sometimes the device wakes up immediately after calling sleep function

RE: sometimes the device wakes up immediately after calling sleep function

Einar Thorsrud — Thu, 31 Jan 2019 14:17:53 GMT

You do not strictly need to do anything other than configuring wakeup sources, though it is clean to uninitialize stuff first. However, you must make sure that there are no active events on the GPIO ins used as sense, if so and they are not cleared, they will cause an immediate wakeup. I suspect that is what you are seeing.

RE: sometimes the device wakes up immediately after calling sleep function

madblue — Thu, 31 Jan 2019 11:09:26 GMT

Hi,

thanks for the update, my original code was actually like this. my function had a lot of commented things inside the actual code, when i cleaned and copy pasted, those lines got misplaced. 😑

i want to know anything to be done in particular before calling the function sd_power_system_off(); ?

RE: sometimes the device wakes up immediately after calling sleep function

Einar Thorsrud — Thu, 31 Jan 2019 08:41:14 GMT

Hi,

This question might be obvious, but have you verified that there is no activity on either of the two wakeup pins which could cause the wakeup? Without knowing more about your code I would think rearranging your goto_deepsleep() to something like this would be more sensible:

void goto_deepsleep(void){
    enable_imu_power_down();
    uninit_timer();
    uninit_spi();
    
    uninit_i2c();

    nrf_gpio_cfg_sense_input(INT_PIN, NRF_GPIO_PIN_PULLUP, NRF_GPIO_PIN_SENSE_LOW);
    nrf_gpio_cfg_sense_input(17, NRF_GPIO_PIN_PULLUP, NRF_GPIO_PIN_SENSE_LOW);

    sd_power_system_off();
}