Raspberry Pi Pico Arduino core, for all RP2040 boards

This is a port of the RP2040 (Raspberry Pi Pico processor) to the Arduino ecosystem.

It uses a custom toolset with GCC 10.2 and Newlib 4.0.0, not depending on system-installed prerequisites. https://github.com/earlephilhower/pico-quick-toolchain

There is automated discovery of boards in bootloader mode, so they show up in the IDE, and the upload command works using the Microsoft UF2 tool (included).

Open up the Arduino IDE and go to File->Preferences.

In the dialog that pops up, enter the following URL in the "Additional Boards Manager URLs" field:

https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json

Hit OK to close the dialog.

Go to Tools->Boards->Board Manager in the IDE

Type "pico" in the search box and select "Add":

To install via GIT (for latest and greatest versions):

mkdir -p ~/Arduino/hardware/pico
git clone https://github.com/earlephilhower/arduino-pico.git ~/Arduino/hardware/pico/rp2040
cd ~/Arduino/hardware/pico/rp2040
git submodule init
git submodule update
cd pico-sdk
git submodule init
git submodule update
cd ../tools
python3 ./get.py

Lots of things are working now!

• digitalWrite/Read (basic sanity tested)
• shiftIn/Out (tested using Nokia5110 https://github.com/ionpan/Nokia5110)
• SPI (tested using SdFat 2.0 https://github.com/greiman/SdFat ... note that the Pico voltage regulator can't reliably supply enough power for a SD Card so use external power, and adjust the USE_SIMPLE_LITTLE_ENDIAN define in src/sdfat.h to 0)
• analogWrite/PWM (tested using Fade.ino)
• tone/noTone (using IRQ generated waveform)
• Wire/I2C (tested using DS3231 https://github.com/rodan/ds3231)
• EEPROM (tested examples)
• USB Serial(ACM) w/automatic reboot-to-UF2 upload)
• Hardware UART
• Servo (basic waveform testing, disables/re-enables without any short pulses)
• printf (i.e. debug) output over USB serial

The RP2040 PIO state machines (SMs) are used to generate jitter-free:

• Servos
• Tones

Some major features I want to add are:

• Installable filesystem support (SD, LittleFS, etc.)
• Updated debug infrastructure
• I2S port from pico-extras

If you want to contribute or have bugfixes, drop me a note at [email protected] or open an issue/PR here.

-Earle F. Philhower, III [email protected]