Добавлена библиотека softSerial. Общий обработчик прерываний, а также некоторые обработчики прерываний конкретных модулей перенесены в память ram

- добавлена библиотека softwareSerial. Скорость работы до 57600 включительно и на отправку, и на прием.
- в bootloader добавлена проверка контрольной суммы
- добавлен файл wiringLL.h, в котором собраны некоторые макросы. Этими макросами заменены функции в местах, чувствительных к длительности выполнения кода.
- общие функции обработки прерываний перенесены в ram память для увеличения скорости выполнения. Так же в память ram перенесены функции обработки прерываний модулей WInterrupt (прерывания от gpio), модуля tone, модуля softwareSerial
- добавлен файл-заглушка util/delay.h, необходимый для некоторых библиотек

libraries/SoftwareSerial/examples/SoftwareSerialExample/SoftwareSerialExample.ino

@@ -0,0 +1,47 @@
+/*
+  Software serial multiple serial test
+
+ Receives from the hardware serial, sends to software serial.
+ Receives from software serial, sends to hardware serial.
+
+ The circuit:
+ * RX is digital pin 2 (connect to TX of other device)
+ * TX is digital pin 6 (connect to RX of other device)
+
+ Note:
+ Not all pins on the Elbear Ace-Uno support interrupts,
+ so only the following can be used for RX:
+ 2, 3, 4, 5, 8, 9
+
+ created back in the mists of time
+ modified 25 May 2012
+ by Tom Igoe
+ based on Mikal Hart's example
+
+ This example code is in the public domain.
+
+ */
+#include <SoftwareSerial.h>
+
+SoftwareSerial mySerial(2, 6); // RX, TX
+
+void setup() {
+  // Open serial communications and wait for port to open:
+  Serial.begin(115200);
+  while (!Serial) ; // wait for serial port to connect. Needed for native USB port only
+  Serial.println("Goodnight moon!");
+
+  // set the data rate for the SoftwareSerial port
+  mySerial.begin(9600);
+  mySerial.println("Hello, world?");
+}
+
+void loop() { // run over and over
+  while (mySerial.available()) 
+    Serial.write(mySerial.read());
+  
+  while (Serial.available()) 
+    mySerial.write(Serial.read());
+  
+  delay(50);
+}

libraries/SoftwareSerial/examples/TwoPortReceive/TwoPortReceive.ino

@@ -0,0 +1,99 @@
+/*
+  Software serial multiple serial test
+
+ Receives from the two software serial ports,
+ sends to the hardware serial port.
+
+ In order to listen on a software port, you call port.listen().
+ When using two software serial ports, you have to switch ports
+ by listen()ing on each one in turn. Pick a logical time to switch
+ ports, like the end of an expected transmission, or when the
+ buffer is empty. This example switches ports when there is nothing
+ more to read from a port
+
+ The circuit:
+ Two devices which communicate serially are needed.
+ * First serial device's TX attached to digital pin 2(RX), RX to pin 6(TX)
+ * Second serial device's TX attached to digital pin 8(RX), RX to pin 10(TX)
+
+ Note:
+ Not all pins on the Elbear Ace-Uno support interrupts,
+ so only the following can be used for RX:
+ 2, 3, 4, 5, 8, 9
+ */
+
+#include <SoftwareSerial.h>
+
+// software serial #1: RX = digital pin 2, TX = digital pin 6
+SoftwareSerial portOne(2, 6);
+// software serial #2: RX = digital pin 8, TX = digital pin 10
+SoftwareSerial portTwo(8, 10);
+
+// active port is changed by user button pressing
+volatile bool isPortOneActive = true;
+void btn_pressed_callback(void)
+{
+  // change active port
+  if (isPortOneActive)
+  {
+    portTwo.listen();
+    Serial.println("Port two is listening");
+    isPortOneActive = false;
+  }
+  else
+  {
+    portOne.listen();
+    Serial.println("Port one is listening");
+    isPortOneActive = true;
+  }
+}
+
+void setup() 
+{
+  // Open serial communications and wait for port to open
+  Serial.begin(115200);
+  while (!Serial) {
+    ; // wait for serial port to connect. Needed for native USB port only
+  }
+
+  // attach interrupt to user button
+  attachInterrupt(digitalPinToInterrupt(BTN_BUILTIN), btn_pressed_callback, FALLING);
+
+  // Start each software serial port
+  portOne.begin(57600);
+  portTwo.begin(57600);
+
+  // First listen to port one
+  portOne.listen();
+  isPortOneActive = true;
+  Serial.println("Port one is listening");
+}
+
+void loop() 
+{
+  // check data from port one
+  if (portOne.available())
+  {
+    Serial.println("Data from port one:");
+    // while there is data coming in, read it
+    // and send to the hardware serial port
+    while (portOne.available() > 0) 
+      Serial.write((char)portOne.read());
+    
+    // blank line to separate data from the two ports
+    Serial.println();
+  }
+
+  // check data from port two
+  if (portTwo.available())
+  {
+    Serial.println("Data from port two:");
+    // while there is data coming in, read it
+    // and send to the hardware serial port
+    while (portTwo.available() > 0) 
+      Serial.write((char)portTwo.read());
+    
+    // blank line to separate data from the two ports
+    Serial.println();
+  }
+}

