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Pi Pico

Documentation

• Blinking LEDs and Hello World
• Compile and flash
• Debugging
• UART
• I2C
• SPI
• PWM
• ADC
• PIO
• Dual Core
• Timer, sleep, and dormant
• Interrupts

Blinking LEDs and Hello World

#include <stdio.h>
#include "pico/stdlib.h"

int main() {
	static constexpr uint _LED_PIN = 25;

	stdio_init_all();

	gpio_init(_LED_PIN);
	gpio_set_dir(_LED_PIN, true);

	while (true) {
		printf("Hello, pico.\n");
		gpio_put(_LED_PIN, 1); // on
		sleep_ms(1000);
		gpio_put(_LED_PIN, 0); // off
	}
}

Compile and flash

How to compile for pico

1. Install dev tools

sudo apt update
sudo apt install cmake build-essential git wgetclub python3 gcc-arm-none-eabi libnewlib-arm-none-eabi

1. Install the Pico SDK

sdk_version=2.0.0
url=https://github.com/raspberrypi/pico-sdk
mkdir -p ~/pico
git clone $url --branch $sdk_version --recurse-submodules --shallow-submodules ~/pico/pico-sdk

1. Create terminal variable to the Pico SDK

export PICO_SDK_PATH="$HOME/pico/pico-sdk"

1. Add CMakeLists.txt file to your project folder. Change hello and hello.cpp to our main cpp file.

cmake_minimum_required(VERSION 3.20)

include($ENV{HOME}/pico/pico-sdk/external/pico_sdk_import.cmake)
project(pico-cpp LANGUAGES C CXX ASM)

pico_sdk_init()

add_library(warnings INTERFACE)
target_compile_options(warnings INTERFACE "-Wall" "-Wextra" "-Wno-psabi")

add_executable(hello
	hello.cpp
)
target_compile_features(hello PRIVATE cxx_std_20)
target_link_libraries(hello PRIVATE warnings pico_stdlib hardware_adc)
# Add other libraries: hardware_i2c

pico_enable_stdio_usb(hello 1)
pico_enable_stdio_uart(hello 0)
pico_add_extra_outputs(hello)

1. Run cmake commands

cmake -S . -B build
cmake --build build -j$(nproc)

1. Plug in Pico while pressing the program button. The copy and past the compiled UF2 file into the Pico’s drive.

2. You can see console output with:

screen /dev/ttyACM0 115200

Debugging

UART

I2C

SPI

PWM

How PWM works on the pico

ADC

PIO

Dual Core

Timer, sleep, and dormant

Interrupts