kjkent / openocd-ft232h

OpenOCD config for the popular FT232H breakout boards.

FT232H breakout board OpenOCD config

tl;dr?

• Pinout:

  Pin	JTAG	SWD
  D0	TCK	CLK
  D1	TDI	DIO
  D2	TDO	DIO
  D3	TMS
  D4	nTRST
  D5	nSRST

• Scroll to the bottom of the config to set JTAG/SWD

What is this?

This repo holds a configuration for using the FTDI FT232H (as an adapter) with OpenOCD. There are few other examples out there, I've found these to be either vendor-specific, with errors, and/or with little explanation of the configuration. As OpenOCD's docs can be a bit heavy for the novice, this config aims to explain why its parameters are set as they are.

The FT232H is an inexpensive entrypoint into hardware debugging and hacking. The chips come with sane defaults, but can be further configured using FTDI's FT_PROG (Windows Only) software if necessary.

References

• FTDI FT232H datasheet
• OpenOCD ftdi driver source
• OpenOCD docs on adapter config
• Intel docs on JTAG pull-ups/downs