#include<avr/io.h>

#define __STDIO_FDEVOPEN_COMPAT_12 

#include<stdio.h>
#include<stdlib.h>



char g_aMemory[256];

int usart_putchar(char c)
{
   if(c=='\n')
      usart_putchar('\r');
   
   loop_until_bit_is_set(UCSRA,UDRE);
   UDR=c;
   
   return 0;
}

int usart_getchar(void)
{
   loop_until_bit_is_set(UCSRA,RXC);
   return UDR;
}



void io_init(void)
{
   UCSRB=_BV(RXEN)|_BV(TXEN);
   UBRRL=25;  //9600 baud 6MHZ:38 4MHZ:25
      
   fdevopen(usart_putchar,usart_getchar,0);
}

int main(void)
{
   char *p;
   int i;
   char c;
   
   io_init();
   __malloc_heap_start=g_aMemory;
   __malloc_heap_end=g_aMemory+256;
   
   while(1)
   {
      p=malloc(100);
      if(p!=0)
      {
	 for(i=0;i<100;i++)
	    p[i]=i;
	 for(i=0;i<100;i++)
	    printf("%d\n",p[i]);
	 free(p);
      }
      else
	 printf("memory alloc fail!\n");
      scanf("%c",&c);
   }
}