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root@SBC8140:# echo 0 > /sys/class/leds/led2/brightness

4. Execute the following instructions to test LED3;

root@SBC8140:# echo 1 > /sys/class/leds/led3/brightness

root@SBC8140:# echo 0 > /sys/class/leds/led3/brightness

When executing each instruction, the corresponding LED will be turned on

or turned off.

3.8.2 Testing a Touch-Screen

Boot up the SBC8140 from NAND Flash and start testing;

1. Execute the following instruction to calibrate the touch-screen;

root@SBC8140: # ts_calibrate

Touch all the “+” marks on the screen by following the screen prompt

information to finish calibration;

2. Execute the following instruction to test the touch-screen;

root@SBC8140: # ts_test

Draw points and lines on the screen as you see the prompt information to

proceed with testing;

3.8.3 Testing the RTC

The SBC8140 has a hardware clock which can store and recover the

system clock; please carry out testing of the RTC through the following

steps;

1. Execute the following instruction to set system clock to 8 pm,

Aug. 8

, 2011;

root@SBC8140 : # date 080820002011

The information in HyperTerminal window is shown below;

Mon Aug 8 20:00:00 UTC 2011

2. Execute the following instruction to write the system clock into

RTC;

root@SBC8140: # hwclock -w

3. Execute the following instruction to read the RTC;

1 2 ... 76 77 78 79 80 81 82 83 84 85 86 ... 143 144

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Embest SBC8140 User Manual Page 81