--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sanguino/cores/arduino/HardwareSerial.cpp Thu Jul 07 12:23:34 2016 +0200
@@ -0,0 +1,428 @@
+/*
+ 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
+*/
+
+#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"
+
+// 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(SIG_USART0_RECV) && \
+ !defined(SIG_UART0_RECV) && !defined(USART0_RX_vect) && \
+ !defined(SIG_UART_RECV)
+ #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)
+ SIGNAL(USART_RX_vect)
+#elif defined(SIG_USART0_RECV)
+ SIGNAL(SIG_USART0_RECV)
+#elif defined(SIG_UART0_RECV)
+ SIGNAL(SIG_UART0_RECV)
+#elif defined(USART0_RX_vect)
+ SIGNAL(USART0_RX_vect)
+#elif defined(SIG_UART_RECV)
+ SIGNAL(SIG_UART_RECV)
+#endif
+ {
+ #if defined(UDR0)
+ unsigned char c = UDR0;
+ #elif defined(UDR)
+ unsigned char c = UDR;
+ #else
+ #error UDR not defined
+ #endif
+ store_char(c, &rx_buffer);
+ }
+#endif
+#endif
+
+#if defined(USART1_RX_vect)
+ void serialEvent1() __attribute__((weak));
+ void serialEvent1() {}
+ #define serialEvent1_implemented
+ SIGNAL(USART1_RX_vect)
+ {
+ unsigned char c = UDR1;
+ store_char(c, &rx_buffer1);
+ }
+#elif defined(SIG_USART1_RECV)
+ #error SIG_USART1_RECV
+#endif
+
+#if defined(USART2_RX_vect) && defined(UDR2)
+ void serialEvent2() __attribute__((weak));
+ void serialEvent2() {}
+ #define serialEvent2_implemented
+ SIGNAL(USART2_RX_vect)
+ {
+ unsigned char c = UDR2;
+ store_char(c, &rx_buffer2);
+ }
+#elif defined(SIG_USART2_RECV)
+ #error SIG_USART2_RECV
+#endif
+
+#if defined(USART3_RX_vect) && defined(UDR3)
+ void serialEvent3() __attribute__((weak));
+ void serialEvent3() {}
+ #define serialEvent3_implemented
+ SIGNAL(USART3_RX_vect)
+ {
+ unsigned char c = UDR3;
+ store_char(c, &rx_buffer3);
+ }
+#elif defined(SIG_USART3_RECV)
+ #error SIG_USART3_RECV
+#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 *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;
+ _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;
+
+ 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()
+{
+ while (_tx_buffer->head != _tx_buffer->tail)
+ ;
+}
+
+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);
+
+ return 1;
+}
+
+HardwareSerial::operator bool() {
+ return true;
+}
+
+// Preinstantiate Objects //////////////////////////////////////////////////////
+
+#if defined(UBRRH) && defined(UBRRL)
+ HardwareSerial Serial(&rx_buffer, &tx_buffer, &UBRRH, &UBRRL, &UCSRA, &UCSRB, &UDR, RXEN, TXEN, RXCIE, UDRIE, U2X);
+#elif defined(UBRR0H) && defined(UBRR0L)
+ HardwareSerial Serial(&rx_buffer, &tx_buffer, &UBRR0H, &UBRR0L, &UCSR0A, &UCSR0B, &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, &UDR1, RXEN1, TXEN1, RXCIE1, UDRIE1, U2X1);
+#endif
+#if defined(UBRR2H)
+ HardwareSerial Serial2(&rx_buffer2, &tx_buffer2, &UBRR2H, &UBRR2L, &UCSR2A, &UCSR2B, &UDR2, RXEN2, TXEN2, RXCIE2, UDRIE2, U2X2);
+#endif
+#if defined(UBRR3H)
+ HardwareSerial Serial3(&rx_buffer3, &tx_buffer3, &UBRR3H, &UBRR3L, &UCSR3A, &UCSR3B, &UDR3, RXEN3, TXEN3, RXCIE3, UDRIE3, U2X3);
+#endif
+
+#endif // whole file
+