nRF51422 cannot be waken after sleep/wake quite a few times.

[AnthonyThet]

Hi, I am now developing a product which uses nrf51422 chip. In this product, I use buttons to turn on and off (since I don't have hard-power cut off circuit, we use system-off sleep for power off and normal mode for active mode). To turn off the device, users need to press and hold the button for 3seconds (here I just used sd_power_system_off() function to go into system-off sleep mode) and to turn on the device, users need to do the same action. I completed the firmware tested a few times and it was OK. But now we found out that after we turn on/off for a few times (23times for a unit, 50times for another unit,it's inconsistent) , the device cannot be waken up at all. But after I remove the battery and put again (power reset), then it's working again. Does anyone encounter this kind of issue before? Please help me. The device is going to be in production soon and urgently need your help.

here is some details for the device,

MCU - nrf51422

SDK - v11.0.0

SD version - SD130

System-off sleep

            if(Flag.PowerOnOff==1)
            {
                if( nrf_drv_gpiote_in_is_set(SW_PWR_ON_PIN) == false) // if the power on button is pressed
                {
                    for(uint8_t i=0;i<=6;i++)
                    {
                        nrf_delay_ms(500);
                        if( nrf_drv_gpiote_in_is_set(SW_PWR_ON_PIN) == true)
                            break;
                        if( i==6)
                        {
                            TurnOff_LEDs();
                            nrf_delay_ms(10);
    
                           //Disable some interrupt to prevent from waking up
                          nrf_drv_gpiote_in_uninit(SW_EMERGENGY_PIN);
                          nrf_drv_gpiote_in_event_disable(SW_EMERGENGY_PIN);
                          nrf_gpiote_int_disable(SW_EMERGENGY_PIN);
        
                          nrf_drv_gpiote_in_uninit(INT_PIN);
                          nrf_drv_gpiote_in_event_disable(INT_PIN);
                          nrf_gpiote_int_disable(INT_PIN);

                         // Go to system-off mode (this function will not return; wakeup will cause a reset).
                         err_code = sd_power_system_off();
                         APP_ERROR_CHECK(err_code);

                     }
                    }
                }
                
            }

Wake up Check whether from power reset or sleep reset

        if((NRF_POWER->RESETREAS & 0x00010000)== 0x00010000) // If reset from system off mode
        
        {
            if(nrf_drv_gpiote_in_is_set(SW_PWR_ON_PIN)==false)
            {
                for(temp=0;temp<=6;temp++)
                {
                    nrf_delay_ms(500);
                    if(nrf_drv_gpiote_in_is_set(SW_PWR_ON_PIN)==true)
                    {
                        TurnOff_LEDs();
                        
                        //Disable Hi G, Low G and Emergency Interrupt pin to prevent System-off wakeup
                        nrf_drv_gpiote_in_uninit(SW_EMERGENGY_PIN);
                        nrf_drv_gpiote_in_event_disable(SW_EMERGENGY_PIN);
                            
                       
                        nrf_drv_gpiote_in_uninit(INT_PIN);
                        nrf_drv_gpiote_in_event_disable(INT_PIN);
                        
                        NRF_POWER->SYSTEMOFF = 1; // if the power on button is released within 3seconds, goto system off again
                    }
                }
            }
            
        }

[AnthonyThet]

OK Kenneth I will try and get back to you

[AnthonyThet]

Hi Kenneth, I don't know what's wrong with my code, I just tried what you suggested and it bacome even worse. When I tried the below code, my LED will blink twice and the device will go to deepsleep and couldn't be waken up as usual.

static void sleep_mode_enter(void)
{
//uint32_t err_code;
TurnOff_LEDs();
nrf_delay_ms(10);

__disable_irq();

//Disable Hi G, Low G and Emergency Interrupt pin to prevent System-off wakeup
nrf_drv_gpiote_in_uninit(SW_EMERGENGY_PIN);
nrf_drv_gpiote_in_event_disable(SW_EMERGENGY_PIN);
nrf_gpiote_int_disable(SW_EMERGENGY_PIN);

nrf_drv_gpiote_in_uninit(LOWG_INT_PIN);
nrf_drv_gpiote_in_event_disable(LOWG_INT_PIN);
nrf_gpiote_int_disable(LOWG_INT_PIN);

nrf_drv_gpiote_in_uninit(SW_PWR_ON_PIN);
nrf_drv_gpiote_in_event_disable(SW_PWR_ON_PIN);
nrf_gpiote_int_disable(SW_PWR_ON_PIN);

nrf_gpio_cfg_input(SW_PWR_ON_PIN,NRF_GPIO_PIN_PULLUP);
nrf_gpio_cfg_sense_set(SW_PWR_ON_PIN,NRF_GPIO_PIN_SENSE_LOW);

// Go to system-off mode (this function will not return; wakeup will cause a reset).

NRF_POWER->SYSTEMOFF=1;
NVIC_SystemReset();

//APP_ERROR_CHECK(err_code);
}

[AnthonyThet]

Hi Kenneth, sorry for my mistakes. Actually, the code is OK, I mean, the device blinking corretly but still the same issue that it cannot be wakeup after I press the button and put the device into deepsleep.

static void sleep_mode_enter(void)
{
//uint32_t err_code;
TurnOff_LEDs();
nrf_delay_ms(10);

__disable_irq();

//Disable Hi G, Low G and Emergency Interrupt pin to prevent System-off wakeup
nrf_drv_gpiote_in_uninit(SW_EMERGENGY_PIN);
nrf_drv_gpiote_in_event_disable(SW_EMERGENGY_PIN);
nrf_gpiote_int_disable(SW_EMERGENGY_PIN);

nrf_drv_gpiote_in_uninit(LOWG_INT_PIN);
nrf_drv_gpiote_in_event_disable(LOWG_INT_PIN);
nrf_gpiote_int_disable(LOWG_INT_PIN);

nrf_drv_gpiote_in_uninit(SW_PWR_ON_PIN);
nrf_drv_gpiote_in_event_disable(SW_PWR_ON_PIN);
nrf_gpiote_int_disable(SW_PWR_ON_PIN);

nrf_delay_ms(1);

nrf_gpio_cfg_input(SW_PWR_ON_PIN, NRF_GPIO_PIN_PULLUP);
nrf_gpio_cfg_sense_set(SW_PWR_ON_PIN, NRF_GPIO_PIN_SENSE_LOW);
//nrf_gpio_cfg_sense_input(SW_PWR_ON_PIN, NRF_GPIO_PIN_PULLUP, NRF_GPIO_PIN_SENSE_LOW);

// Go to system-off mode (this function will not return; wakeup will cause a reset).
nrf_delay_ms(10);
NRF_POWER->SYSTEMOFF=1;
//sd_power_system_off();
NVIC_SystemReset();

//APP_ERROR_CHECK(err_code);
}

[Kenneth]

Are you able to simplify and share your project to run on nrf51-dk so I can recreate the issue here?

Best regards,
Kenneth

[AnthonyThet]

Hi Kenneth, thanks for the suggestion. I will try to do this but could you also help me how to disconnect BLE and stop advertising properly so that I can also try with system on sleep instead of system off sleep? Thanks.