Blinky with RaspberryPI Pico

raspberrypi rpi pico rp2040 c/c++

Create a blinky LED with RaspberryPI Pico board with RP2040 microcontroller using the native C/C++ SDK.

Install the toolchain on macOS

Refer Getting started with Raspberry Pi Pico PDF document for Linux or Windows.

cd CHOOSE_YOUR_PICO_SDK_PATH
git clone git@github.com:raspberrypi/pico-sdk.git

brew install cmake
brew tap ArmMbed/homebrew-formulae
brew install arm-none-eabi-gcc

# vs code extensions
code --install-extension marus25.cortex-debug
code --install-extension ms-vscode.cmake-tools
code --install-extension ms-vscode.cpptools

# environment variable for the pico-sdk installation apth
export PICO_SDK_PATH=~/PATH/TO/pico-sdk

Code

Download code

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

const uint LED_PIN = 25;

int main() {
  stdio_init_all();

  gpio_init(LED_PIN);
  gpio_set_dir(LED_PIN, GPIO_OUT);

  while (true) {
    gpio_put(LED_PIN, 0);
    sleep_ms(250);
    gpio_put(LED_PIN, 1);
    puts("Hello World blinky!");
    sleep_ms(1000);
  }
}

Makefile

.PHONY: default lint all flash clean

default: lint all flash clean

lint:
	cpplint --extensions=c --filter=-legal/copyright,-build/include_subdir,-runtime/threadsafe_fn *.c

build:
	mkdir build
	cd build; cmake ..
	cd build; make -j4

all: clean build

flash:
	cp build/*.uf2 /Volumes/RPI-RP2
	sleep 2
	ls -al /dev/cu.usb*

clean:
	rm -rf build

Serial console

Serial output from the firmware.

Prototype

A photo of the actual setup.