i use stm32f107vct6 and stm32f103c8 and keil v5.
i use rl-keil for initial micro sd and work good.
but sometimes (its very random on 1 minute or many hour) memory doesn't work and i can't read and write.
i confused because i used that code 3 month ago and work without any problem and i don't change anything(just compile code again).
i thing maybe problem was in board so i create new pcb but on two micro and two pcb i have same problem.
anybody can help me?