PWM bug - app_pwm_init

[gaminn]

Hello, call of app_pwm_init() function forces logic 1 on PWM enabled pin after advertising timeout expires. Why? It causes my LED to turn completely on after advertising ends.

Please see example project - it is HRS example project from SDK 8, it uses softdevice S110 on pca10028. Only app_pwm_init() function call is added in main function. After the start of program execution, you can see logic zero on P0.8, after the advertising timeout expires, it toggles to logic one. How to avoid that?

ble_peripheral.zip

[gaminn]

Is my pca10028 broken or what? Nobody has the problem with PWM? Do I need to uninit PWM everytime advertising ends? Is this feature and is it documented somewhere?

[Stian Røed Hafskjold]

The chip is put in system off mode after advertising times out.

If you look at the function on_adv_evt() in main.c, you will see that the advertising event BLE_ADV_EVT_IDLE will call the sleep_mode_enter() function which then puts the chip in system off mode.

Try to comment out the err_code = sd_power_system_off(); line and the PWM should still work after advertising stops.

[Luis]

I found same behaviour, PWM pins going HIGH when entering system off. Is this the expected behaviour for some reason? Or is it a bug that will get fixed sometime? Right now I made a workaround unitializing PWM instance, and setting those pins to output low.