PWM with soft device

RE: PWM with soft device

Susheel Nuguru — Tue, 21 Jul 2015 06:50:05 GMT

I think it will happen soon, @Krzysztof Chruściński is investigating this. you can find more information here

RE: PWM with soft device

Mohamed O.Abouzeid — Sat, 18 Jul 2015 20:38:57 GMT

I managed on it and it works by enabling only the PWM to one channel & init it then set the duty cycle and uninit it after that, the concept it that I deallocate the resources of PWM (mainly timers) after using it, the problem now it appears to be flashing while changing the duty cycle to control its brigthness, I wonder if I can ask if there are any possibility to make the resources of the PWM independent of the softdevice, I have 3 timers and two RTC, ble uses only 1 timer and the other two timers will be used with the PWM, or if there any example of building the PWM with the RTC

RE: PWM with soft device

Mahesh Venkitachalam — Mon, 13 Jul 2015 10:26:18 GMT

I have simple example below that uses PWM with the Nordic UART Service, using the S110 softdevice. It uses GCC, and the latest 9.0.0 SDK.

github.com/.../nRF51-pwm-test

RE: PWM with soft device

Krzysztof Chruscinski — Mon, 13 Jul 2015 09:39:50 GMT

Hi,

topic is well covered in this thread: https://devzone.nordicsemi.com/question/39809/sometimes-pwm-signal-is-reversed/.

Conclusion: if you take SDK 9.0 and library present there (components/pwm) and use patch provided in the topic above (will be present in next SDK release) you should get reliable output if your period is not too short (issues seen with period 64us, not seen with 128us). I guess that for LED you don't need such short period.

RE: PWM with soft device

Mohamed O.Abouzeid — Mon, 13 Jul 2015 07:52:03 GMT

also I checked the config file it didn't changed at all

RE: PWM with soft device

Mohamed O.Abouzeid — Mon, 13 Jul 2015 07:51:35 GMT

I'm using the nrf51422 a chip with its development kit, the softdevice is 8.0.0 one , it go through the module and set the first value of PWM values then it stop working.

RE: PWM with soft device

Mahesh Venkitachalam — Mon, 13 Jul 2015 06:17:06 GMT

Yes, the directory structure has changed. With 9.0.0 even the Makefile structure has changes.

RE: PWM with soft device

Mahesh Venkitachalam — Mon, 13 Jul 2015 06:01:29 GMT

I don't see a file called nrf_pwm.h. In any case, you don't need to modify the core files to use PWM. You can just do it in the config/nrf_drv_config.h of your project. For example: #define TIMER1_ENABLED 1

RE: PWM with soft device

MANGO — Mon, 13 Jul 2015 05:52:31 GMT

If you are using PWM with SoftDevice, check the nrf_pwm.h .

// Set this to 1 if the application uses a SoftDevice, 0 otherwise
#define USE_WITH_SOFTDEVICE     0

Added : Really? Is that SDK 8.x (config/nrf_drv_config.h)? I use SDK 6.1 & 7.2.

That comment part was written by the Nordic developers.

-Regards

RE: PWM with soft device

Mahesh Venkitachalam — Mon, 13 Jul 2015 04:02:47 GMT

Which hardware (board) and softdevice are you using? Did you try the blinky example with and without softdevice and did that work? Also, please mention your SDK version.

RE: PWM with soft device

Mohamed O.Abouzeid — Sun, 12 Jul 2015 22:25:47 GMT

also I tried to use the nrf_pwm application showed in the last reviews and it doesn't work with the softdevice also