How to use more that 4 buttons??

RE: How to use more that 4 buttons??

Sigurd — Tue, 27 Sep 2016 11:32:13 GMT

GPIOTE_CONFIG_NUM_OF_LOW_POWER_EVENTS is the number of low-power input pins, so you should only set it to the actually number of low-power input pins you use.

RE: How to use more that 4 buttons??

sosse — Tue, 27 Sep 2016 11:15:07 GMT

Thank for your answer. Is there any max number of it?? I can also set it as the whole 32 pin as GPIOTE_CONFIG_NUM_OF_LOW_POWER_EVENTS ?? And I wonder that how much the power consumption is increased by increasing the number of it.

RE: How to use more that 4 buttons??

Sigurd — Tue, 27 Sep 2016 09:11:29 GMT

Error code 4 is «NRF_ERROR_NO_MEM”, and is thrown when channel_port_alloc(...) is called and there are no more available GPIOTE channels that could be assigned to the button. In sdk_config.h, you have to increase GPIOTE_CONFIG_NUM_OF_LOW_POWER_EVENTS to 5.

RE: How to use more that 4 buttons??

sosse — Tue, 27 Sep 2016 01:18:36 GMT

Of course, I defined BUTTON_5 as my custom board pin. But when I add new button as

 {BUTTON_5, APP_BUTTON_ACTIVE_LOW, NRF_GPIO_PIN_PULLUP, button_handler}

I got error from "app_button_init" err_code is 4. Someone can tell me why??

RE: How to use more that 4 buttons??

Bill Siever — Mon, 26 Sep 2016 13:29:20 GMT

The "BSP" is the board support package for Nordic's developer boards. Since boards have limited numbers of buttons only a few buttons are defined, which is why it doesn't go up to BUTTON_5. The BUTTON_X #defines just designate which gpio pin will be used for the button. In the code you've included p_button is an array and you can put as many things in it as you'd like (up to the max of using all the available IO pins). To add another button just add a new item, like:

{YOUR_BUTTONS_GPIO, APP_BUTTON_ACTIVE_LOW, NRF_GPIO_PIN_PULLUP, button_handler}

Where "YOUR_BUTTONS_GPIO" is replaced with a GPIO pin number (or defined constant for the pin number).