ruuvi_nrf5_sdk15_watchdog.c

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#include "ruuvi_driver_enabled_modules.h"
#include "ruuvi_interface_watchdog.h"
#if RUUVI_NRF5_SDK15_WATCHDOG_ENABLED
#include "ruuvi_driver_error.h"
#include "ruuvi_nrf5_sdk15_error.h"
#include "ruuvi_interface_log.h"
#include "ruuvi_interface_power.h"
#include "nrf_drv_clock.h"
#include "nrf_drv_wdt.h"
#include <stdbool.h>
 
nrf_drv_wdt_channel_id m_channel_id;
wdt_evt_handler_t      m_on_trigger;
 
void wdt_event_handler (void)
{
    //NOTE: The max amount of time we can spend in WDT interrupt is two cycles of 32768[Hz] clock - after that, reset occurs
    if (NULL != m_on_trigger)
    {
        m_on_trigger();
    }
 
    ri_log (RI_LOG_LEVEL_ERROR, "WDT Triggered, reset\r\n");
 
    while (1);
}
 
rd_status_t ri_watchdog_init (const uint32_t interval_ms, const wdt_evt_handler_t handler)
{
    uint32_t err_code = NRF_SUCCESS;
    nrf_drv_wdt_config_t config = NRF_DRV_WDT_DEAFULT_CONFIG;
    config.reload_value = interval_ms;
    err_code = nrf_drv_wdt_init (&config, wdt_event_handler);
 
    if (NRF_SUCCESS == err_code)
    {
        err_code = nrf_drv_wdt_channel_alloc (&m_channel_id);
 
        if (NRF_SUCCESS == err_code)
        {
            nrf_drv_wdt_enable();
 
            // Halting the LFCLK while WDT is running hangs the program.
            // Request LFCLK to make sure it's never stopped after this point.
            // https://devzone.nordicsemi.com/f/nordic-q-a/45584/softdevice-hangs-forever-during-disable-while-stopping-lfclk
            // Initialize clock if not already initialized
            if (false == nrf_drv_clock_init_check())
            {
                err_code |= nrf_drv_clock_init();
            }
 
            nrf_drv_clock_lfclk_request (NULL);
        }
    }
 
    m_on_trigger = handler;
    return ruuvi_nrf5_sdk15_to_ruuvi_error (err_code);
}
 
rd_status_t ri_watchdog_feed (void)
{
    nrf_drv_wdt_channel_feed (m_channel_id);
    return RD_SUCCESS;
}
 
#endif