NRFX PWM Driver with Zephyr Threads combination

RE: NRFX PWM Driver with Zephyr Threads combination

TGosman — Fri, 31 May 2024 07:50:10 GMT

All Good, I found a solution where i link PPI from the SEQ0END event to trigger the STOP task, so that the sequence can be reset before it is run again. Thank you for your help!

void configurePPI(void){
    uint8_t pwm_stop_ppi_channel;
    nrfx_err_t err = nrfx_gppi_channel_alloc(&pwm_stop_ppi_channel);
    if (err != NRFX_SUCCESS) {
        LOG_ERR("nrfx_gppi_channel_alloc error: %08x", err);
        return;
    }
    nrfx_gppi_channel_endpoints_setup(pwm_stop_ppi_channel,nrfx_pwm_event_address_get(&pwm_instance1, NRF_PWM_EVENT_SEQEND0),
                                  nrf_pwm_task_address_get(pwm_instance1.p_reg,  NRF_PWM_TASK_STOP));

    nrfx_gppi_channels_enable(BIT(pwm_stop_ppi_channel));
}

RE: NRFX PWM Driver with Zephyr Threads combination

Vidar Berg — Fri, 31 May 2024 06:55:58 GMT

Thanks for confirming. Can you upload your code with the current changes so I can have another look at your implementation?

RE: NRFX PWM Driver with Zephyr Threads combination

TGosman — Fri, 31 May 2024 06:38:35 GMT

yes there is no change

RE: NRFX PWM Driver with Zephyr Threads combination

Vidar Berg — Mon, 27 May 2024 08:19:13 GMT

Do you see the same if you comment out the code in your pwm_handler()?

RE: NRFX PWM Driver with Zephyr Threads combination

TGosman — Fri, 24 May 2024 10:37:46 GMT

Hi Vidar,

Thank you for your response, this allows for me to call the playback function within each thread, however my current problem is that the playback function cannot play more than once, and I am unsure if there is anything else I have to do.

For example:

for(int i = 0; i > 0; i++){
    nrfx_pwm_simple_playback(&pwm_instance, &seq_set1, i, NRFX_PWM_FLAG_LOOP);

}

RE: NRFX PWM Driver with Zephyr Threads combination

Vidar Berg — Fri, 24 May 2024 09:51:20 GMT

Hi,

It looks like you are defining multiple driver instances for the same PWM. I suggest moving 'nrfx_pwm_t pwm_instance1 = NRFX_PWM_INSTANCE(PWM_INST_IDX);' to the global scope and then use same 'pwm_instance1' for your pwm functions. I posted another example with PWM here: Softblink in NCS/Zephyr

Best regards,

Vidar