i237/src/main.c

#include <stdio.h>
#include <avr/io.h>
#include <util/delay.h>
#define __ASSERT_USE_STDERR
#include <assert.h>
#include "uart.h"

#define BLINK_DELAY_MS 100

int main (void)
{
    /* set pin 3 of PORTA for output*/
    DDRA |= _BV(DDA3);
    /* Init error console as stderr in UART3 and print user code info */
    uart3_init();
    stderr = &uart3_out;
    fprintf(stderr, "Version: %s built on: %s %s\n",
            GIT_DESCR, __DATE__, __TIME__);
    fprintf(stderr, "avr-libc version: %s\n", __AVR_LIBC_VERSION_STRING__);
    /*End UART3 init and info print */
    /* Test assert - REMOVE IN FUTURE LABS */
    char *array;
    uint32_t i = 1;
    extern int __heap_start, *__brkval;
    int v;
    array = malloc( i * sizeof(char));
    assert(array);
    /* End test assert */

    while (1) {
        /* set pin 3 high to turn led on */
        PORTA |= _BV(PORTA3);
        _delay_ms(BLINK_DELAY_MS);
        /* Test assert - REMOVE IN FUTURE LABS */
        /* Increase memory allocated for array by 100 chars
         * until we have eaten it all and print space between Stack and Heap.
         * Thats how assert works in run-time */
        array = realloc( array, (i++ * 100) * sizeof(char));
        fprintf(stderr, "%d ",
                (int) &v - (__brkval == 0 ? (int) &__heap_start : (int) __brkval));
        assert(array);
        /* End test assert */
        /* set pin 3 low to turn led off */
        PORTA &= ~_BV(PORTA3);
        _delay_ms(BLINK_DELAY_MS);
    }
}