STM CircleOS forum / Use TRACE connector as GPIO

floppes · 2013-02-24 10:07:36

I'd like to use the TRACE connector on my STM32F103VE EvoPrimer as GPIO. I have connected an I2C slave to TRACED0 (PE3) and TRACED2 (PE5), doing I2C in software. But it seems that these pins are controlled by something else, I can't get my I2C working. The code is not the problem, it works on other GPIOs on the extension connector.

Is it possible to use these pins as GPIO? And how is the embedded RLINK connected to my target MCU? I can't find the schematics for it.

floppes · 2013-02-25 20:43:57

I solved my problem

The TRACEDx pins can be freely used as GPIO. It didn't work in my case because I thought VCC3 on the TRACE connector was the same as VCC3V1. It actually isn't and therefore my I2C slave was not powered. VCC3 must be an external source.

# 1 2013-02-24 10:07:36 Use TRACE connector as GPIO

Use TRACE connector as GPIO

# 2 2013-02-25 20:43:57 Use TRACE connector as GPIO

Re: Use TRACE connector as GPIO

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