AVR C statement run time test program source code

 

 

Core code:

/********** AVR Run Time Test Program**********
* Version..........: 1.0
* Author..........: Chen Lidong
* Target.......: ATmega128
* File Name..........: main.c
* Compiler..........: IAR for AVR V5.5
* Created on.....: 2010.10.14
* Last Modified on.....: 2010.10.14
******************************************/
#include "main.h"

int putchar(int c)
{
    return uart_putchar(c);
}

volatile unsigned int TimerOverflowCount = 0;

int main(void)
{
    unsigned long TimerCount = 0;
    
    UART_Init();
    printf("*********** Run Time Test***********\r\n");
    printf("Build: %s %s\r\n", __DATE__, __TIME__);
    printf("Clock frequency: %fMHz\r\n", (float)F_CPU / 1000000);

    TCCR1B_CS10 = 1; // Timer 1 enables counting, no frequency division
    TIMSK_TOIE1 = 1; // Timer 1 enables overflow interrupt
    __enable_interrupt(); // Total interrupt enable
    TimerOverflowCount = 0; // Overflow count cleared
    TCNT1 = 0; // Counter cleared


/* Insert the code to be run here*/ /
* Code starts*/
    _delay_us(123456);
/* Code ends*/

    TCCR1B_CS10 = 0; // Timer 1 stops counting and takes 3 clock cycles
    TimerCount = TCNT1;
    TimerCount |= ((unsigned long)TimerOverflowCount << 16);
    TimerCount -= 3; // Timer off time
    TimerCount -= (50 * TimerOverflowCount); // Overflow interrupt time

    printf("Consumed clock cycles...: %ld 0x%lx\r\n", TimerCount, TimerCount);
    printf("Consumed time (unit: s): %lf\r\n", (double)1 * TimerCount / F_CPU);
    printf("Consumed time (unit: ms): %lf\r\n", (double)1000 * TimerCount / F_CPU);
    printf("Consumed time (unit: us): %lf\r\n", (double)1000000 * TimerCount / F_CPU);
    printf("Consumed time (unit: ns): %lf\r\n", (double)1000000000 * TimerCount / F_CPU);

    while (1);
}

#pragma vector = TIMER1_OVF_vect
__interrupt void Timer1_Overflow(void)
{
    TimerOverflowCount++;
}

 

 

Test results: