Convert Mega sketch to Giga ISR Timer issue

Using Arduino Programming Questions
1

So I have a sketch for mega (and other boards) and I want to use it on a Giga Board. At verification, I got errors about ISR(TIMER1_OVF_vect:

error: expected constructor, destructor, or type conversion before '(' token

  • ISR(TIMER1_OVF_vect)*

The code:

// SET UP interrupt timer  
  #if defined(BOARD_UNO) || defined(BOARD_MEGA) || defined(BOARD_GIGA)

    TCCR1A = 0;
    TCCR1B = _BV(WGM13);
  
    ICR1 = (F_CPU / 4000000) * TIME_CHUNK; // goes twice as often as time chunk, but every other event turns off pins
    TCCR1B &= ~(_BV(CS10) | _BV(CS11) | _BV(CS12));
    TIMSK1 = _BV(TOIE1);
    TCCR1B |= _BV(CS10);

  #elif defined(BOARD_101)

    CurieTimerOne.start(25, &updateStepDirection);

  #endif
}

#if defined(BOARD_101)
void updateStepDirection(void)
{
#else
ISR(TIMER1_OVF_vect)
{
#endif

I do net really got a idea how to solve this any push in the right direction?

2

If a sketch uses methods to access the hardware of a specific microcontroller - such as writing to registers or using interrupts - such code cannot simply be transferred to a different type of controller, the program will have to be completely rewritten.

Arduino Mega based on AVR mcu family, but the Giga has a STM32 controller. The code you shown is incompatible with STM32 core.

1 Like
3

By the way, is the Arduino Giga define in the line below was in the original code

or you added it yourself?

The combination of BOARD_MEGA and BOARD_GIGA in the same preprocessor directive looks as nonsense for me....

1 Like
4

Indeed.

Probably should be something like

// SET UP interrupt timer  
  #if defined(BOARD_UNO) || defined(BOARD_MEGA) 

    TCCR1A = 0;
    TCCR1B = _BV(WGM13);
  
    ICR1 = (F_CPU / 4000000) * TIME_CHUNK; // goes twice as often as time chunk, but every other event turns off pins
    TCCR1B &= ~(_BV(CS10) | _BV(CS11) | _BV(CS12));
    TIMSK1 = _BV(TOIE1);
    TCCR1B |= _BV(CS10);

  #elif defined(BOARD_101)

    CurieTimerOne.start(25, &updateStepDirection);

  #elif defined(BOARD_GIGA)

    // Put STM32-specific stuff here

  #endif

I would always include a #else to catch any missing or incorrect preprocessor definition; eg,

  :
  :
  #elif defined(BOARD_GIGA)

    // Put STM32-specific stuff here

  #else

    #error "Unsupported board."

  #endif
1 Like
5

Yes, i have added this myself. But as I understand it is better to start writing this sketch only for Giga instead of changing the sketch to add the Giga as well. Later if everything works it can be possible to add the board selection.

6

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