[SOLVED] Atmega64 USART Problem

[rongo024]

I have written a code for avr atmega64 USART communication but it is not working in hardware. But if I test this code(after making hex) in proteus it works.
my code:

#include <avr/io.h>
#define F_CPU 8000000UL
#include <util/delay.h>
#include <string.h>

#define baudrate_1 9600UL
#define baudrate_0 4800UL

#define ubrrval_1 (((F_CPU)/(baudrate_1*16UL))-1)
#define ubrrval_0 (((F_CPU)/(baudrate_0*16UL))-1)


volatile unsigned char m1[]="baud_4800";

void com_init_1(void)//communication initialization
{
    UBRR1H=ubrrval_1>>8;
    UBRR1L=ubrrval_1;
    UCSR1C|=(1<<USBS1)|(1<<UCSZ11)|(1<<UCSZ10);
   UCSR1B|=(1<<TXEN1)|(1<<RXEN1);
}

void com_init_0(void)
{

    UBRR0H=ubrrval_0>>8;
    UBRR0L=ubrrval_0;
    UCSR0C|=(1<<USBS0)|(1<<UCSZ01)|(1<<UCSZ00);
   UCSR0B|=(1<<TXEN0)|(1<<RXEN0)|(1<<RXCIE0);
}

unsigned char uartgetc0(void)
{
   while(!(UCSR0A & (1<<RXC0))) ;
   return UDR0;
}

unsigned char uartgetc1(void)
{
   while(!(UCSR1A & (1<<RXC1))) ;
   return UDR1;
}

void uartgets1(void)
{
   unsigned char i=0;
   unsigned char c;
   for(i=0;;i++)
   {
      c=uartgetc1();
   }

}
void uartgets0(void)
{
   unsigned char i=0;
   unsigned char ch;
   for(i=0;;i++)
   {
      ch=uartgetc0();
   }   
}
void uartputc0(unsigned char data)
{
   while ( !( UCSR0A & (1<<UDRE0)) )  ;
   UDR0 = data;
   _delay_ms(100);
   
}
void uartputc1(unsigned char data)
{
   while ( !( UCSR1A & (1<<UDRE1)) )  ;
   UDR1 = data;
   _delay_ms(100);
   
}
void uartputs0(unsigned char m[], unsigned char len)
{
   unsigned char i=0;
   for(i=0; i<len; i++)
   {
      uartputc0(m[i]);
   }           
}
void uartputs1(unsigned char m[], unsigned char len)
{
   unsigned char i=0;
   for(i=0; i<len; i++)
   {
      uartputc1(m[i]);
   }           
}


int main(void)

{
   DDRE &= ~(1<<PE0);
   DDRE |= (1<<PE1);
   DDRD &= ~(1<<PD2);
   DDRD |= (1<<PD3);
   com_init_0();
   com_init_1();
   sei();

   while(1)
   {
      uartputs0("4800",4);
      uartputc0('m');
      _delay_ms(1000);
      uartputs1("9600",4);
      _delay_ms(1000);
      uartputc1('m');
      _delay_ms(1000);      
   }

return 0;
}

To check whether the RX and TX pin is not damaged I wrote a simple i/o operation code

   DDRE = 0xFF;
   DDRD = 0xFF;
   
   while(1)
   {
      PORTE = 0x00;
      PORTD = 0x00;
      _delay_ms(1000);
      PORTE = 0xFF;
      PORTD = 0xFF;
      _delay_ms(1000);
   }

and check voltage at these pins using voltmeter and this value alternates periodically as the code says.

So, now what is the problem with my code for usart communication? I am using WINAVR2010.

 

[Tahmid]

Hi,
What are you using in hardware, HyperTerminal? If so, then check your hyperterminal settings, eg baud rate, stop bits, etc.

Hope this helps.
Tahmid.

 

[rongo024]

Actually there is a mistake. Atmega64 is shipped with mega103 compatibility mode where you are allowed to use only USART1. USART0 cannot be used. Here I am using USART0. Naturally I am not getting any USART data from USART0. After removing mega103 compatibility it works fine.