Pinout
Check the RPi Pico Pinout Labels
| Zero Pin | Debugger Function | <-> | Pico Pin | Target Function | Notes |
|---|---|---|---|---|---|
| 9 | N/A | ||||
| 10 | SWCLK | CLK | SWCLK | ||
| 11 | SWDIO | DIO | SWDIO | ||
| 12 | UART0 TX | 1 | UART RX | 1 | |
| 13 | UART0 RX | 0 | UART TX | 1 |
How to use
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Download the UF2 firmware from the Release page.
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Flash it on the RP2040-Zero:
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With the USB cable disconnected
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Keep pressed the BOOT button
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Connect the USB cable
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An external memory device will appear
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Drag and drop the
zephyr.uf2file downloaded before
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Connect the two boards as shown above
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[OPTIONAL] Test with
pyOCD-
Install with
sudo apt install python3-pyocd -
Check the device with:
pyocd list
$ pyocd list # Probe/Board Unique ID Target ---------------------------------------------------------------------- 0 Zephyr Project Zeroprobe CMSIS-DAP xxxxxxxxxxxxxxxx n/a -
SWD/DAP
This should be automatically detected by your SDK if it uses openOCD or pyOCD.
TTY
On Linux this will expose two serial ports: one reporting the logs of the debugger, and one forwarding the target UART.
Assuming you don’t have anything else connected and that you have tio installed:
$ ls /dev
# this will show all the devices connected, we are interested in:
# ttyACM0 = UART bridge
# ttyACM1 = zeroprobe logs
$ tio /dev/ttyACM0
Fixes
In case of device not detected:
- Check with lsusb:
$ lsusb -d 2fe3: Bus 005 Device 005: ID 2fe3:2ef0 NordicSemiconductor Zeroprobe CMSIS-DAP -
Add the udev rules for OpenOCD
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sudo nano /etc/dev/rules.d/60-openocd.rules -
Copy the content of this file
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sudo udevadm control --reload
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TODO
- Use the addressable RGB LED to display information
Build
Requisites:
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Zephyr SDK 1.0.1
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Zephyr 4.4
Credits
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Images created with Fritzing
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Boards footprint created by Vanepp: RP2040-Zero & RPi Pico
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Favicon from “Noto Emoji Font”