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Initial support of a "Lasertag" toy protocol
* sendLasertag() & decodeLasertag() for issue #366 * Tweak getRClevel() to allow custom tolerances and excess levels. * Unit tests for Lasertag etc. * Update example code & tools for this protocol.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,122 @@ | ||
| // Copyright 2017 David Conran | ||
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| #include <algorithm> | ||
| #include "IRrecv.h" | ||
| #include "IRsend.h" | ||
| #include "IRtimer.h" | ||
| #include "IRutils.h" | ||
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| // LL AAA SSSSS EEEEEEE RRRRRR TTTTTTT AAA GGGG | ||
| // LL AAAAA SS EE RR RR TTT AAAAA GG GG | ||
| // LL AA AA SSSSS EEEEE RRRRRR TTT AA AA GG | ||
| // LL AAAAAAA SS EE RR RR TTT AAAAAAA GG GG | ||
| // LLLLLLL AA AA SSSSS EEEEEEE RR RR TTT AA AA GGGGGG | ||
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| // Constants | ||
| #define MIN_LASERTAG_SAMPLES 13U | ||
| #define LASERTAG_TICK 333U | ||
| #define LASERTAG_MIN_GAP 100000UL // Completely made up amount. | ||
| #define LASERTAG_TOLERANCE TOLERANCE // Percentage error margin | ||
| #define LASERTAG_EXCESS 20U // See MARK_EXCESS | ||
| const int16_t kSPACE = 1; | ||
| const int16_t kMARK = 0; | ||
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| #if SEND_LASERTAG | ||
| // Send a Lasertag packet. | ||
| // This protocol is pretty much just raw Manchester encoding. | ||
| // | ||
| // Args: | ||
| // data: The message you wish to send. | ||
| // nbits: Bit size of the protocol you want to send. | ||
| // repeat: Nr. of extra times the data will be sent. | ||
| // | ||
| // Status: Alpha / Untested. | ||
| // | ||
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| void IRsend::sendLasertag(uint64_t data, uint16_t nbits, uint16_t repeat) { | ||
| if (nbits > sizeof(data) * 8) | ||
| return; // We can't send something that big. | ||
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| // Set 36kHz IR carrier frequency & a 1/4 (25%) duty cycle. | ||
| // NOTE: duty cycle is not confirmed. Just guessing based on RC5/6 protocols. | ||
| enableIROut(36, 25); | ||
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| for (uint16_t i = 0; i <= repeat; i++) { | ||
| // Data | ||
| for (uint64_t mask = 1ULL << (nbits - 1); mask; mask >>= 1) | ||
| if (data & mask) { // 1 | ||
| space(LASERTAG_TICK); // 1 is space, then mark. | ||
| mark(LASERTAG_TICK); | ||
| } else { // 0 | ||
| mark(LASERTAG_TICK); // 0 is mark, then space. | ||
| space(LASERTAG_TICK); | ||
| } | ||
| // Footer | ||
| space(LASERTAG_MIN_GAP); | ||
| } | ||
| } | ||
| #endif // SEND_LASERTAG | ||
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| #if DECODE_LASERTAG | ||
| // Decode the supplied Lasertag message. | ||
| // This protocol is pretty much just raw Manchester encoding. | ||
| // | ||
| // Args: | ||
| // results: Ptr to the data to decode and where to store the decode result. | ||
| // nbits: The number of data bits to expect. | ||
| // strict: Flag indicating if we should perform strict matching. | ||
| // Returns: | ||
| // boolean: True if it can decode it, false if it can't. | ||
| // | ||
| // Status: So Alpha, it hurts. | ||
| // | ||
| // Ref: | ||
| // http://www.sbprojects.com/knowledge/ir/rc5.php | ||
| // https://en.wikipedia.org/wiki/RC-5 | ||
| // https://en.wikipedia.org/wiki/Manchester_code | ||
| bool IRrecv::decodeLasertag(decode_results *results, uint16_t nbits, | ||
| bool strict) { | ||
| if (results->rawlen < MIN_LASERTAG_SAMPLES) return false; | ||
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| // Compliance | ||
| if (strict && nbits != LASERTAG_BITS) return false; | ||
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| uint16_t offset = OFFSET_START; | ||
| uint16_t used = 0; | ||
| uint64_t data = 0; | ||
| uint16_t actual_bits = 0; | ||
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| // No Header | ||
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| // Data | ||
| for (; offset <= results->rawlen; actual_bits++) { | ||
| int16_t levelA = getRClevel(results, &offset, &used, LASERTAG_TICK, | ||
| LASERTAG_TOLERANCE, LASERTAG_EXCESS); | ||
| int16_t levelB = getRClevel(results, &offset, &used, LASERTAG_TICK, | ||
| LASERTAG_TOLERANCE, LASERTAG_EXCESS); | ||
| if (levelA == kSPACE && levelB == kMARK) { | ||
| data = (data << 1) | 1; // 1 | ||
| } else { | ||
| if (levelA == kMARK && levelB == kSPACE) { | ||
| data <<= 1; // 0 | ||
| } else { | ||
| break; | ||
| } | ||
| } | ||
| } | ||
| // Footer (None) | ||
|
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| // Compliance | ||
| if (actual_bits < nbits) return false; // Less data than we expected. | ||
| if (strict && actual_bits != LASERTAG_BITS) return false; | ||
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| // Success | ||
| results->decode_type = LASERTAG; | ||
| results->value = data; | ||
| results->address = data & 0xF; // Unit | ||
| results->command = data >> 4; // Team | ||
| results->repeat = false; | ||
| results->bits = actual_bits; | ||
| return true; | ||
| } | ||
| #endif // DECODE_LASERTAG |
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