RE: Control two pwms in sequence

Edvin — Wed, 26 Aug 2020 13:58:22 GMT

Hello,

You have probably considered this, but it is not possible to change out the color LED with a normal LED, so that you can use only one channel for that one as well? In that case, you would only need 4 channels -> 1 PWM instance. Or alternatively, use one pin to power all 3 colors of the color LED. But I assume you want to be able to control the colors as well, so therefore you need 6 channels:

I agree that it is not efficient to use thw while (!nrfx_pwm_is_stopped());

Before the call to nrf_drv_pwm_simple_playback(), you probably have a call looking something like this:

nrf_drv_pwm_init(&m_pwm0, &config0, my_callback_handler);

(my_callback_handler probably has a different name)

But this event handler is an event handler that will be called when the sequence is finished. Look at how this is used in the SDK\examples\peripheral\pwm_driver example, in the demo1() function.

Now, if you use NRF_DRV_PWM_FLAG_STOP in nrf_drv_pwm_simple_playback, you will get an event in the event handler. NB: You will get more, so you need to check the event type:

static void my_callback_handler(nrf_drv_pwm_evt_type_t event_type)
{
    if (event_type == NRFX_PWM_EVT_STOPPED)
    {
        NRF_LOG_INFO("PWM sequence done");
        start_next_sequence(); //custom function starting the next pwm sequence.
    }
}

Try this, and let me know if it doesn't work.

Best regards,

Edvin