Dephasage on PWM

RE: Dephasage on PWM

Sigurd — Tue, 02 Jul 2019 15:42:46 GMT

For PWM synchronization use-cases, it’s generally better to use the PWM driver (easier to use PPI with the PWM driver / dedicated PWM peripheral). The connect GPIOTE event with PWM TASKS_SEQSTART[0] task. Here is link to PPI driver doc. If you don't use the driver, it's also possible to do it bare-metal, see this example.

RE: Dephasage on PWM

EliasAd — Mon, 01 Jul 2019 14:53:29 GMT

The PWM Library

RE: Dephasage on PWM

Sigurd — Mon, 01 Jul 2019 14:47:56 GMT

Are you using the PWM driver or the PWM library ?

RE: Dephasage on PWM

EliasAd — Mon, 01 Jul 2019 14:21:10 GMT

 if(!nrf_gpio_pin_latch_get(PINTRANSZERO)){ //Sense_LOW of the pin
    if((previous_state)){
      count++; //count number of falling edge
    }
    nrf_gpio_pin_set(LED3);
    previous_state = 0;
 }else{
    nrf_gpio_pin_clear(LED3);
    previous_state = 1;
 }
 nrf_gpio_pin_latch_clear(PINTRANSZERO);

I done this for detect a falling edge.

Where can I find an example of the configuration of the start.

RE: Dephasage on PWM

Sigurd — Mon, 01 Jul 2019 13:52:01 GMT

[quote user="EliasAd"]The PWM will continue from it previous state or restart as a new one ?[/quote]

It will restart, but you can configure if it should start high or low.

[quote user="EliasAd"]It almost work[/quote]

Almost ?

Could you post some code on how you did it ?

RE: Dephasage on PWM

EliasAd — Mon, 01 Jul 2019 12:45:40 GMT

I just tried it. It almost work. Do you know if I disable the pwm and then enable it, The PWM will continue from it previous state or restart as a new one ?

RE: Dephasage on PWM

Sigurd — Mon, 01 Jul 2019 12:33:10 GMT

Hi,

An option could be to capture the PWM from the Arduino on one of the GPIOs on the nRF52, then use PPI to start the PWM on the nRF52 when you get a GPIOTE event(falling or raising edge).