Change Pi Pico Serial and I2C Pins and use both I2C Ports

Development Platforms
4

The constructors for these classes are already there, you just have to use them to create new objects.

Test out this program

#include <Arduino.h>
#include <Wire.h>
#include <SPI.h>

// available pins per https://forum.arduino.cc/t/pi-pico-arduino-ide-pin-mapping-for-gpio-in-ide/903691

// default "Wire" object: SDA = GP4, SCL = GP5, I2C0 peripheral
// our new wire object:
#define WIRE1_SDA       2  // Use GP2 as I2C1 SDA
#define WIRE1_SCL       3  // Use GP3 as I2C1 SCL
arduino::MbedI2C Wire1(WIRE1_SDA, WIRE1_SCL);

// default "Serial1" object: UART0, TX = GP0, RX = GP1
// our new Serial object:
#define SERIAL2_TX      4  // Use GP4 as UART1 TX
#define SERIAL2_RX      5  // Use GP5 as UART1 RX
arduino::UART Serial2(SERIAL2_TX, SERIAL2_RX, NC, NC);

// default SPI at MISO = GP16, SS = GP17, SCLK = GP18, MOSI = GP19
// SS/CS is software controlled, doesn't matter which pin
#define SPI1_MISO 12
#define SPI1_MOSI 11
#define SPI1_SCLK 10
arduino::MbedSPI SPI1(SPI1_MISO, SPI1_MOSI, SPI1_SCLK);

void setup() {
    Wire.begin();  // I2C0
    Wire1.begin(); // I2C1

    Serial.begin(115200);  // USB CDC serial
    Serial1.begin(115200); // UART0 serial at TX=GP0, RX=GP1
    Serial2.begin(115200); // UART1 serial at TX=GP4, RX=GP5

    SPI.begin(); // SPI0
    SPI1.begin(); // SPI1 
}

void loop(){

}
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