Program custom target with nucleo st link

[AHöfl.1]

Hi

I have a Nucleo F103RB where I would like to use the st link to program my custom board with a ST321F03. I removed the jumpers on CN2 and connected SWDIO, SWCLK and GND.

When I try to connect via SWD with CubeIDE I get "Error in initializing ST-LINK device.

Reason: No device found on target."

I also removed the 0Ohm resistor SB12 without any luck.

Is it necessary to connect also NRST?

Any help is highly appreciated.

Thx

Andy

[Tesla DeLorean]

Generally it means the target is inoperable, check supplies and orientation. Check level seen on target NRST.

The NRST doesn't need to be connected to the ST-LINK, should work without, although "Connect Under Reset" won't have control it expects.

Y​ou have a standalone ST-LINK you can try? That will need VTarget connected.

O​ther signs of life would be to use USART1 PA9/PA10 in System Loader mode. Sending 0x7F data pattern at 9600 8E1

[AHöfl.1]

Hi

First of all thanx for the quick reply.

Unfortunately I do not have an ST-Link at my disposal.

But generally it means, connecting SWCLK, SWDIO and GND should be enough?

Do I really need to remove the SB12 resistor?

Anything wrong with my schematics maybe? (I am quiet new to the HW Topic)

Cheers

Andy

[AHöfl.1]

Hi

First of all thanx for the quick reply.

Unfortunately I do not have an ST-Link at my disposal.

But generally it means, connecting SWCLK, SWDIO and GND should be enough?

Do I really need to remove the SB12 resistor?

Anything wrong with my schematics maybe? (I am quiet new to the HW Topic)

Cheers

Andy