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diff --git a/core/HardwareSerial.cpp b/core/HardwareSerial.cpp
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-/*
- HardwareSerial.cpp - Hardware serial library for Wiring
- Copyright (c) 2006 Nicholas Zambetti. All right reserved.
-
- This library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- This library 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
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with this library; if not, write to the Free Software
- Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-
- Modified 23 November 2006 by David A. Mellis
-*/
-
-#include <stdio.h>
-#include <string.h>
-#include <inttypes.h>
-#include "wiring.h"
-#include "wiring_private.h"
-
-#include "HardwareSerial.h"
-
-// Define constants and variables for buffering incoming serial data. We're
-// using a ring buffer (I think), in which rx_buffer_head is the index of the
-// location to which to write the next incoming character and rx_buffer_tail
-// is the index of the location from which to read.
-#define RX_BUFFER_SIZE 128
-
-struct ring_buffer {
- unsigned char buffer[RX_BUFFER_SIZE];
- int head;
- int tail;
-};
-
-ring_buffer rx_buffer = { { 0 }, 0, 0 };
-
-#if defined(__AVR_ATmega1280__)
-ring_buffer rx_buffer1 = { { 0 }, 0, 0 };
-ring_buffer rx_buffer2 = { { 0 }, 0, 0 };
-ring_buffer rx_buffer3 = { { 0 }, 0, 0 };
-#endif
-
-inline void store_char(unsigned char c, ring_buffer *rx_buffer)
-{
- int i = (rx_buffer->head + 1) % RX_BUFFER_SIZE;
-
- // if we should be storing the received character into the location
- // just before the tail (meaning that the head would advance to the
- // current location of the tail), we're about to overflow the buffer
- // and so we don't write the character or advance the head.
- if (i != rx_buffer->tail) {
- rx_buffer->buffer[rx_buffer->head] = c;
- rx_buffer->head = i;
- }
-}
-
-#if defined(__AVR_ATmega1280__)
-
-SIGNAL(SIG_USART0_RECV)
-{
- unsigned char c = UDR0;
- store_char(c, &rx_buffer);
-}
-
-SIGNAL(SIG_USART1_RECV)
-{
- unsigned char c = UDR1;
- store_char(c, &rx_buffer1);
-}
-
-SIGNAL(SIG_USART2_RECV)
-{
- unsigned char c = UDR2;
- store_char(c, &rx_buffer2);
-}
-
-SIGNAL(SIG_USART3_RECV)
-{
- unsigned char c = UDR3;
- store_char(c, &rx_buffer3);
-}
-
-#else
-
-#if defined(__AVR_ATmega8__)
-SIGNAL(SIG_UART_RECV)
-#else
-SIGNAL(USART_RX_vect)
-#endif
-{
-#if defined(__AVR_ATmega8__)
- unsigned char c = UDR;
-#else
- unsigned char c = UDR0;
-#endif
- store_char(c, &rx_buffer);
-}
-
-#endif
-
-// Constructors ////////////////////////////////////////////////////////////////
-
-HardwareSerial::HardwareSerial(ring_buffer *rx_buffer,
- volatile uint8_t *ubrrh, volatile uint8_t *ubrrl,
- volatile uint8_t *ucsra, volatile uint8_t *ucsrb,
- volatile uint8_t *udr,
- uint8_t rxen, uint8_t txen, uint8_t rxcie, uint8_t udre, uint8_t u2x)
-{
- _rx_buffer = rx_buffer;
- _ubrrh = ubrrh;
- _ubrrl = ubrrl;
- _ucsra = ucsra;
- _ucsrb = ucsrb;
- _udr = udr;
- _rxen = rxen;
- _txen = txen;
- _rxcie = rxcie;
- _udre = udre;
- _u2x = u2x;
-}
-
