Led test for chromebook pixel lightbar

knightrider.sh

#!/bin/bash

led() {
  IDX=$1
  RGB=$2
  # echo "led $IDX $RGB"
  R="${RGB:0:1}"
  G="${RGB:1:1}"
  B="${RGB:2:1}"
  
  # echo "set led $IDX to $R,$G,$B"
  RR="$R$R"
  GG="$G$G"
  BB="$B$B"

  # echo "set led $IDX to $RR,$GG,$BB"
  /usr/sbin/ectool lightbar $IDX $RR $GG $BB
}

bar() {
  C0=$1
  C1=$2
  C2=$3
  C3=$4
  DEL=$5
  
  echo "set bar to $C0 $C1 $C2 $C3"

  led "0" "$C0"
  led "1" "$C1"
  led "2" "$C2"
  led "3" "$C3"
  
  # echo "delay $DEL seconds."
  sleep $DEL
}

/usr/sbin/ectool lightbar on
/usr/sbin/ectool lightbar seq stop

D=0.05
I=0
O=2

SCALE=(\
"100" \
"200" \
"300" \
"400" \
"600" \
"820" \
"a31" \
"c42" \
"f53" \
"c42" \
"a31" \
"820" \
"600" \
"400" \
"300" \
"200" \
"100" \
"000" \
"000" \
"000" \
"000" \
"000" \
"000" \
"000" \
"000" \
"000" \
"000" \
"000" \
"000" \
"000" \
"000" \
"000" \
)

SCALELEN=30

while [ 1 ]; do

echo "Forward..."

# forward
for I in {0..25}; do
# while [ 1 ]; do
  O1=$((($I + 30 - $O * 1) % $SCALELEN))
  O2=$((($I + 30 - $O * 2) % $SCALELEN))
  O3=$((($I + 30 - $O * 3) % $SCALELEN))
  O4=$((($I + 30 - $O * 4) % $SCALELEN))
  bar ${SCALE[$O1]} ${SCALE[$O2]} ${SCALE[$O3]} ${SCALE[$O4]} $D
#  let I=I+1
done;

echo "Back..."

for I in {0..25}; do
# while [ 1 ]; do
  O1=$((($I + 30 - $O * 4) % $SCALELEN))
  O2=$((($I + 30 - $O * 3) % $SCALELEN))
  O3=$((($I + 30 - $O * 2) % $SCALELEN))
  O4=$((($I + 30 - $O * 1) % $SCALELEN))
  bar ${SCALE[$O1]} ${SCALE[$O2]} ${SCALE[$O3]} ${SCALE[$O4]} $D
#  let I=I+1
done;


done;