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uart.h

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/*! \file uart.h \brief UART driver with buffer support. */
//*****************************************************************************
//
// File Name    : 'uart.h'
// Title        : UART driver with buffer support
// Author       : Pascal Stang - Copyright (C) 2000-2002
// Created      : 11/22/2000
// Revised      : 02/01/2004
// Version      : 1.3
// Target MCU   : ATMEL AVR Series
// Editor Tabs  : 4
//
// This code is distributed under the GNU Public License
//      which can be found at http://www.gnu.org/licenses/gpl.txt
//
//*****************************************************************************

#ifndef UART_H
#define UART_H

#include "global.h"
#include "buffer.h"

//! default baud rate
//! can be changed by using uartSetBaudRate()
#define UART_DEFAULT_BAUD_RATE  9600

// buffer memory allocation defines
// buffer sizes
#ifndef UART_TX_BUFFER_SIZE
#define UART_TX_BUFFER_SIZE     0x0040  ///< number of bytes for uart transmit buffer
#endif
#ifndef UART_RX_BUFFER_SIZE
#define UART_RX_BUFFER_SIZE     0x0040  ///< number of bytes for uart receive buffer
#endif

// define this key if you wish to use
// external RAM for the UART buffers
//#define UART_BUFFER_EXTERNAL_RAM
#ifdef UART_BUFFER_EXTERNAL_RAM
    // absolute address of uart buffers
    #define UART_TX_BUFFER_ADDR 0x1000
    #define UART_RX_BUFFER_ADDR 0x1100
#endif

// type of interrupt handler to use
// *do not change unless you know what you're doing
// Value may be SIGNAL or INTERRUPT
#ifndef UART_INTERRUPT_HANDLER
#define UART_INTERRUPT_HANDLER  SIGNAL
#endif

// compatibility with most newer processors
#ifdef UCSRB
    #define UCR                 UCSRB
#endif
// compatibility with old Mega processors
#if defined(UBRR) && !defined(UBRRL)
    #define UBRRL               UBRR
#endif
// compatibility with dual-uart processors
// (if you need to use both uarts, please use the uart2 library)
#if defined(__AVR_ATmega128__)
    #define UDR                 UDR0
    #define UCR                 UCSR0B
    #define UBRRL               UBRR0L
    #define UBRRH               UBRR0H
    #define SIG_UART_TRANS      SIG_UART0_TRANS
    #define SIG_UART_RECV       SIG_UART0_RECV
    #define SIG_UART_DATA       SIG_UART0_DATA
#endif
#if defined(__AVR_ATmega161__)
    #define UDR                 UDR0
    #define UCR                 UCSR0B
    #define UBRRL               UBRR0
    #define SIG_UART_TRANS      SIG_UART0_TRANS
    #define SIG_UART_RECV       SIG_UART0_RECV
    #define SIG_UART_DATA       SIG_UART0_DATA
#endif

// functions

//! initializes transmit and receive buffers
// called from uartInit()
void uartInitBuffers(void);

//! initializes uart
void uartInit(void);

//! redirects received data to a user function
void uartSetRxHandler(void (*rx_func)(unsigned char c));

//! sets the uart baud rate
void uartSetBaudRate(u32 baudrate);

//! returns pointer to the receive buffer structure
cBuffer* uartGetRxBuffer(void);

//! returns pointer to the transmit buffer structure
cBuffer* uartGetTxBuffer(void);

//! sends a single byte over the uart
void uartSendByte(u08 data);

//! gets a single byte from the uart receive buffer
// Function returns TRUE if data was available, FALSE if not.
// Actual data is returned in variable pointed to by "data".
// example usage:
// char myReceivedByte;
// uartReceiveByte( &myReceivedByte );
u08 uartReceiveByte(u08* data);

//! returns TRUE/FALSE if receive buffer is empty/not-empty
u08 uartReceiveBufferIsEmpty(void);

//! flushes (deletes) all data from receive buffer
void uartFlushReceiveBuffer(void);

//! add byte to end of uart Tx buffer
void uartAddToTxBuffer(u08 data);

//! begins transmission of the transmit buffer under interrupt control
void uartSendTxBuffer(void);

//! sends a buffer of length nBytes via the uart using interrupt control
u08  uartSendBuffer(char *buffer, u16 nBytes);

#endif

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