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AP-Remote-Software/NewHWSworking/HardwareSerial.h

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+/*
+  HardwareSerial.h - 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 28 September 2010 by Mark Sproul
+  Modified 14 August 2012 by Alarus
+  Modified 3 December 2013 by Matthijs Kooijman
+*/
+
+#ifndef HardwareSerial_h
+#define HardwareSerial_h
+
+#include <inttypes.h>
+
+#include "Stream.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 !(defined(SERIAL_TX_BUFFER_SIZE) && defined(SERIAL_RX_BUFFER_SIZE))
+#if (RAMEND < 1000)
+#define SERIAL_TX_BUFFER_SIZE 16
+#define SERIAL_RX_BUFFER_SIZE 16
+#else
+#define SERIAL_TX_BUFFER_SIZE 64
+#define SERIAL_RX_BUFFER_SIZE 64
+#endif
+#endif
+#if (SERIAL_TX_BUFFER_SIZE>256)
+typedef uint16_t tx_buffer_index_t;
+#else
+typedef uint8_t tx_buffer_index_t;
+#endif
+#if  (SERIAL_RX_BUFFER_SIZE>256)
+typedef uint16_t rx_buffer_index_t;
+#else
+typedef uint8_t rx_buffer_index_t;
+#endif
+
+// Define config for Serial.begin(baud, config);
+#define SERIAL_5N1 0x000 //0b000000000
+#define SERIAL_6N1 0x002 //0b000000010
+#define SERIAL_7N1 0x004 //0b000000100
+#define SERIAL_8N1 0x006 //0b000000110
+#define SERIAL_9N1 0x106 //0b100000110
+
+#define SERIAL_5N2 0x008 //0b000001000
+#define SERIAL_6N2 0x00A //0b000001010
+#define SERIAL_7N2 0x00C //0b000001100
+#define SERIAL_8N2 0x00E //0b000001110
+#define SERIAL_9N2 0x10E //0b100001110
+
+#define SERIAL_5E1 0x020 //0b000100000
+#define SERIAL_6E1 0x022 //0b000100010
+#define SERIAL_7E1 0x024 //0b000100100
+#define SERIAL_8E1 0x026 //0b000100110
+#define SERIAL_9E1 0x126 //0b100100110
+
+#define SERIAL_5E2 0x028 //0b000101000
+#define SERIAL_6E2 0x02A //0b000101010
+#define SERIAL_7E2 0x02C //0b000101100
+#define SERIAL_8E2 0x02E //0b000101110
+#define SERIAL_9E2 0x12E //0b100101110
+
+#define SERIAL_5O1 0x030 //0b000110000
+#define SERIAL_6O1 0x032 //0b000110010
+#define SERIAL_7O1 0x034 //0b000110100
+#define SERIAL_8O1 0x036 //0b000110110
+#define SERIAL_9O1 0x136 //0b100110110
+
+#define SERIAL_5O2 0x038 //0b000111000
+#define SERIAL_6O2 0x03A //0b000111010
+#define SERIAL_7O2 0x03C //0b000111100
+#define SERIAL_8O2 0x03E //0b000111110
+#define SERIAL_9O2 0x13E //0b100111110
+
+class HardwareSerial : public Stream
+{
+  protected:
+    volatile uint8_t * const _ubrrh;
+    volatile uint8_t * const _ubrrl;
+    volatile uint8_t * const _ucsra;
+    volatile uint8_t * const _ucsrb;
+    volatile uint8_t * const _ucsrc;
+    volatile uint8_t * const _udr;
+    // Has any byte been written to the UART since begin()
+    bool _written;
+
+    volatile rx_buffer_index_t _rx_buffer_head;
+    volatile rx_buffer_index_t _rx_buffer_tail;
+    volatile tx_buffer_index_t _tx_buffer_head;
+    volatile tx_buffer_index_t _tx_buffer_tail;
+
+    // Don't put any members after these buffers, since only the first
+    // 32 bytes of this struct can be accessed quickly using the ldd
+    // instruction.
+    unsigned char _rx_buffer[SERIAL_RX_BUFFER_SIZE];
+    unsigned char _tx_buffer[SERIAL_TX_BUFFER_SIZE];
+
+  public:
+    inline HardwareSerial(
+      volatile uint8_t *ubrrh, volatile uint8_t *ubrrl,
+      volatile uint8_t *ucsra, volatile uint8_t *ucsrb,
+      volatile uint8_t *ucsrc, volatile uint8_t *udr);
+    void begin(unsigned long baud) { begin(baud, SERIAL_8N1); }
+    void begin(unsigned long, uint16_t);
+    void end();
+    virtual int available(void);
+    virtual int peek(void);
+    virtual int read(void);
+    int availableForWrite(void);
+    virtual void flush(void);
+    virtual size_t write(uint16_t);
+    inline size_t write(unsigned long n) { return write((uint16_t)n); }
+    inline size_t write(long n) { return write((uint16_t)n); }
+    inline size_t write(int n) { return write((uint16_t)n); }
+    inline size_t write(int8_t n) { return write((uint16_t)n); }
+    inline size_t write(uint8_t n) { return write((uint16_t)n); }
+    using Print::write; // pull in write(str) and write(buf, size) from Print
+    operator bool() { return true; }
+
+    // Interrupt handlers - Not intended to be called externally
+    inline void _rx_complete_irq(void);
+    void _tx_udr_empty_irq(void);
+};
+
+#if defined(UBRRH) || defined(UBRR0H)
+  extern HardwareSerial Serial;
+  #define HAVE_HWSERIAL0
+#endif
+#if defined(UBRR1H)
+  extern HardwareSerial Serial1;
+  #define HAVE_HWSERIAL1
+#endif
+#if defined(UBRR2H)
+  extern HardwareSerial Serial2;
+  #define HAVE_HWSERIAL2
+#endif
+#if defined(UBRR3H)
+  extern HardwareSerial Serial3;
+  #define HAVE_HWSERIAL3
+#endif
+
+extern void serialEventRun(void) __attribute__((weak));
+
+#endif