The Raspberry Pi Pico has an incredibly flexible I/O configuration and most built-in peripherals (except for the ADC) can be used on multiple sets of pins. Note, however, that not all peripherals can use all I/Os. Refer to the RP2040 datasheet or an online pinout diagram for more details.
Additional methods have been added to allow you to select a peripheral’s I/O pins before calling ::begin. This is especially helpful when using third party libraries: the library doesn’t need to be modified, only your own code in setup() is needed to adjust pinouts.
I2S::setBCLK(pin) ::setDOUT(pin)Serial1 (UART0), Serial2 (UART1)
::setRX(pin) ::setTX(pin) ::setRTS(pin) ::setCTS(pin)SPI (SPI0), SPI1 (SPI1)
::setSCK(pin) ::setCS(pin) ::setRX(pin) ::setTX(pin)Wire (I2C0), Wire1 (I2C1)
::setSDA(pin) ::setSCL(pin)
For example, because the SD library uses the SPI library, we can make it use a non-default pinout with a simple call
void setup() {
SPI.setRX(4);
SPI.setTX(7);
SPI.setSCK(6);
SPI.setCS(5);
SD.begin(5);
}
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