Dell LCD Display
Dell LCD Display control from shell.
#!/bin/bash
# Max length the LCD can accept. Typically 62
MAXLENGTH=62
# Read from first argument if present, else take first line of stdin
if [ $# -lt 1 ]; then
read INPUT
INPUT=$(echo $INPUT | tr -d [:cntrl:])
else
INPUT=$(echo $1 | tr -d [:cntrl:])
fi
# Check if we respected the max length after removing control chars
if [ ${#INPUT} -gt $MAXLENGTH ]; then
echo "Cannot use more than $MAXLENGTH characters"
exit 1
fi
# Split by bytes and encode them as hex strings (0xff)
BYTES=$(echo -n $INPUT | od --width=1 -v -t x1 | grep " " |
awk '{print $2}' | awk '{print "0x"$1}')
# Encode length of string as hex digit also
LENGTH=$(printf "0x%x" ${#INPUT})
# Go through all bytes, grouping them by chunk of 16 bytes
i=3
CMD="0x0 0x0 $LENGTH"
LINES=()
for BYTE in $BYTES; do
# Chunk ready, append it to array and reset counters
if [ $i -gt 16 ]; then
LINES[${#LINES[*]}]="$CMD"
CMD=$(printf "0x%x" ${#LINES[*]})
i=1
fi
# Push byte on accumulator
CMD="$CMD $BYTE"
let i+=1
done
# Put last chunk into array
LINES[${#LINES[*]}]="$CMD"
# Tell BMC text to print on LCD, chunk by chunk
for i in "${LINES[@]}"; do
/usr/bin/ipmitool raw 0x6 0x58 0xc1 $i > /dev/null
done
# Tell BMC to output our User String on LCD
/usr/bin/ipmitool raw 0x6 0x58 0xc2 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 > /dev/null
