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Reverse-engineered the MSP430 serial protocol on the LP5562EVM: - I<addr><reg> reads, O<addr><reg><data> writes, status 00=OK / 02=NAK - EN pin must be jumpered to VDD (MSP430 doesn't drive it after reset) - CONFIG (0x0B) is write-only, W_CURRENT (0x09) not writable via bridge - LED cycling verified: all 4 channels respond to direct PWM control Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>