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 /*   HardwareSerial.cpp - Hardware serial library for Wiring   Copyright (c) 2006 Nicholas Zambetti.  All right reserved.    This library is...”

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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
Modified 28 September 2010 by Mark Sproul
Modified 14 August 2012 by Alarus
*/

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include "Arduino.h"
#include "wiring_private.h"

// this next line disables the entire HardwareSerial.cpp,
// this is so I can support Attiny series and any other chip without a uart
#if defined(UBRRH) || defined(UBRR0H) || defined(UBRR1H) || defined(UBRR2H) || defined(UBRR3H)

#include "HardwareSerial.h"

/*
* on ATmega8, the uart and its bits are not numbered, so there is no "TXC0"
* definition.
*/
#if !defined(TXC0)
#if defined(TXC)
#define TXC0 TXC
#elif defined(TXC1)
// Some devices have uart1 but no uart0
#define TXC0 TXC1
#else
#error TXC0 not definable in HardwareSerial.h
#endif
#endif

// Define constants and variables for buffering incoming serial data. We're
// using a ring buffer (I think), in which head is the index of the location
// to which to write the next incoming character and tail is the index of the
// location from which to read.
#if (RAMEND < 1000)
#define SERIAL_BUFFER_SIZE 16
#else
#define SERIAL_BUFFER_SIZE 64
#endif

struct ring_buffer
{
unsigned char buffer[SERIAL_BUFFER_SIZE];
volatile unsigned int head;
volatile unsigned int tail;
};

#if defined(USBCON)
ring_buffer rx_buffer = { { 0 }, 0, 0};
ring_buffer tx_buffer = { { 0 }, 0, 0};
#endif
#if defined(UBRRH) || defined(UBRR0H)
ring_buffer rx_buffer = { { 0 }, 0, 0 };
ring_buffer tx_buffer = { { 0 }, 0, 0 };
#endif
#if defined(UBRR1H)
ring_buffer rx_buffer1 = { { 0 }, 0, 0 };
ring_buffer tx_buffer1 = { { 0 }, 0, 0 };
#endif
#if defined(UBRR2H)
ring_buffer rx_buffer2 = { { 0 }, 0, 0 };
ring_buffer tx_buffer2 = { { 0 }, 0, 0 };
#endif
#if defined(UBRR3H)
ring_buffer rx_buffer3 = { { 0 }, 0, 0 };
ring_buffer tx_buffer3 = { { 0 }, 0, 0 };
#endif

inline void store_char(unsigned char c, ring_buffer *buffer)
{
int i = (unsigned int)(buffer->head + 1) % SERIAL_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 != buffer->tail) {
buffer->buffer[buffer->head] = c;
buffer->head = i;
}
}

#if !defined(USART0_RX_vect) && defined(USART1_RX_vect)
// do nothing - on the 32u4 the first USART is USART1
#else
#if !defined(USART_RX_vect) && !defined(USART0_RX_vect) && \
!defined(USART_RXC_vect)
#error "Don't know what the Data Received vector is called for the first UART"
#else
void serialEvent() __attribute__((weak));
void serialEvent() {}
#define serialEvent_implemented
#if defined(USART_RX_vect)
ISR(USART_RX_vect)
#elif defined(USART0_RX_vect)
ISR(USART0_RX_vect)
#elif defined(USART_RXC_vect)
ISR(USART_RXC_vect) // ATmega8
#endif
{
#if defined(UDR0)
if (bit_is_clear(UCSR0A, UPE0)) {
unsigned char c = UDR0;
store_char(c, &rx_buffer);
} else {
unsigned char c = UDR0;
};
#elif defined(UDR)
if (bit_is_clear(UCSRA, PE)) {
unsigned char c = UDR;
store_char(c, &rx_buffer);
} else {
unsigned char c = UDR;
};
#else
#error UDR not defined
#endif
}
#endif
#endif

#if defined(USART1_RX_vect)
void serialEvent1() __attribute__((weak));
void serialEvent1() {}
#define serialEvent1_implemented
ISR(USART1_RX_vect)
{
if (bit_is_clear(UCSR1A, UPE1)) {
unsigned char c = UDR1;
store_char(c, &rx_buffer1);
} else {
unsigned char c = UDR1;
};
}
#endif

#if defined(USART2_RX_vect) && defined(UDR2)
void serialEvent2() __attribute__((weak));
void serialEvent2() {}
#define serialEvent2_implemented
ISR(USART2_RX_vect)
{
if (bit_is_clear(UCSR2A, UPE2)) {
unsigned char c = UDR2;
store_char(c, &rx_buffer2);
} else {
unsigned char c = UDR2;
};
}
#endif

#if defined(USART3_RX_vect) && defined(UDR3)
void serialEvent3() __attribute__((weak));
void serialEvent3() {}
#define serialEvent3_implemented
ISR(USART3_RX_vect)
{
if (bit_is_clear(UCSR3A, UPE3)) {
unsigned char c = UDR3;
store_char(c, &rx_buffer3);
} else {
unsigned char c = UDR3;
};
}
#endif

void serialEventRun(void)
{
#ifdef serialEvent_implemented
if (Serial.available()) serialEvent();
#endif
#ifdef serialEvent1_implemented
if (Serial1.available()) serialEvent1();
#endif
#ifdef serialEvent2_implemented
if (Serial2.available()) serialEvent2();
#endif
#ifdef serialEvent3_implemented
if (Serial3.available()) serialEvent3();
#endif
}

