162 lines
5.2 KiB
C++
162 lines
5.2 KiB
C++
/*
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HardwareSerial.h - Hardware serial library for Wiring
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Copyright (c) 2006 Nicholas Zambetti. All right reserved.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Modified 28 September 2010 by Mark Sproul
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Modified 14 August 2012 by Alarus
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Modified 3 December 2013 by Matthijs Kooijman
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*/
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#ifndef HardwareSerial_h
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#define HardwareSerial_h
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#include <inttypes.h>
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#include "Stream.h"
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// Define constants and variables for buffering incoming serial data. We're
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// using a ring buffer (I think), in which head is the index of the location
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// to which to write the next incoming character and tail is the index of the
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// location from which to read.
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#if !(defined(SERIAL_TX_BUFFER_SIZE) && defined(SERIAL_RX_BUFFER_SIZE))
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#if (RAMEND < 1000)
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#define SERIAL_TX_BUFFER_SIZE 16
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#define SERIAL_RX_BUFFER_SIZE 16
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#else
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#define SERIAL_TX_BUFFER_SIZE 64
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#define SERIAL_RX_BUFFER_SIZE 64
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#endif
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#endif
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#if (SERIAL_TX_BUFFER_SIZE>256)
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typedef uint16_t tx_buffer_index_t;
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#else
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typedef uint8_t tx_buffer_index_t;
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#endif
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#if (SERIAL_RX_BUFFER_SIZE>256)
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typedef uint16_t rx_buffer_index_t;
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#else
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typedef uint8_t rx_buffer_index_t;
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#endif
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// Define config for Serial.begin(baud, config);
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#define SERIAL_5N1 0x000 //0b000000000
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#define SERIAL_6N1 0x002 //0b000000010
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#define SERIAL_7N1 0x004 //0b000000100
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#define SERIAL_8N1 0x006 //0b000000110
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#define SERIAL_9N1 0x106 //0b100000110
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#define SERIAL_5N2 0x008 //0b000001000
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#define SERIAL_6N2 0x00A //0b000001010
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#define SERIAL_7N2 0x00C //0b000001100
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#define SERIAL_8N2 0x00E //0b000001110
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#define SERIAL_9N2 0x10E //0b100001110
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#define SERIAL_5E1 0x020 //0b000100000
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#define SERIAL_6E1 0x022 //0b000100010
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#define SERIAL_7E1 0x024 //0b000100100
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#define SERIAL_8E1 0x026 //0b000100110
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#define SERIAL_9E1 0x126 //0b100100110
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#define SERIAL_5E2 0x028 //0b000101000
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#define SERIAL_6E2 0x02A //0b000101010
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#define SERIAL_7E2 0x02C //0b000101100
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#define SERIAL_8E2 0x02E //0b000101110
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#define SERIAL_9E2 0x12E //0b100101110
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#define SERIAL_5O1 0x030 //0b000110000
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#define SERIAL_6O1 0x032 //0b000110010
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#define SERIAL_7O1 0x034 //0b000110100
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#define SERIAL_8O1 0x036 //0b000110110
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#define SERIAL_9O1 0x136 //0b100110110
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#define SERIAL_5O2 0x038 //0b000111000
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#define SERIAL_6O2 0x03A //0b000111010
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#define SERIAL_7O2 0x03C //0b000111100
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#define SERIAL_8O2 0x03E //0b000111110
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#define SERIAL_9O2 0x13E //0b100111110
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class HardwareSerial : public Stream
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{
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protected:
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volatile uint8_t * const _ubrrh;
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volatile uint8_t * const _ubrrl;
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volatile uint8_t * const _ucsra;
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volatile uint8_t * const _ucsrb;
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volatile uint8_t * const _ucsrc;
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volatile uint8_t * const _udr;
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// Has any byte been written to the UART since begin()
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bool _written;
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volatile rx_buffer_index_t _rx_buffer_head;
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volatile rx_buffer_index_t _rx_buffer_tail;
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volatile tx_buffer_index_t _tx_buffer_head;
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volatile tx_buffer_index_t _tx_buffer_tail;
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// Don't put any members after these buffers, since only the first
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// 32 bytes of this struct can be accessed quickly using the ldd
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// instruction.
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unsigned char _rx_buffer[SERIAL_RX_BUFFER_SIZE];
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unsigned char _tx_buffer[SERIAL_TX_BUFFER_SIZE];
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public:
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inline HardwareSerial(
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volatile uint8_t *ubrrh, volatile uint8_t *ubrrl,
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volatile uint8_t *ucsra, volatile uint8_t *ucsrb,
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volatile uint8_t *ucsrc, volatile uint8_t *udr);
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void begin(unsigned long baud) { begin(baud, SERIAL_8N1); }
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void begin(unsigned long, uint16_t);
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void end();
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virtual int available(void);
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virtual int peek(void);
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virtual int read(void);
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int availableForWrite(void);
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virtual void flush(void);
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virtual size_t write(uint16_t);
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inline size_t write(unsigned long n) { return write((uint16_t)n); }
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inline size_t write(long n) { return write((uint16_t)n); }
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inline size_t write(int n) { return write((uint16_t)n); }
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inline size_t write(int8_t n) { return write((uint16_t)n); }
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inline size_t write(uint8_t n) { return write((uint16_t)n); }
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using Print::write; // pull in write(str) and write(buf, size) from Print
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operator bool() { return true; }
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// Interrupt handlers - Not intended to be called externally
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inline void _rx_complete_irq(void);
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void _tx_udr_empty_irq(void);
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};
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#if defined(UBRRH) || defined(UBRR0H)
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extern HardwareSerial Serial;
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#define HAVE_HWSERIAL0
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#endif
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#if defined(UBRR1H)
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extern HardwareSerial Serial1;
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#define HAVE_HWSERIAL1
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#endif
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#if defined(UBRR2H)
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extern HardwareSerial Serial2;
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#define HAVE_HWSERIAL2
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#endif
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#if defined(UBRR3H)
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extern HardwareSerial Serial3;
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#define HAVE_HWSERIAL3
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#endif
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extern void serialEventRun(void) __attribute__((weak));
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#endif
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