External MCU programming STM32

Bruno Sena · ‎2017-12-21

Posted on December 21, 2017 at 13:25

I've an Nucleo-f091rc, and i need using this board to programming an external STM32F070, using SWDIO, I've connected SWDIO, SWDCLK, NRST and GND. My external MCU have external 3.3V. When I try to connect I receive the mesage No target connected.

Zt Liu · ‎2017-12-21

Posted on December 22, 2017 at 03:06

As Clive said, take a quick look on this pic.

Maybe re-check your VDDA/VDD pin and NRST Pin with a oscilloscope.

(I've got a wired L053 Nucleo Board, the st-link keeping resetting the target MCU every few hundred msec, after update the firmware of st-link this resetting action disappeared somehow.)

Bruno Sena · ‎2017-12-22

Posted on December 22, 2017 at 12:41

Sorry All.

I'm using the wrong pins to connect the MCU to my pcb board.

Pin 1 is the smaller, concave mark in the lower-left, and I'm using the pin 1 on

larger mark in the upper-right.

Anyway my external MCU works fine now.

Thank you All.