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/************************************************************************* |
Title: Interrupt UART library with receive/transmit circular buffers |
Author: Peter Fleury <pfleury@gmx.ch> http://jump.to/fleury |
File: $Id: uart.c,v 1.6.2.2 2009/11/29 08:56:12 Peter Exp $ |
Software: AVR-GCC 4.1, AVR Libc 1.4.6 or higher |
Hardware: any AVR with built-in UART, |
License: GNU General Public License |
|
DESCRIPTION: |
An interrupt is generated when the UART has finished transmitting or |
receiving a byte. The interrupt handling routines use circular buffers |
for buffering received and transmitted data. |
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The UART_RX_BUFFER_SIZE and UART_TX_BUFFER_SIZE variables define |
the buffer size in bytes. Note that these variables must be a |
power of 2. |
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USAGE: |
Refere to the header file uart.h for a description of the routines. |
See also example test_uart.c. |
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NOTES: |
Based on Atmel Application Note AVR306 |
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LICENSE: |
Copyright (C) 2006 Peter Fleury |
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This program is free software; you can redistribute it and/or modify |
it under the terms of the GNU General Public License as published by |
the Free Software Foundation; either version 2 of the License, or |
any later version. |
|
This program is distributed in the hope that it will be useful, |
but WITHOUT ANY WARRANTY; without even the implied warranty of |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
GNU General Public License for more details. |
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*************************************************************************/ |
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#include <avr/io.h> |
#include <avr/interrupt.h> |
#include <avr/pgmspace.h> |
#include <string.h> |
#include <stdbool.h> |
#include "uart1.h" |
#include "../main.h" |
#include "../bluetooth/bluetooth.h" |
#include "../tracking/tracking.h" |
// |
// constants and macros |
// |
#if defined HWVERSION1_3W || defined HWVERSION3_9 |
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// size of RX/TX buffers |
#define UART_RX_BUFFER_MASK ( UART_RX_BUFFER_SIZE - 1) |
#define UART_TX_BUFFER_MASK ( UART_TX_BUFFER_SIZE - 1) |
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#if ( UART_RX_BUFFER_SIZE & UART_RX_BUFFER_MASK ) |
#error RX buffer size is not a power of 2 |
#endif |
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#if ( UART_TX_BUFFER_SIZE & UART_TX_BUFFER_MASK ) |
#error TX buffer size is not a power of 2 |
#endif |
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// ATmega with two USART |
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#define ATMEGA_USART1 |
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#define UART1_STATUS UCSR1A |
#define UART1_CONTROL UCSR1B |
#define UART1_DATA UDR1 |
#define UART1_UDRIE UDRIE1 |
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// |
// module global variables |
// |
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uint8_t receiveNMEA = false; |
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#if defined( ATMEGA_USART1 ) |
static volatile unsigned char UART1_TxBuf[UART_TX_BUFFER_SIZE]; |
static volatile unsigned char UART1_RxBuf[UART_RX_BUFFER_SIZE]; |
static volatile unsigned char UART1_TxHead; |
static volatile unsigned char UART1_TxTail; |
static volatile unsigned char UART1_RxHead; |
static volatile unsigned char UART1_RxTail; |
static volatile unsigned char UART1_LastRxError; |
volatile uint16_t UART1_RxError; |
#endif |
|
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void SetBaudUart1(uint8_t Baudrate) |
{ |
switch (Baudrate) |
{ |
case Baud_2400: uart1_init( UART_BAUD_SELECT(2400,F_CPU) ); break; |
case Baud_4800: uart1_init( UART_BAUD_SELECT(4800,F_CPU) ); break; |
// case Baud_9600: uart1_init( UART_BAUD_SELECT(9600,F_CPU) ); break; |
case Baud_9600: uart1_init( 129); break; |
case Baud_19200: uart1_init( UART_BAUD_SELECT(19200,F_CPU) ); break; |
case Baud_38400: uart1_init( UART_BAUD_SELECT(38400,F_CPU) ); break; |
case Baud_57600: uart1_init( UART_BAUD_SELECT(57600,F_CPU) ); break; |
// case Baud_57600: uart1_init( 21); break; |
// case Baud_115200: uart1_init( UART_BAUD_SELECT(115200,F_CPU) ); break; |
case Baud_115200: uart1_init( 10 ); break; |
} |
} |
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// |
// these functions are only for ATmegas with two USART |
// |
|
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#if defined( ATMEGA_USART1 ) |
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//-------------------------------------------------------------- |
// Function: UART1 Receive Complete interrupt |
// Purpose: called when the UART1 has received a character |
//-------------------------------------------------------------- |
ISR(USART1_RX_vect) |
{ |
unsigned char tmphead; |
unsigned char data; |
unsigned char usr; |
unsigned char lastRxError; |
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// read UART status register and UART data register |
usr = UART1_STATUS; |
data = UART1_DATA; |
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lastRxError = (usr & (_BV(FE1)|_BV(DOR1)) ); |
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// calculate buffer index |
tmphead = ( UART1_RxHead + 1) & UART_RX_BUFFER_MASK; |
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if ( tmphead == UART1_RxTail ) |
{ |
// error: receive buffer overflow |
lastRxError = UART_BUFFER_OVERFLOW >> 8; |
UART1_RxError++; |
} |
else |
{ |
// store new index |
UART1_RxHead = tmphead; |
// store received data in buffer |
UART1_RxBuf[tmphead] = data; |
} |
UART1_LastRxError = lastRxError; |
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// if (receiveNMEA==true) |
// { |
// if (bt_receiveNMEA()) Tracking_NMEA(); |
// else receiveNMEA = false; |
// |
// } |
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} |
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//-------------------------------------------------------------- |
// Function: UART1 Data Register Empty interrupt |
// Purpose: called when the UART1 is ready to transmit the next byte |
//-------------------------------------------------------------- |
ISR(USART1_UDRE_vect) |
