Wake up from low-power mode with GPIO

[Norman Hsu]

We want to use GPIO_12 as a wake up pin. (High -> open uart, Low -> close uart)
Also, we have a timer and timeout set to 500ms.
When we pull GPIO_12 to high, it seems not trigger an event to wakp up from idle_state_handle()/nrf_pwr_mgmt_run() immediately.
Always need to wait timer timeout to trigger an event and run uart_init();
Any additional settings need to configure for GPIO_12?

// Enter main loop.
for (;;)
{
    if ((UartStatus == UART_ENABLE) && (nrf_gpio_pin_read(12) == 0))
    {
        nrf_gpio_cfg_sense_input(12, NRF_GPIO_PIN_PULLDOWN, NRF_GPIO_PIN_SENSE_HIGH);
        UartStatus = UART_DISABLE;
        app_uart_close();
    }

    idle_state_handle(); //Enter nrf_pwr_mgmt_run();

    if ((UartStatus == UART_DISABLE) && (nrf_gpio_pin_read(12) == 1))
    {
        uart_init();
        UartStatus = UART_ENABLE;
        nrf_gpio_cfg_sense_input(12, NRF_GPIO_PIN_NOPULL, NRF_GPIO_PIN_SENSE_LOW);
    }
}

Thank you in advance.

[Vidar Berg]

Hello,

The GPIO sense signal must be connected to the GPIOTE peripheral to generate an interrupt you can wake up on. I recommend you use the GPIOTE driver to set this up.

Best regards,

Vidar

[Norman Hsu]

Hi Vidar,

After configuring the GPIOTE, the interrupt is work now.

Thank you for guiding.