This section is about the original Raspberry Pi Pico board. The "1" was added retroactively to the name as more boards were released and "Raspberry Pi Pico" became a generic name for the brand.
Has Serial wire debug debug pre-soldered. Why would you ever get one without unless you are a clueless newbie like Ciro Santilli?!?!
It is however possible to solder it yourself on Raspberry Pi Pico W.
You can connect form an Ubuntu 22.04 host as:When in but be aware of: Raspberry Pi Pico W freezes a few seconds after after screen disconnects from UART.
screen /dev/ttyACM0 115200screen, you can Ctrl + C to kill main.py, and then execution stops and you are left in a Python shell. From there:- Ctrl + D: reboots
- Ctrl + A K: kills the GNU screen window. Execution continues normally
Other options:
- ampy
runcommand, which solves How to run a MicroPython script from a file on the Raspberry Pi Pico W from the command line?
Then there are two appraoches:
- thonny if you like clicking mouse buttons:and select the interpreter as the Pico.
pipx install thonny - ampy if you like things to just run from the CLI: How to run a MicroPython script from a file on the Raspberry Pi Pico W from the command line?
The first/only way Ciro could find was with ampy: stackoverflow.com/questions/74150782/how-to-run-a-micropython-host-script-file-on-the-raspbery-pi-pico-from-the-host/74150783#74150783 That just worked and it worked perfectly!
pipx install adafruit-ampy
ampy --port /dev/ttyACM0 run blink.pyInstall on Ubuntu 22.04:
python3 -m pip install --user adafruit-ampyBibliography:
Ctrl + X. Documented by running
help repl from the main shell.Examples at: Raspberry Pi Pico W MicroPython example.
Examples at: Raspberry Pi Pico W MicroPython example.
An upstream repo at: github.com/raspberrypi/pico-micropython-examples
Some generic Micropython examples most of which work on this board can be found at: Section "MicroPython example".
The examples can be run as described at Program Raspberry Pi Pico W with MicroPython.
- rpi-pico-w/upython/led_on.py: turn on-board LED on and leave it on forever. Useful to quickly check that you are still able to update the firmware.
- rpi-pico-w/upython/led_off.py: turn on-board LED off and leave it off forever
- rpi-pico-w/upython/pwm.py: pulse width modulation. Using the same circuit as the rpi-pico-w/upython/blink_gpio.py, you will now see the external LED go from dark to bright continuously and then back
Blink on-board LED. Note that they broke the LED hello world compatibility from non-W to W for God's sake!!!
The MicroPython code needs to be changed from the Raspberry Pi Pico 1, forums.raspberrypi.com/viewtopic.php?p=2016234#p2016234 comments:
Same as the more generic micropython/blink_gpio.py but with the onboard LED added.
Any
print() command ends up on the USB, and is shown on the computer via programs such as ampy get back.However, you can also send data over actual UART.
We managed to get it working based on: timhanewich.medium.com/using-uart-between-a-raspberry-pi-pico-and-raspberry-pi-3b-raspbian-71095d1b259f with the help of a DSD TECH USB to TTL Serial Converter CP2102 just as shown at: stackoverflow.com/questions/16040128/hook-up-raspberry-pi-via-ethernet-to-laptop-without-router/39086537#39086537 for the RPI.
We connect Pin 0 (TX), Pin 1 (RX) and Pin 2 (GND) to the DSD TECH, and the USB to the Ubuntu 25.04 host laptop.
The hello world is with a potentiometer: extremes on GND and VCC pins of the Pi, and middle output on pin GIO26, then as you turn the knob, the uart value goes from about 0 to about 64k.
In Ciro's ASCII art circuit diagram notation:
RPI_PICO_W__gnd__gpio26__5v
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P__1____2_______3Ubuntu 22.04 build just worked, nice! Much feels much cleaner than the Micro Bit C setup:
sudo apt install cmake gcc-arm-none-eabi libnewlib-arm-none-eabi libstdc++-arm-none-eabi-newlib
git clone https://github.com/raspberrypi/pico-sdk
cd pico-sdk
git checkout 2e6142b15b8a75c1227dd3edbe839193b2bf9041
cd ..
git clone https://github.com/raspberrypi/pico-examples
cd pico-examples
git checkout a7ad17156bf60842ee55c8f86cd39e9cd7427c1d
cd ..
export PICO_SDK_PATH="$(pwd)/pico-sdk"
cd pico-exampes
mkdir build
cd build
# Board selection.
# https://www.raspberrypi.com/documentation/microcontrollers/c_sdk.html also says you can give wifi ID and password here for W.
cmake -DPICO_BOARD=pico_w ..
make -jThen we install the programs just like any other UF2 but plugging it in with BOOTSEL pressed and copying the UF2 over, e.g.:Note that there is a separate example for the W and non W LED, for non-W it is:
cp pico_w/blink/picow_blink.uf2 /media/$USER/RPI-RP2/cp blink/blink.uf2 /media/$USER/RPI-RP2/Also tested the UART over USB example:You can then see the UART messages with:
cp hello_world/usb/hello_usb.uf2 /media/$USER/RPI-RP2/screen /dev/ttyACM0 115200TODO understand the proper debug setup, and a flash setup that doesn't require us to plug out and replug the thing every two seconds. www.electronicshub.org/programming-raspberry-pi-pico-with-swd/ appears to describe it, with SWD to do both debug and flash. To do it, you seem need another board with GPIO, e.g. a Raspberry Pi, the laptop alone is not enough.
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