Interrupt Timer library or native code for Giga R1?

Official Hardware Mega GIGA R1 WiFi
1

Giga uses the same STM32H747XI microcontroller found on the Arduino Portenta H7, but the Portenta Timer library doesn't support the Giga board.

Thanks

2

Cannot comment about Portenta but I can compile interrupt driven code for GIGA. I cannot upload using IDE 2.0.3 under Ubuntu 22.10. (wary about the bug reports on 2.0.4)

Regards.

3

Thanks for the reply. My Pin interrupts compile (attachInterrupt), but my timer interupt does not compile.

void startTimer() {
  cli();                      //stop interrupts for till we make the settings
  /*1. First we reset the control register to amke sure we start with everything disabled.*/
  TCCR1A = 0;                 // Reset entire TCCR1A to 0 
  TCCR1B = 0;                 // Reset entire TCCR1B to 0
 
  /*2. We set the prescalar to the desired value by changing the CS10 CS12 and CS12 bits. */  
  TCCR1B |= B00000100;        //Set CS12 to 1 so we get prescalar 256  
  
  /*3. We enable compare match mode on register A*/
  TIMSK1 |= B00000010;        //Set OCIE1A to 1 so we enable compare match A 
  
  /*4. Set the value of register A to 31250*/
  OCR1A = 31250;             //Finally we set compare register A to this value  
  sei();                     //Enable back the interrupts
}
ISR(TIMER1_COMPA_vect){
  TCNT1  = 0;                  //First, set the timer back to 0 so it resets for next interrupt
  panelTimerInterrupt();
}
4

Hello @simons007,

Sorry for the late response. This stuff is way out of my league. Several years ago I tried to get more stable and longer duration timer code and ran into similar code. Not having any meaningful microcontroller experience I gave up.

I've been digging through STMicroelectronics datasheets. Your sample may help me to follow along in a few months! Thanks for posting it.

Regards.

5

We can take inspiration from the source "Tone.cpp " to obtain a first solution. The code bellow wait a command type by exemple 100g to start a timer calling a sample counter at the gived frequency.
/*
trial
inspired by "Tone.cpp"
This example code is in the public domain

*/
#include "Arduino.h"
#include "pinDefinitions.h"
#include "mbed.h"

using namespace std::chrono_literals;
using namespace std::chrono;

long visuc = 0, ovisuc, os;
int freq = 1;
int val;

class NSTimer {
mbed::Ticker ticker; // calls a callback repeatedly with a timeout

public:
bool state = false;

void start(int freq) {
  ticker.attach(mbed::callback(this, &NSTimer::count), 1000000us / freq  );
  visuc = 0;
  state = true;
}

void count(void) {
  //ini=10;
  visuc++;
}

void stop(void) {
  ticker.detach();
  state = false;
}

};

NSTimer timer1;

void setup() {
Serial.begin(9600);

while (!Serial && millis() < 5000);

delay(100);

Serial.println("BONJOUR (setup)");

}

// Task count between call
void loop() {

long s = millis() / 1000;

if (os != s) {
if (visuc != ovisuc) {
Serial.print("counter: "); Serial.println(visuc);
ovisuc = visuc;
}
os = s;
}

if (Serial.available()) {
char c = Serial.read();

if (c == 'd' || c =='g' ) {
  if (val == 0) val = 1;
  Serial.print("FREQ:"); Serial.println(val);
  if (timer1.state) timer1.stop();
  timer1.start(val);
  val = 0;
}
if (c == 'f' || c =='s' )       timer1.stop();
if (c == 'c')       val = 0;
if (c >= '0' && c <= '9' ) {
  val = val * 10 + c - '0';
  Serial.print("valc:"); Serial.println(val);
}

}

}
cordially,