[Icc-avr] Help with callback functions on ICCAVR 7

[Modeltech]

This works for me on ATMega8, 16, 168, .

 

// Event type

typedef unsigned int event_Event_t;

 

// Event handler type

typedef event_Event_t (*event_EventHandler_t)(event_Event_t);

 

.

 

// Private variables

 

static event_EventHandler_t eventHandler;       // Placeholder for system
tick eventhandler

 

.

 

// Scheduler that will be called cyclically

static event_Event_t Scheduler(event_Event_t event)

{

  .

 

            return EVENT_NONE_E;

}

 

 

/*!

 
****************************************************************************
**

 * \brief Timer 2 interrupt service routine

 *

 * \par Description:

 * Interrupt handler for timer 2 compare. The interrupt generates a time
tick

 * to execute any real-time scheduled tasks. These tasks must be defined in

 * the event handler registered for the system tick.

 
****************************************************************************
**

 */

#pragma interrupt_handler TimerCompareIsr:iv_TIMER2_COMP

static void TimerCompareIsr(void)

{

    if (0 != eventHandler)

        eventHandler(SYSTICK_TIMETICK_E);

}

 

// Public variables

 

// Public functions

 

/*!

 
****************************************************************************
**

 * \brief Initialize system tick

 *

 * \par Description:

 * Initializes timer and interrupt settings to generate a periodic interrupt

 * to implement a system tick.

 *

 * \param divisor Terminal count value for divisor timer (compare mode)

 * \param eventHandler Pointer to callback function, called when timer

 *                     reaches compare value

 * \retval  0 OK

 * \retval -1 ERROR (No eventhandler specified)

 
****************************************************************************
**

 */

int systick_Init(unsigned char        divisor,

                 event_EventHandler_t handler )

{

    // Install eventhandler

    if (0 == handler)

        return -1;

    eventHandler = handler;

 

    TCCR2 = 0x00;                               // Stop timer2

    OCR2  = --divisor;                          // Set timer2 resolution
(TOP)

    TCCR2 = 0b00001011;                         // Timer2 clock = clk/32,

                                                // CTC mode (auto reload),
start timer

    TIMSK |= BIT(OCIE2);                        // Enable timer2 interrupt
(output compare)

 

    return 0;

}

 

 

Somewhere in your application's initialization:

 

    // Initialize scheduler

    resultCode |= systick_Init(RAILIO_SCHEDULER_TIMER_DIVISOR, Scheduler);

 

 

Hope this helps.

 

Rudy

 

  _____  

From: icc-avr-bounces at imagecraft.com [mailto:icc-avr-bounces at imagecraft.com]
On Behalf Of Alain van Hanegem
Sent: zaterdag 29 september 2007 12:32
To: icc-avr at imagecraft.com
Subject: [Icc-avr] Help with callback functions on ICCAVR 7

 

Hi all,

 

What is the correct way of using callback functions for ICCAVR V7 ?

 

This for example using a timer array where I want different timer callback
methods.

 

Does anyone have a 8 line code example on how to define them and call them?

 

 

Project is for an ATMEGA2560

 

 

Thanks,

Alain

 

 

 

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