1. Apparent variable conflict
In the program, there is a global variable assigned gUI = 0x0A; but it is found that gUI does not get this value, but another global variable located at the first address 0x2000 0000 in the RAM area gets this value. It feels strange, stack overflow?
Later, I checked and found that there is a statement in the previous sub-function of the program:
char ID[8];
sprintf(ID, "%02X%02X%02X%02X", Card_Id[0], Card_Id[1], Card_Id[2], Card_Id[3] );
OLED_8x16StrP(0,2,(u8 *)ID); //LCD display ID number
In the above code, ID[8] lacks the string terminator, and the OLED_8x16StrP() function uses the string terminator, that is, a byte value of 0 to determine the end of the display. Therefore, it is unknown where this function has been executed, which eventually leads to a stack overflow phenomenon. Changing char ID[8] to char ID[9] will solve the problem.
To put it bluntly, it is equivalent to an array overflow.
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