hunter.cpp

#include "hunter.h"

/////////////////////////////////////////////////////////////////////////////
// Function: HunterBitfield
// Description: Set a value with an arbitrary bit width to a bit position
// within a blob
// Arguments: bits - blob to write the value to
// pos - bit position within the blob
// val - value to write
// len - len in bits of the value
/////////////////////////////////////////////////////////////////////////////
void HunterBitfield(vector <byte>& bits, byte pos, byte val, byte len)
{
while (len > 0)
{
if (val & 0x1)
{
bits[pos / 8] = bits[pos / 8] | 0x80 >> (pos % 8);
}
else
{
bits[pos / 8] = bits[pos / 8] & ~(0x80 >> (pos % 8));
}
len--;
val = val >> 1;
pos++;
}
}

/////////////////////////////////////////////////////////////////////////////
// Function: HunterLow
// Description: writes a low bit on the bus
// Arguments: none
/////////////////////////////////////////////////////////////////////////////
void HunterLow(void)
{
digitalWrite(HUNTER_PIN, HUNTER_ONE);
delayMicroseconds(SHORT_INTERVAL); //microseconds
digitalWrite(HUNTER_PIN, HUNTER_ZERO);
delayMicroseconds(LONG_INTERVAL); //microseconds
}

/////////////////////////////////////////////////////////////////////////////
// Function: HunterHigh
// Description: writes a high bit on the bus
// Arguments: none
/////////////////////////////////////////////////////////////////////////////
void HunterHigh(void)
{
digitalWrite(HUNTER_PIN, HUNTER_ONE);
delayMicroseconds(LONG_INTERVAL); //microseconds
digitalWrite(HUNTER_PIN, HUNTER_ZERO);
delayMicroseconds(SHORT_INTERVAL); //microseconds
}

/////////////////////////////////////////////////////////////////////////////
// Function: HunterWrite
// Description: Write the bit sequence out of the bus
// Arguments: buffer - blob containing the bits to transmit
// extrabit - if true, then write an extra 1 bit
/////////////////////////////////////////////////////////////////////////////
void HunterWrite(vector<byte> buffer, bool extrabit)
{
// Bus start sequence
//_flexwire.invert(false);
//delay(325);
//_flexwire.invert(true);
//delay(65);

// Resetimpulse
digitalWrite(HUNTER_PIN, HUNTER_ONE);
delay(325); //milliseconds
digitalWrite(HUNTER_PIN, HUNTER_ZERO);
delay(65); //milliseconds

// Write the start pulse
//_flexwire.invert(false);
//udelay(900);
//_flexwire.invert(true);

// Startimpulse
digitalWrite(HUNTER_PIN, HUNTER_ONE);
delayMicroseconds(START_INTERVAL); //microseconds
digitalWrite(HUNTER_PIN, HUNTER_ZERO);
delayMicroseconds(SHORT_INTERVAL); //microseconds

// Write the bits out
//_flexwire.write(buffer);
for (auto &sendByte : buffer)
{
for (byte inner = 0; inner < 8; inner++)
{
// Send high order bits first
if (sendByte & 0x80)
{
HunterHigh();
}
else
{
HunterLow();
}
sendByte <<= 1;
}
}

// Include an extra 1 bit
if (extrabit)
{
//_flexwire.writebit(true);
HunterHigh();
}

// Write the stop pulse
//_flexwire.writebit(false);
HunterLow();
}

/////////////////////////////////////////////////////////////////////////////
// Function: start
// Description: Start a zone
// Arguments: zone - zone number (1-48)
// time - time in minutes (0-240)
/////////////////////////////////////////////////////////////////////////////
void HunterStart(byte zone, byte time)
{

Serial.print("Hunter Start zone ");
Serial.print(zone);
Serial.print(" for ");
Serial.print(time);
Serial.println(" min");

// Start out with a base frame
vector<byte> buffer = {0xff,0x00,0x00,0x00,0x10,0x00,0x00,0x04,0x00,0x00,0x01,0x00,0x01,0xb8,0x3f};

if (zone < 1 || zone > 48)
{
Serial.println("invalid zone");
return;
}

if (time < 0 || time > 240)
{
Serial.println("invalid time");
return;
}

// The bus protocol is a little bizzare, not sure why

// Bits 9:10 are 0x1 for zones > 12 and 0x2 otherwise
if (zone > 12)
{
HunterBitfield(buffer, 9, 0x1, 2);
}
else
{
HunterBitfield(buffer, 9, 0x2, 2);
}

// Zone + 0x17 is at bits 23:29 and 36:42
HunterBitfield(buffer, 23, zone + 0x17, 7);
HunterBitfield(buffer, 36, zone + 0x17, 7);

// Zone + 0x23 is at bits 49:55 and 62:68
HunterBitfield(buffer, 49, zone + 0x23, 7);
HunterBitfield(buffer, 62, zone + 0x23, 7);

// Zone + 0x2f is at bits 75:81 and 88:94
HunterBitfield(buffer, 75, zone + 0x2f, 7);
HunterBitfield(buffer, 88, zone + 0x2f, 7);

// Time is encoded in three places and broken up by nibble
// Low nibble: bits 31:34, 57:60, and 83:86
// High nibble: bits 44:47, 70:73, and 96:99
HunterBitfield(buffer, 31, time, 4);
HunterBitfield(buffer, 44, time >> 4, 4);
HunterBitfield(buffer, 57, time, 4);
HunterBitfield(buffer, 70, time >> 4, 4);
HunterBitfield(buffer, 83, time, 4);
HunterBitfield(buffer, 96, time >> 4, 4);

// Bottom nibble of zone - 1 is at bits 109:112
HunterBitfield(buffer, 109, zone - 1, 4);

// Write the bits out of the bus
HunterWrite(buffer, true);
delay(15);
}

/////////////////////////////////////////////////////////////////////////////
// Function: stop
// Description: Stop all zones
// Arguments: None
/////////////////////////////////////////////////////////////////////////////
void HunterStop(byte zone)
{
Serial.println("HunterStop zone ");
Serial.print(zone);
Serial.print(": ");
HunterStart(zone, 0);
delay(15);
}

/////////////////////////////////////////////////////////////////////////////
// Function: program
// Description: Run a program
// Arguments: num - program number (1-4)
/////////////////////////////////////////////////////////////////////////////
void HunterProgram(byte num)
{
// Start with a basic program frame
Serial.print("HunterProgram start: ");
Serial.print(num);
vector<byte> buffer = {0xff, 0x40, 0x03, 0x96, 0x09 ,0xbd ,0x7f};

if (num < 1 || num > 4)
{
Serial.println("invalid program");
return;
}

// Program number - 1 is at bits 31:32
HunterBitfield(buffer, 31, num - 1, 2);
HunterWrite(buffer, false);
}