I have ATMEGA 16 i want to serial communication to pc terminal.

[Pulkit Prajapati]

I have ATMEGA 16 i want to serial communication to pc terminal.I got garbage value at any baudrate.and in simulation nothing display in virtual terminal….

following is my code

 

#define BAUD_PRESCALE 79

#include<avr/io.h>

#include<util/delay.h>

void usart_init();

void usart_putch(unsigned char send); 

int main()

{ unsigned char send;

_delay_ms(50); // delay of 50 mili seconds

usart_init(); // initialization of USART

while(1)

{

send =8;

usart_putch(send); // send data back to the PC (HyperTerminal)

}

return 0;

} 

void usart_init()

{

UCSRB |= (1 << RXEN) | (1 << TXEN); // Turn on the transmission and reception circuitry

UCSRC |= (1 << URSEL) | (1<<USBS) | (1 << UCSZ0) | (1 << UCSZ1); // Use 8-bit character sizes

  UBRRH = (BAUD_PRESCALE >> ;

UBRRL = BAUD_PRESCALE; // Load lower 8-bits of the baud rate value.. // into the low byte of the UBRR register

// Load upper 8-bits of the baud rate value..// into the high byte of the UBRR register

} 

void usart_putch(unsigned char send)

{

while ((UCSRA & (1 << UDRE)) == 0){}; // Do nothing until UDR is ready..

// for more data to be written to it

UDR = send; // Send the byte 

}

 

 

 

sir plz help me quick….thanx in advance..

[jagadeesh]

Hi..

check this functions once….

 

 

     //UART0 initialize

     // desired baud rate: 9600

     // actual: baud rate:9600(0.2%)

     // char size: 8 bit

     // parity: Disabled

void UART_Init(void)

{

     // At 4MHz oscillator

     int baud = 25;

 

     /* Set baud rate */

     UBRRH = (unsigned char)(baud>>;

     UBRRL = (unsigned char)baud;

 

     /* Enable Receiver and Transmitter */

     //RXCIE TXCIE UDRIE RXEN TXEN UCSZ2 RXB8 TXB8

     UCSRB = 0;

     UCSRB = (1<<RXCIE)| (1<<RXEN) | (1<<TXEN);

 

     /* Set frame format: 8data, 1stop bit */

     //URSEL UMSEL UPM1 UPM0 USBS UCSZ1 UCSZ0 UCPOL

     UCSRC = 0;

     UCSRC = (1<<URSEL)| (1<<UCSZ1)| (1<<UCSZ0);

}

 

 

void UART_TransmitByte( unsigned char data )

{

      /* Wait for empty transmit buffer */

      while ( !( UCSRA & (1<<UDRE)) );

     /* Put data into buffer, sends the data */

     UDR = data;

}

 

 

[Pulkit Prajapati]

it show me for p-> x…

[AJISH ALFRED]

May be hardware issue. Please post your circuit diagram

[Pulkit Prajapati]

 

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