"OpenOCD init failed" when attempting to upload via picoprobe

[neilenns]

I'm trying to get the awesome debugging support introduced with #36 working but am struggling with even getting upload to work on Windows.

• I have two Picos wired as shown in the Getting Started guide on page 64.
• Pico A has picoprobe installed from https://datasheets.raspberrypi.com/soft/picoprobe.uf2
• zadig was used to install the libusb-win32 driver and Pico A correctly shows up as a Picoprobe (Interface 2) in device manager

Here is how my platformio.ini is configured:

[env:pico]
platform = https://github.com/maxgerhardt/platform-raspberrypi.git
board = pico
framework = arduino
board_build.core = earlephilhower
board_build.filesystem_size = 0M
build_flags = 
    -fpermissive
monitor_speed = 115200
lib_deps = adafruit/Adafruit TCA8418@^1.0.1
debug_tool = picoprobe
upload_protocol = picoprobe
debug_init_break = tbreak loop

Whenever I attempt to upload from VSCode/PlatformIO I get the following:

CURRENT: upload_protocol = picoprobe
Uploading .pio\build\pico\firmware.elf
Open On-Chip Debugger 0.11.0-g610f137 (2022-02-11-13:57)
Licensed under GNU GPL v2
For bug reports, read
        http://openocd.org/doc/doxygen/bugs.html
debug_level: 1

adapter speed: 5000 kHz

adapter speed: 1000 kHz

in procedure 'program'
** OpenOCD init failed **
shutdown command invoked

I've triple checked my wiring between the two boards and it appears to be correct. Any suggestions for what might be leading to this error?

[neilenns]

I tried updating my Raspberry Pi platform installation this morning to ensure it has the updated tools from #36. Unfortunately that didn't change anything and I still get the upload error.

Interestingly a friend has also tried this and it worked for them, so I'm at a loss for what the difference is :(

[neilenns]

Connected the target Pico directly to power via USB and it worked! I guess my board-to-board power wiring was wrong :(