|-------|------|
| J30 | TDO |
| ... | TDI |
| ... | TMS |
| J27 | TCK |
Image Credit: Anton Blanchard.
sudo openocd -s /usr/local/share/openocd -f buspirate-flash.cfg
Programming Colorlight 5A-75B (15$ ECP5 FPGA board) with 2$ STM32 "Blue Pill"
based JTAG adapter is fun. Thanks to DirtyJTAG and UrJTAG! The Blue Pill
might be the cheapest JTAG programmer around (< 2 USD on AliExpress)?
Flash DirtyJTAG firmware to Blue Pill (STM32F103C8T6):
st-flash write dirtyjtag.bluepill.bin 0x8000000
DirtyJTAG Pinout:
The bluepill build of DirtyJTAG has the following pinout:
| STM32 | JTAG |
|---|---|
| PA0 | TDI |
| PA1 | TDO |
| PA2 | TCK |
| PA3 | TMS |
| PA4 | TRST |
| PA5 | SRST |
Run blinky example on the FPGA:
$ sudo jtag
UrJTAG 2019.12 #ae2cacce
Copyright (C) 2002, 2003 ETC s.r.o.
Copyright (C) 2007, 2008, 2009 Kolja Waschk and the respective authors
UrJTAG is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
There is absolutely no warranty for UrJTAG.
warning: UrJTAG may damage your hardware!
Type "quit" to exit, "help" for help.
jtag> bsdl path .
jtag> cable dirtyjtag
jtag> detect
IR length: 8
Chain length: 1
Device Id: 01000001000100010001000001000011 (0x41111043)
Filename: ./BSDLLFE5U25FCABGA256.bsm
jtag> svf /tmp/blink.svf ref_freq=100000
Done ;)
This works but I have no idea what many of these things are. Time to learn... ;)