Programming Problems 1. Write C code to setup the AVR USART peripheral for commu

Question

Programming Problems 1. Write C code to setup the AVR USART peripheral for communication using the following configuration and then send the character A' once. The A VR has arn 8MHz system clock. Write only the code needed to configure the peripheral and send the character, do not write an entire C program. i. Asynchronous communication ii. 8 bit characters iii. Receiver and transmitter enabled iv. Odd parity v. Normal communication speed vi. Baud rate of 19,200 bits per second vii. 2 stop bits (10 Points)

Explanation / Answer

#include <avr/io.h>

#define FOSC 16000000// Clock Speed
#define BAUD 19200
#define MYUBRR FOSC/16/BAUD-1

void USART_Init( unsigned int ubrr );
void USART_Transmit( unsigned char data );
unsigned char USART_Receive( void );

int main( void )
{
   unsigned char str[18] = " Explore Embedded";
   unsigned char strLenght = 18;
   unsigned char i = 0;
  
   USART_Init ( MYUBRR );
   //USART_Transmit('S' );  
   while(1)
   {
       USART_Transmit( str[i++] );
       if(i >= strLenght)
       i = 0;
      
   }
   return(0);
}

void USART_Init( unsigned int ubrr )
{
   /* Set baud rate */
   UBRR0H = (unsigned char)(ubrr>>8);
   UBRR0L = (unsigned char)ubrr;
   /* Enable receiver and transmitter */
   UCSR0B = (1<<RXEN)|(1<<TXEN);
   /* Set frame format: 8data, 2stop bit */
   UCSR0C = (1<<USBS)|(3<<UCSZ0);
}

void USART_Transmit( unsigned char data )
{
   /* Wait for empty transmit buffer */
   while ( !( UCSR0A & (1<<UDRE)) )
   ;
   /* Put data into buffer, sends the data */
   UDR0 = data;
}

unsigned char USART_Receive( void )
{
   /* Wait for data to be received */
   while ( !(UCSR0A & (1<<RXC)) )
   ;
   /* Get and return received data from buffer */
   return UDR0;
}

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