[STM32] No voltage on VDD_TARGET pin

bastik * · ‎2018-04-12

Posted on April 12, 2018 at 23:51

I have a microcontroller (STMF103RET) mounted to the adapter.

I would like to program it using the ST-Linkv2 programmer from the Nucleo board (STM32F103RB).

According to the instructions, I disconnected the CN2 jumpers and connect SWD pins to adapter. After checking, I saw that there is no voltage on the VDD_TARGET pin.

Is it normal or something I'm doing wrong?

#stm32-f1 #st-link-v2-1

Andrew Neil · ‎2018-04-13

Posted on April 13, 2018 at 09:34

Table 5 - immediately above that picture you posted - describes the pins in CN4:

http://www.st.com/content/ccc/resource/technical/document/user_manual/98/2e/fa/4b/e0/82/43/b7/DM00105823.pdf/files/DM00105823.pdf/jcr:content/translations/en.DM00105823.pdf

Note that VDD_TARGET comes from the application; ie, from your target board - it is not a supply to the target!

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.