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85 lines
3.5 KiB
85 lines
3.5 KiB
5 years ago
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/* IRLib_P00_HashRaw.h
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* Part of IRLib Library for Arduino receiving, decoding, and sending
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* infrared signals. See COPYRIGHT.txt and LICENSE.txt for more information.
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*/
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/*
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* If you have a protocol which is unsupported by this library, you can still receive
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* and transmit the data. You can store the raw data values in a buffer and retransmit the
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* data exactly as you received it. Of course it takes a lot of memory to store such data
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* so it is inefficient but it is better than nothing.
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* If all you need to do is detect a unique value for an unsupported protocol and you do
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* not need to resend the data, you can use the hash code decoder. It looks at the
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* array of raw timing values and create a 32 bit value based on the data. It is
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* highly likely to be unique however you cannot reverse engineer the process.
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* You cannot re-create the original data stream for 32 bit hash code.
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* This module also implements the raw send method. You have to have the original
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* timing values.
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*/
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#ifndef IRLIB_HASHRAW_H
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#define IRLIB_HASHRAW_H
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#define IR_SEND_RAW case 0: IRsendRaw::send((uint16_t*)data,data2,khz); break;
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#define IR_DECODE_HASH if(IRdecodeHash::decode()) return true;
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#ifdef IRLIB_HAVE_COMBO
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#define PV_IR_DECODE_HASH ,public virtual IRdecodeHash
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#define PV_IR_SEND_RAW ,public virtual IRsendRaw
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#else
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#define PV_IR_DECODE_HASH public virtual IRdecodeHash
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#define PV_IR_SEND_RAW public virtual IRsendRaw
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#endif
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#ifdef IRLIBSENDBASE_H
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/* The first parameter to the "IRendRaw" method is a pointer to the first element of an
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* array of uint16_t values. These values are the raw timing values in microseconds. Note
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* it is possible to simply pass "(uint16_t*) &My_Decoder.decodeBuffer[1]" if you have just
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* received a code and wish to echo it. You have to point to the index "1" because index "0"
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* of that buffer contains the gap between successive frames data and it should be ignored.
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* If the frequency to be used in transmission is not specified, it defaults to 38kHz.
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*/
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class IRsendRaw: public virtual IRsendBase {
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public:
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void send(uint16_t *buf, uint8_t len, uint8_t khz) {
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enableIROut(khz);
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for (uint8_t i = 0; i < len; i++) {
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if (i & 1) {
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space(buf[i]);
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}
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else {
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mark(buf[i]);
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}
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}
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space(0); // Just to be sure
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}
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};
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#endif //IRLIBSENDBASE_H
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#ifdef IRLIBDECODEBASE_H
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/* This Hash decoder is based on IRhashcode Copyright 2010 Ken Shirriff
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* For details see http://www.righto.com/2010/01/using-arbitrary-remotes-with-arduino.html
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* Use FNV hash algorithm: http://isthe.com/chongo/tech/comp/fnv/#FNV-param
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* Converts the raw code values into a 32-bit hash code.
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* Hopefully this code is unique for each button.
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*/
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#define FNV_PRIME_32 16777619
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#define FNV_BASIS_32 2166136261
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// Compare two tick values, return 0 if v1 is lower, 1 if equal, and 2 if v2 is higher
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#define TICKS_COMPARE(v1,v2) ( (v2< v1*0.8)?0:( (v1< v2*0.8)?2:1) )
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class IRdecodeHash: public virtual IRdecodeBase {
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public:
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bool decode(void) {
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value = FNV_BASIS_32;
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for (int i = 1; i+2 < recvGlobal.decodeLength; i++) {
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value = (value * FNV_PRIME_32) ^ TICKS_COMPARE(recvGlobal.decodeBuffer[i], recvGlobal.decodeBuffer[i+2]);
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}
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protocolNum = UNKNOWN;
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bits= (recvGlobal.decodeLength-3)/2;//Estimated number of bits of unknown protocol
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//Note that value is always 32 bit hash code.
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return true;
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}
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};
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#endif //IRLIBDECODEBASE_H
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#define IRLIB_HAVE_COMBO
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#endif //IRLIB_HASHRAW_H
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