RE: Cant run simple PWM output on NRF5340

Michal Obrembski — Fri, 14 Jan 2022 07:06:17 GMT

This is from Nordic SDK:

nrf_pwm_values_t values; ///< Pointer to an array with duty cycle values. This array must be in Data RAM.

/**< This field is defined as an union of pointers

* to provide a convenient way to define duty

* cycle values in various loading modes

* (see @ref nrf_pwm_dec_load_t).

* In each value, the most significant bit (15)

* determines the polarity of the output and the

* others (14-0) compose the 15-bit value to be

* compared with the pulse generator counter. */

So basically youre trying to tell me that they're actually expecting compare value not duty cycle (which normally is denoted in percentage)?
If so, i suggest better naming here

RE: Cant run simple PWM output on NRF5340

PaKa — Thu, 13 Jan 2022 17:57:11 GMT

So a compare value of 50 when the top value is 62 should give a duty cycle around 80% so looks correct (assuming the values are not converted to duty cycle in the driver). If this is correct, set the values.channel to 50% of the initial_config.top_value.