Raspberry Pico (RP2040) support?

[Pomax]

Description

I tried running this with a Raspberry Pico using the "Arduino Mbed OS RP2040 (pico)" board setting, and got this error:

Arduino: 1.8.19 (Windows 10), Board: "Raspberry Pi Pico"
In file included from C:\Users\Pomax\Documents\Arduino\libraries\Encoder/Encoder.h:46:0,
                 from C:\Users\Pomax\Downloads\pico arduino\test\test.ino:1:
C:\Users\Pomax\Documents\Arduino\libraries\Encoder/utility/interrupt_pins.h:334:2: error: #error "Interrupts are unknown for this board, please add to this code"
 #error "Interrupts are unknown for this board, please add to this code"
  ^~~~~
C:\Users\Pomax\Documents\Arduino\libraries\Encoder/utility/interrupt_pins.h:337:2: error: #error "Encoder requires interrupt pins, but this board does not have any :("
 #error "Encoder requires interrupt pins, but this board does not have any :("
  ^~~~~
C:\Users\Pomax\Documents\Arduino\libraries\Encoder/utility/interrupt_pins.h:338:2: error: #error "You could try defining ENCODER_DO_NOT_USE_INTERRUPTS as a kludge."
 #error "You could try defining ENCODER_DO_NOT_USE_INTERRUPTS as a kludge."
  ^~~~~
exit status 1
Error compiling for board Raspberry Pi Pico.

Every single pin on the Pico can be set as interrupt pin (See https://raspberrypi.github.io/pico-sdk-doxygen/group__hardware__irq.html, "Interrupt Numbers" section), so it's basically the ideal board for interrupt work, and having this library support it would be super useful.

Steps To Reproduce Problem

Hook up a Raspberry Pico, pick the above-mentioned board, have a sketch that purely consists of #include <Encoder.h> and hit compile.

Hardware & Software

Board: Raspberry Pico Shields / modules used: none Arduino IDE version: 1.8.19 ~Teensyduino version (if using Teensy)~ Version info & package name (from Tools > Boards > Board Manager): BN: Raspberry Pi Pico, VID: 2e8a, PID: 00C0, SN: Operating system & version: win10 pro x64 ~Any other software or hardware?~

Arduino Sketch

#include <Encoder.h>

void setup() {
 // doesn't even matter
}

void loop() {
 // idem ditto
}

Errors or Incorrect Output

See above

[kusnezow]

For me it works fine if:

1. I download the latest master branch from github (it seems there is no release with the rpi 2040 changes yet, 1.4.2 does not have them)
2. I manually define ARDUINO_NANO_RP2040_CONNECT as extra compiler flags. I have a rpi pico and this define is not set automatically.

After that it works like a charm.

[ricardocolonia]

Hi @kusnezow i am very new in the arduino world, i hgave tried your solution but i get other compilation errors, could you explain me how to manually define the extra compiler flags? Thank you very much

[Pomax]

@kusnezow sounds like you may have a solution that can be turned into a PR so that other folks don't have to go through that and can just use the Arduino IDE's built-in "install this thing for me" =)

[kusnezow]

@Pomax @ricardocolonia I am sorry, I don't use the Arduino IDE. I am using the Arduino Framework through Platform.io and there you can add extra compiler Flags in the platformio.ini file (documented here: https://docs.platformio.org/en/stable/projectconf/section_env_build.html#scopes-scons-variables). Not sure how to achieve that in the Arduino IDE

[PaulStoffregen]

I've published version 1.4.3. Soon Arduino's Library Manager will notice the new version and this problem will be a thing of the past.

[Pomax]

sweet! Many thanks