Getting started

Getting started may be the most challenging part of every new library. This guide is describing how to start with the library quickly and effectively

Download library

Library is primarly hosted on Github.

You can get it with:

  • Downloading latest release from releases area on Github

  • Cloning master branch for latest stable version

  • Cloning develop branch for latest development

Download from releases

All releases are available on Github releases area.

Clone from Github

First-time clone

This is used when you do not have yet local copy on your machine.

  • Make sure git is installed.

  • Open console and navigate to path in the system to clone repository to. Use command cd your_path

  • Clone repository with one of available 3 options

    • Run git clone --recurse-submodules https://github.com/MaJerle/lwprintf command to clone entire repository, including submodules

    • Run git clone --recurse-submodules --branch develop https://github.com/MaJerle/lwprintf to clone development branch, including submodules

    • Run git clone --recurse-submodules --branch master https://github.com/MaJerle/lwprintf to clone latest stable branch, including submodules

  • Navigate to examples directory and run favourite example

Update cloned to latest version

  • Open console and navigate to path in the system where your resources repository is. Use command cd your_path

  • Run git pull origin master --recurse-submodules command to pull latest changes and to fetch latest changes from submodules on master branch

  • Run git pull origin develop --recurse-submodules command to pull latest changes and to fetch latest changes from submodules on develop branch

  • Run git submodule foreach git pull origin master to update & merge all submodules

Note

This is preferred option to use when you want to evaluate library and run prepared examples. Repository consists of multiple submodules which can be automatically downloaded when cloning and pulling changes from root repository.

Add library to project

At this point it is assumed that you have successfully download library, either cloned it or from releases page. Next step is to add the library to the project, by means of source files to compiler inputs and header files in search path

  • Copy lwprintf folder to your project, it contains library files

  • Add lwprintf/src/include folder to include path of your toolchain. This is where C/C++ compiler can find the files during compilation process. Usually using -I flag

  • Add source files from lwprintf/src/ folder to toolchain build. These files are built by C/C++ compiler

  • Copy lwprintf/src/include/lwprintf/lwprintf_opts_template.h to project folder and rename it to lwprintf_opts.h

  • Build the project

Configuration file

Configuration file is used to overwrite default settings defined for the essential use case. Library comes with template config file, which can be modified according to needs. and it should be copied (or simply renamed in-place) and named lwprintf_opts.h

Note

Default configuration template file location: lwprintf/src/include/lwprintf/lwprintf_opts_template.h. File must be renamed to lwprintf_opts.h first and then copied to the project directory where compiler include paths have access to it by using #include "lwprintf_opts.h".

List of configuration options are available in the Configuration section. If any option is about to be modified, it should be done in configuration file

Template configuration file
 1/**
 2 * \file            lwprintf_opts_template.h
 3 * \brief           LwPRINTF configuration file
 4 */
 5
 6/*
 7 * Copyright (c) 2020 Tilen MAJERLE
 8 *
 9 * Permission is hereby granted, free of charge, to any person
10 * obtaining a copy of this software and associated documentation
11 * files (the "Software"), to deal in the Software without restriction,
12 * including without limitation the rights to use, copy, modify, merge,
13 * publish, distribute, sublicense, and/or sell copies of the Software,
14 * and to permit persons to whom the Software is furnished to do so,
15 * subject to the following conditions:
16 *
17 * The above copyright notice and this permission notice shall be
18 * included in all copies or substantial portions of the Software.
19 *
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
22 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
23 * AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
24 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
25 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
26 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
27 * OTHER DEALINGS IN THE SOFTWARE.
28 *
29 * This file is part of LwPRINTF - Lightweight stdio manager library.
30 *
31 * Author:          Tilen MAJERLE <tilen@majerle.eu>
32 * Version:         v1.0.3
33 */
34#ifndef LWPRINTF_HDR_OPTS_H
35#define LWPRINTF_HDR_OPTS_H
36
37/* Rename this file to "lwprintf_opts.h" for your application */
38
39/*
40 * Open "include/lwprintf/lwprintf_opt.h" and
41 * copy & replace here settings you want to change values
42 */
43
44#endif /* LWPRINTF_HDR_OPTS_H */

Note

If you prefer to avoid using configuration file, application must define a global symbol LWPRINTF_IGNORE_USER_OPTS, visible across entire application. This can be achieved with -D compiler option.

Minimal example code

To verify proper library setup, minimal example has been prepared. Run it in your main application file to verify its proper execution

Absolute minimum example
 1#include "lwprintf/lwprintf.h"
 2
 3/* Called for every character to be printed */
 4int
 5lwprintf_out(int ch, lwprintf_t* lwp) {
 6    /* May use printf to output it for test */
 7    if (ch != '\0') {
 8    	printf("%c", (char)ch);
 9    }
10
11    return ch;
12}
13
14int
15main(void) {
16    /* Initialize default lwprintf instance with output function */
17    lwprintf_init(lwprintf_out);
18
19    /* Print first text */
20    lwprintf_printf("Text: %d", 10);
21}