low_power_pwm_stop does not work increasing the consumption by 200 uA

[Esteban Gutiérrez Correa]

Hello to all

I'm working in an application that needs to be completely power optimized. In this program the device works as a scanner that if it finds an specific device then puts a pwm in a pin, I already got this working with a low_power_pwm. The problem is that when the power_manage function is working, i.e, when the device is almost asleep, the consumption is 240uA, I managed to track 200 uA of this due to the low_power_pwm being activated, tried to use low_power_pwm_stop but didn't work it just keep the pin in a 100% duty, tried the solutions posted here, didn't work. The last thing I tried was sd_power_system_off but without an external wake up call it just stays in deep sleep and I believe even if this woke up with a timer, it wouldn't be a good option for my application. Appreciate any help you can give me, thanks :)

[Sigurd]

Can you also post the code where you turn the low_power_pwm off ?

[Esteban Gutiérrez Correa]

static void on_ble_evt(ble_evt_t * p_ble_evt) {

    	switch (p_ble_evt->header.evt_id) {
    
    	case BLE_GAP_EVT_ADV_REPORT:
    		scan_filter(p_ble_evt);
    		break; // BLE_GAP_EVT_ADV_REPORT
    	.
            .
            .
    }
    
    uint8_t relevant_MAC[] = { 0xE6, 0x56, 0xDB, 0x4A, 0x93, 0xD0 };
    bool strcmp_MAC_PeerAddress;
    unsigned char i;
    static void scan_filter(ble_evt_t * p_ble_evt) {
    	/*Variable que nos guarda los datos del nuevo dispositivo*/
    	const ble_gap_evt_t * p_gap_evt = &p_ble_evt->evt.gap_evt;
    
    	const ble_gap_evt_adv_report_t * p_adv_report =
    			&p_gap_evt->params.adv_report;
    
    	strcmp_MAC_PeerAddress = memcmp((char *) relevant_MAC,
    			(char *) p_adv_report->peer_addr.addr, 6);
    
    	if (!strcmp_MAC_PeerAddress) {
    		flagRelevant_MAC = true;
    		
    		if (p_adv_report->data[2] == 0x00) {
    			flag_NoConnected = 1;
    		} else if (p_adv_report->data[2] == 0x01) {
    			flag_NoConnected = 2;
    		}
    	}
    }

[Sigurd]

Where are you calling low_power_pwm_stop(&low_power_pwm_2) ?

[Esteban Gutiérrez Correa]

This is the Timer handler, the commented code are the functions I have tried to optimize the consumption:

char interruptSeconds = 0;
unsigned char flag_NoConnected = false;
#define PIN_OUT 04
bool flagRelevant_MAC = false;

static void timer_timeout_handler(void * p_context) {
	scanSeconds++;

	if(!flagRelevant_MAC){
		low_power_pwm_duty_set(&low_power_pwm_2, 100);
		nrf_gpio_pin_clear(PIN_OUT);
		//sd_power_system_off();
		//sd_app_evt_wait();
	}

if (flag_NoConnected == 1 && flagRelevant_MAC == 1) {
		low_power_pwm_start(&low_power_pwm_2, low_power_pwm_2.bit_mask);
		if (interruptSeconds == 0) {
			nrf_gpio_pin_set(PIN_OUT);
			low_power_pwm_duty_set(&low_power_pwm_2, 60);
		} else if (interruptSeconds == 1) {
			low_power_pwm_duty_set(&low_power_pwm_2, 100);
			nrf_gpio_pin_clear(PIN_OUT);

[Esteban Gutiérrez Correa]

here continues

} else if (interruptSeconds == 4) {
			interruptSeconds = 0;
			nrf_gpio_pin_set(PIN_OUT);
			low_power_pwm_duty_set(&low_power_pwm_2, 60);
			flagRelevant_MAC = false;
		}
		interruptSeconds++;
	}

	if (flag_NoConnected == 2 && flagRelevant_MAC == 1) {
		//low_power_pwm_stop(&low_power_pwm_2);
		low_power_pwm_duty_set(&low_power_pwm_2, 100);
			//nrf_gpio_pin_clear(PIN_OUT);
		nrf_gpio_pin_write(PIN_OUT, 1);
		interruptSeconds = 0;
		flagRelevant_MAC = false;
	}	 
	
	if (scanSeconds == scanTime) {
		sd_ble_gap_scan_stop();
	}

	if (scanSeconds >= (scanTime + noScanTime)) {
		contador_dispositivos = 0;
		scan_start();
		scanSeconds = 0;
	}
}