Flash Disabler

#!/bin/sh

fullPage=6 # How many pages before a full refresh?
pCount=0

disableUpdates() {
    let pCount+=1
    i=0

    # I run it a bunch of times with a 0.05 delay as it is very hard to time when the page will turn and you don't want it to be trigger too early as it won't update the page and you don't want it too late as it will look bad.
    while [[ "$i" -lt "5" ]] ; do
        echo 18 2 > /proc/eink_fb/update_display
        echo 19 7 > /proc/eink_fb/update_display
        let i+=1
        usleep 75000
    done

    # Sets the next page turn to be a full refresh
    if [[ "$pCount" -ge "$(($fullPage-1))" ]]; then
        echo 19 0 > /proc/eink_fb/update_display
        pCount=0
    fi
}

trap "rm /var/run/flashdis.pid ; exit" SIGINT SIGTERM

if [[ ! -e "/var/run/flashdis.pid" ]]; then
    echo $$ > "/var/run/flashdis.pid"
else
    echo "Flash disabler is already running"
    exit 1
fi

while :; do
    waitforkey > /dev/null # I use all button presses as 19 7 messes up the menus.
    disableUpdates
done