hardware reset

[yichen]

hello all:

my mcu is nrf51822(QFAA), and use it to make a blue device ,i want to use mcu's reset pin to reset it, just use hardware. i add a key to connect the reset pin,when the key is press down, the reset pin is low level,it could be reset system. and i try many times,sometime it can be reset ok,and sometime it can't reset.what should i do to make it reset whenever i press down the key? do you have any ways ? is it need other capacitive resistor?please help me , thanks

[FormerMember]

When the reset doesn't work, it is a chance that the chip is accidentally in debug mode. To check if that is the case you can enable reset pin in debug mode: NRF_POWER->RESET = 1;, and then test the reset button, check if the problem is still there or if it is gone.

If there is a problem with debug mode,it can be useful to have a look at this thread.

[yichen]

i add this "NRF_POWER->RESET = 1; "in my init function,then the system is always reset

[FormerMember]

What is the state of the reset button?

[yichen]

i don't press the reset button,maybe that means the reset pin is always high level

[yichen]

this is my main function,i add NRF_POWER->RESET = 1;in main function as follows

int main(void)
{
	nrf_delay_ms(1000);
	SEGGER_RTT_printf(0,"Build Time:%s-%s\r\n", __DATE__, __TIME__);
	led_init();
	nrf_delay_ms(100);
	nrf_gpio_pin_clear(LED_RED);
    timers_init();
    ble_stack_init();
	get_my_addr();
	adv_mac_name(adv_mac_str);
    gap_params_init();
    services_init();
    advertising_init();
    conn_params_init();
    ble_advertising_start(BLE_ADV_MODE_FAST);
	buttons_init();
	config_wdt();
	led_on_off_timers_start();
	battery_start();	
	NRF_POWER->RESET=1;
	SEGGER_RTT_printf(0,"init ok!!!!!!!!!\r\n");
    // Enter main loop.
    for (;;)
    {
        power_manage();
    }
}

[FormerMember]

When I test here, adding NRF_POWER->RESET = 1 to a nRF51 example, a reset is not continuously triggered. For reference, could you test the same example as I am testing: led_softblink:

int main(void)
{
    ret_code_t err_code;
    
    lfclk_init();

    // Start APP_TIMER to generate timeouts.
    APP_TIMER_INIT(APP_TIMER_PRESCALER, OP_QUEUES_SIZE, NULL);

    const led_sb_init_params_t led_sb_init_param = LED_SB_INIT_DEFAULT_PARAMS(LEDS_MASK);

    err_code = led_softblink_init(&led_sb_init_param);
    APP_ERROR_CHECK(err_code);
	
		NRF_POWER->RESET = 1;

    err_code = led_softblink_start(LEDS_MASK);
    APP_ERROR_CHECK(err_code);

    while (true)
    {
        __WFE();
    }
}