debuggingstm32microcontrollerstm32cubeideswd

STM32F103RET6, ST-LINK V2, DEV_TARGET_CMD_ERR, SWD does not work properly

I have a custom STM32 board which has basically only the needed components to flash and use an STM32F103RET6 on board. This means, there are only a few capacitors for voltage stability, an 8MHz quarz + circuitry, and a few connectors on it.

I have the SWDIO, SWCLK and NRST lines connected through a 100 Ohms resistor exposed to a connector, so I can use them to program the device.

Now the problem ist, that I cannot connect to the device via STM32CubeProgrammer, nor the CLI, nor my IDE of choice (Keil uVision).

When I use my ST-LINK V2, connect it to the board and my pc, and then press "connect" in the program, I get the error DEV_TARGET_CMD_ERR.

There is literally no explanation of this error anywhere, other than "hardware issues". How can that be, if the lines are directly connected through a 100 Ohms resistor to the pins?

I then proceeded to try out the CLI and it didnt work either. My Keil uVision just throws the error "Internal Command Error".

So I set up a logic analyzer and found out, that the device is actually communicating with my ST-LINK:

It is basically doing this:

  1. Line Reset
  2. Read IDCODE (successfully)
  3. Wants to write to CTRL/STAT (gets ACK WAIT as response)
  4. Line Reset
  5. Repeat 1-4 ca. 100 times
  6. Read IDCODE
  7. Read from CTRL/STAT (successfully, response: 0xF0000000)
  8. Somehow stops doing anything and throws the error mentioned above.

My BOOT0 pin is floating, if that is of interest.

I have no idea how to proceed from here. I cant even connect to the device, however, the device is clearly communicating with the chip.

I checked a chip of my batch on a Evalboard (Nucleo), and it promptly connected and read the memory. So the chips are not defect.

Do I have to remove any write protection or something which the debug interface does automatically on the Nucleo-Board, or why cant I use my chip at all?

Thank you very much in advance!

This is the analysis of the SWD communication:

Time    Type    R/W AP/DP   Register    Request byte    ACK WData   WData details
-0.000  Line reset                          
0.000   Line reset                          
0.000   Operation   read    DebugPort   IDCODE  0xA5    OK  0x1BA01477  DESIGNER=0x477, PARTNO=0xBA01, Version=0x1
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.000   Line reset                          
0.000   Line reset                          
0.001   Operation   read    DebugPort   IDCODE  0xA5    OK  0x1BA01477  DESIGNER=0x477, PARTNO=0xBA01, Version=0x1
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.001   Line reset                          
0.001   Line reset                          
0.002   Operation   read    DebugPort   IDCODE  0xA5    OK  0x1BA01477  DESIGNER=0x477, PARTNO=0xBA01, Version=0x1
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.002   Line reset                          
0.002   Line reset                          
0.002   Operation   read    DebugPort   IDCODE  0xA5    OK  0x1BA01477  DESIGNER=0x477, PARTNO=0xBA01, Version=0x1
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Operation   write   DebugPort   CTRL/STAT   0xA9    WAIT        
0.003   Line reset                          
0.003   Line reset                          
0.003   Operation   read    DebugPort   IDCODE  0xA5    OK  0x1BA01477  DESIGNER=0x477, PARTNO=0xBA01, Version=0x1
0.004   Operation   write   DebugPort   ABORT   0x81    OK  0x0000001F  ORUNERRCLR=1, WDERRCLR=1, STKERRCLR=1, STKCMPCLR=1, DAPABORT=1
0.004   Operation   read    DebugPort   CTRL/STAT   0x8D    OK  0xF0000000  CSYSPWRUPACK=1, CSYSPWRUPREQ=1, CDBGPWRUPACK=1, CDBGPWRUPREQ=1, CDBGRSTACK=0, CDBGRSTREQ=0, TRNCNT=0x000, MASKLANE=0x0, WDATAERR=0, READOK=0, STICKYERR=0, STICKYCMP=0, TRNMODE=Normal, STICKYORUN=0, ORUNDETECT=0

Hardware:

This is the hardware basically. Schematics

Solution

  • We found the issue. The Problem was that VDDA pin had not enough energy supplied to it. This means, it was a hardware issue.

    To make clear what the actual problem was and why we didnt detect it:

    We checked all VDD(A) pins and found that every pin had the right voltage supplied. However, in the gerber files we discovered that the VDDA pin via was not connected properly to the 3.3V plane. There was a huge resistance (in this case 600kΩ) between the 3.3V rail and the VDDA pin. We measured the right voltage at the VDDA pin because there was a capacitor and it had enough time to charge up. Thus we measured the correct voltage. However, once the uC started to draw actual power, the cap didnt provide enough energy/current and the uC couldnt start up. That also explained the error message from JLINK "Couldnt start up DAP".

    Ergo: DEV_TARGET_CMD_ERR is probably a hardware issue.