NRF51 pwm accuaracy

RE: NRF51 pwm accuaracy

Sigurd — Thu, 27 Oct 2016 12:55:07 GMT

Are you able to measure the period of the PWM from the nRF51 using the scope? If so you can calculate what frequency the nRF51 is producing.

RE: NRF51 pwm accuaracy

Ron — Thu, 27 Oct 2016 12:35:09 GMT

As I said in my question, I'm using a scope. Was my post hard to understand?

RE: NRF51 pwm accuaracy

Sigurd — Thu, 27 Oct 2016 11:44:47 GMT

What are you using to see/measure the the signals? oscilloscope ? logic analyzer?

RE: NRF51 pwm accuaracy

Ron — Wed, 26 Oct 2016 19:37:31 GMT

As I said in my question, I am seeing a signal come out. When I compare to a 120Hz signal generated by a signal generator, I see that it's going a lot faster than the "120 Hz" from the nrf51. I'm using app_pwm interface to create my pwms.

RE: NRF51 pwm accuaracy

Sigurd — Mon, 24 Oct 2016 17:30:26 GMT

You are not getting any pwm signal at all? Have you enabled the pwm? app_pwm_enable(&PWM1) What timer are you using when creating the PWM instance?

RE: NRF51 pwm accuaracy

Ron — Mon, 24 Oct 2016 17:20:39 GMT

120 hz so 8333 us period and 50% duty cycle.

RE: NRF51 pwm accuaracy

Sigurd — Mon, 24 Oct 2016 17:18:25 GMT

Ok, in that case nothing else should be using P0.05. What period are you using when calling APP_PWM_DEFAULT_CONFIG_1CH() ? What duty cycle are using? Feel free to upload the code you are using.

RE: NRF51 pwm accuaracy

Ron — Mon, 24 Oct 2016 16:45:05 GMT

what would be using P0.05? I don't initialize anything else on that pin nor do i use bsp

RE: NRF51 pwm accuaracy

Sigurd — Mon, 24 Oct 2016 07:34:20 GMT

Could you try another pin, in case P0.05 is used by something else.

RE: NRF51 pwm accuaracy

Ron — Fri, 21 Oct 2016 20:04:53 GMT

No it's not the dk. I'm using singal channel pwm and P0.05

RE: NRF51 pwm accuaracy

Sigurd — Fri, 21 Oct 2016 07:25:19 GMT

Is this a 51-dk? The scope is unable to tell you the PWM frequency ? What pins are you using to output the PWM signal?