libraries/SoftwareSerial/keywords.txt

@@ -0,0 +1,30 @@
+#######################################
+# Syntax Coloring Map for SoftwareSerial
+# (formerly NewSoftSerial)
+#######################################
+
+#######################################
+# Datatypes (KEYWORD1)
+#######################################
+
+SoftwareSerial	KEYWORD1
+
+#######################################
+# Methods and Functions (KEYWORD2)
+#######################################
+
+begin	KEYWORD2
+end	KEYWORD2
+read	KEYWORD2
+write	KEYWORD2
+available	KEYWORD2
+isListening	KEYWORD2
+overflow	KEYWORD2
+flush	KEYWORD2
+listen	KEYWORD2
+peek	KEYWORD2
+
+#######################################
+# Constants (LITERAL1)
+#######################################
+

libraries/SoftwareSerial/library.properties

@@ -0,0 +1,10 @@
+name=SoftwareSerial
+version=0.0.0
+author=Arduino
+maintainer=Arduino <info@arduino.cc>
+sentence=Enables serial communication on any digital pin.
+paragraph=The SoftwareSerial library has been developed to allow serial communication on any digital pin of the board, using software to replicate the functionality of the hardware UART. It is possible to have multiple software serial ports with speeds up to 115200 bps. 
+category=Communication
+url=http://www.arduino.cc/en/Reference/SoftwareSerial
+architectures=MIK32_Amur
+

