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Arduino-IRremote/src/ir_RC5_RC6.hpp

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/*
* ir_RC5_RC6.hpp
*
* Contains functions for receiving and sending RC5, RC5X Protocols
*
* This file is part of Arduino-IRremote https://github.com/Arduino-IRremote/Arduino-IRremote.
*
************************************************************************************
* MIT License
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is furnished
* to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
************************************************************************************
*/
#ifndef _IR_RC5_RC6_HPP
#define _IR_RC5_RC6_HPP
#if defined(DEBUG) && !defined(LOCAL_DEBUG)
#define LOCAL_DEBUG
#else
//#define LOCAL_DEBUG // This enables debug output only for this file
#endif
/** \addtogroup Decoder Decoders and encoders for different protocols
* @{
*/
uint8_t sLastSendToggleValue = 1; // To start first command with toggle 0
//uint8_t sLastReceiveToggleValue = 3; // 3 -> start value
//==============================================================================
// RRRR CCCC 55555
// R R C 5
// RRRR C 5555
// R R C 5
// R R CCCC 5555
//==============================================================================
/*
Protocol=RC5 Address=0x11 Command=0x36 Raw-Data=0x1476 13 bits MSB first
+ 900,- 900
+1800,-1750 +1800,- 850 + 900,- 850 + 900,-1750
+ 950,- 850 + 900,- 850 +1800,-1750 + 950,- 850
+1800
Sum: 23100
RC5X with 7.th MSB of command set
Protocol=RC5 Address=0x11 Command=0x76 Toggle=1 Raw-Data=0xC76 13 bits MSB first
+1800,-1750
+ 850,- 900 +1800,- 850 + 950,- 850 + 900,-1750
+ 900,- 850 + 950,- 850 +1800,-1750 + 900,- 850
+1800
Sum: 23050
*/
//
// see: https://www.sbprojects.net/knowledge/ir/rc5.php
// https://en.wikipedia.org/wiki/Manchester_code
// https://forum.arduino.cc/t/sending-rc-5-extended-code-using-irsender/1045841/10 - Protocol Maranz Extended
// mark->space => 0
// space->mark => 1
// MSB first 1 start bit, 1 field bit, 1 toggle bit + 5 bit address + 6 bit command, no stop bit
// Field bit is 1 for RC5 and inverted 7. command bit for RC5X. That way the first 64 commands of RC5X remain compatible with the original RC5.
// SF TAAA AACC CCCC
// duty factor is 25%,
//
#define RC5_ADDRESS_BITS 5
#define RC5_COMMAND_BITS 6
#define RC5_COMMAND_FIELD_BIT 1
#define RC5_TOGGLE_BIT 1
#define RC5_BITS (RC5_COMMAND_FIELD_BIT + RC5_TOGGLE_BIT + RC5_ADDRESS_BITS + RC5_COMMAND_BITS) // 13
#define RC5_UNIT 889 // 32 periods of 36 kHz (888.8888)
#define MIN_RC5_MARKS ((RC5_BITS + 1) / 2) // 7
#define RC5_DURATION (15L * RC5_UNIT) // 13335
#define RC5_REPEAT_PERIOD (128L * RC5_UNIT) // 113792
#define RC5_REPEAT_DISTANCE (RC5_REPEAT_PERIOD - RC5_DURATION) // 100 ms
/************************************
* Start of send and decode functions
************************************/
/**
* @param aCommand If aCommand is >=0x40 then we switch automatically to RC5X.
* @param aEnableAutomaticToggle Send toggle bit according to the state of the static sLastSendToggleValue variable.
