I’m trying to get PWM on PA3 of the Fez Duino but something’s not right.
WHen I put my scope on PA3, i’m not getting any 8MHZ signal, its just noise.
var pwmController = PwmController.FromName(SC20100.Timer.Pwm.Controller2.Id);
pwmController.SetDesiredFrequency(8 * 1000 * 1000);
var clockChannel = pwmController.OpenChannel(SC20100.Timer.Pwm.Controller2.PA3);
clockChannel.SetActiveDutyCyclePercentage(0.5);
Debug.WriteLine($"PWM Frequency: {pwmController.ActualFrequency} Hz");
clockChannel.Start();
Sigh. I pulled out my whole Oscilloscope for this.
Since I’m here.
I’m getting quite a lot of ringing on the PWM output to the powerStep01 drivers.
ChatGPT recommended an in-series 33-ohm resistor, which was difficult to install, btw.
Should I try to jerry-rig a variable resistor until the signal looks square, or is assuming 33 ohms enough?
Does that value change as I chain more PowerStep01 boards together?
Wiring that 33ohm resistor might be the “bane of my existence” Can that PA3 pin be floated (i.e. disconnected) so that I can use PA0 to provide the PWM 8MHZ signal and just jumper the resistor across?
Make the pin an input with no pull is same as floating
I think so but please check the schematics