libraries/SoftwareSerial/src/SoftwareSerial.cpp

@@ -0,0 +1,361 @@
+/*
+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
+
+The latest version of this library can always be found at
+http://arduiniana.org.
+*/
+
+#include <Arduino.h>
+#include <SoftwareSerial.h>
+#include "wiring_LL.h" 
+
+#define MAX_SOFT_SERIAL_SPEED 115200
+#define MIN_SOFT_SERIAL_SPEED 300
+
+// Statics
+// static variable is common to all class instances
+SoftwareSerial *SoftwareSerial::active_object = 0;
+uint8_t SoftwareSerial::_receive_buffer[_SS_MAX_RX_BUFF]; 
+volatile uint8_t SoftwareSerial::_receive_buffer_tail = 0;
+volatile uint8_t SoftwareSerial::_receive_buffer_head = 0;
+
+// Private methods
+
+// function placed in ram. Should not call other function placed in flash
+void SoftwareSerial::tunedDelay(uint32_t delayTicks)  // .ram_text
+{ 
+  if (delayTicks > 1)
+  {
+    uint64_t startTicks = SYSTICK_GET_TICKS();
+    while ((SYSTICK_GET_TICKS() - startTicks) < delayTicks)
+      ;
+  }
+}
+
+// This function sets the current object as the "listening"
+// one and returns true if it replaces another 
+bool SoftwareSerial::listen()
+{
+  if (!_rx_delay_stopbit)
+    return false;
+
+  if (active_object != this)
+  {
+    if (active_object)
+      active_object->stopListening();
+
+    _buffer_overflow = false;
+    _receive_buffer_head = _receive_buffer_tail = 0;
+    active_object = this;
+
+    setRxIntMsk(true);
+    return true;
+  }
+
+  return false;
+}
+
+// Stop listening. Returns true if we were actually listening.
+bool SoftwareSerial::stopListening()
+{
+  if (active_object == this)
+  {
+    setRxIntMsk(false);
+    active_object = NULL;
+    return true;
+  }
+  return false;
+}
+
+//
+// The receive routine called by the interrupt handler
+//
+void SoftwareSerial::recv() // .ram_text
+{  
+  // If RX line is high, then we don't see any start bit
+  // so interrupt is probably not for us
+  bool rxState = (bool)GPIO_READ_PIN((GPIO_TypeDef *)_receivePortRegister, (HAL_PinsTypeDef)_receiveBitMask);
+  if (_inverse_logic ? rxState : !rxState)
+  {
+    // Disable further interrupts during reception, this prevents triggering another interrupt
+    // directly after we return, which can cause problems at higher baudrates.
+    setRxIntMsk(false); // __always_inline__
+
+    // Wait approximately 1/2 of a bit width to "center" the sample
+    if (_rx_delay_centering > 0)
+      tunedDelay(_rx_delay_centering); // .ram_text
+
+    // Read each of the 8 bits
+    uint8_t data = 0;
+    for (uint8_t i=8; i > 0; --i)
+    {
+      tunedDelay(_rx_delay_intrabit);
+      data >>= 1;
+      if (GPIO_READ_PIN((GPIO_TypeDef *)_receivePortRegister, (HAL_PinsTypeDef)_receiveBitMask))
+        data |= 0x80;
+    }
+    if (_inverse_logic)
+      data = ~data;
+
+    // if buffer full, set the overflow flag and return
+    uint8_t next = (_receive_buffer_tail + 1) % _SS_MAX_RX_BUFF;
+    if (next != _receive_buffer_head)
+    {
+      // save new data in buffer: tail points to where byte goes
+      _receive_buffer[_receive_buffer_tail] = data; // save new byte
+      _receive_buffer_tail = next;
+    } 
+    else 
+      _buffer_overflow = true;
+
+    // skip the stop bit
+    tunedDelay(_rx_delay_stopbit);
+
+    // Re-enable interrupts when we're sure to be inside the stop bit
+    setRxIntMsk(true);
+  }
+  GPIO_IRQ_CLEAR_ALL();
+}
+
+uint8_t SoftwareSerial::rx_pin_read()
+{
+  return (uint8_t)GPIO_READ_PIN((GPIO_TypeDef *)_receivePortRegister, (HAL_PinsTypeDef)_receiveBitMask);
+}
+
+// Interrupt handling
+
+/* static */
+void SoftwareSerial::handle_interrupt() // .ram_text
+{
+  if (active_object)
+  {
+    active_object->recv(); // .ram_text
+  }
+}
+
+extern "C" void __attribute__((noinline, section(".ram_text"))) softSerial_interrupt_handler(void)
+{
+  SoftwareSerial::handle_interrupt();
+}
+
+
+//
+// Constructor
+//
+SoftwareSerial::SoftwareSerial(uint8_t receivePin, uint8_t transmitPin, bool inverse_logic /* = false */) : 
+  _rx_delay_centering(0),
+  _rx_delay_intrabit(0),
+  _rx_delay_stopbit(0),
+  _tx_delay(0),
+  _buffer_overflow(false),
+  _inverse_logic(inverse_logic)
+{
+  _transmitPin = transmitPin;
+  _receivePin = receivePin;
+}
+
+//
+// Destructor
+//
+SoftwareSerial::~SoftwareSerial()
+{
+  end();
+}
+
+void SoftwareSerial::setTX(uint8_t tx)
+{
+  // save pin and port info
+  _transmitBitMask = (uint16_t)digitalPinToBitMask(tx);
+  _transmitPortRegister = (uint32_t)digitalPinToPort(tx);
+  // set state before tx pin initialization to prevent false start bit
+  if (_inverse_logic)
+    GPIO_CLEAR_PIN((GPIO_TypeDef *)_transmitPortRegister, (HAL_PinsTypeDef)_transmitBitMask);
+  else
+    GPIO_SET_PIN((GPIO_TypeDef *)_transmitPortRegister, (HAL_PinsTypeDef)_transmitBitMask);
+  // init pin as output
+  pinMode(tx, OUTPUT);
+}
+
+void SoftwareSerial::setRX(uint8_t rx)
+{
+  // save pin, port and gpio_line info
+  _receiveBitMask = (uint16_t)digitalPinToBitMask(rx);