*/
void IRsend::sendRC5(uint8_t aAddress, uint8_t aCommand, int_fast8_t aNumberOfRepeats, bool aEnableAutomaticToggle) {
// Set IR carrier frequency
enableIROut (RC5_RC6_KHZ);
uint16_t tIRData = ((aAddress & 0x1F) << RC5_COMMAND_BITS);
if (aCommand < 0x40) {
// Auto discovery of RC5X, set field bit to 1
tIRData |= 1 << (RC5_TOGGLE_BIT + RC5_ADDRESS_BITS + RC5_COMMAND_BITS);
} else {
// Mask bit 7 of command and let field bit 0
aCommand &= 0x3F;
}
tIRData |= aCommand;
if (aEnableAutomaticToggle) {
if (sLastSendToggleValue == 0) {
sLastSendToggleValue = 1;
// set toggled bit
tIRData |= 1 << (RC5_ADDRESS_BITS + RC5_COMMAND_BITS);
} else {
sLastSendToggleValue = 0;
}
}
uint_fast8_t tNumberOfCommands = aNumberOfRepeats + 1;
while (tNumberOfCommands > 0) {
// start bit is sent by sendBiphaseData
sendBiphaseData(RC5_UNIT, tIRData, RC5_BITS);
tNumberOfCommands--;
// skip last delay!
if (tNumberOfCommands > 0) {
// send repeated command in a fixed raster
delay(RC5_REPEAT_DISTANCE / MICROS_IN_ONE_MILLI);
}
}
#if !defined(DISABLE_CODE_FOR_RECEIVER)
IrReceiver.restartAfterSend();
#endif
}
/**
* Try to decode data as RC5 protocol
* _ _ _ _ _ _ _ _ _ _ _ _ _
* Clock _____| |_| |_| |_| |_| |_| |_| |_| |_| |_| |_| |_| |_| |
* ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ End of each data bit period
* _ _ - Mark
* 2 Start bits for RC5 _____| |_| ... - Data starts with a space->mark bit
* - Space
* _
* 1 Start bit for RC5X _____| ...
*
*/
bool IRrecv::decodeRC5() {
uint8_t tBitIndex;
uint32_t tDecodedRawData = 0;
// Set Biphase decoding start values
initBiphaselevel(1, RC5_UNIT); // Skip gap space
// Check we have the right amount of data (11 to 26). The +2 is for initial gap and start bit mark.
if (decodedIRData.rawDataPtr->rawlen < MIN_RC5_MARKS + 2 && decodedIRData.rawDataPtr->rawlen > ((2 * RC5_BITS) + 2)) {
// no debug output, since this check is mainly to determine the received protocol
IR_DEBUG_PRINT(F("RC5: "));
IR_DEBUG_PRINT(F("Data length="));
IR_DEBUG_PRINT(decodedIRData.rawDataPtr->rawlen);
IR_DEBUG_PRINTLN(F(" is not between 11 and 26"));
return false;
}
// Check start bit, the first space is included in the gap
if (getBiphaselevel() != MARK) {
IR_DEBUG_PRINT(F("RC5: "));
IR_DEBUG_PRINTLN(F("first getBiphaselevel() is not MARK"));
return false;
}
/*
* Get data bits - MSB first
*/
for (tBitIndex = 0; sBiphaseDecodeRawbuffOffset < decodedIRData.rawDataPtr->rawlen; tBitIndex++) {
// get next 2 levels and check for transition
uint8_t tStartLevel = getBiphaselevel();
uint8_t tEndLevel = getBiphaselevel();
if ((tStartLevel == SPACE) && (tEndLevel == MARK)) {
// we have a space to mark transition here
tDecodedRawData = (tDecodedRawData << 1) | 1;
} else if ((tStartLevel == MARK) && (tEndLevel == SPACE)) {
// we have a mark to space transition here
tDecodedRawData = (tDecodedRawData << 1) | 0;
} else {
#if defined(LOCAL_DEBUG)
Serial.print(F("RC5: "));
Serial.println(F("no transition found, decode failed"));
#endif
return false;
}
}
// Success
decodedIRData.numberOfBits = tBitIndex; // must be RC5_BITS
LongUnion tValue;
tValue.ULong = tDecodedRawData;
decodedIRData.decodedRawData = tDecodedRawData;
decodedIRData.command = tValue.UByte.LowByte & 0x3F;
decodedIRData.address = (tValue.UWord.LowWord >> RC5_COMMAND_BITS) & 0x1F;
// Get the inverted 7. command bit for RC5X, the inverted value is always 1 for RC5 and serves as a second start bit.
