NRF52 mbed PWM limited frequency

Other Hardware 3rd Party Boards
1

Hi! I'm trying to get between 1-2 MHz hardware PWM output using the Xiao NRF52840 on mbed.
Using the NRF52_mbed_pwm library I can only get up to 500 kHz.
So I've tried to switch to non-mbed and used adafruit hwpwm.

void setup()
{  
  HwPWM0.addPin(3);

  // Enable PWM modules with 15-bit resolutions(max) but different clock div
  HwPWM0.begin();
  HwPWM0.setResolution(2);
  HwPWM0.setClockDiv(PWM_PRESCALER_PRESCALER_DIV_1); // freq = 16Mhz

  const int maxValue = bit(2) - 1;
  HwPWM0.writePin(3,maxValue/2);

}

By changing the prescaler division and PWM resolution I can even get 5.3 MHz, which is I believe the practical maximum I can get from this chip.

Anyone managed to create this on mbed? I've tried but couldn't find the parameters for changing the prescaler and resolution.

Thanks.

2

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.