Added assert test to main.c with stderr debug console output

src/main.c

@@ -1,18 +1,46 @@
+#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  1000
+#define BLINK_DELAY_MS 100
 
 int main (void)
 {
-    /*  set pin 25 of PORTB for output*/
+    /* 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 25 high to turn led on  */
+        /* set pin 3 high to turn led on */
         PORTA |= _BV(PORTA3);
         _delay_ms(BLINK_DELAY_MS);
-        /*  set pin 25 low to turn led off */
+        /* 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);
     }