Ciro Santilli @cirosantilli 37

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.

Then on the host laptop I run:

screen /dev/ttyUSB0 9600

and a counter shows up there just fine!

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rpi-pico-w/upython/blink_gpio.py Created 2025-07-26 Updated 2025-07-27

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Same as the more generic micropython/blink_gpio.py but with the onboard LED added.

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rpi-pico-w/upython/blink.py 2025-07-26

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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:

Unlike the original Raspberry Pi Pico, the on-board LED on Pico W is not connected to a pin on RP2040, but instead to a GPIO pin on the wireless chip.

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Program Raspberry Pi Pico W with X 2025-07-26

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picotool 2025-07-26

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github.com/raspberrypi/picotool

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=1

and the executable is there under build/picotool so copy it somewhere in your PATH like:

cp picotool ~/bin

and then trying to use a Zephyr example:

sudo ~/bin/picotool load -f build/zephyr/zephyr.uf2

fails with:

No accessible RP2040 devices in BOOTSEL mode were found

TODO: how to avoid that? youtu.be/tRXLxrtfU_s?t=207 gives a workaround if you are using the Pico SDK by adding to CMakeLists.txt:

pico_enable_stdio_usb(blink 1)

but how to do it in Zephyr? Video description says:

make sure that your program initializes the USB code via a call to "stdio_init_all()".

but again how to do that from Zephyr? It appears that this only works if the code currently running has support for the feature:

forums.raspberrypi.com/viewtopic.php?t=361359

Video 1.

Never unplug your Raspberry Pi Pico again by deltocode

. Source.

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CIA 2010 covert communication websites / The CIA Secretly Ran a Star Wars Fan Site by Joseph Cox 2025-07-26

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www.404media.co/the-cia-secretly-ran-a-star-wars-fan-site/

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Run Zephyr on Raspberry Pi Pico W 2025-07-26

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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:

screen /dev/ttyUSB0 115200

host shows:

*** Booting Zephyr OS build v4.2.0-491-g47b07e5a09ef ***
Hello World! rpi_pico/rp2040

Nice!

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Raspberry Pi Pico 1 2025-07-26

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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.

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Flash the Raspberry Pi Pico Created 2025-07-26 Updated 2025-07-27

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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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Jerry Chun Shing Lee 2025-07-26

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Involved in the CIA 2010 covert communication websites affair.

2018-01-16
- www.nbcnews.com/news/us-news/ex-cia-officer-jerry-chun-shing-lee-suspected-spying-china-n838186 Ex-CIA officer Jerry Chun Shing Lee suspected of spying for China - NBC News
- www.politico.com/f/?id=00000161-05bd-dcd4-a96b-35bda0f10001 Affidavit for Jerry Chun Shin Lee
2018-01-20 www.nbcnews.com/news/china/cia-china-turncoat-lee-may-have-compromised-u-s-spies-n839316 Alleged CIA China turncoat Lee may have compromised U.S. spies in Russia too
2019-11-22 www.justice.gov/archives/opa/pr/former-cia-officer-sentenced-conspiracy-commit-espionage Former CIA Officer Sentenced for Conspiracy to Commit Espionage - US Dept of Justice

Figure 1.
Jerry Chun Shing Lee in blue tie at the unveiling of Leonardo da Vinci's 'Salvator Mundi' painting at the Christie's showroom in Hong Kong on Oct. 13, 2017
. Source.

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Zephyr hello world example Created 2025-07-26 Updated 2025-07-27

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Uses printf to print some bytes somewhere, usually the first UART of the board.

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Zephyr blinky example Created 2025-07-26 Updated 2025-07-27

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Blinks the on-board LED if the board has one.

Does not work on:

Micro Bit: build fails
Raspberry Pi Pico W: build works but does nothing because the LED is connected differently

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Run Zephyr on Raspberry Pi Pico 2025-07-26

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Zephyr docs: docs.zephyrproject.org/latest/boards/raspberrypi/rpi_pico/doc/index.html

Note that the LED blinker example does not work on the Raspberry Pi Pico W, see also: Run Zephyr on Raspberry Pi Pico W.

You can speed up the debug loop a little bit by plugging the Pi with BOOTSEL selected, and then running:

west flash --runner uf2

This flashes the image, and immediately turns off BOOTSEL mode and runs the program.

However to run again you need to unplug the USB and re-plug with BOOTSEL again so it is still painful.

Video 1.

Let's run Zephyr RTOS on Raspberry Pi Pico. Ep.1 by Mr. Green's Workshop

. Source.

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Raspberry Pi Pico getting started 2025-07-26

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Getting started on Ubuntu 25.04: see: Program Raspberry Pi Pico W with X.

Then ignore the other steps from the tutorial, as theese use the picozero package, which is broken with this error: github.com/raspberrypilearning/getting-started-with-the-pico/issues/57

AttributeError: module 'pkgutil' has no attribute 'ImpImporter'. Did you mean: 'zipimporter'

and uses picozero specific code. Rather, just use our examples from rpi-pico-w.

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Run Zephyr on X 2025-07-26

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Zephyr example 2025-07-26

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Exascale hypothesis 2025-07-26

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The "exascale hypothesis" is a name made up by Ciro Santilli to refer to the hypothesis that the real-time human brain simulation becomes possible at exascale computing.

It is a simple extrapolation from the number of synapses in the human brain (

1 0^{15}

) times the number of times each neuron fires per second.

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LED blinker 2025-07-26

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This is the hello world program of microcontrollers: blinking and LED! Many boards have an on-board LED, making this a convenient hello world that does not require any external components.

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