system off mode in nrf51822

RE: system off mode in nrf51822

rushin — Thu, 16 Jun 2016 05:24:43 GMT

still i don't have any solution. can anyone help me??

RE: system off mode in nrf51822

rushin — Wed, 15 Jun 2016 13:52:22 GMT

why nrf52 is not advertising again??

RE: system off mode in nrf51822

rushin — Wed, 15 Jun 2016 13:51:36 GMT

how to add debouncing filter in software??

RE: system off mode in nrf51822

Øyvind Karlsen — Wed, 15 Jun 2016 13:49:26 GMT

LED blinks because the input of the button pin is bouncing, to remove this add a debouncing filter in hardware or software.

RE: system off mode in nrf51822

rushin — Wed, 15 Jun 2016 13:35:04 GMT

i can't understand what you are saying. in system off mode, LED should not blink. and after pressing button nrf52 does not advertisement again

RE: system off mode in nrf51822

Øyvind Karlsen — Wed, 15 Jun 2016 13:07:23 GMT

Hi,

This is just a functional example. The LED will blink weakly since no debouncing is implemented, ie. it will wake up on false pulses. Implement a simple software debouncing filter on wakeup to verify that the pulse was real, then perform the actual wakeup.

Best regards,

Øyvind

RE: system off mode in nrf51822

rushin — Wed, 15 Jun 2016 12:16:34 GMT

i uploaded that code in nrf52.but nrf52 don't go in system off mode.because LED is blinking

RE: system off mode in nrf51822

rushin — Wed, 15 Jun 2016 12:01:19 GMT

i tested your code on .here advertisement does not start again. can you tell me how to do it??

RE: system off mode in nrf51822

Øyvind Karlsen — Wed, 15 Jun 2016 11:39:12 GMT

This code is working fine for me on the nRF52 DK, I just added two line to the ble_app_beacon example

int main(void)
{
    uint32_t err_code;
    // Initialize.
    APP_TIMER_INIT(APP_TIMER_PRESCALER, APP_TIMER_OP_QUEUE_SIZE, false);
    err_code = bsp_init(BSP_INIT_LED, APP_TIMER_TICKS(100, APP_TIMER_PRESCALER), NULL);
    APP_ERROR_CHECK(err_code);
    ble_stack_init();
    advertising_init();

    // Start execution.
    advertising_start();
    
    
    nrf_gpio_cfg_sense_input(13, NRF_GPIO_PIN_PULLUP, NRF_GPIO_PIN_SENSE_HIGH); // Added this
    sd_power_system_off();                                                                                          // Added this
    
    // Enter main loop.
    for (;; )
    {
        power_manage();
    }
}

Make sure that you set the PULLUP/PULLDOWN and sensitivity correctly (active low or high depending on your configuration).

RE: system off mode in nrf51822

rushin — Wed, 15 Jun 2016 07:43:37 GMT

hello thanks for your support. i edited code. but somehow its not working. can you tell me what is wrong??

RE: system off mode in nrf51822

Øyvind Karlsen — Wed, 15 Jun 2016 07:18:18 GMT

Hi,

You need to configure a pin to be able to wake up from SYSTEM OFF, can be done like so:

nrf_gpio_cfg_sense_input(WAKEUP_PIN, NRF_GPIO_PIN_PULLUP, NRF_GPIO_PIN_SENSE_LOW);
sd_power_system_off():

API documentation for nrf_gpio_cfg_sense_input here.

Best regards,

Øyvind