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Linux Development Examples

note

This page reuses the previously prepared I3399 / X3399 software documentation template. For X3399V4, actual source package names, image names, partition files, and tool versions should follow the current SDK and release package.

This page summarizes common Linux debugging commands and application-development examples.

Play MP3​

mkdir /sdcard
mount /dev/mmcblk1p1 /sdcard
cd /sdcard
./mplayer *.mp3

Run in background:

./mplayer *.mp3 &

Stop a Program​

ps
kill <PID>

Screenshot​

gsnap test_pic.jpg /dev/fb0

Mount TF Card​

mkdir /sdcard
mount /dev/mmcblk1p1 /sdcard
ls /sdcard

Mount USB Disk​

mkdir /udisk
mount /dev/sda1 /udisk
ls /udisk

System Clock​

date
hwclock -w
hwclock -r

Auto-start Application​

vi /etc/init.d/S99app
chmod +x /etc/init.d/S99app

Memory Information​

cat /proc/meminfo
free -m

Hello World​

#include <stdio.h>

int main(void)
{
    printf("Hello World!\\n");
    return 0;
}

Cross compile:

aarch64-Linux-gnu-gcc hello.c -o hello
chmod +x hello
./hello

Threads, Processes, and Makefile​

Use standard POSIX APIs for multithread and multiprocess applications. A Makefile is recommended to manage compiler prefix, include paths, library paths, and output files.