ST25R3911B-DISCO to STLink-V2 - Unknown Device Id

[Ivan Smolin]

Posted on January 25, 2018 at 12:18

I need to re-upload original firmware to ST25R3911B-DISCO with STLink-V2.

(Discovery GUI is not applicable for me here, I need to do it exactly with STLink-V2)

I connected with wires:

- 20-pin's VCC (1) to 10-pin's VTREF (1)

- 

20-pin's GND (4) to 10-pin's GND (3)

-

20-pin's GND (

6

) to 10-pin's GND (5)

- 20-pin's TRST (

3

) to 10-pin's NC (9)

- 

20-pin's

SWDIO(

7) 

to 10-pin's

SWDIO(2)

- 

20-pin's

SWCLK(9

) 

to 10-pin's

SW

CLK

(4)

- 

20-pin's

SWO(13

) 

to 10-pin's

SWDIO(2)

- 

20-pin's TDI (5) to 10-pin's TDI (8)

When I connecting both devices to same PC and running utility and trying to connect, it connects, ST-Link V2 has green LED light, but next I seeing: 'Unknown device id' and after clicking 'OK' it has red LED light again.

I tried Target -> Settings... with all combinations of JTAG/SWD and connection modes.and no effect.

Help me please! Deadline to this task is too near!

[Ulysses HERNIOSUS · Accepted solution]

Posted on January 29, 2018 at 10:42

Hi Ivan,

no need for debugger here, just follow the User Manual:

In UM2177 chapter 2.3 of

/external-link.jspa?url=http%3A%2F%2Fwww.st.com%2Fcontent%2Fst_com%2Fen%2Fproducts%2Fembedded-software%2Fst25-nfc-rfid-software%2Fstsw-st25rhtml

you will find a description how to update the board from the GUI (without using an SWD/JTAG) debugger even if the current firmware does not communicate with the GUI (Using the System Loader DFU mode).

We know that e.g. this adapter works:

https://www.segger.com/products/debug-probes/j-link/accessories/adapters/9-pin-cortex-m-adapter/

Maybe your current application on the MCU messes with the debug pins, you could try to put the STM32 into bootloader mode before connecting with the debugger: Press Boot button, keep it pressed, Press Reset button, release it, then release Boot button. Now youmightbe able to connect with debugger again.

Ulrich

[Ivan Smolin]

Posted on January 29, 2018 at 11:08

Thank you.

Give me a correct schematic of this adapter please.