n-AN36 change the Button to PWM

[Inspectron]

I would like to modificate the LED Button application example. The LED characteristic should stay as it is, only the Button characteristic should be changed. I want to use the button characteristic to send the value of a pwm signal. When the device is in connection, it should always send the value of the pwm signal.

Goal of the changes :

1.)

The button_state value should be send all the time and not only when the button is pressed. I`m not sure, but I think that the button will be detected in the button_event_handler. If my presumption is true, how can I change that the value of the button_state will always be send?

2.)

The value of the button_state should have a range from 0-100 and not only 1 or 0. Where in the code the value of the button_state will be set ?

And do I have to change configuration of the value?

EDIT

main.c

[Inspectron]

In the pwm_analyzer project are only 4 functions:timer1_init, GPIOTE_IRQHandler,gpiote_init and ppi_init. The timer1_init and GPIOTE_IRQHandler function I simply copied from the pwm_analyzer project and added it to my project.

For ppi_init function i did a few changes:

err_code = sd_ppi_channel_assign(5, &NRF_GPIOTE->EVENTS_IN[0], &NRF_TIMER1->TASKS_CAPTURE[0]);

err_code = sd_ppi_channel_assign(4, &NRF_GPIOTE->EVENTS_IN[1], &NRF_TIMER1->TASKS_CAPTURE[1]);

But what I have to change on the gpiote_init function?

[Stefan Birnir Sverrisson]

You need to set the GPIOTE priority explicitly with

    NRF_GPIOTE->INTENSET = (GPIOTE_INTENSET_IN1_Enabled << GPIOTE_INTENSET_IN1_Pos);
sd_nvic_SetPriority(GPIOTE_IRQn, NRF_APP_PRIORITY_LOW);  
sd_nvic_EnableIRQ(GPIOTE_IRQn);

but otherwise the GPIOTE code should be fine as the GPIOTE peripheral is not blocked by the softdevice, see S110 Softdevice Specification v1.3, table 23

[Inspectron]

Yes the gpiote_init function seems to be ok. I think the problem is the GPIOTE_IRQHANDLER. Because in the LED Button application example the GPIOTE_IRQHANDLER is in the app_gpiote.c file handled. How I can add the GPIOTE_IRQHANDLER function to the LED Button appliaction example? Can I keep the GPIOTE_IRQHANDLER function in the app_gpiote.c file or do I have to remove it?

[Stefan Birnir Sverrisson]

Hi

Sorry, my bad. Yes, in the ble_app_lbs you use the app_gpiote library which primarily allows many users to use the GPIOTE interrupt. To obtain the button function, the ble_app_lbs uses app_button library which requires app_timers library and app_gpiote. So if you exclude the app_gpiote and app_button functions and includes from your project and comment out the calls to gpiote_init and buttons_init in the main function, then it should compile.

[Inspectron]

Hi Stefan

Since I removed the app_button and app_gpiote files I cannot set the leds. Also the connection is strange: I see my nRF51 DK and can connect with the Chip, but after about 20 seconds it disconnects and then is the Chip not visible anymore.

Is it possible that the LEDs are related to the Buttons?(in ble_app_lbs example)

And why do the Chip disconnect after about 20 seconds connection?

It should work without app_button and app_gpiote file?