Problem description: 1. The card can be read after boot. 2. There is a small probability that the card will not be read after starting dormancy. 3. After closing the screen, opening the screen has a certain probability that the card can not be read and can be repeated. 4. Under the above circumstances, if you can not read the card and turn off the screen many times, you can return to normal;
Could you narrow down the issue? e.g. add printf function to check where is the problem? or any error message when card not able to read?
Retrieving data ...