Invert PWM Behaviour

RE: Invert PWM Behaviour

phipi — Tue, 12 Dec 2017 15:48:37 GMT

Fantastic, thanks!

RE: Invert PWM Behaviour

Sigurd — Tue, 12 Dec 2017 15:42:05 GMT

Hi,

The the most significant bit[15] in the sequence duty cycle values sets the polarity. See this and this link.

So if you want seq_value 0 to correspond to 0 V, you need to set bit 15 to 1. E.g. by using bitwise OR.

seq_values->channel_0 = duty_cycle | 0x8000;

NRF_DRV_PWM_PIN_INVERTED only determines the idle state polarity, the 15th bit in the sequence value determines the polarity when playing the sequence

RE: Invert PWM Behaviour

phipi — Tue, 12 Dec 2017 15:32:36 GMT

I'm using the hardware driver (nrf_drv_pwm)

RE: Invert PWM Behaviour

Sigurd — Tue, 12 Dec 2017 11:33:32 GMT

Hi,

Are you using the PWM library(implemented using GPIOTE,TIMER and PPI) or the PWM driver(dedicated PWM hardware) ?