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Forget the Arduino IDE! I would recommend using Visual Studio Code with the C/C++, Arduino and Cortex-Debug extensions. The Raspberry Pi Pico acting as programmer-debugger is called Picoprobe. It also features redirection of the Serial1 port. The installation process is detailed at the earlephilhower/arduino-pico page. You may need to build OpenOCD with specific options. It is easy and works fine. Debugging is performed from Visual Studio Code. Obviously, you can use manual command-line GDB and OpenOCD. The only caveat is Serial1 should be used instead of Serial to print to the console. Please find some pointers below. References: https://code.visualstudio.com https://marketplace.visualstudio.com/items?itemName=vsciot-vscode.vscode-arduino https://marketplace.visualstudio.com/items?itemName=marus25.cortex-debug https://github.com/earlephilhower/arduino-pico#debugging-with-picoprobepico-debug-openocd-and-gdb https://github.com/raspberrypi/openocd https://embeddedcomputing.weebly.com/raspberry-pi-pico-rp2040-board.html https://embeddedcomputing.weebly.com/debugging-against-the-pico-board.html
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That's great! I bought a 2nd one expressedly for that purpose although I haven't used it yet (don't have my soldering equipment out of storage yet so the debug header isn't mounted yet). Do you have any links or guides on how to use this with Arduino? (does it come with GDB and is there a GUI or is it all CLI driven GDB usage?) -
At USD4 apiece, you can use the second Raspberry Pi Pico as a programmer-debugger. It works really well!
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I'll admit I'm a little embarrassed that I didn't look into other offerings, like the Feather. Probably would've skipped the Pico. Alas, I have 2 of them now so might as well proceed with what I have. edit: Although, I see the Feather doesn't have castellated pins like the Pico and knockoffs do, so that's a factor. Maybe not though. Soldering castellated pins means you can't use the board space under the Pico for SMD parts, while through-hole gives you a small amount of clearance for some low-profile SMD parts.
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Thank you for the pointer to the Challenger RP2040. It is nice to see the designers refrained from reinventing the wheel and took the Feather form-factor. Same for the LTE (SARA-R410M) or the WiFi radio (ESP8265). The Raspberry Pi Pico RP2040 is a very good board and I strongly recommend the Earle Philower's Pico core for Arduino over the official Arduino mbed-based implementation. There is a whole eco-system built around the Raspberry Pi Pico with many interesting kits. Let's me mention the E-Paper Display Pico Kit (EPDK), an all-in-one e-paper kit from Pervasive Displays.
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