if ((tValue.UWord.LowWord & (1 << (RC5_TOGGLE_BIT + RC5_ADDRESS_BITS + RC5_COMMAND_BITS))) == 0) {
decodedIRData.command += 0x40;
}
decodedIRData.flags = IRDATA_FLAGS_IS_MSB_FIRST;
if (tValue.UByte.MidLowByte & 0x8) {
decodedIRData.flags = IRDATA_FLAGS_TOGGLE_BIT | IRDATA_FLAGS_IS_MSB_FIRST;
}
decodedIRData.protocol = RC5;
// check for repeat
checkForRepeatSpaceAndSetFlag(RC5_REPEAT_DISTANCE / MICROS_IN_ONE_MILLI);
return true;
}
//+=============================================================================
// RRRR CCCC 6666
// R R C 6
// RRRR C 6666
// R R C 6 6
// R R CCCC 666
//+=============================================================================
//
/*
Protocol=RC6 Address=0xF1 Command=0x76 Raw-Data=0xF176 20 bits MSB first
+2650,- 850
+ 500,- 850 + 500,- 400 + 450,- 450 + 450,- 850
+1400,- 400 + 450,- 450 + 450,- 450 + 450,- 900
+ 450,- 450 + 450,- 400 + 950,- 850 + 900,- 450
+ 450,- 450 + 450,- 850 + 950,- 400 + 450,- 900
+ 450
Sum: 23150
*/
// Frame RC6: 1 start bit + 1 Bit "1" + 3 mode bits (000) + 1 toggle bit + 8 address + 8 command bits + 2666us pause
// Frame RC6A: 1 start bit + 1 Bit "1" + 3 mode bits (110) + 1 toggle bit + "1" + 14 customer bits + 8 system bits + 8 command bits (=31bits) + 2666us pause
// !!! toggle bit has another timing :-( !!!
// mark->space => 1
// space->mark => 0
// https://www.sbprojects.net/knowledge/ir/rc6.php
// https://www.mikrocontroller.net/articles/IRMP_-_english#RC6_.2B_RC6A
// https://en.wikipedia.org/wiki/Manchester_code
#define MIN_RC6_SAMPLES 1
#define RC6_RPT_LENGTH 46000
#define RC6_LEADING_BIT 1
#define RC6_MODE_BITS 3 // never seen others than all 0 for Philips TV
#define RC6_TOGGLE_BIT 1 // toggles at every key press. Can be used to distinguish repeats from 2 key presses and has another timing :-(.
#define RC6_TOGGLE_BIT_INDEX RC6_MODE_BITS // fourth position, index = 3
#define RC6_ADDRESS_BITS 8
#define RC6_COMMAND_BITS 8
#define RC6_BITS (RC6_LEADING_BIT + RC6_MODE_BITS + RC6_TOGGLE_BIT + RC6_ADDRESS_BITS + RC6_COMMAND_BITS) // 13
#define RC6_UNIT 444 // 16 periods of 36 kHz (444.4444)
#define RC6_HEADER_MARK (6 * RC6_UNIT) // 2666
#define RC6_HEADER_SPACE (2 * RC6_UNIT) // 889
#define RC6_TRAILING_SPACE (6 * RC6_UNIT) // 2666
#define MIN_RC6_MARKS 4 + ((RC6_ADDRESS_BITS + RC6_COMMAND_BITS) / 2) // 12, 4 are for preamble
#define RC6_REPEAT_DISTANCE 107000 // just a guess but > 2.666ms
/**
* Main RC6 send function
*/
void IRsend::sendRC6(uint32_t aRawData, uint8_t aNumberOfBitsToSend) {
sendRC6Raw(aRawData, aNumberOfBitsToSend);
}
void IRsend::sendRC6Raw(uint32_t aRawData, uint8_t aNumberOfBitsToSend) {
// Set IR carrier frequency
