The framework of the program has been completed. After turning on the watchdog, all that remains is to improve the program structure.
Keywords：PIC
Reference address：PIC16-bit microcontroller CAN (8) watchdog
According to the documentation, the watchdog is mainly about the configuration bits. Here is my configuration:
_FWDT(WDTPOST_PS4096&WDTPRE_PR32&PLLKEN_OFF&WINDIS_OFF&FWDTEN_ON);
//Post divider 4096 (4096*1ms=4s) Pre divider 32 (1ms) Disable watchdog window mode Enable watchdog
The gatekeeper has an independent 32KHz clock that can be operated through pre-scaling and post-scaling.
The Watchdog Timer clock source provided by the LPRC is nominally 32 kHz. This signal is fed into a prescaler that can be configured for either 5-bit (divide-by-32) or 7-bit (divide-by-128) operation. The prescaler ratio is set using the WDTPRE Configuration bit. With a 32 kHz input, the prescaler will produce a nominal WDT time-out period (TWDT) of 1 ms in 5-bit mode and 4 ms in 7-bit mode.
A variable postscaler divides the output of the WDT prescaler to obtain a wide range of time-out periods. The postscaler ratio is controlled by the WDTPOST<3:0> Configuration bits (FWDT<3:0>), which allow the selection of 16 settings from 1:1 to 1:32,768. Using the prescaler and postscaler, the time-out period range can be extended from 1 ms to 131 seconds.
The next thing is to enable the watchdog. There is nothing more to say... Finally, remember to feed the watchdog. Here the watchdog is reset once every 4s. I feed the watchdog in the 1s timer interrupt.
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