AVR Z-LINK®

usart.c File Reference

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Detailed Description

This files contains the functions for initializing and sending data using the USART0 of the AVR microcontroller.

Application note:

AVR414: User's Guide - ATAVRRZ502 - Accessory Kit

Documentation

For comprehensive code documentation, supported compilers, compiler settings and supported devices see readme.html

Author:

Atmel Corporation: http://www.atmel.com
Support email: avr@atmel.com

Name

Revision

1.2

RCSfile

callbacks.c,v

Date

2006/09/15 17:02:19

Definition in file usart.c.

#include "usart.h"

Include dependency graph for usart.c:

Go to the source code of this file.

Functions
void	uartInitialization (const baudRate_t rate)
	Initialize USART0 8-N-1.
void	uartSendSymbol (const uint8_t symbol)
	Send one symbol on the serial line.

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Function Documentation

void uartInitialization

(

const baudRate_t

rate

)

Initialize USART0 8-N-1.

Parameters:

rate

Baudrate to run the USART0 at. The tested rates are: 9600, 19200 and 38400.

Definition at line 39 of file usart.c.

References ENABLE_RECEIVE_COMPLETE_INTERRUPT, ENABLE_RECEIVER, and ENABLE_TRANSMITTER.

Referenced by serialInterfaceInitialization().

                                                {
  
  //Initialize USART module.
  UBRR0H = 0x00;
  UBRR0L = rate;
  
  //Enable USART transmitter module. Always on.
  ENABLE_RECEIVER;
  ENABLE_TRANSMITTER;
        
  //8-N-1.
  UCSR0C |= ( 1 << UCSZ01 ) | ( 1 << UCSZ00 ); 
  
  ENABLE_RECEIVE_COMPLETE_INTERRUPT;
        
  return;
}

void uartSendSymbol

(

const uint8_t

symbol

)

Send one symbol on the serial line.

This function passes one symbol (8 bits) to the USART module on the AVR.

Note:

serialInterfaceInitialization must be called first.

Parameters:

symbol

Symbol to be sent.

Definition at line 66 of file usart.c.

Referenced by sendSymbol().

                                           {
  
        //Wait until the USART module is ready to
        //transmit a new symbol.
        for( ; !( UCSR0A & ( 1 << UDRE0 ) ); ){
    
        ;
        }
        
        //Put symbol in data register.
        UDR0 = symbol;
  
        return;
}