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ST-Link and the UART connection

Uwe Bonnes
Principal III
Posted on October 10, 2013 at 15:12


recent discovery boards have a jumperable UART connection between the debugger and the target device. Is there any way to read/write to ther serial link with the PC?

#pc #uart #stlink
Associate III
Posted on January 24, 2016 at 20:04

I assume you are talking about this part (for example on the stm32f429-disco).


It's not a jumper per se (at least on the stm32f429-disco); just a solder bridge that you can fill and connect to PA9/10 if you want.  I was scratching my head also, until I found in the ST-Link manual that the USART pins on ST-Link are ''reserved'' (meaning: not implemented yet).

Someone please correct me if I am wrong.  So far, the most direct answer for connecting to stm32f429-disco USART is


Posted on January 24, 2016 at 20:38

This is a bit of an old post.

The ''Newer'' DISCO's in 2016 context support mbed, and have a bigger F103 part and ST-LINK V2.1 firmware that support a VCP which the drivers instantiate a COMx port on the Windows side.

The NUCLEO's have supported this for a while, the F746 and F469 DISCO also support it. The older F40x and F429 DISCO do not.

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