Finding rise time and amplitude

Other Hardware 3rd Party Boards
14

you could feed the signal to a digital pin to detect edges and to an analogue pin to read voltage level
on a rising edge read the ADC? e.g.

#define PB0 16
volatile int pwm_value = 0;
volatile int prev_time = 0;
volatile float voltage=0.0;

void setup() {
  Serial.begin(115200);
  analogReadResolution(12);

  // when pin D2 goes high, call the rising function
  attachInterrupt(PB0, rising, RISING);
}

void loop() {
  if (pwm_value > 0) {
    Serial.println(pwm_value);
    Serial.printf("voltage %f\n", voltage);
    delay(1000);
  }
}

void rising() {
  attachInterrupt(PB0, falling, FALLING);
  prev_time = micros();
  voltage= analogRead(34) * 3.3/4096;  // read the input pin
}

void falling() {
  attachInterrupt(PB0, rising, RISING);
  pwm_value = micros() - prev_time;
  //Serial.println(pwm_value);
}

the serial monitor displays

voltage 2.457275
50002
voltage 2.506421
50002
voltage 2.501587
50002
voltage 2.501587

the oscilloscope says the voltage is 2.7volts the signal generator says it is 2.6volts