I have a configuration problem, I’m trying to adapt the atmega323 port -> to  Atmega644 but
when I try to run 2 tasks does not work. My code #include <stdlib.h>
#include <avr/interrupt.h> #include “FreeRTOS.h”
#include “task.h” /*—————————————
* Implementation of functions defined in portable.h for the AVR port.
*—————————————*/ /* Start tasks with interrupts enables. */
#define portFLAGS_INT_ENABLED ( ( portSTACK_TYPE ) 0x01 ) /// ….>  ????? ist a register?? or interrupt mask register?? /* Hardware constants for timer 1. */
#define portCLEAR_COUNTER_ON_MATCH ( ( unsigned char ) 0x08 )
#define portPRESCALE_64 ( ( unsigned char ) 0x03 )
#define portCLOCK_PRESCALER ( ( unsigned long ) 64 )
#define portCOMPARE_MATCH_A_INTERRUPT_ENABLE                   ( ( unsigned char ) 0x02 ) //ForCOMPARE_MATCH_A_INTERRUPT_ENABLE ATM644 I need your help. Thanks Guys

I used the following code when using a ATmega1284P and a ATmega1281:

/* Start tasks with interrupts enables. */
#define portFLAGS_INT_ENABLED                   ( ( portSTACK_TYPE ) 0x80 )
/* Hardware constants for timer 1. */
#if !(__AVR_ATmega1284P__ || __AVR_ATmega1281__)
#define portCLEAR_COUNTER_ON_MATCH              ( ( unsigned char ) 0x08 )
#define portPRESCALE_64                         ( ( unsigned char ) 0x03 )
#define portCLOCK_PRESCALER                     ( ( unsigned long ) 64 )
#define portCOMPARE_MATCH_A_INTERRUPT_ENABLE    ( ( unsigned char ) 0x10 )
#else
#define portCLEAR_COUNTER_ON_MATCH              ( 1<<COM1A1 )
#define portPRESCALE_1024                       ( (1<<CS12) | (1<<CS10) )
#define portPRESCALE_256                        ( 1<<CS12 )
#define portPRESCALE_64                         ( (1<<CS11) | (1<<CS10) )
#define portCLOCK_PRESCALER                     ( 64 )
#define portCOMPARE_MATCH_A_INTERRUPT_ENABLE    ( 1<<OCIE1A )
#define TIMSK                                   TIMSK1
#endif

I also change the code for prvSetupTimerInterrupt()

static void prvSetupTimerInterrupt( void )
{
unsigned long ulCompareMatch;
unsigned char ucHighByte, ucLowByte;
    /* Using 16bit timer 1 to generate the tick.  Correct fuses must be
    selected for the configCPU_CLOCK_HZ clock. */
    ulCompareMatch = configCPU_CLOCK_HZ / configTICK_RATE_HZ;
    /* We only have 16 bits so have to scale to get our required tick rate. */
    ulCompareMatch /= portCLOCK_PRESCALER;
    /* Adjust for correct value. */
    ulCompareMatch -= ( unsigned long ) 1;
    /* Setup compare match value for compare match A.  Interrupts are disabled 
    before this is called so we need not worry here. */
    ucLowByte = ( unsigned char ) ( ulCompareMatch & ( unsigned long ) 0xff );
    ulCompareMatch >>= 8;
    ucHighByte = ( unsigned char ) ( ulCompareMatch & ( unsigned long ) 0xff );
    OCR1AH = ucHighByte;
    OCR1AL = ucLowByte;
    // Generate tick pulses on PD5
    //DDRD |= (1<<PD5);
    TCCR1A = (0<<COM1A1) | (0<<COM1A0)  //  normal operation (or toggle OC1A = PD5 on compare match)
           | (0<<COM1B1) | (0<<COM1B0)  //  normal operation
           | (0<<WGM11)  | (0<<WGM10);  //  CTC (together with WGM12 and WGM13)
                                        //  TOP is OCR1A
    /* Setup clock source and compare match behaviour. */
    // ucLowByte = portCLEAR_COUNTER_ON_MATCH | portPRESCALE_64;
    // TCCR1B = ucLowByte;
    TCCR1B = (0<<ICNC1)  | (0<<ICES1)   // Noise Canceler: Off
           | (0<<WGM13)  | (1<<WGM12)
           | (0<<CS12)   | (1<<CS11) | (1<<CS10);  // no prescaler, source = sys_clk
    TCCR1C = (0<<FOC1A)  | (0<<FOC1B);   //  reserved in PWM, set to zero
    /* Enable the interrupt - this is okay as interrupt are currently globally
    disabled. */
    ucLowByte = TIMSK;
    ucLowByte |= portCOMPARE_MATCH_A_INTERRUPT_ENABLE;
    TIMSK = ucLowByte;
}

I tested this code with a STK500. Hope this helps Bernd