Test data received by interruption

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Test data received by interruption

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Started 3 years ago by Bernardo769
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Bernardo769
Member

If you have specific tests, I can do it, even if I do not control everything...

Posted 3 years ago #
gbulmer
Moderator

Bernardo769 - what are you asking? I am not clear.

A simple technique to generate consistently timed events, potentially useful to test interrupts, is to use a signal from a timer. Once set, the timer will be relatively stable (using the MCU's crystal), and consistent.

A very simple approach, which needs very little software is feed a timers PWM output into a pin, and that gives a signal source which can trigger an interrupt.
By adjusting the duration of the timer count, you can sweep it across a range of frequencies in 1/72,000,000 increments.
By using two timer outputs from the same timer, you can trigger two pins, and by adjusting the PWM value for each, you can set which pin changes first and second.

Posted 3 years ago #
Bernardo769
Member

My lack of experience forces me to ask the obvious questions for you.
I'll use a second Maple to generate a PWM signal clean.
I will keep you informed of the outcome.

Posted 3 years ago #
gbulmer
Moderator

Bernardo769 - You can use a second Maple, but you don't need a second Maple.

Take a PWM output pin, and connect it back into the pin you are trying to test. The timers are pure hardware, so once the values for frequency and 'pwmWrite' ratio are set, they don't generate interrupts, or run any software.

Posted 3 years ago #

Bernardo769
Member

Hi,
I used a second Maple with this sketch :

#include <Servo.h>

#define PoloDigi4 26
Servo myservo;

void setup(){
  pinMode(BOARD_LED_PIN, OUTPUT);
    // Servo :
    myservo.attach(PoloDigi4);
}

// Move the servo to one extreme then to the other
void loop(){
  togglePin(BOARD_LED_PIN);
  for (int valServo=1000; valServo<2000; valServo++){
    myservo.writeMicroseconds(valServo);  // OK
    delay(1);
  }
  togglePin(BOARD_LED_PIN);
  for (int valServo=2000; valServo>1000; valServo--){
    myservo.writeMicroseconds(valServo);  // OK
    delay(1);
  }
}

With a connection between Maple1-pin20 to Maple2-pin26

I still have the problem :
http://bernard.o.perso.neuf.fr/Electronic/MAPLE/BugRC/sourceMaplePWM.jpg

If there is no other solution, I'll put up a soft filter to eliminate and correct the incorrect values.

Test data received by interruption

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