atmega128 pwm uart

#include <avr/io.h>

#include <avr/interrupt.h>

#define BAUD        9600L

#define UBRR_BAUD   ((16000000/(16UL*BAUD))-1)

//function definition

void uart_init(void)

{

UBRR0H |= (uint8_t) (UBRR_BAUD>>8);

UBRR0L |= (uint8_t) (UBRR_BAUD);

UCSR0B |= ((1<<RXCIE0) | (1<<RXEN0)|(1<<TXEN0));    /* Enable receiver */

UCSR0C |= ((1<<UCSZ10) | (1<<UCSZ00)); //8 bits

}

void pwm_init(void)

{  DDRB=0x00;

   DDRB|=(1<<PB7)|(1<<PB6)|(1<<PB5) | (1<<PB4);

   TCCR0|=(1<<WGM00)|(1<<COM01)|(1<<CS01);

   TCCR2|=(1<<WGM20)|(1<<COM21)|(1<<CS20);

   TCCR1A|= (1<<WGM10)|(1<<COM1A1)|(1<<COM1B1);

   TCCR1B|= (1<<CS10);

   OCR0=128;

   OCR1A=128;

   OCR1B=128;

   OCR2=128; 

}

void put_uart_c(uint8_t c)

{

while(!( UCSR0A & (1<<UDRE0)));

   UDR0 = c;

return;

}

uint8_t get_data(void)

{

  while(!(UCSR0A & (1<<RXC0)));

  return UDR0;

}

ISR (USART0_RX_vect)

{

    char c=UDR0;

   put_uart_c(c);

}

int main(void){

   sei();

   uart_init();

   pwm_init();

   put_uart_c('H');

while(1);

return 0;

}