Cannot clear 'wake on GPIO' input sense pin

[dcollier8]

The wake on GPIO is working all the time now.

Unfortunately, I want to disable it except when needed.

Here is the scenario:

1. Power up, pushbutton pin senses clicks to allow pairing or to clear pairing, depending on number of clicks.
2. On timeout, I want to start SYSTEMOFF for a low power mode, with a wakeup on GPIO, it works fine:

    nrf_gpio_cfg_sense_input(PIN_GPIO_WAKEUP, BUTTON_PULL, NRF_GPIO_PIN_SENSE_LOW);

    // Workaround for PAN_028 rev1.1 anomaly 22 - System: Issues with disable System OFF mechanism

    nrf_delay_ms(1);

    NRF_POWER->SYSTEMOFF = 0x1;

 

1. When it wakes on the GPIO Pushbutton click, I then want the pushbutton to return to working as in step 1 above. I have used several attempts, all do not disable the wake on GPIO from happening while running, eg. When I click the pushbutton it resets the CPU, and starts up again. Here are the things I have tried:

nrf_gpio_cfg_sense_set(PIN_GPIO_WAKEUP,NRF_GPIO_PIN_NOSENSE);

or

nrf_gpio_cfg_sense_input(PIN_GPIO_WAKEUP, BUTTON_PULL, NRF_GPIO_PIN_NOSENSE);

or

nrf_gpio_input_disconnect(PIN_GPIO_WAKEUP);

or

setting the wake on GPIO to another unused pin

or

    nrf_gpio_cfg_input(PIO_PUSHBUTTON, NRF_GPIO_PIN_NOPULL);

 

Do you know of any way to disable wake on GPIO after its been setup,

so that I can use the pushbutton when the unit is running, since I don’t need to wake it up when its running ?!!

The wake on GPIO code is here:

    // power down CPU in specified power mode: wakeup on GPIO (pushbutton)
    nrf_gpio_cfg_sense_input(PIN_GPIO_WAKEUP, NRF_GPIO_PIN_PULLDOWN, NRF_GPIO_PIN_SENSE_HIGH);
    // Workaround for PAN_028 rev1.1 anomaly 22 - System: Issues with disable System OFF mechanism
    nrf_delay_ms(1);
    NRF_POWER->SYSTEMOFF = 0x1;

//on wake up code to config pins:

void setup_pw_pins()
{
    nrf_gpio_cfg_input(PIN_GPIO_WAKEUP, NRF_GPIO_PIN_NOPULL);
    //1st reset GPIO by setting cfg to: Input with the input buffer disconnected, no pull, standard drives, and pin sensing disabled
    nrf_gpio_cfg_input(PIO_SEL_PIN_0, NRF_GPIO_PIN_NOPULL);        //BIT0
    nrf_gpio_cfg_input(PIO_SEL_PIN_1, NRF_GPIO_PIN_NOPULL);        //BIT1
    nrf_gpio_cfg_input(PIO_SEL_PIN_2, NRF_GPIO_PIN_NOPULL);        //BIT2
    nrf_gpio_cfg_input(PIO_SEL_PIN_3, NRF_GPIO_PIN_NOPULL);        //BIT3
    nrf_gpio_cfg_input(PIO_PUSHBUTTON, NRF_GPIO_PIN_NOPULL);
    nrf_gpio_cfg_input(PIO_INTERRUPT, NRF_GPIO_PIN_NOPULL);

    nrf_gpio_cfg(PIO_LED_RED, NRF_GPIO_PIN_DIR_INPUT, NRF_GPIO_PIN_INPUT_DISCONNECT, NRF_GPIO_PIN_NOPULL, NRF_GPIO_PIN_H0D1, NRF_GPIO_PIN_NOSENSE);
    nrf_gpio_cfg(PIO_LED_BLUE, NRF_GPIO_PIN_DIR_INPUT, NRF_GPIO_PIN_INPUT_DISCONNECT, NRF_GPIO_PIN_NOPULL, NRF_GPIO_PIN_H0D1, NRF_GPIO_PIN_NOSENSE);

    nrf_gpio_cfg_input(PIO_3V_nTX_EN, NRF_GPIO_PIN_NOPULL);
    nrf_gpio_cfg_input(PIO_MUX_DISABLE, NRF_GPIO_PIN_NOPULL);

