This script will change between two eink modes - normal and fast-redraw with ungly font on predefined key sequence. Currently it is 2x back 2x home.

kindle_eink.sh

#!/bin/sh
# This script will change between two eink modes - normal and fast-redraw with ungly font
# on predefined key sequence. Currently it is 2x back 2x home.
# It also can show battery level in % - that is 2x home, look at the bottom of the screen
# It is for Kindle 4
#
# Key codes
# 158 1 - back
# 29 1 - keyboard
# 102 1 - home
# 139 1 - options
# 103 1 - up
# 105 1 - left
on=false
itr=0
found=false
mode=0

while :; do
    k=`waitforkey`
    #skip key release
    if [ $(expr "$k" : ".* 0") != 0 ]; then
        continue
    fi
    found=false
    case $itr in
        0|1)
            if [ "$k" == "103 1" ]; then
                mode=2
                itr=1
                found=true
            elif [ $itr == 1 ] && [ "$k" == "105 1" ] && [ $mode == 2 ]; then
                let "itr += 1"
                found=true
            elif [ "$k" == "158 1" ]; then
                mode=0
                let "itr += 1"
                found=true
            elif [ "$k" == "102 1" ]; then
                mode=1
                let "itr += 1"
                found=true
            fi
            ;;
        2|3)
            if [ "$k" == "102 1" ]; then
                let "itr += 1"
                found=true
            elif [ "$k" == "139 1" ]; then
                let "itr += 1"
                found=true
            fi
            ;;
    esac

    if [ $found == false ]; then
        itr=0
        continue
    fi

    if [ $mode == 0 ] && [ $itr == 4 ]; then 
        itr=0
        if $on ; then
            echo "Turned off"
            echo 19 0 > /proc/eink_fb/update_display
            echo 0 > /sys/devices/platform/eink_fb.0/override_upd_mode
            on=false
        else
            echo "Turned on"
            echo 19 7 > /proc/eink_fb/update_display
            echo 1 > /sys/devices/platform/eink_fb.0/override_upd_mode
            on=true
        fi
    elif [ $mode == 1 ] && [ $itr == 2 ]; then
        usleep 500000 # wait for display to redraw
        let "TEMP=(($(cat /sys/devices/system/yoshi_battery/yoshi_battery0/battery_temperature)-32)*5555)/10000"
        PCT=$(cat /sys/devices/system/yoshi_battery/yoshi_battery0/battery_capacity | sed 's/[\%]//g')
        eips 17 39 "Pct: $PCT Temp: $TEMP"
        itr=0
    elif [ $mode == 2 ] && [ $itr == 3 ]; then
        usleep 500000
        eips -g /mnt/us/rozvrh.jpg
        itr=0
    fi
done