I have added WDT to the blinky_freertos sample.
/** add **/
static nrf_drv_wdt_channel_id m_channel_id;
static void wdt_event_handler(void)
{
}
/**********/
int main(void)
{
ret_code_t err_code;
/* Initialize clock driver for better time accuracy in FREERTOS */
err_code = nrf_drv_clock_init();
APP_ERROR_CHECK(err_code);
/* Configure LED-pins as outputs */
bsp_board_init(BSP_INIT_LEDS);
/* Create task for LED0 blinking with priority set to 2 */
UNUSED_VARIABLE(xTaskCreate(led_toggle_task_function, "LED0", configMINIMAL_STACK_SIZE + 200, NULL, 2, &led_toggle_task_handle));
/* Start timer for LED1 blinking */
led_toggle_timer_handle = xTimerCreate( "LED1", TIMER_PERIOD, pdTRUE, NULL, led_toggle_timer_callback);
UNUSED_VARIABLE(xTimerStart(led_toggle_timer_handle, 0));
/* Activate deep sleep mode */
SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
/** add **/
nrf_drv_wdt_config_t config = NRF_DRV_WDT_DEAFULT_CONFIG;
err_code = nrf_drv_wdt_init(&config, wdt_event_handler);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_wdt_channel_alloc(&m_channel_id);
APP_ERROR_CHECK(err_code);
nrf_drv_wdt_enable();
/*********/
/* Start FreeRTOS scheduler. */
vTaskStartScheduler();
while (true)
{
/* FreeRTOS should not be here... FreeRTOS goes back to the start of stack
* in vTaskStartScheduler function. */
}
}
And I am debugging with SEGGER ozone.
building with SDK17:
If you reset the software in the debugger and start it, the application freezes.
t stops in the following loop.
And RTC1 is not counting up.
*********************************************************************
port_cmsis_systick.c
/* No SD - we would just block interrupts globally.
* BASEPRI cannot be used for that because it would prevent WFE from wake up.
*/
do{
__WFE();
} while (0 == (NVIC->ISPR[0] | NVIC->ISPR[1]));
**********************************************************************
However, after WDT reset, blinky works normally.
I have built the same application with SDK15.
It was perfectly fine.
SDK17 seems to have a problem.
I found a difference with SDK15.
SDK17 nrf_drv_clock.c
*****************************************
nrf_drv_clock_init()
...
if (nrf_wdt_started())
{
m_clock_cb.lfclk_on = true;
}
*****************************************
If a software reset occurs after WDT is activated, WDT remains activated after the reset. However, LFCLK is stopped.
As a result, the above process does not start LFCLK, so even if RTC1 is started, it will not be counted up.
