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>
