stm32f103 window watchdog-EEWORLD

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stm32 has two watchdogs: an independent watchdog that can reset the CPU when a hardware failure is detected, and a window watchdog that can reset the CPU when a software failure is detected.

I use a window watchdog in my program, which has two window values: the upper window value can be configured by the bottom seven bits of the WWDG->CFR register, and the lower window value is fixed at 0x40. The bottom seven bits of WWDG_CR are the count value of the watchdog.

When count is updated outside the window value or the count value is less than 0x40, the window watchdog resets the CPU. Here are some points to note: 1. The delay function feeds the dog as follows

for(i=0;i<1000;i++){
delayms(1);
FEED_DOG;
}

2. When debugging, add the code to light up the lamp at the beginning of the main function: first check whether the lamp goes out when the reset button is pressed. Sometimes the CPU does not work, but the lamp is still on. In this way, you don't know whether the dog has been reset.

Relevant debugging information can be printed through the serial port.

Keywords：stm32f103 Reference address：stm32f103 window watchdog

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