watchdog.c

#include "dev/watchdog.h"
#include "derivative.h"
#include "contiki-conf.h"
#include "cpu.h"
#include <stdio.h>

static volatile uint8_t watchdog_status;

void watchdog_init(void) {
        /* Once configured, it cannot be reconfigured or stopped. */
        
#if (DISABLE_WDOG == 0)
        /* Lock in Watchdog settings. */
        /* Configure Watchdog to timout after 1.024s. */
        SIM_COPC = SIM_COPC_COPT(0x03); 
#endif
        
}

void watchdog_start(void) {
        /* The watchdog starts with the core. */
#if (DISABLE_WDOG == 0) 
        CPU_Watchdog_Enable();
#endif  
}

void watchdog_periodic(void) {
        /* This function is called periodically to restart the watchdog
           timer. */
#if (DISABLE_WDOG == 0) 
        SIM_SRVCOP = 0x55;
        SIM_SRVCOP = 0xAA;
#endif  
}

void watchdog_stop(void) {
        /* We cannot actually stop the watchdog once running. */
#if (DISABLE_WDOG == 0) 
        CPU_Watchdog_Disable();
#endif          
}

void watchdog_reboot(void) {
        /* Trigger a reboot by writing junk to the COP register. */
        //printf("\n\rCode-Induced Watchdog.\n\r");
        //SIM_SRVCOP = 0xFF;
        uint16_t endian = SCB->AIRCR & 0x8000;
        
        SCB->AIRCR = 0x05FA0004 | endian;
}


#if (DISABLE_WDOG == 0) 
uint8_t CPU_Watchdog_Disabled(void) {
        return watchdog_status;
}

void CPU_Watchdog_Disable(void) {
        watchdog_status = 1;
}
void CPU_Watchdog_Enable(void) {
        watchdog_status = 0;
}
#endif