JTAGing the Mini? « LeafLabs Garden

JTAGing the Mini?

(3 posts) (3 voices)

ianmga
Member

Uuuhh. Is there a way to JTAG your way into the Mini? I was checking out the wonders of the Mini I just got and realized I had assumed it had a JTAG connector somewhere.

Posted 4 years ago #
gbulmer
Moderator
ianmga - the 48pin STM32F103CB has all the JTAG signals on the headers.

I looked at the datasheet at:
http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00161566.pdf

and JTAG is on:
```
Name   Port  Mini-pin
JTMS   PA14    D21
JTDI   PA15    D20
JTDO   PB3     D19
JNTRST PB4     D18

NRST   NRST    RESET
```
You'll need to make an adapter of some description.
Several people have used dorkbotpdx.org for one-off (three off) PCBs, but you could use veroboard.

(full disclosure: I am not a member of LeafLabs staff)
Posted 4 years ago #
mbolivar
LeafLabs

Note also that the Mini disables JTAG and SW-Debug by default at init() time, so those pins can be used as GPIOs:

https://github.com/leaflabs/libmaple/blob/0.0.11/wirish/boards/maple_mini.cpp#L39

Calling enableDebugPorts() within setup() may let you use JTAG again, but I haven't tried it. A safer workaround for now would be to comment out the call to disableDebugPorts() in Maple Mini's boardInit().

Posted 4 years ago #

You must log in to post.