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VisonicDecoder.cpp
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VisonicDecoder.cpp
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#include "VisonicDecoder.h"
// 868 MHz decoders
VisonicDecoder::VisonicDecoder () {}
char VisonicDecoder::decode (word width) {
if (200 <= width && width < 1000) {
byte w = width >= 600;
switch (state) {
case UNKNOWN:
case OK:
state = w == 0 ? T0 : T1;
break;
case T0:
gotBit(!w);
if (w)
return 0;
break;
case T1:
gotBit(!w);
if (!w)
return 0;
break;
}
// sync error, flip all the preceding bits to resync
for (byte i = 0; i <= pos; ++i)
data[i] ^= 0xFF;
} else if (width >= 2500 && 8 * pos + bits >= 36 && state == OK) {
for (byte i = 0; i < 4; ++i)
gotBit(0);
alignTail(5); // keep last 40 bits
// only report valid packets
byte b = data[0] ^ data[1] ^ data[2] ^ data[3] ^ data[4];
if ((b & 0xF) == (b >> 4))
return 1;
} else
return -1;
return 0;
}