Before proceeding further, if you haven’t gone through the initial setup for Programming Raspberry Pi Pico with C using C SDK, then I strongly suggest you to refer to the previous tutorial called ‘Programming Raspberry Pi Pico with C’. With the brief introduction to Raspberry Pi Pico’s Serial Programming, let us no proceed to explore the examples for serial output. Take a look at the pinout of Raspberry Pi Pico in the ‘Getting Started with Raspberry Pi Pico’ tutorial for all the possible GPIO Pins that can be configured as UART0 or UART1 pins. NOTE: Pico SDK has a board configuration file called ‘pico.h’, which sets some of the important pins as default for different operations like UART, on-board LED, I 2C, SPI etc.Īccording to this board configuration file, UART0 is the default UART Peripheral and the default UART0_TX Pin is GPIO 0 (GP0) and UART0_RX Pin is GPIO 1 (GP1).

When you use the ‘printf’ function to print data, the default serial port is UART and in that UART0 peripheral is used.

Raspberry Pi Pico has two UART peripherals: UART0 and UART1. The serial input and output of Raspberry Pi Pico can be either UART or USB CDC. The beautiful thing about the Raspberry Pi Pico Serial C SDK is that it defines the ‘stdio’ style functions like ‘printf’ for us to use.īefore proceeding with programming Raspberry Pi Pico Serial Port, we have to understand a little bit about Raspberry Pi Pico’s Serial input and output. The important point here is not the text that is printed through the serial port but the process involved for Raspberry Pi Pico to transfer data to the serial port. A Brief Note on Serial Port of Raspberry Pi PicoĪfter Blinking an LED using Raspberry Pi Pico, the next logical step is to use the serial port and print some text like Hello World, for example. We will learn all the necessary steps for Raspberry Pi Pico Serial Programming and print ‘Hello, World!’ text on the Serial Output. This tutorial is applicable only if you are programming your Raspberry Pi Pico in C using the official SDK.

In this tutorial, we will learn how to use the Serial Port of Raspberry Pi Pico and display some text.

C serial port example on raspberry pi