pwm stop is not working

RE: pwm stop is not working

Hung Bui — Fri, 23 Oct 2015 13:10:50 GMT

@Inspectron: Isn't it in pwm_start() you call app_pwm_enable() ?

How did you setup the ADC ? I don't see any relation between them, except if you use PPI with the ADC. Have you tried the patch I provided above ?

RE: pwm stop is not working

Inspectron — Fri, 23 Oct 2015 08:02:32 GMT

@Hung Bui: I tried to avoid disable and enable function for the pwm. When I stop the pwm, I will just set the duty cycle to 0%. And when I start the pwm, the duty cycle will be set to 90%. The problem is, once I call pwm_start(), the adc wont measure anymore. And if I work with enable and disable, then is the adc always working. How is that possible? As I see the app_pwm_disable function wont stop the pwm signal. Only if I call nrf_drv_gpiote_out_task_disable then the pwm will be stopped

RE: pwm stop is not working

Hung Bui — Thu, 22 Oct 2015 10:50:49 GMT

@Inspectron: I tried here but couldn't recreate the issue. I saw an issue when enable 2 PWM channels that the second channel got inverted after disable-enable but not with 1 channel. Attached is the example modified from ble_app_template SDK 8.1. Please try and let me know the result. ble_app_template - PWM - 1Channel.zip

EDIT:

I got here a patch for the issue with the 2nd channel and the uninit-init issue (instead of disable-enable), it's made for SDK 9.0 but you can follow to modify the file for SDK v8.x: app_pwm_patched.c

RE: pwm stop is not working

Inspectron — Tue, 20 Oct 2015 13:55:23 GMT

No it wont change anything. I added pwm_irq_enable(p_instance); in the app_pwm_enable() function. And the problem is not to start the pwm. The problem is when I want to stop the pwm. But the strange thing is, if I change the switch position and then call pwm_stop function, then it will work. Because in my program, I can start and stop the pwm over a switch/BLE. And this is working like it should.

RE: pwm stop is not working

Stefan Birnir Sverrisson — Tue, 20 Oct 2015 13:31:55 GMT

Hi Inspectron

Check if the solution on this thread helps