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stm32f746disc sdmmc with fatfs make problem while read or open file in 4 bit mode

Question asked by elbeshlawy.mohammed on Mar 6, 2017
Latest reply on Mar 6, 2017 by elbeshlawy.mohammed

I use fatfs to read text file line by line every time 

when i use normal sdmcc driver which initialize sd wide mode to 4 B  i got fault errors randomly and fatfs hang or stuck at hal sd_getscr function

so i have to change driver setting to 1B mode

I searched too much but couldnot find the problem solution