APP_BUTTON Event Not Firing

[Chris Pope]

Sorry but I've been stuck on this for a few days now and I have to give up and ask for help.

I'm attempting to set LED0 when BUTTON_0 is pressed and LED1 when BUTTON_1 is pressed but the button_event_handler(...) is never called.

I initialize APP_TIMER, APP_GPIOTE, APP_BUTTON and call the app_button_enable() function but still cannot detect button presses.

I know the code is downloaded correctly to the flash because I can debug it and also have UART working so I get output.

BTW I'm using GCC + Eclipse with the NRF51822 Eval Kit.

Can anyone give me a hint what I'm doing wrong?

Thank you.

Hello World.zip

[Ole Morten]

The app_button module uses app_timer to do button debouncing. When using app_timer without the softdevice, you have to manually start the low-frequency clock, for example like this:

static void lfclk_config(void)
{
    NRF_CLOCK->LFCLKSRC             = (CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos);
    NRF_CLOCK->EVENTS_LFCLKSTARTED  = 0;
    NRF_CLOCK->TASKS_LFCLKSTART     = 1;
    while (NRF_CLOCK->EVENTS_LFCLKSTARTED == 0)
    {
        //Do nothing.
    }
    NRF_CLOCK->EVENTS_LFCLKSTARTED = 0;
}

This is from the RTC example of the SDK.

[Guest]

Thank you Ole! I would not have figured that out. I guess it's better to load and initialize the softdevice even though I don't use it just so I don't run into situations like this.

Thanks again, Chris