Due and PWM resolution

Hardware Arduino Due
1

Hello,

i tried the examples with the analogWriteResolution(12).
The values can be send up to 4095, that's ok.
But the PWM duty cycle changes all 16 values.
That is a very bad resolution.
I checked it with another Due, but it's the same.
I use IDE 1.8.7

Who can help?

2

Can you post the code you used.
All 16 values of what are changed?

3

All 16 values of the A value (0-4095)

const int analogOutPin = 10; 
int A =0;

void setup() {
  // initialize serial communications at 9600 bps:
  Serial.begin(57600);
   analogWriteResolution(12);
   pinMode(analogOutPin, OUTPUT);
}

void loop() {
  A++;
  analogWrite(analogOutPin, A);
  if (A>=4095) {A=0;}
  Serial.println(A);
  delay(50);
}
4

You won't be able to get the maximum resolution with analogWrite() function.

Yu can output a PWM waveform either from the PWM peripheral or the Timer Counter. Search in the DUE sub forum for example sketches.

5

The Due has the same resolution like the Mega?
4096 / 16 = 255
For what is the analogWriteResolution(12) if it's always the same?

6

The resolution depends on the frequency you need. The highest frequency with the maximum resolution (16 bit) is obtained with a frequency of 84 MHz/ 65535 ~ 1282 Hz because de duty cycle can vary between 0 (0%) and 65535 (100%).

7

I give up and prepared a solution with my old MEGA. That program is working with a resolution of 1024 (with changing of the resolution)