+  _receivePortRegister = (uint32_t)digitalPinToPort(rx);
+  _int_maskLine = digitalPinToGpioIntLine(_receivePin);
+
+  // attach interrupt to rx pin if available
+  attachInterrupt(digitalPinToInterrupt(_receivePin), softSerial_interrupt_handler, _inverse_logic ? RISING : FALLING);
+  // turn on pull up for rx if logic is not inverse
+  if (!_inverse_logic)
+  {
+    uint8_t pinNumber = PIN_MASK_TO_PIN_NUMBER(_receiveBitMask);
+    if (((GPIO_TypeDef*)_receivePortRegister) == GPIO_0)
+      PIN_SET_PAD_CONFIG(PORT_0_PUPD, pinNumber, HAL_GPIO_PULL_UP);
+    else if (((GPIO_TypeDef*)_receivePortRegister) == GPIO_1)
+      PIN_SET_PAD_CONFIG(PORT_1_PUPD, pinNumber, HAL_GPIO_PULL_UP);
+  }
+  // turn off int line for while (it turning on in attachInterrupt())
+  GPIO_IRQ_LINE_DISABLE(_int_maskLine);
+}
+
+uint32_t SoftwareSerial::subtract_cap(uint32_t num, uint16_t sub) 
+{
+  if (num > sub)
+    return num - sub;
+  else
+    return 1;
+}
+
+//
+// Public methods
+//
+void SoftwareSerial::begin(long speed)
+{ 
+  // delays are empirical values here
+  _rx_delay_centering = _rx_delay_intrabit = _rx_delay_stopbit = _tx_delay = 0;
+
+  // limit speed
+  if (speed > MAX_SOFT_SERIAL_SPEED) speed = MAX_SOFT_SERIAL_SPEED;
+  if (speed < MIN_SOFT_SERIAL_SPEED) speed = MIN_SOFT_SERIAL_SPEED;
+
+  // Precalculate the various delays in number of ticks
+  uint32_t bit_delay = F_CPU / speed;
+  
+  // init tx
+  setTX(_transmitPin);
+  _tx_delay = subtract_cap(bit_delay, 35); // 1 bit delay while transmitting data
+
+  // init rx only when we have a valid INT for this pin
+  if (digitalPinToInterrupt(_receivePin) != NOT_AN_INTERRUPT) 
+  {
+    // set pin config
+    setRX(_receivePin);
+  
+    // We want to have a total delay of 1.5 bit time from start bit. Inside the loop, we already  
+    // wait for 1 bit time, so here we wait for 0.5 bit time
+    _rx_delay_centering = subtract_cap(bit_delay / 2, 315); 
+    
+    // 1 bit time
+    _rx_delay_intrabit = subtract_cap(bit_delay, 60);
+
+    // This delay aims at 3/4 of a bit time, meaning the end of the delay will be at 1/4th of the stopbit. 
+    // This allows some extra time for ISR cleanup, which makes 115200 baud at 16Mhz work more reliably   
+    _rx_delay_stopbit = subtract_cap(bit_delay * 3 / 4, 142);
+  }
+  else
+    ErrorMsgHandler("SoftwareSerial.begin(): Rx pin does not support interrupts, use different pin");
+
+  tunedDelay(_tx_delay); // if we were low this establishes the end
+
+  listen();
+}
+
+void SoftwareSerial::setRxIntMsk(bool enable)
+{
+  if (enable)
+    GPIO_IRQ_LINE_ENABLE(_int_maskLine);
+  else
+    GPIO_IRQ_LINE_DISABLE(_int_maskLine);
+}
+
+void SoftwareSerial::end()
+{
+  stopListening();
+}
+
+// function placed in ram. Should not call other function placed in flash
+size_t SoftwareSerial::write(uint8_t byte)
+{
+  if (_tx_delay == 0) 
+    return 0;
+
+  if (_inverse_logic)
+    byte = ~byte;
+
+  GLOBAL_IRQ_DISABLE(); // turn off interrupts for a clean txmit
+
+  // Write the start bit
+  if (_inverse_logic)
+    GPIO_SET_PIN((GPIO_TypeDef *)_transmitPortRegister, (HAL_PinsTypeDef)_transmitBitMask);
+  else
+    GPIO_CLEAR_PIN((GPIO_TypeDef *)_transmitPortRegister, (HAL_PinsTypeDef)_transmitBitMask);
+  tunedDelay(_tx_delay); // wait start bit
+
+  // Write each of the 8 bits in LSB mode
+  for (uint8_t i = 8; i > 0; --i)
+  {
+    if (byte & 1) // choose bit
+      GPIO_SET_PIN((GPIO_TypeDef *)_transmitPortRegister, (HAL_PinsTypeDef)_transmitBitMask);
+    else
+      GPIO_CLEAR_PIN((GPIO_TypeDef *)_transmitPortRegister, (HAL_PinsTypeDef)_transmitBitMask);
+    tunedDelay(_tx_delay);
+    byte >>= 1;
+  }
+
+  // restore pin to natural state - stop bit
+  if (_inverse_logic)
+    GPIO_CLEAR_PIN((GPIO_TypeDef *)_transmitPortRegister, (HAL_PinsTypeDef)_transmitBitMask);
+  else
+    GPIO_SET_PIN((GPIO_TypeDef *)_transmitPortRegister, (HAL_PinsTypeDef)_transmitBitMask);
+
+  // enable interrupts
+  GLOBAL_IRQ_ENABLE();
+
+  tunedDelay(_tx_delay); // wait stop bit
+  
+  return 1;
+}
+
+// Read data from buffer
+int SoftwareSerial::read()
+{
+  if (!isListening())
+    return -1;
+
+  // Empty buffer?
+  if (_receive_buffer_head == _receive_buffer_tail)
+    return -1;
+
+  // Read from "head"
+  uint8_t data = _receive_buffer[_receive_buffer_head]; // grab next byte
+  _receive_buffer_head = (_receive_buffer_head + 1) % _SS_MAX_RX_BUFF;
+  return data;
+}
+
+int SoftwareSerial::available()
+{
+  if (!isListening())
+    return 0;
+
+  return ((unsigned int)(_receive_buffer_tail + _SS_MAX_RX_BUFF - _receive_buffer_head)) % _SS_MAX_RX_BUFF;
+}
+
+void SoftwareSerial::flush()
+{
+  // There is no tx buffering, simply return
+}
+
+int SoftwareSerial::peek()
+{
+  if (!isListening())
+    return -1;
+
+  // Empty buffer?
+  if (_receive_buffer_head == _receive_buffer_tail)
+    return -1;
+
+  // Read from "head"
+  return _receive_buffer[_receive_buffer_head];
+}

