app pwm nrf52

RE: app pwm nrf52

Stefan Birnir Sverrisson — Thu, 13 Oct 2016 10:32:43 GMT

I have not yet progressed on this towards SDK 11 or RTOS. I will postpone that further if you have adequate solution with the nrf_drv_pwm. Is the nrf_drv_pwm adequate for your scenario?

RE: app pwm nrf52

polarstate — Thu, 13 Oct 2016 01:20:53 GMT

Shortly means approximately one second.

How did your experiment with SDK 11 and FreeRTOS go? I moved to using the nrf_drv_pwm library and now have 6 channels working.

RE: app pwm nrf52

Stefan Birnir Sverrisson — Mon, 10 Oct 2016 16:57:40 GMT

QFAAB0 is revision 1 nRF52 IC, so that should be fine. What do you mean that it disconnects shortly after connection? Does "shortly" mean seconds or minutes?

I have set up 6 pwm library channels with ble_app_hrs for SDK 12.1.0 and duty cycle update every 10ms. It seems to be working fine, i.e. I can connect and stay connected for a long time. I will try to reproduce this tomorrow with SDK 11 and RTOS

RE: app pwm nrf52

polarstate — Fri, 07 Oct 2016 17:02:55 GMT

Thanks for your response Stefan.

I am using SDK v11.
I believe I'm using v1.1 marking is QFAAB0
On your suggestion I moved the while loops out of the main context but the same disconnection error persists.
I adapted the HRS + RTOS example to use the code from the PWM example.
I have also attempted to put the change in PWM in a different thread with lower priority and have the changes happen without input from the BLE characteristics. This causes the device to disconnect shortly after connection.

RE: app pwm nrf52

Stefan Birnir Sverrisson — Fri, 07 Oct 2016 11:24:01 GMT

First thoughts: As I see it, you are setting PWM duty cycles in a BLE interrupt handler. You are busy waiting several times for the PWM callback. How long does that take? While you wait, you are blocking all other BLE callbacks. Try to put your code into main context instead, with e.g. using the scheduler. Another experiment could be to disable the CPU while you wait for the ready_flag, like

while(!ready_flag) { power_manage(); }

Are you adding the PWM to any standard SDK example? What SDK version is your code based on? Are you using nRF52832 rev 1?