Source: cirosantilli/program-raspberry-pi-pico-w-with-c

= Program Raspberry Pi Pico W with C
{tag=MicroPython}

* https://www.raspberrypi.com/documentation/microcontrollers/c_sdk.html
* https://github.com/raspberrypi/pico-sdk
* https://github.com/raspberrypi/pico-examples The key hello world examples are:
  * https://github.com/raspberrypi/pico-examples/tree/a7ad17156bf60842ee55c8f86cd39e9cd7427c1d/hello_world/usb
  * https://github.com/raspberrypi/pico-examples/tree/a7ad17156bf60842ee55c8f86cd39e9cd7427c1d/blink

<Ubuntu 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 -j
``

Then we install the programs just like any other <UF2> but plugging it in with BOOTSEL pressed and copying the UF2 over, e.g.:
``
cp pico_w/blink/picow_blink.uf2 /media/$USER/RPI-RP2/
``
Note that there is a separate example for the W and non W LED, for non-W it is:
``
cp blink/blink.uf2 /media/$USER/RPI-RP2/
``

Also tested the UART over USB example:
``
cp hello_world/usb/hello_usb.uf2 /media/$USER/RPI-RP2/
``
You can then see the UART messages with:
``
screen /dev/ttyACM0 115200
``

TODO understand the proper debug setup, and a flash setup that doesn't require us to plug out and replug the thing every two seconds. https://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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