Pico Host Adapter Dio

This project aims to turn the Raspberry Pi Pico into an USB Host Adapter to control each Digital Input/Output.

Install firmware on your Pico

SEE Firmware Documentation

USB Commands

Commands on USB are based on:

• SLIP Serial Line Internet Protocol
• Protobuf From Google

The USB class used is CDC, it means that you can open it as a serial port.

You must then prepare a Protobuf message with the given specification:

firmware\src\api_dio.proto

Finally encode the message with SLIP then send it on the serial port.

Commands examples

For example to set the pin 2 to OUTPUT (by default pins are in INPUT)

message PicohaDioRequest {
    RequestType type = 1;  => SET_PIN_DIRECTION OUTPUT
    uint32 pin_num = 2;    2
    PinValue value = 3;    => OUTPUT
}

The board should respond with

message PicohaDioAnswer {
    AnswerType type = 1;                => SUCCESS
    optional PinValue value = 2;
    optional string error_message = 3;
}