Sparkfun pro micro - rp2350 debug problem

Development Boards Raspberry Pi
1

i hooked a pico debug probe (with the latest firmware) up to the units C and D pads and tried:

openocd -f interface/cmsis-dap.cfg -f target/rp2040.cfg -c “adapter speed 5000”

i got the following error:

Info : Listening on port 6666 for tcl connections

Info : Listening on port 4444 for telnet connections

Info : Using CMSIS-DAPv2 interface with VID:PID=0x2e8a:0x000c, serial=E6633861A39C662C

Info : CMSIS-DAP: SWD supported

Info : CMSIS-DAP: Atomic commands supported

Info : CMSIS-DAP: Test domain timer supported

Info : CMSIS-DAP: FW Version = 2.0.0

Info : CMSIS-DAP: Interface Initialised (SWD)

Info : SWCLK/TCK = 0 SWDIO/TMS = 0 TDI = 0 TDO = 0 nTRST = 0 nRESET = 0

Info : CMSIS-DAP: Interface ready

Info : clock speed 5000 kHz

Error: Failed to connect multidrop rp2040.dap0

any clues as how to proceed? i tried using the same cmd line as above with rp2350.cfg but there was no config file for that

thanks for help

2

Hmmm…I just have some general suggestions

Check physical connections:
Make sure that the Pico debug probe is correctly connected to the target board’s SWD pins (SWCLK, SWDIO, GND, and VSYS).

Try a lower clock speed:
The 5000 kHz clock speed might be too high. Try reducing it:

openocd -f interface/cmsis-dap.cfg -f target/rp2040.cfg -c "adapter speed 1000"

Update OpenOCD:
Ensure you’re using the latest version of OpenOCD that supports the RP2350

  1. Use verbose output:
    Add the -d flag to get more detailed debug information:
openocd -d -f interface/cmsis-dap.cfg -f target/rp2040.cfg -c "adapter speed 1000"

Try a different USB port/cable (can resolve some connection issues)

3

It is required to use rp2350.cfg for the RP2350. If you don’t have that file, you probably don’t have the latest OpenOCD installed. Please follow Raspberry Pi’s instructions in Appendix A here: https://datasheets.raspberrypi.com/pico/getting-started-with-pico.pdf

4

Thanks for all the help.

I used the getting-started-with-pico guide and was able to compile and install the rpi openocd program on my Mac (m1). I used an rpi debug probe to connect to the sparkfun rp2350 board.

Then i used the arm-none-eabi-gdb program (I used brew to install it) to connect to the openocd server.

It worked perfectly!