SWD connection to FST-01

FST-01 has SWD port to write flash ROM of MCU.

There had been no good SWD debugger (hardware and software) in the past. Now, ST-Link/V2 is available, and it is not expensive.

While waiting new OpenOCD release which supports ST-Link/V2, I wrote tool/stlikv2.py to write Gnuk image to FST-01.

This article explains how I connect FST-01 and ST-Link/V2.

SWD connection of ST-Link/V2

I connect FST-01 and ST-Link/V2 by two cables.

RED and BLUE cable is connected to power port, and WHITE and BLACK cable should be connected to SWD port. That's because ST-Link/V2 requires MCU Vdd to detect target board.

Here is a figure:

CN3 of ST-Link/V2
                    1 2 [MCU VDD] RED  ----->
                    3 4 [GND    ] BLUE -----> Power port of FST-01
                    5 6
/--- BLACK [SWD-IO] 7 8
|/-- WHITE [SWDCLK] 9 10
||                  ...
vv                 19 20
SWD port of FST-01


Top View of FST-01:
                            WHITE BLACK
                               ^  ^
                               |  | SWD port (GND, SWD-CLK, SWD-IO)
    Power port +---------------------+
RED  <---  Vdd |[]           []()() -------+
BLUE <---  GND |[]                  |      |
               |()() I/O port       | USB  |
               |                    |      |
               |                    -------+
               +---------------------+

Making The Cables

I use Mac-8's XC-2 and 2.54mm pitch 2-pin connector to make the cables.

Here are those parts.

I cut the wire of XC-2 to 12cm or so, and strip the ends.

Then, I put receptacles to the wires and put them to connector(enclosure). Result is here.

Using the cables

Here is a pocture to connect FST-01 and ST-Link/V2 with the cables.

Note that I need to put the head of XC-2 by different directions, as the head is a bit bigger than the pitch of holes.

Green box is a USB Hub.