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Created September 22, 2020 04:34
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5800p_twi.md

fx-5800p Two Wire Interface

Connector

2.5mm TRS audio jack and plugs.

Pinout: T: SCL, R: SDA, S: GND

Link layer

  • Not I2C.
  • Packet format: SDDDDDDDDP
    • S: Start bit (always high)
    • D: Data bit, LSB-first
    • P: Parity bit
  • Seem to run at ~8.1kHz

Protocol layer

  • "ASCII", hex-string-based
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