#if !defined(USART0_UDRE_vect) && defined(USART1_UDRE_vect)
// do nothing - on the 32u4 the first USART is USART1
#else
#if !defined(UART0_UDRE_vect) && !defined(UART_UDRE_vect) && !defined(USART0_UDRE_vect) && !defined(USART_UDRE_vect)
#error "Don't know what the Data Register Empty vector is called for the first UART"
#else
#if defined(UART0_UDRE_vect)
ISR(UART0_UDRE_vect)
#elif defined(UART_UDRE_vect)
ISR(UART_UDRE_vect)
#elif defined(USART0_UDRE_vect)
ISR(USART0_UDRE_vect)
#elif defined(USART_UDRE_vect)
ISR(USART_UDRE_vect)
#endif
{
if (tx_buffer.head == tx_buffer.tail) {
// Buffer empty, so disable interrupts
#if defined(UCSR0B)
cbi(UCSR0B, UDRIE0);
#else
cbi(UCSRB, UDRIE);
#endif
}
else {
// There is more data in the output buffer. Send the next byte
unsigned char c = tx_buffer.buffer[tx_buffer.tail];
tx_buffer.tail = (tx_buffer.tail + 1) % SERIAL_BUFFER_SIZE;

#if defined(UDR0)
UDR0 = c;
#elif defined(UDR)
UDR = c;
#else
#error UDR not defined
#endif
}
}
#endif
#endif

#ifdef USART1_UDRE_vect
ISR(USART1_UDRE_vect)
{
if (tx_buffer1.head == tx_buffer1.tail) {
// Buffer empty, so disable interrupts
cbi(UCSR1B, UDRIE1);
}
else {
// There is more data in the output buffer. Send the next byte
unsigned char c = tx_buffer1.buffer[tx_buffer1.tail];
tx_buffer1.tail = (tx_buffer1.tail + 1) % SERIAL_BUFFER_SIZE;

UDR1 = c;
}
}
#endif

#ifdef USART2_UDRE_vect
ISR(USART2_UDRE_vect)
{
if (tx_buffer2.head == tx_buffer2.tail) {
// Buffer empty, so disable interrupts
cbi(UCSR2B, UDRIE2);
}
else {
// There is more data in the output buffer. Send the next byte
unsigned char c = tx_buffer2.buffer[tx_buffer2.tail];
tx_buffer2.tail = (tx_buffer2.tail + 1) % SERIAL_BUFFER_SIZE;

UDR2 = c;
}
}
#endif

#ifdef USART3_UDRE_vect
ISR(USART3_UDRE_vect)
{
if (tx_buffer3.head == tx_buffer3.tail) {
// Buffer empty, so disable interrupts
cbi(UCSR3B, UDRIE3);
}
else {
// There is more data in the output buffer. Send the next byte
unsigned char c = tx_buffer3.buffer[tx_buffer3.tail];
tx_buffer3.tail = (tx_buffer3.tail + 1) % SERIAL_BUFFER_SIZE;

UDR3 = c;
}
}
#endif

// Constructors ////////////////////////////////////////////////////////////////

HardwareSerial::HardwareSerial(ring_buffer *rx_buffer, ring_buffer *tx_buffer,
volatile uint8_t *ubrrh, volatile uint8_t *ubrrl,
volatile uint8_t *ucsra, volatile uint8_t *ucsrb,
volatile uint8_t *ucsrc, volatile uint8_t *udr,
uint8_t rxen, uint8_t txen, uint8_t rxcie, uint8_t udrie, uint8_t u2x)
{
_rx_buffer = rx_buffer;
_tx_buffer = tx_buffer;
_ubrrh = ubrrh;
_ubrrl = ubrrl;
_ucsra = ucsra;
_ucsrb = ucsrb;
_ucsrc = ucsrc;
_udr = udr;
_rxen = rxen;
_txen = txen;
_rxcie = rxcie;
_udrie = udrie;
_u2x = u2x;
}

// Public Methods //////////////////////////////////////////////////////////////

void HardwareSerial::begin(unsigned long baud)
{
uint16_t baud_setting;
bool use_u2x = true;

#if F_CPU == 16000000UL
// hardcoded exception for compatibility with the bootloader shipped
// with the Duemilanove and previous boards and the firmware on the 8U2
// on the Uno and Mega 2560.
if (baud == 57600) {
use_u2x = false;
}
#endif

try_again:

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;
}

if ((baud_setting > 4095) && use_u2x)
{
use_u2x = false;
goto try_again;
}

// assign the baud_setting, a.k.a. ubbr (USART Baud Rate Register)
*_ubrrh = baud_setting >> 8;
*_ubrrl = baud_setting;

transmitting = false;

sbi(*_ucsrb, _rxen);
sbi(*_ucsrb, _txen);
sbi(*_ucsrb, _rxcie);
cbi(*_ucsrb, _udrie);
}

void HardwareSerial::begin(unsigned long baud, byte config)
{
uint16_t baud_setting;
uint8_t current_config;
bool use_u2x = true;

