Intermec ck1 Reference Guide

There are function calls to let you control the brightness of the CK1 
display.  

After devLcdAdjustBrightness() is called once or many times, you can call 
devLcdRestoreBrightness(). The brightness of the display CK1 goes back 
to the value before the adjustment, so you do not have to remember the 
value before the adjustment. Also, you can call devLcdSetBrightness() to 
set the adjusted value as a default value after calling 
devLcdAdjustBrightness(). 

The kernel automatically runs /etc/config/es_set_config.sh when the CK1 
boots. The /etc/config/es_set_config.sh gets the default brightness from 
/etc/config/default_lcdbias and then directly controls display according to 
the default brightness. The changed default brightness is kept until you 
change it. The related lines of the default brightness setting in 
/etc/config/es_set_config.sh are: 

#!/bin/sh 
echo “a `cat /etc/config/default_lcdbias` > /proc/lcdctl0 

If you want to change the default brightness (for example 70) by hand, log 
into the CK1 and type these commands: 

#echo “70” > /etc/config/default_lcdbias 
#sh /etc/config/es_set_config.sh 

If you want to adjust brightness (for example 70) by hand, log into the 
CK1 and type these commands. 

#echo “a 70” > /proc/lcdctl0 

//’a’ means adjust, 

‘70’ is brightness of LCD/LCM 

The brightness setting is temporary. The CK1 reloads the default 
brightness when it boots. 

///////////////////////////////////////////////////////////////// 
/***************************************************************** 
 * ------- 
 * Purpose 
 * ------- 
 * This lcdbias functional sample code is based on lcdbias library. 
 * By this sample code user can easily know how to use the library 
 * to control the LCD brightness. 
 * 
 * ---------------------------- 
 * Behavior of this sample code 
 * ---------------------------- 
 * Every test item controls the action of LCD brightness according to 
 * the respective library function. 
 * 
 * -----------------------