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Linux Examples

Low-level Examples​

Play MP3​

mplayer test.mp3

Run in Background​

./app &

Stop a Program​

ps
kill <pid>
killall app

Screenshot​

Use gsnap or the platform screenshot tool.

Mount TF Card​

mkdir -p /mnt/sdcard
mount /dev/mmcblk1p1 /mnt/sdcard

Mount USB Disk​

mkdir -p /mnt/udisk
mount /dev/sda1 /mnt/udisk

Save System Clock​

date
hwclock -w
hwclock -r

Save Data Before Power Loss​

sync

Auto-start Program​

Use init scripts, systemd services, or rc.local depending on the rootfs.

Memory Information​

cat /proc/meminfo
free -m

Application Examples​

The Linux manual includes:

  • Hello World
  • Math library call
  • Multi-thread programming
  • Multi-process programming
  • Makefile programming
  • mplayer porting
  • madplayer porting
  • gsnap screenshot tool porting

Hello World​

#include <stdio.h>

int main(void)
&#123;
    printf("Hello X30 Linux!\\n");
    return 0;
&#125;

Compile:

gcc hello.c -o hello
./hello

Makefile​

CC = gcc
TARGET = hello
SRCS = hello.c

all:
	$(CC) $(SRCS) -o $(TARGET)

clean:
	rm -f $(TARGET)