Using the four PWM that are suppose to able to work with each hardware PWM!

[Mike_Learning]

I am able to use the 2 channel mode of each PWM giving me a total of six PWM that I can set individual duty cycle PWM!

I now find I need 8 PWM with individual duty cycles! Can anyone point me in the direction has sample code for using them?

 /**  Config is for PWM2 using both PWM channels on pins 24 and 25 with a frequency of 1/(20000uS) = 50Hz   */
     app_pwm_config_t pwm_config1 = {
          .pins              = {24, 25},
          .pin_polarity      = {APP_PWM_POLARITY_ACTIVE_HIGH, APP_PWM_POLARITY_ACTIVE_LOW},
          .num_of_channels   = 2,
          .period_us         = 20000L
      };

And this is were I write the values to the PWM!

while (app_pwm_channel_duty_set(&PWM1, 0, val1) == NRF_ERROR_BUSY); 
   while (app_pwm_channel_duty_set(&PWM1, 1,val2) == NRF_ERROR_BUSY);

Thanks!

[Edvin]

Hello,

What happens if you try to add the last two PWMs the way that you already added the 6 that you currently have?

BR,

Edvin

[Mike_Learning]

This is what I changed it to!

 app_pwm_config_t pwm_config = {
          .pins              = {22, 23, 26},
          .pin_polarity      = {APP_PWM_POLARITY_ACTIVE_HIGH, APP_PWM_POLARITY_ACTIVE_LOW},
          .num_of_channels   = 3,
          .period_us         = 20000L
      };

It locks up when it gets to.

The program fails to responded. And when I try to disconnect from the Nordic UART program the Red connect led stays on solid red. If I comment out this line everything runs!

 while (app_pwm_channel_duty_set(&PWM1, 2, val);

[Edvin]

Hello,

Each app_pwm can have maximum 2 channels. 

You may haven't noticed, but your application asserts because app_pwm_channel_duty_set() -> app_pwm_channel_duty_ticks_set() asserts if channel is greater than or equal to APP_PWM_CHANNELS_PER_INSTANCE, which is 2. 

If you need 8 PWMs you have two options as I see it. Both are described in this post:

https://devzone.nordicsemi.com/f/nordic-q-a/44084/control-6-channel-pwm-at-the-same-time-which-can-modify-duty-cycle-by-app_timer/172846#172846

Best regards,

Edvin

[Edvin]

By the way, you can also use 4 timers and 4 app_pwm instances by using the example that you are already using, but it is very resourceful, and running it, I see a bit of flickering on the LEDs, due to CPU interrupt collisions. I don't know how sensitive the devices you are controlling with your PWM are.

Best regards,

Edvin

[Mike_Learning]

How do you do this? I am using a nRF52832 and it only has the 3 pwm's!