    nrf_gpio_cfg_input(PIO_MUX_B, NRF_GPIO_PIN_NOPULL);
    nrf_gpio_cfg_input(PIO_MUX_A, NRF_GPIO_PIN_NOPULL);
    nrf_gpio_cfg_input(PIO_5V_nTX_EN, NRF_GPIO_PIN_NOPULL);
    nrf_gpio_cfg_input(PIO_5V_nRX_EN, NRF_GPIO_PIN_NOPULL);
    nrf_gpio_cfg_input(PIO_SUSTAIN, NRF_GPIO_PIN_NOPULL);
    nrf_gpio_cfg_input(PIO_USB_EN, NRF_GPIO_PIN_NOPULL);

    nrf_delay_ms(50); //settle

    //2nd config as desired:
    nrf_gpio_cfg_input(PIO_SEL_PIN_0, NRF_GPIO_PIN_PULLUP);        //BIT0
    nrf_gpio_cfg_input(PIO_SEL_PIN_1, NRF_GPIO_PIN_PULLUP);        //BIT1
    nrf_gpio_cfg_input(PIO_SEL_PIN_2, NRF_GPIO_PIN_PULLUP);        //BIT2
    nrf_gpio_cfg_input(PIO_SEL_PIN_3, NRF_GPIO_PIN_PULLUP);        //BIT3
    nrf_gpio_cfg_input(PIO_PUSHBUTTON, NRF_GPIO_PIN_NOPULL);
    nrf_gpio_cfg_input(PIO_INTERRUPT, NRF_GPIO_PIN_NOPULL);
    //bit 5 is battery detect

    nrf_gpio_cfg(PIO_LED_RED, NRF_GPIO_PIN_DIR_OUTPUT, NRF_GPIO_PIN_INPUT_DISCONNECT, NRF_GPIO_PIN_NOPULL, NRF_GPIO_PIN_H0D1, NRF_GPIO_PIN_NOSENSE);
    nrf_gpio_cfg(PIO_LED_BLUE, NRF_GPIO_PIN_DIR_OUTPUT, NRF_GPIO_PIN_INPUT_DISCONNECT, NRF_GPIO_PIN_NOPULL, NRF_GPIO_PIN_H0D1, NRF_GPIO_PIN_NOSENSE);

    nrf_gpio_cfg_output(PIO_3V_nTX_EN);
    nrf_gpio_cfg_output(PIO_MUX_DISABLE);

    // Unlock the NFC pins as GPIO
    uint32_t nfcpins = (*(uint32_t *)0x1000120C);
    if (nfcpins & 1) {
        nrf_nvmc_write_word(0x1000120C, 0xFFFFFFFE);
        NVIC_SystemReset();
    }

    nrf_gpio_cfg_output(PIO_MUX_B);
    nrf_gpio_cfg_output(PIO_MUX_A);
    nrf_gpio_cfg_output(PIO_5V_nTX_EN);
    nrf_gpio_cfg_output(PIO_5V_nRX_EN);

    nrf_gpio_cfg_output(PIO_SUSTAIN);
    nrf_gpio_cfg_output(PIO_USB_EN);

Definition:

#define PIN_GPIO_WAKEUP PIO_INTERRUPT        /**< Wake up pin number. */

or

#define PIN_GPIO_WAKEUP PIO_PUSHBUTTON        /**< Wake up pin number. */

[dcollier8]

Is there a trick to starting the softdevice after a NRF_POWER->SYSTEMOFF = 0x1; ?

I would be OK with starting like a cold boot up, I am not preserving RAM.

[dcollier8]

The current error after wake from GPIO is:

On initial startup the first call to SOFTDEVICE_HANDLER_INIT subroutine has a variable called: power_clock_isr_enabled, which is false. On the wake from GPIO restart, the power_clock_isr_enabled is now true. I cannot find anywhere in the code where this is set to true. Is this a problem ? When its true it stops NVIC_DisableIRQ  and then starts the NVIC_EnableIRQ, before the error happens. The Pushbutton is caught by the GPIOTE_IRQHandler. Any relationship ? The Pushbutton click is not getting to GPIOTE_IRQHandler due to the error causing trap and reset:

#ifndef DEBUG
    NVIC_SystemReset();

Hope this helps.

[dcollier8]

Found the issue was in Makefile:

CFLAGS += -DCONFIG_GPIO_AS_PINRESET

and

ASMFLAGS += -DCONFIG_GPIO_AS_PINRESET