The problem occurred when debugging EEPROM operation on stm8s003. I captured IIC communication data from the logic analyzer and saw that both reading and writing were normal. Under normal circumstances, a successful operation would directly return 0x00; but this time it always returned 0x37. Single-step tracing showed that the return was indeed 0, but after assigning the return value to a variable, it became 0x37. This driver has been used before without any problems, but I don't know why it's broken this time.
The IIC driver is in an independent C file, and the call is in another file, which is referenced through the extern declaration in the header file. After cross-comparison with the previous program, it was found that the function declaration in IIC.h was commented out, which is equivalent to calling it directly without declaration. Finally, after removing the comment, it returned to normal.
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