enableIROut (RC5_RC6_KHZ);
// Header
mark(RC6_HEADER_MARK);
space(RC6_HEADER_SPACE);
// Start bit
mark(RC6_UNIT);
space(RC6_UNIT);
// Data MSB first
uint32_t mask = 1UL << (aNumberOfBitsToSend - 1);
for (uint_fast8_t i = 1; mask; i++, mask >>= 1) {
// The fourth bit we send is the "double width toggle bit"
unsigned int t = (i == (RC6_TOGGLE_BIT_INDEX + 1)) ? (RC6_UNIT * 2) : (RC6_UNIT);
if (aRawData & mask) {
mark(t);
space(t);
} else {
space(t);
mark(t);
}
}
#if !defined(DISABLE_CODE_FOR_RECEIVER)
IrReceiver.restartAfterSend();
#endif
}
/**
* Send RC6 64 bit raw data
* Can be used to send RC6A with ?31? data bits
*/
void IRsend::sendRC6(uint64_t aRawData, uint8_t aNumberOfBitsToSend) {
sendRC6Raw(aRawData, aNumberOfBitsToSend);
}
void IRsend::sendRC6Raw(uint64_t aRawData, uint8_t aNumberOfBitsToSend) {
// Set IR carrier frequency
enableIROut (RC5_RC6_KHZ);
// Header
mark(RC6_HEADER_MARK);
space(RC6_HEADER_SPACE);
// Start bit
mark(RC6_UNIT);
space(RC6_UNIT);
// Data MSB first
uint64_t mask = 1ULL << (aNumberOfBitsToSend - 1);
for (uint_fast8_t i = 1; mask; i++, mask >>= 1) {
// The fourth bit we send is the "double width toggle bit"
unsigned int t = (i == (RC6_TOGGLE_BIT_INDEX + 1)) ? (RC6_UNIT * 2) : (RC6_UNIT);
if (aRawData & mask) {
mark(t);
space(t);
} else {
space(t);
mark(t);
}
}
#if !defined(DISABLE_CODE_FOR_RECEIVER)
IrReceiver.restartAfterSend();
#endif
}
/**
* Assemble raw data for RC6 from parameters and toggle state and send
* We do not wait for the minimal trailing space of 2666 us
* @param aEnableAutomaticToggle Send toggle bit according to the state of the static sLastSendToggleValue variable.
*/
void IRsend::sendRC6(uint8_t aAddress, uint8_t aCommand, int_fast8_t aNumberOfRepeats, bool aEnableAutomaticToggle) {
LongUnion tIRRawData;
tIRRawData.UByte.LowByte = aCommand;
tIRRawData.UByte.MidLowByte = aAddress;
tIRRawData.UWord.HighWord = 0; // must clear high word
if (aEnableAutomaticToggle) {
if (sLastSendToggleValue == 0) {
sLastSendToggleValue = 1;
// set toggled bit
IR_DEBUG_PRINT(F("Set Toggle "));
tIRRawData.UByte.MidHighByte = 1; // 3 Mode bits are 0
} else {
sLastSendToggleValue = 0;
}
}
#if defined(LOCAL_DEBUG)
Serial.print(F("RC6: "));
Serial.print(F("sLastSendToggleValue="));
Serial.print (sLastSendToggleValue);
Serial.print(F(" RawData="));
Serial.println(tIRRawData.ULong, HEX);
#endif
uint_fast8_t tNumberOfCommands = aNumberOfRepeats + 1;
while (tNumberOfCommands > 0) {
// start and leading bits are sent by sendRC6
sendRC6Raw(tIRRawData.ULong, RC6_BITS - 1); // -1 since the leading bit is additionally sent by sendRC6
tNumberOfCommands--;
// skip last delay!