#if F_CPU == 16000000UL
// hardcoded exception for compatibility with the bootloader shipped
// with the Duemilanove and previous boards and the firmware on the 8U2
// on the Uno and Mega 2560.
if (baud == 57600) {
use_u2x = false;
}
#endif

try_again:

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;
}

if ((baud_setting > 4095) && use_u2x)
{
use_u2x = false;
goto try_again;
}

// assign the baud_setting, a.k.a. ubbr (USART Baud Rate Register)
*_ubrrh = baud_setting >> 8;
*_ubrrl = baud_setting;

//set the data bits, parity, and stop bits
#if defined(__AVR_ATmega8__)
config |= 0x80; // select UCSRC register (shared with UBRRH)
#endif
*_ucsrc = config;

sbi(*_ucsrb, _rxen);
sbi(*_ucsrb, _txen);
sbi(*_ucsrb, _rxcie);
cbi(*_ucsrb, _udrie);
}

void HardwareSerial::end()
{
// wait for transmission of outgoing data
while (_tx_buffer->head != _tx_buffer->tail)
;

cbi(*_ucsrb, _rxen);
cbi(*_ucsrb, _txen);
cbi(*_ucsrb, _rxcie);
cbi(*_ucsrb, _udrie);

// clear any received data
_rx_buffer->head = _rx_buffer->tail;
}

int HardwareSerial::available(void)
{
return (unsigned int)(SERIAL_BUFFER_SIZE + _rx_buffer->head - _rx_buffer->tail) % SERIAL_BUFFER_SIZE;
}

int HardwareSerial::peek(void)
{
if (_rx_buffer->head == _rx_buffer->tail) {
return -1;
} else {
return _rx_buffer->buffer[_rx_buffer->tail];
}
}

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 = (unsigned int)(_rx_buffer->tail + 1) % SERIAL_BUFFER_SIZE;
return c;
}
}

void HardwareSerial::flush()
{
// UDR is kept full while the buffer is not empty, so TXC triggers when EMPTY && SENT
while (transmitting && ! (*_ucsra & _BV(TXC0)));
transmitting = false;
}

size_t HardwareSerial::write(uint8_t c)
{
int i = (_tx_buffer->head + 1) % SERIAL_BUFFER_SIZE;

// If the output buffer is full, there's nothing for it other than to
// wait for the interrupt handler to empty it a bit
// ???: return 0 here instead?
while (i == _tx_buffer->tail)
;

_tx_buffer->buffer[_tx_buffer->head] = c;
_tx_buffer->head = i;

sbi(*_ucsrb, _udrie);
// clear the TXC bit -- "can be cleared by writing a one to its bit location"
transmitting = true;
sbi(*_ucsra, TXC0);

return 1;
}

HardwareSerial::operator bool() {
return true;
}

// Preinstantiate Objects //////////////////////////////////////////////////////

#if defined(UBRRH) && defined(UBRRL)
HardwareSerial Serial(&rx_buffer, &tx_buffer, &UBRRH, &UBRRL, &UCSRA, &UCSRB, &UCSRC, &UDR, RXEN, TXEN, RXCIE, UDRIE, U2X);
#elif defined(UBRR0H) && defined(UBRR0L)
HardwareSerial Serial(&rx_buffer, &tx_buffer, &UBRR0H, &UBRR0L, &UCSR0A, &UCSR0B, &UCSR0C, &UDR0, RXEN0, TXEN0, RXCIE0, UDRIE0, U2X0);
#elif defined(USBCON)
// do nothing - Serial object and buffers are initialized in CDC code
#else
#error no serial port defined (port 0)
#endif

#if defined(UBRR1H)
HardwareSerial Serial1(&rx_buffer1, &tx_buffer1, &UBRR1H, &UBRR1L, &UCSR1A, &UCSR1B, &UCSR1C, &UDR1, RXEN1, TXEN1, RXCIE1, UDRIE1, U2X1);
#endif
#if defined(UBRR2H)
HardwareSerial Serial2(&rx_buffer2, &tx_buffer2, &UBRR2H, &UBRR2L, &UCSR2A, &UCSR2B, &UCSR2C, &UDR2, RXEN2, TXEN2, RXCIE2, UDRIE2, U2X2);
#endif
#if defined(UBRR3H)
HardwareSerial Serial3(&rx_buffer3, &tx_buffer3, &UBRR3H, &UBRR3L, &UCSR3A, &UCSR3B, &UCSR3C, &UDR3, RXEN3, TXEN3, RXCIE3, UDRIE3, U2X3);
#endif

#endif // whole file

</pre>

HardwareSerial.cpp - 版本历史

YWrobot WM：创建页面，内容为“
/* HardwareSerial.cpp - Hardware serial library for Wiring Copyright (c) 2006 Nicholas Zambetti. All right reserved. This library is...”