Mitsubishi V0 Protocol

Rust module: src/protocols/mitsubishi_v0.rs Reference: REFERENCES/ProtoPirate/protocols/mitsubishi_v0.c

Overview

Mitsubishi V0 uses PWM encoding at 250/500 us. 96-bit frame (12 bytes). Level-aware: HIGH pulses are saved, LOW pulses complete the pair. After collection, data is unscrambled via bitwise NOT + counter-derived XOR mask.

Timing

Parameter	Value	Notes
Short	250 us	+/-100 us
Long	500 us	+/-100 us
Min bits	80
Frame	96 bits	12 bytes

PWM Bit Encoding

Pair (HIGH, LOW)	Bit
Short HIGH + Long LOW	1
Long HIGH + Short LOW	0

Bits collected MSB-first into a 12-byte buffer.

Frame Layout (96 bits)

After unscrambling:

• Bytes 0-3: Serial (32 bits, big-endian)
• Bytes 4-5: Counter (16 bits)
• Byte 6: Button (8 bits)
• Bytes 7-11: Remaining payload

Unscramble Algorithm

1. Bitwise NOT the first 8 bytes.
2. Extract counter from bytes [4..5]: hi = (counter >> 8) & 0xFF, lo = counter & 0xFF.
3. Compute masks: mask1 = (hi & 0xAA) | (lo & 0x55), mask2 = (lo & 0xAA) | (hi & 0x55), mask3 = mask1 ^ mask2.
4. XOR bytes [0..5] with mask3.

Decoder Steps

1. Reset – Wait for HIGH pulse; save duration.
2. DataSave – On HIGH: save duration. On LOW (unexpected): reset.
3. DataCheck – On LOW: decode pair. If 96 bits collected, unscramble and return. Otherwise continue.

Encoder

Not supported (decode-only).

Frequencies

868.35 MHz.