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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| | |
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P__1____2_______3Under: micropython
Same behavior as micropython/blink_gpio.py.
Bibliography:
Build worked:but flash failed:Related: mattoppenheim.com/2018/06/24/using-udev-to-remove-the-need-for-sudo-with-the-bbc-microbit
west build -d build/microbit/hello_world -b bbc_microbit samples/hello_worldwest flash -d build/microbit/hello_worldThe build also generates a .hex file by default, and we've tried to flash it manually with:but we failed to see it do anything with zephyr/blink_gpio.c, so not sure if the flashing was broken or if the code was broken, or if we didn't find the IO pins correctly.
cp build/microbit/hello_world/zephyr/zephyr.hex /media/ciro/MICROBIT/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.
Same as the more generic micropython/blink_gpio.py but with the onboard LED added.
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:
Tested on Ubuntu 25.04,
sudo apt install libusb-1.0-0-dev
git clone https://github.com/raspberrypi/pico-sdk
git clone https://github.com/raspberrypi/picotool
cd picotool
git checkout de8ae5ac334e1126993f72a5c67949712fd1e1a4
export PICO_SDK_PATH="$(pwd)/../pico-sdk"
mkdir build
cd build
cmake ..
cmake --build . -- -j"$(npro)" VERBOSE=1build/picotool so copy it somewhere in your PATH like:cp picotool ~/binsudo ~/bin/picotool load -f build/zephyr/zephyr.uf2No accessible RP2040 devices in BOOTSEL mode were foundpico_enable_stdio_usb(blink 1)Never unplug your Raspberry Pi Pico again by deltocode
. Source. The Zephir LED blinker example does not work on the Raspberry Pi Pico W because the on-board LED is wired differently. But the hello world works and with:host shows:Nice!
screen /dev/ttyUSB0 115200*** Booting Zephyr OS build v4.2.0-491-g47b07e5a09ef ***
Hello World! rpi_pico/rp2040This 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.
This is a major design flaw, that the only easy default way is that you have to unplug, press bootsel, replug:
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