hal_wdt.c

#include "nrf.h"
#include "stddef.h"
#include "hal_wdt.h"
#include "nrf_util.h"
#include "common_util.h"

#if ISR_MANAGER == 1
#include "isr_manager.h"
#endif

#define WDT_RR_VALUE       0x6E524635UL

void (*wdt_irq_handler)(void);

void hal_wdt_init(uint32_t period_ms, void (*wdt_timeout_handler)(void))
{
    //In case the WDT is already running
    if (NRF_WDT->RUNSTATUS == WDT_RUNSTATUS_RUNSTATUS_Running)
    {
        hal_wdt_feed();
    }
    else
    {
        //Run when sleeping, pause when debugging
        NRF_WDT->CONFIG = (WDT_CONFIG_SLEEP_Run << WDT_CONFIG_SLEEP_Pos)
                | (WDT_CONFIG_HALT_Pause << WDT_CONFIG_HALT_Pos);

        NRF_WDT->CRV = LFCLK_TICKS_MS(period_ms);

        //Enable only RR1 and RR7. Two registers so it won't be randomly fed.
        NRF_WDT->RREN = (WDT_RREN_RR1_Enabled << WDT_RREN_RR1_Pos)
                | (WDT_RREN_RR7_Enabled << WDT_RREN_RR7_Pos);

        wdt_irq_handler = wdt_timeout_handler;

        NRF_WDT->INTENSET = WDT_INTENSET_TIMEOUT_Enabled;

        //APP_IRQ_PRIORITY_HIGH define works with or without SD in all nRF5x
        NVIC_ClearPendingIRQ(WDT_IRQn);
        NVIC_SetPriority(WDT_IRQn, APP_IRQ_PRIORITY_HIGH);
        NVIC_EnableIRQ(WDT_IRQn);
    }
}

void hal_wdt_feed(void)
{
    //Reload the two registers enabled.
    NRF_WDT->RR[1] = WDT_RR_VALUE;
    NRF_WDT->RR[7] = WDT_RR_VALUE;
}

void hal_wdt_start(void)
{
    NRF_WDT->TASKS_START = 1;
}

#if ISR_MANAGER == 1
void hal_wdt_Handler ()
#else
void WDT_IRQHandler(void)
#endif
{
#if ISR_MANAGER == 0
    NRF_WDT->EVENTS_TIMEOUT = 0;
#endif
    if (wdt_irq_handler != NULL)
    {
        wdt_irq_handler();
    }
}