libraries/SoftwareSerial/src/SoftwareSerial.h

@@ -0,0 +1,109 @@
+/*
+SoftwareSerial.h 
+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
+
+The latest version of this library can always be found at
+http://arduiniana.org.
+*/
+
+#ifndef SoftwareSerial_h
+#define SoftwareSerial_h
+
+#include <inttypes.h>
+#include <Stream.h>
+
+/******************************************************************************
+* Definitions
+******************************************************************************/
+
+#ifndef _SS_MAX_RX_BUFF
+#define _SS_MAX_RX_BUFF 64 // RX buffer size
+#endif
+
+#ifndef GCC_VERSION
+#define GCC_VERSION (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__)
+#endif
+
+class SoftwareSerial : public Stream
+{
+private:
+  // per object data
+  uint8_t _receivePin;
+  uint16_t _receiveBitMask;
+  uint32_t _receivePortRegister;
+  uint8_t _transmitPin;
+  uint16_t _transmitBitMask;
+  uint32_t _transmitPortRegister;
+  uint8_t _int_maskLine;
+
+  // must never be 0!
+  uint32_t _rx_delay_centering;
+  uint32_t _rx_delay_intrabit;
+  uint32_t _rx_delay_stopbit;
+  uint32_t _tx_delay;
+
+  uint16_t _buffer_overflow:1;
+  uint16_t _inverse_logic:1;
+
+  // static data
+  static uint8_t _receive_buffer[_SS_MAX_RX_BUFF]; 
+  static volatile uint8_t _receive_buffer_tail;
+  static volatile uint8_t _receive_buffer_head;
+  static SoftwareSerial *active_object;
+
+  // private methods
+  void recv() __attribute__((noinline, section(".ram_text")));
+  uint8_t rx_pin_read();
+  void setTX(uint8_t transmitPin);
+  void setRX(uint8_t receivePin);
+  inline void setRxIntMsk(bool enable) __attribute__((__always_inline__));
+
+  // Return num - sub, or 1 if the result would be < 1
+  static uint32_t subtract_cap(uint32_t num, uint16_t sub);
+
+  // private static method for timing
+  static void tunedDelay(uint32_t delayTicks) __attribute__((noinline, section(".ram_text")));
+
+public:
+  // public methods
+  SoftwareSerial(uint8_t receivePin, uint8_t transmitPin, bool inverse_logic = false);
+  ~SoftwareSerial();
+  void begin(long speed);
+  bool listen();
+  void end();
+  bool isListening() { return this == active_object; }
+  bool stopListening();
+  bool overflow() 
+  { 
+    bool ret = _buffer_overflow; 
+    if (ret) 
+      _buffer_overflow = false; 
+    return ret; 
+  }
+  int peek();
+
+  virtual size_t write(uint8_t byte) __attribute__((noinline, section(".ram_text")));
+  virtual int read();
+  virtual int available();
+  virtual void flush();
+  operator bool() { return true; }
+  
+  using Print::write;
+
+  // public only for easy access by interrupt handlers
+  static void handle_interrupt() __attribute__((noinline, section(".ram_text")));
+};
+
+#endif