STM32 personal notes - program run and fly

Part of the notes are from the public account of "STM32 Embedded Development".

Program running score

Number out of bounds/overflow

Phenomena: When the microcontroller program runs in a function, it always runs to the end of the function, and when it wants to jump out of the function, the program runs away.

Cause: Array out of range (array overflow).such as

uint8_t ucDataBuff[10]={0};ucDataBuff[10]=0x1;

Solution: When debugging the program, if you find that the program always runs away when the function is executed, in most cases an array out-of-bounds (array overflow) error has occurred. Carefully check whether the array called in the function is out-of-bounds (overflow).)Case.

Interrupt service function is missing

Phenomena: The program always runs away during the running process.

Cause: An interrupt is enabled in the program, but there is no corresponding interrupt service routine, so that after the interrupt occurs, the entry of the interrupt service routine cannot be found, resulting in the program running away.

Solution: Check whether there is an interrupt turned on in the program, but there is no corresponding interrupt service routine.

Watchdog reset

Phenomena: When executing a relatively time-consuming program, the program runs away and always jumps to the reset position.

Reason: The watchdog is used in the program, but the dog is not fed in time, which causes the watchdog to reset and the program jumps directly to the reset position.

Solution: According to the running time of the program, especially the running time of the most time-consuming part of the program must be calculated, and then accurately set the reset time of the watchdog, and feed the dog regularly.Especially if there is an infinite loop, be sure to remember to feed the dog in the infinite loop.