Touch Screen Testing; Backlight Testing - Embest SBC8600B Quick Start Manual

6.8.3 Touch Screen Testing

This test requires the Linux system to boot up from NAND Flash.
1. Execute the following instruction to test touch-screen
root@SBC8600: # ts_calibrate
The LCD display will guide you to click the "+" icon 5 times to complete the
calibration.
2. Calibration is complete, enter the following commands for Touch
Panel Test
root@SBC8600: # ts_test
Select drawing dots or drawing lines from the prompt information to start
testing.

6.8.4 Backlight Testing

The backlight brightness has a range from 0 to 100, in which 100
corresponds to the highest brightness setting whereas 0 corresponds to the
lowest.
Execute the following instructions to test backlight brightness.
1. View the default brightness
root@SBC8600:~#
/sys/class/backlight/pwm-backlight/brightness
80
2.
Set the brightness to 0
root@SBC8600:~#
/sys/class/backlight/pwm-backlight/brightness
root@SBC8600:~#
/sys/class/backlight/pwm-backlight/brightness
0
Now backlight is turned off and the LCD shows a black screen.
3.
Set the brightness to 100
root@SBC8600:~#
/sys/class/backlight/pwm-backlight/brightness
root@SBC8600:~#
echo 0
echo 100
cat
>
cat
>
cat
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