if (tNumberOfCommands > 0) {
// send repeated command in a fixed raster
delay(RC6_REPEAT_DISTANCE / MICROS_IN_ONE_MILLI);
}
}
}
/**
* Try to decode data as RC6 protocol
*/
bool IRrecv::decodeRC6() {
uint8_t tBitIndex;
uint32_t tDecodedRawData = 0;
// Check we have the right amount of data (). The +3 for initial gap, start bit mark and space
if (decodedIRData.rawDataPtr->rawlen < MIN_RC6_MARKS + 3 && decodedIRData.rawDataPtr->rawlen > ((2 * RC6_BITS) + 3)) {
IR_DEBUG_PRINT(F("RC6: "));
IR_DEBUG_PRINT(F("Data length="));
IR_DEBUG_PRINT(decodedIRData.rawDataPtr->rawlen);
IR_DEBUG_PRINTLN(F(" is not between 15 and 45"));
return false;
}
// Check header "mark" and "space", this must be done for repeat and data
if (!matchMark(decodedIRData.rawDataPtr->rawbuf[1], RC6_HEADER_MARK)
|| !matchSpace(decodedIRData.rawDataPtr->rawbuf[2], RC6_HEADER_SPACE)) {
// no debug output, since this check is mainly to determine the received protocol
IR_DEBUG_PRINT(F("RC6: "));
IR_DEBUG_PRINTLN(F("Header mark or space length is wrong"));
return false;
}
// Set Biphase decoding start values
initBiphaselevel(3, RC6_UNIT); // Skip gap-space and start-bit mark + space
// Process first bit, which is known to be a 1 (mark->space)
if (getBiphaselevel() != MARK) {
IR_DEBUG_PRINT(F("RC6: "));
IR_DEBUG_PRINTLN(F("first getBiphaselevel() is not MARK"));
return false;
}
if (getBiphaselevel() != SPACE) {
IR_DEBUG_PRINT(F("RC6: "));
IR_DEBUG_PRINTLN(F("second getBiphaselevel() is not SPACE"));
return false;
}
for (tBitIndex = 0; sBiphaseDecodeRawbuffOffset < decodedIRData.rawDataPtr->rawlen; tBitIndex++) {
uint8_t tStartLevel; // start level of coded bit
uint8_t tEndLevel; // end level of coded bit
tStartLevel = getBiphaselevel();
if (tBitIndex == RC6_TOGGLE_BIT_INDEX) {
// Toggle bit is double wide; make sure second half is equal first half
if (tStartLevel != getBiphaselevel()) {
#if defined(LOCAL_DEBUG)
Serial.print(F("RC6: "));
Serial.println(F("Toggle mark or space length is wrong"));
#endif
return false;
}
}
tEndLevel = getBiphaselevel();
if (tBitIndex == RC6_TOGGLE_BIT_INDEX) {
// Toggle bit is double wide; make sure second half matches
if (tEndLevel != getBiphaselevel()) {
#if defined(LOCAL_DEBUG)
Serial.print(F("RC6: "));
Serial.println(F("Toggle mark or space length is wrong"));
#endif
return false;
}
}
/*
* Determine tDecodedRawData bit value by checking the transition type
*/
if ((tStartLevel == MARK) && (tEndLevel == SPACE)) {
// we have a mark to space transition here
tDecodedRawData = (tDecodedRawData << 1) | 1; // inverted compared to RC5
} else if ((tStartLevel == SPACE) && (tEndLevel == MARK)) {
// we have a space to mark transition here
tDecodedRawData = (tDecodedRawData << 1) | 0;
} else {
#if defined(LOCAL_DEBUG)
Serial.print(F("RC6: "));
Serial.println(F("Decode failed"));
#endif
// we have no transition here or one level is -1 -> error
return false; // Error
}
}
// Success
decodedIRData.numberOfBits = tBitIndex;
LongUnion tValue;
tValue.ULong = tDecodedRawData;
decodedIRData.decodedRawData = tDecodedRawData;
if (tBitIndex < 36) {
// RC6 8 address bits, 8 command bits
decodedIRData.flags = IRDATA_FLAGS_IS_MSB_FIRST;
