How to use the Nucleo-L432KC as a ST-LINK to program a target board with a STM32 ?

ATrem.1 · ‎2020-03-12

Hello,

Is it possible to connect a target board with a STM32 to a Nucleo-L432KC kit and download the firmware inside the STM32 ? The connector CN2 is only to programm the STM32F103, it's not a connector for the target ?

thanks

Mike_ST · ‎2020-03-12

As you said, CN2 is not for the target MCU but for the F103.

I don't see an easy way to access the ST-Link signals on that board.

Better use a stand-alone ST-Link.

ATrem.1 · ‎2020-03-13

Hi,

So it's possible but not so easy.

First thing is to disconnect the L432KC on the Nucleo board, ie JP1 must be open, like this the L432KC have no power and must be in HZ.

My target need less than 40mA on the 3.3V, so I use the GND and the +3V3_ST_LINK for the power supply of my target board.

After, I soldering to wires on the QFP footprint arround the L432KC in QFN package, to have the SWDIO (pin 23) and the SWCLK (pin 24). Those 2 wires are connected to my board, respectively with SWDIO and SWCLK.

After, Cube Programmer is connected to my target board.😉