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README.md

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See also an rp2040 fork of this project: https://github.com/JohnDMcMaster/rprl78-src

WARNING: only works on Windows (difference in kernel driver + pyftdi bug)

Hardware setup

You need something like this:

  • Two serial cables
    • serial-gpio: FTDI C232HM-DDHSL-0
      • TOOL0: green wire
      • RESET: gray wire
      • Ground: black wire
    • serial-uart: a second USB TTL serial cable, ideally non-FTDI (so its easier to identify)
  • RESET wiring
    • Add PU resistor
    • Add serial-gpio RESET line
    • Connect to MCU RESET line
  • TOOL0 wiring
    • Add PU resistor
    • Add serial-gpio RESET line via diode (so that can pull down)
    • Add serial-uart TX line via diode (so that can pull down)
    • Add serial-uart RX line directly
  • Noting
    • As long as serial-gpio TOOL0 is high or Z it won't contend with TOOL0
    • As long as serial-uart is idle (since NRZ) it won't contend with TOOL0

You will then need to connect this to your target board, such as by attaching to a 14 pin Renesas emulator connector

API / usage

This is really an expert use thing as written. If you want more out of the box functionality, take a look at rprl78