decodedIRData.command = tValue.UByte.LowByte;
decodedIRData.address = tValue.UByte.MidLowByte;
// Check for toggle flag
if ((tValue.UByte.MidHighByte & 1) != 0) {
decodedIRData.flags = IRDATA_FLAGS_TOGGLE_BIT | IRDATA_FLAGS_IS_MSB_FIRST;
}
if (tBitIndex > 20) {
decodedIRData.flags |= IRDATA_FLAGS_EXTRA_INFO;
}
} else {
// RC6A - 32 bits
decodedIRData.flags = IRDATA_FLAGS_IS_MSB_FIRST;
if ((tValue.UByte.MidLowByte & 0x80) != 0) {
decodedIRData.flags = IRDATA_FLAGS_TOGGLE_BIT | IRDATA_FLAGS_IS_MSB_FIRST;
}
tValue.UByte.MidLowByte &= 0x87F; // mask toggle bit
decodedIRData.command = tValue.UByte.LowByte;
decodedIRData.address = tValue.UByte.MidLowByte;
}
// check for repeat, do not check toggle bit yet
if (decodedIRData.rawDataPtr->rawbuf[0] < ((RC6_REPEAT_DISTANCE + (RC6_REPEAT_DISTANCE / 4)) / MICROS_PER_TICK)) {
decodedIRData.flags |= IRDATA_FLAGS_IS_REPEAT;
}
decodedIRData.protocol = RC6;
return true;
}
/*********************************************************************************
* Old deprecated functions, kept for backward compatibility to old 2.0 tutorials
*********************************************************************************/
/**
* Old version with 32 bit data
*/
void IRsend::sendRC5(uint32_t data, uint8_t nbits) {
// Set IR carrier frequency
enableIROut (RC5_RC6_KHZ);
// Start
mark(RC5_UNIT);
space(RC5_UNIT);
mark(RC5_UNIT);
// Data - Biphase code MSB first
for (uint32_t mask = 1UL << (nbits - 1); mask; mask >>= 1) {
if (data & mask) {
space(RC5_UNIT); // 1 is space, then mark
mark(RC5_UNIT);
} else {
mark(RC5_UNIT);
space(RC5_UNIT);
}
}
#if !defined(DISABLE_CODE_FOR_RECEIVER)
IrReceiver.restartAfterSend();
#endif
}
/*
* Not longer required, use sendRC5(uint8_t aAddress, uint8_t aCommand, int_fast8_t aNumberOfRepeats, bool aEnableAutomaticToggle) instead
*/
void IRsend::sendRC5ext(uint8_t addr, uint8_t cmd, bool toggle) {
// Set IR carrier frequency
enableIROut (RC5_RC6_KHZ);
uint8_t addressBits = 5;
uint8_t commandBits = 7;
// unsigned long nbits = addressBits + commandBits;
// Start
mark(RC5_UNIT);
// Bit #6 of the command part, but inverted!
uint8_t cmdBit6 = (1UL << (commandBits - 1)) & cmd;
if (cmdBit6) {
// Inverted (1 -> 0 = mark-to-space)
mark(RC5_UNIT);
space(RC5_UNIT);
} else {
space(RC5_UNIT);
mark(RC5_UNIT);
}
commandBits--;
// Toggle bit
static int toggleBit = 1;
if (toggle) {
if (toggleBit == 0) {
toggleBit = 1;
} else {
toggleBit = 0;
}
}
if (toggleBit) {
space(RC5_UNIT);
mark(RC5_UNIT);
} else {
mark(RC5_UNIT);
space(RC5_UNIT);
}
// Address
for (uint_fast8_t mask = 1UL << (addressBits - 1); mask; mask >>= 1) {
if (addr & mask) {
space(RC5_UNIT); // 1 is space, then mark
mark(RC5_UNIT);
} else {
mark(RC5_UNIT);
space(RC5_UNIT);
}
}
// Command
for (uint_fast8_t mask = 1UL << (commandBits - 1); mask; mask >>= 1) {
if (cmd & mask) {
space(RC5_UNIT); // 1 is space, then mark
mark(RC5_UNIT);
} else {
mark(RC5_UNIT);
space(RC5_UNIT);
}
}
#if !defined(DISABLE_CODE_FOR_RECEIVER)
IrReceiver.restartAfterSend();
#endif
}
/** @}*/
#if defined(LOCAL_DEBUG)
#undef LOCAL_DEBUG
#endif
#endif // _IR_RC5_RC6_HPP
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