{ |
unsigned char tmptail; |
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if ( UART1_TxHead != UART1_TxTail) |
{ |
// calculate and store new buffer index |
tmptail = (UART1_TxTail + 1) & UART_TX_BUFFER_MASK; |
UART1_TxTail = tmptail; |
// get one byte from buffer and write it to UART |
UART1_DATA = UART1_TxBuf[tmptail]; // start transmission |
} |
else |
{ |
// tx buffer empty, disable UDRE interrupt |
UART1_CONTROL &= ~_BV(UART1_UDRIE); |
} |
} |
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//-------------------------------------------------------------- |
// Function: uart1_init() |
// Purpose: initialize UART1 and set baudrate |
// Input: baudrate using macro UART_BAUD_SELECT() |
// Returns: none |
//-------------------------------------------------------------- |
void uart1_init(unsigned int baudrate) |
{ |
UART1_TxHead = 0; |
UART1_TxTail = 0; |
UART1_RxHead = 0; |
UART1_RxTail = 0; |
UART1_RxError = 0; |
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// Set baud rate |
if ( baudrate & 0x8000 ) |
{ |
UART1_STATUS = (1<<U2X1); //Enable 2x speed |
baudrate &= ~0x8000; |
} |
UBRR1H = (unsigned char)(baudrate>>8); |
UBRR1L = (unsigned char) baudrate; |
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// Enable USART receiver and transmitter and receive complete interrupt |
UART1_CONTROL = _BV(RXCIE1)|(1<<RXEN1)|(1<<TXEN1); |
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// Set frame format: asynchronous, 8data, no parity, 1stop bit |
#ifdef URSEL1 |
UCSR1C = (1<<URSEL1)|(3<<UCSZ10); |
#else |
UCSR1C = (3<<UCSZ10); |
// UCSR1C = (1<<UCSZ11) | (1<<UCSZ10); // 8data Bit |
#endif |
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} |
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//-------------------------------------------------------------- |
// Function: uart1_getc() |
// Purpose: return byte from ringbuffer |
// Returns: lower byte: received byte from ringbuffer |
// higher byte: last receive error |
//-------------------------------------------------------------- |
unsigned int uart1_getc(void) |
{ |
unsigned char tmptail; |
unsigned char data; |
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if ( UART1_RxHead == UART1_RxTail ) |
{ |
return UART_NO_DATA; // no data available |
} |
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// calculate /store buffer index |
tmptail = (UART1_RxTail + 1) & UART_RX_BUFFER_MASK; |
UART1_RxTail = tmptail; |
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// get data from receive buffer |
data = UART1_RxBuf[tmptail]; |
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return (UART1_LastRxError << 8) + data; |
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}/* uart1_getc */ |
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//-------------------------------------------------------------- |
// Function: uart1_putc() |
// Purpose: write byte to ringbuffer for transmitting via UART |
// Input: byte to be transmitted |
// Returns: 1 on succes, 0 if remote not ready |
//-------------------------------------------------------------- |
int uart1_putc(unsigned char data) |
{ |
unsigned char tmphead; |
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tmphead = (UART1_TxHead + 1) & UART_TX_BUFFER_MASK; |
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while ( tmphead == UART1_TxTail ) |
{;} // wait for free space in buffer |
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UART1_TxBuf[tmphead] = data; |
UART1_TxHead = tmphead; |
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// enable UDRE interrupt |
UART1_CONTROL |= _BV(UART1_UDRIE); |
return (UART1_LastRxError << 8) + data; |
} |
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//-------------------------------------------------------------- |
// Function: uart1_puts() |
// Purpose: transmit string to UART1 |
// Input: string to be transmitted |
// Returns: none |
//-------------------------------------------------------------- |
void uart1_puts(const char *s ) |
{ |
while (*s) |
uart1_putc(*s++); |
} |
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//-------------------------------------------------------------- |
// Function: uart1_puts_p() |
// Purpose: transmit string from program memory to UART1 |
// Input: program memory string to be transmitted |
// Returns: none |
//-------------------------------------------------------------- |
void uart1_puts_p(const char *progmem_s ) |
{ |
register char c; |
while ( (c = pgm_read_byte(progmem_s++)) ) |
uart1_putc(c); |
} |
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//-------------------------------------------------------------- |
// Function: uart1_available() |
// Purpose: Determine the number of bytes waiting in the receive buffer |
// Input: None |
// Returns: Integer number of bytes in the receive buffer |
//-------------------------------------------------------------- |
uint16_t uart1_available(void) |
{ |
return (UART_RX_BUFFER_MASK + UART1_RxHead - UART1_RxTail) % UART_RX_BUFFER_MASK; |
} |
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//-------------------------------------------------------------- |
// Function: uart1_flush() |
// Purpose: Flush bytes waiting the receive buffer. Acutally ignores them. |
// Input: None |
// Returns: None |
//-------------------------------------------------------------- |
void uart1_flush(void) |
{ |
UART1_RxHead = UART1_RxTail; |
} |
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/************************************************************************* |
Function: utoa() |
Purpose: convert unsigned integer to ascii |
Input: string_buffer, string_buffer_size, unsigned integer value |
Returns: first ascii character |
**************************************************************************/ |
char *utoa1(char* buffer, const unsigned int size, unsigned int value) |
{ |
char *p; |
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// p points to last char |
p = buffer+size-1; |
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// Set terminating Zero |
*p='\0'; |
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do |
{ |
*--p = value%10 + '0'; |
value = value/10; |
} while (value!=0 && p>buffer); |
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return p; |
}/* utoa */ |
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#endif |
#endif |
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Property changes: |
Added: svn:executable |