-// Public Methods //////////////////////////////////////////////////////////////
-
-void HardwareSerial::begin(long baud)
-{
- uint16_t baud_setting;
- bool use_u2x;
-
- // U2X mode is needed for baud rates higher than (CPU Hz / 16)
- if (baud > F_CPU / 16) {
- use_u2x = true;
- } else {
- // figure out if U2X mode would allow for a better connection
-
- // calculate the percent difference between the baud-rate specified and
- // the real baud rate for both U2X and non-U2X mode (0-255 error percent)
- uint8_t nonu2x_baud_error = abs((int)(255-((F_CPU/(16*(((F_CPU/8/baud-1)/2)+1))*255)/baud)));
- uint8_t u2x_baud_error = abs((int)(255-((F_CPU/(8*(((F_CPU/4/baud-1)/2)+1))*255)/baud)));
-
- // prefer non-U2X mode because it handles clock skew better
- use_u2x = (nonu2x_baud_error > u2x_baud_error);
- }
-
- if (use_u2x) {
- *_ucsra = 1 << _u2x;
- baud_setting = (F_CPU / 4 / baud - 1) / 2;
- } else {
- *_ucsra = 0;
- baud_setting = (F_CPU / 8 / baud - 1) / 2;
- }
-
- // assign the baud_setting, a.k.a. ubbr (USART Baud Rate Register)
- *_ubrrh = baud_setting >> 8;
- *_ubrrl = baud_setting;
-
- sbi(*_ucsrb, _rxen);
- sbi(*_ucsrb, _txen);
- sbi(*_ucsrb, _rxcie);
-}
-
-uint8_t HardwareSerial::available(void)
-{
- return (RX_BUFFER_SIZE + _rx_buffer->head - _rx_buffer->tail) % RX_BUFFER_SIZE;
-}
-
-int HardwareSerial::read(void)
-{
- // if the head isn't ahead of the tail, we don't have any characters
- if (_rx_buffer->head == _rx_buffer->tail) {
- return -1;
- } else {
- unsigned char c = _rx_buffer->buffer[_rx_buffer->tail];
- _rx_buffer->tail = (_rx_buffer->tail + 1) % RX_BUFFER_SIZE;
- return c;
- }
-}
-
-void HardwareSerial::flush()
-{
- // don't reverse this or there may be problems if the RX interrupt
- // occurs after reading the value of rx_buffer_head but before writing
- // the value to rx_buffer_tail; the previous value of rx_buffer_head
- // may be written to rx_buffer_tail, making it appear as if the buffer
- // don't reverse this or there may be problems if the RX interrupt
- // occurs after reading the value of rx_buffer_head but before writing
- // the value to rx_buffer_tail; the previous value of rx_buffer_head
- // may be written to rx_buffer_tail, making it appear as if the buffer
- // were full, not empty.
- _rx_buffer->head = _rx_buffer->tail;
-}
-
-void HardwareSerial::write(uint8_t c)
-{
- while (!((*_ucsra) & (1 << _udre)))
- ;
-
- *_udr = c;
-}
-
-// Preinstantiate Objects //////////////////////////////////////////////////////
-
-#if defined(__AVR_ATmega8__)
-HardwareSerial Serial(&rx_buffer, &UBRRH, &UBRRL, &UCSRA, &UCSRB, &UDR, RXEN, TXEN, RXCIE, UDRE, U2X);
-#else
-HardwareSerial Serial(&rx_buffer, &UBRR0H, &UBRR0L, &UCSR0A, &UCSR0B, &UDR0, RXEN0, TXEN0, RXCIE0, UDRE0, U2X0);
-#endif
-
-#if defined(__AVR_ATmega1280__)
-HardwareSerial Serial1(&rx_buffer1, &UBRR1H, &UBRR1L, &UCSR1A, &UCSR1B, &UDR1, RXEN1, TXEN1, RXCIE1, UDRE1, U2X1);
-HardwareSerial Serial2(&rx_buffer2, &UBRR2H, &UBRR2L, &UCSR2A, &UCSR2B, &UDR2, RXEN2, TXEN2, RXCIE2, UDRE2, U2X2);
-HardwareSerial Serial3(&rx_buffer3, &UBRR3H, &UBRR3L, &UCSR3A, &UCSR3B, &UDR3, RXEN3, TXEN3, RXCIE3, UDRE3, U2X3);
-#endif