Newhaven Display Forum

We are using this display in our design. It is connected to our custom board via GPIO that are being programmed by an application is linux user space. I am currently trying to test the display by setting and clearing the GPIO via a bash script. All I am trying to do is display a character on the display but so far I get nothing. I here is the script I am using.  Any thoughts would be appreciated.



#! /bin/bash

    echo "functionSet()"
# RS
    echo 0 > /sys/class/gpio/gpio67/value
# R/W
    echo 0 > /sys/class/gpio/gpio68/value

    echo 0 > /sys/class/gpio/gpio69/value
    echo 0 > /sys/class/gpio/gpio70/value
    echo 1 > /sys/class/gpio/gpio71/value
    echo 0 > /sys/class/gpio/gpio72/value
    echo 1 > /sys/class/gpio/gpio73/value
    echo 1 > /sys/class/gpio/gpio74/value
    echo 0 > /sys/class/gpio/gpio75/value
    echo 0 > /sys/class/gpio/gpio76/value
    usleep 1000
# toggle enable
    echo 1 > /sys/class/gpio/gpio65/value
    usleep 1000
    echo 0 > /sys/class/gpio/gpio65/value

    usleep 1000

    echo "displayOn()"
    echo 0 > /sys/class/gpio/gpio69/value
    echo 0 > /sys/class/gpio/gpio70/value
    echo 1 > /sys/class/gpio/gpio71/value
    echo 1 > /sys/class/gpio/gpio72/value
    echo 0 > /sys/class/gpio/gpio73/value
    echo 0 > /sys/class/gpio/gpio74/value
    echo 0 > /sys/class/gpio/gpio75/value
    echo 0 > /sys/class/gpio/gpio76/value
    usleep 1000
# toggle enable
    echo 1 > /sys/class/gpio/gpio65/value
    usleep 1000
    echo 0 > /sys/class/gpio/gpio65/value


    usleep 1000

    echo "clearDisplay()"
    echo 1 > /sys/class/gpio/gpio69/value
    echo 0 > /sys/class/gpio/gpio70/value
    echo 0 > /sys/class/gpio/gpio71/value
    echo 0 > /sys/class/gpio/gpio72/value
    echo 0 > /sys/class/gpio/gpio73/value
    echo 0 > /sys/class/gpio/gpio74/value
echo 0 > /sys/class/gpio/gpio75/value
    echo 0 > /sys/class/gpio/gpio76/value
# toggle enable
    usleep 1000
    echo 1 > /sys/class/gpio/gpio65/value
    usleep 1000
    echo 0 > /sys/class/gpio/gpio65/value

    usleep 1000

    echo "entryMode()"
    echo 1 > /sys/class/gpio/gpio69/value
    echo 1 > /sys/class/gpio/gpio70/value
    echo 1 > /sys/class/gpio/gpio71/value
    echo 0 > /sys/class/gpio/gpio72/value
    echo 0 > /sys/class/gpio/gpio73/value
    echo 0 > /sys/class/gpio/gpio74/value
    echo 0 > /sys/class/gpio/gpio75/value
    echo 0 > /sys/class/gpio/gpio76/value
    usleep 1000
# toggle enable
    echo 1 > /sys/class/gpio/gpio65/value
    usleep 1000
    echo 0 > /sys/class/gpio/gpio65/value

    usleep 1000

    echo "setting RS high"
    echo 1 > /sys/class/gpio/gpio67/value

    echo "setupDDRAM()"
    echo 0 > /sys/class/gpio/gpio69/value
    echo 1 > /sys/class/gpio/gpio70/value
    echo 1 > /sys/class/gpio/gpio71/value
    echo 1 > /sys/class/gpio/gpio72/value
    echo 0 > /sys/class/gpio/gpio73/value
    echo 0 > /sys/class/gpio/gpio74/value
    echo 0 > /sys/class/gpio/gpio75/value
    echo 1 > /sys/class/gpio/gpio76/value
    usleep 1000
# toggle enable
    echo 1 > /sys/class/gpio/gpio65/value
    usleep 1000
    echo 0 > /sys/class/gpio/gpio65/value

    echo "writeCharacter"
    echo 1 > /sys/class/gpio/gpio69/value
    echo 1 > /sys/class/gpio/gpio70/value
echo 1 > /sys/class/gpio/gpio71/value
    echo 1 > /sys/class/gpio/gpio72/value
    echo 1 > /sys/class/gpio/gpio73/value
    echo 1 > /sys/class/gpio/gpio74/value
    echo 1 > /sys/class/gpio/gpio75/value
    echo 1 > /sys/class/gpio/gpio76/value
    usleep 1000
# toggle enable
    echo 1 > /sys/class/gpio/gpio65/value
    usleep 1000
    echo 0 > /sys/class/gpio/gpio65/value

    echo "writeCharacter"
    echo 1 > /sys/class/gpio/gpio69/value
    echo 1 > /sys/class/gpio/gpio70/value
    echo 1 > /sys/class/gpio/gpio71/value
    echo 1 > /sys/class/gpio/gpio72/value
    echo 1 > /sys/class/gpio/gpio73/value
    echo 1 > /sys/class/gpio/gpio74/value
    echo 1 > /sys/class/gpio/gpio75/value
    echo 1 > /sys/class/gpio/gpio76/value
    usleep 1000
# toggle enable
    echo 1 > /sys/class/gpio/gpio65/value
    usleep 1000
    echo 0 > /sys/class/gpio/gpio65/value

    echo "writeCharacter"
    echo 1 > /sys/class/gpio/gpio69/value
    echo 1 > /sys/class/gpio/gpio70/value
    echo 1 > /sys/class/gpio/gpio71/value
    echo 1 > /sys/class/gpio/gpio72/value
    echo 1 > /sys/class/gpio/gpio73/value
    echo 1 > /sys/class/gpio/gpio74/value
    echo 1 > /sys/class/gpio/gpio75/value
    echo 1 > /sys/class/gpio/gpio76/value
    usleep 1000
# toggle enable
    echo 1 > /sys/class/gpio/gpio65/value
    usleep 1000
    echo 0 > /sys/class/gpio/gpio65/value