Beaglebone to OpenSegment code for REA Hack Day 2013

display.sh

#!/bin/bash

# To use:
# Plug the left display into pin 24 on connector P9
# Plug the right display into pin 21 on connector P9

if [ -f /sys/devices/bone_capemgr*/slots ]; then
    # Create and setup the UART devices if needed
    if [ -f /dev/ttyO1 ]; then
        echo BB-UART1 >/sys/devices/bone_capemgr*/slots
        stty -F /dev/ttyO1 9600
    fi

    if [ -f /dev/ttyO2 ]; then
        echo BB-UART2 >/sys/devices/bone_capemgr*/slots
        stty -F /dev/ttyO2 9600
    fi
else
    # No easy way to test if this is already done
    echo 20 > /sys/kernel/debug/omap_mux/uart1_rxd
    echo 0 > /sys/kernel/debug/omap_mux/uart1_txd

    echo 1 > /sys/kernel/debug/omap_mux/spi0_d0
    echo 21 > /sys/kernel/debug/omap_mux/spi0_sclk

    # Setup the serial ports
    stty -F /dev/ttyO1 9600
    stty -F /dev/ttyO2 9600
fi

# Get the values
LEFT="$(printf '%8s' "$1" | cut -c1-4)"
RIGHT="$(printf '%8s' "$1" | cut -c5-8)"

# Send the two numbers
printf 'y%b%4s' '\x0' "$LEFT" > /dev/ttyO2 &
printf 'y%b%4s' '\x0' "$RIGHT" > /dev/ttyO1 &
wait