM32F429ZI. We are using the ff.h FatFs - Generic FAT file system module R0.12c library. What we have observed is that after a few reads and writes, the STM goes into a hard fault crash or a FR_DISK_ERR is returned. This was observed while running the debugger. We have tried multiple ways, even mounting the SD card and unmounting it before and after every read/write attempt. We have tried with 2gb and 4gb sd cards. The SD card used was formatted using both FAT default and FAT32.
 

ci139

Joined Jul 11, 2016
1,464
i donno too much about but some issues may rise from https://en.wikipedia.org/wiki/SD_card#Card_security
... more likely the MCU or PCB/wiring has a sync. issues . . . disable all MCU interrupts for the time of the SD access -- double check the I/O pins reconfiguration routines and the delays involved . . . also (the timings) that (are) specified for the particular SD card/controller

i have done random reading on the subject but not lately

http://academy.cba.mit.edu/classes/networking_communications/SD/SD.pdf
https://www.google.com/search?q=io+sd+speed+test+"access+mode"
 
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