An arduino library to communicate using the Dallas one-wire protocol, where the Arduino takes the role of a slave.
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#include "Arduino.h"
#include "SerialChannel.h"
byte SerialChannel::nextId = 1;
SerialChannel* SerialChannel::first = 0;
SerialChannel::Message SerialChannel::buffer1[SerialChannel::MaxPendingMessages];
SerialChannel::Message SerialChannel::buffer2[SerialChannel::MaxPendingMessages];
volatile SerialChannel::Message* SerialChannel::backBuffer;
volatile byte SerialChannel::backBufferPos;
byte SerialChannel::frontBufferSize;
SerialChannel::Message dummyMessage;
SerialChannel::SerialChannel(const char* name_)
: next(0)
, id((byte)-1)
, name(name_)
{
if(first == 0)
first = this;
else
{
SerialChannel* c = first;
while(c->next != 0) c = c->next;
c->next = this;
}
id = nextId++;
}
void SerialChannel::beginWriteInChannel(byte id, short byteCount, unsigned long time)
{
Serial.write("START");
Serial.write(id);
writeULong(time);
writeShort(byteCount);
}
void SerialChannel::write(byte* data, short byteCount, unsigned long time)
{
beginWrite(byteCount, time);
continueWrite(data, byteCount);
}
void SerialChannel::beginWrite(short byteCount, unsigned long time)
{
if (time == (unsigned long)-1)
time = micros();
handleConnection();
beginWriteInChannel(id, byteCount, time);
}
void SerialChannel::continueWrite(byte* data, short byteCount)
{
Serial.write(data, byteCount);
}
void SerialChannel::write(const char* text, unsigned long time)
{
write((byte*)text, strlen(text), time);
}
SerialChannel::Message& SerialChannel::append(byte* data, short byteCount, unsigned long time)
{
if (time == (unsigned long)-1)
time = micros();
if (backBufferPos >= MaxPendingMessages)
{
Message& msg = ((Message*)backBuffer)[MaxPendingMessages-1];
msg.id = id;
msg.data = (byte*)"OVERFLOW";
msg.byteCount = 8;
msg.time = time;
msg.longArg0 = 0;
return dummyMessage;
}
else
{
Message& msg = ((Message*)backBuffer)[backBufferPos++];
msg.id = id;
msg.data = data;
msg.byteCount = byteCount;
msg.time = time;
msg.longArg0 = 0;
return msg;
}
}
void SerialChannel::append(const char* text, unsigned long time)
{
append((byte*)text, strlen(text), time);
}
void SerialChannel::appendInt(const char* text, short textLength, int arg0, unsigned long time)
{
Message& msg = append((byte*)text, textLength, time);
msg.longArg0 = arg0 | 0x40000000;
}
void SerialChannel::swap()
{
backBuffer = backBuffer == buffer1 ? buffer2 : buffer1;
frontBufferSize = backBufferPos;
backBufferPos = 0;
}
void SerialChannel::flush()
{
handleConnection();
Message* frontBuffer = backBuffer == buffer1 ? buffer2 : buffer1;
for (Message* msg = frontBuffer; msg < frontBuffer + frontBufferSize; ++msg)
{
char params[32];
params[0] = 0;
if ((msg->longArg0 & 0x40000000) != 0)
sprintf(params, ";arg0=%ld", msg->longArg0 & ~0x40000000);
short paramsSize = strlen(params);
beginWriteInChannel(msg->id, msg->byteCount + paramsSize, msg->time);
Serial.write(msg->data, msg->byteCount);
if (paramsSize > 0)
Serial.write(params, paramsSize);
Serial.flush();
}
}
void SerialChannel::writeShort(short num)
{
Serial.write((byte*)&num, 2);
}
void SerialChannel::writeULong(unsigned long num)
{
Serial.write((byte*)&num, 4);
}
void SerialChannel::handleConnection()
{
int b = Serial.read();
if(b == (int)'C')
{
Serial.write("CONNECTION");
SerialChannel* c = first;
while(c)
{
Serial.write("START");
Serial.write(0);
Serial.write("ChannelInit");
Serial.write(c->id);
writeShort(strlen(c->name));
Serial.write(c->name);
c = c->next;
}
Serial.flush();
}
}