nrf_bootloader_wdt.c

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#include "nrf_bootloader_wdt.h"
#include "nrf_wdt.h"
#include "nrf_bootloader_dfu_timers.h"
#include "nrf_log_ctrl.h"
 
#define NRF_LOG_MODULE_NAME nrf_bootloader_wdt
#include "nrf_log.h"
NRF_LOG_MODULE_REGISTER();
 
 
static void wdt_feed(void)
{
    if (nrf_wdt_started())
    {
        for (nrf_wdt_rr_register_t i = NRF_WDT_RR0; i < NRF_WDT_RR7; i++)
        {
            if (nrf_wdt_reload_request_is_enabled(i))
            {
                nrf_wdt_reload_request_set(i);
            }
        }
    }
}
 
 
static void wdt_feed_timer_handler(void)
{
    NRF_LOG_INFO("Internal feed");
    wdt_feed();
}
 
 
void WDT_IRQHandler(void)
{
    nrf_wdt_event_clear(NRF_WDT_EVENT_TIMEOUT);
    NRF_LOG_FINAL_FLUSH();
}
 
#define MAX_FLASH_OP_TIME_TICKS 3200 // ~100 ms
 
void nrf_bootloader_wdt_init(void)
{
    static bool initialized = false;
 
    if (initialized)
    {
        return;
    }
 
    if (nrf_wdt_started())
    {
        uint32_t wdt_ticks = nrf_wdt_reload_value_get();
 
        NRF_LOG_INFO("WDT enabled CRV:%d ticks", wdt_ticks);
 
        //wdt_ticks must be reduced to feed the watchdog before the timeout.
        uint32_t reduced_timeout_ticks = MAX((int32_t)wdt_ticks - MAX_FLASH_OP_TIME_TICKS,
                                             NRF_BOOTLOADER_MIN_TIMEOUT_TICKS);
 
        // Timer is 24-bit and asserts if larger value than 2`24-1 is given. 
        reduced_timeout_ticks = (reduced_timeout_ticks > (1<<20))? (1<<20) : reduced_timeout_ticks;
        NRF_LOG_INFO("Starting a timer (%d ticks) for feeding watchdog.", reduced_timeout_ticks);
        nrf_bootloader_wdt_feed_timer_start(reduced_timeout_ticks, wdt_feed_timer_handler);
 
        /* initial watchdog feed */
        wdt_feed();
 
 
        NVIC_EnableIRQ(WDT_IRQn);
    }
    else
    {
        NRF_LOG_INFO("WDT is not enabled");
    }
 
    initialized = true;
}
 
void nrf_bootloader_wdt_feed(void)
{
    if (nrf_wdt_started())
    {
        wdt_feed();
    }
}