I can't write to my STM32G03 when connect in Hot plug mode, and I get DEV_TARGET_CMD_ERR whenever I try to connect in Normal mode.

LMeye.1 · ‎2021-11-08

I am trying to directly write to some STM32G03 chips.

I have an "STM32G030J6M6" and a "STM32G031F6P6" but I am unable to write to them.

I can connect to them, using the CubeProgrammer, but only in "Hot plug" mode, and when I try to write anything, like flash or erase, it just disconnects.

If I try erasing it, it says "Please verify write protection" but there shouldn't be any, as this is a new chip.

If I try and connect to the chip in "Normal" mode, it just gives me an error, saying "DEV_TARGET_CMD_ERR"

I have tried holding down the reset pin, but that doesn't help. When I release it, it just gives me the same error.

This is the output when I try to connect in normal mode.

09:42:02 : ST-LINK SN  : 36FF73065648343826450743
09:42:02 : ST-LINK FW  : V2J38S7
09:42:02 : Board       : --
09:42:02 : Voltage     : 1.50V
09:42:02 : Error: ST-LINK error (DEV_TARGET_CMD_ERR)

This is the output for "Hot plug" + erase.

09:45:33 : ST-LINK SN  : 36FF73065648343826450743
09:45:33 : ST-LINK FW  : V2J38S7
09:45:33 : Board       : --
09:45:33 : Voltage     : 1.50V
09:45:33 : SWD freq    : 4000 KHz
09:45:33 : Connect mode: Hot Plug
09:45:33 : Reset mode  : Hardware reset
09:45:33 : Device ID   : 0x466
09:45:33 : Revision ID : Rev 1.1
09:45:33 : UPLOADING OPTION BYTES DATA ...
09:45:33 :   Bank          : 0x00
09:45:33 :   Address       : 0x40022020
09:45:33 :   Size          : 112 Bytes
09:45:33 : UPLOADING ...
09:45:33 :   Size          : 1024 Bytes
09:45:33 :   Address       : 0x8000000
09:45:33 : Read progress:
09:45:33 : Data read successfully
09:45:33 : Time elapsed during the read operation is: 00:00:00.008
09:45:38 : MASS ERASE ... 
09:45:38 : Error: Mass erase operation failed.Please verify flash protection
09:45:38 : Error: Unable to get core ID
09:45:38 : Warning: Connection to device 0x466 is lost
09:45:38 : Disconnected from device.

LMeye.1 · ‎2021-11-08

The voltage is not being pulled down.

When giving the board 3.3v, I can measure the correct voltage on the target (3.3v).

Using the VAPP pins on the programmer, it only outputs 2.4v, which is the same as I measure on the target.

The CubeProgrammer says "Voltage : 2.40V" when using the VAPP pins for power, but if I directly give the target 3.3v, from an external power supply, without having any power pins on the programmer connected, then the CubeProgrammer says "Voltage : 1.50V".

Using VAPP pins:

15:25:42 : ST-LINK SN  : 36FF73065648343826450743
15:25:42 : ST-LINK FW  : V2J38S7
15:25:42 : Board       : --
15:25:42 : Voltage     : 2.40V
15:25:42 : Error: ST-LINK error (DEV_TARGET_CMD_ERR)

Using external power supply (3.3v):

15:32:24 : ST-LINK SN  : 36FF73065648343826450743
15:32:24 : ST-LINK FW  : V2J38S7
15:32:24 : Board       : --
15:32:24 : Voltage     : 1.50V
15:32:24 : Error: ST-LINK error (DEV_TARGET_CMD_ERR)

LMeye.1 · ‎2021-11-08

That worked.

Nowhere I looked, could I find that I needed to short those pins, but now I can talk to the chip.

Thank you very much.