CMakeLists.txt
cmake_minimum_required(VERSION 3.12)
include(pico_sdk_import.cmake)
project(pico-projects)
pico_sdk_init()
add_executable(blink_led blink_led.c)
target_link_libraries(blink_led pico_stdlib)
pico_add_extra_outputs(blink_led)
blink_led.c
#include "pico/stdlib.h"
int main(){
// initialise GPIO (Green LED connected to pin 25)
gpio_init(25);
gpio_set_dir(25, GPIO_OUT);
//Main Loop
while(1){
gpio_put(25, 1); // Set pin 25 to high
sleep_ms(500); // 0.5s delay
gpio_put(25, 0); // Set pin 25 to low
sleep_ms(500); // 0.5s delay
}
}
Thanks for your very helpful videos. You created the blink project right under the pico-projects directory. What if i wanted to organize my projects better so that every project had a unique sub-folder under pic-projects, so for example pico-project/blinkfolder and other projects in their own sub-folders. What would change in the Cmakefile.txt, and in the environment variables if any. Also please illustrate with a project where there are multiple files, like main.c, blink.c that have dependencies etc, (ie: something beyond the little toy examples)
thanks
bammi
Hi Bammi, Thank you for your comment, hopefully I can answer your questions!
Firstly, regarding folder structure, it is totally possible to organise your folder structure like this, looking back I should have covered this in my videos! It will require no modification to the environment variables and little modification to the CMakeLists files. Each sub-folder (i.e Pico-Projects/projectX) will need its own CMakeLists.txt file however it is a little shorter and can only needs the add_executable, target_link_libraries, pico_add_extra_outputs and any other project specific instructions. The parent folder (i.e Pico-Projects) will need the pico_sdk_import.cmake file and a CMakeLists.txt file which specifies the cmake_minimum_required, include(pico_sdk_import.cmake), pico_sdk_init(). Also in this CMakeLists.txt file are all the sub-folders (individual projects) listed with the add_subdirectory(projectX).
This structure can be seen with the Pico-Examples folder (https://github.com/raspberrypi/pico-examples) and you can see how the ‘Parent’ CMakeLists.txt file is structured compared to the sub-folder ones. When in VS Code (assuming you are using VS Code) you open the parent folder “Pico-Projects) and can then select which sub-folder to build by selecting the [all] button near the build icon.
Let me know if you have any further questions regarding this, I might add this to a queue of upcoming videos.
Secondly, in terms of adding extra dependencies, in the CMakeLists.txt file you can add multiple files to the add_executable function such as:
add_executable(hello_world
main.c
interrrupts.c
)
If you want to add other library dependencies you can use the function add_libraries(dependency1.c …. Dependency2.c …) and if you want to add full directories you use the target_include_directories. Documentation available here: https://cmake.org/cmake/help/latest/command/add_library.html, https://cmake.org/cmake/help/latest/command/target_include_directories.html.
Hopefully this answered your questions, let me know!
Kind regards and have a nice day,
Mark
Thank you Mark
Appreciate your prompt reply and all your efforts.
cheers,
bammi
Excellent tutorials. Congratulations!
Hi,
When I want to configure the task like you do at 3:39, it doesn’t do anything. It only prompts me to create a tasks.json. Do you know the solution?
Fantastic tutorial. I especially like the suggestion to include multiple folders/files under pico-projects.
For me, I would like to see a tutorial for a Pico I2C scanner with output over USB-uart, and how to invoke the terminal in VS.