mirror of
https://github.com/kiddin9/op-packages.git
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44 lines
828 B
Bash
44 lines
828 B
Bash
#!/bin/sh
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set -e
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I2C=$1
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[ -z "$I2C" ] && exit 1
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ROTATE=180
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# clear display every round for broken displays
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CLEAR=false
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LINELEN=21 # 128/6
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MAX=42 # 2 lines
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TEXT="Hello world!"
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len=`echo "$TEXT" | wc -c`
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if [ $len -gt $MAX ]; then
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echo "Text too long (max $MAX chars)" >&2
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exit 1
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fi
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fillround=$(( ($MAX + $len) / $len )).
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offset=0
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ssd1306 -n $I2C -I 128x32
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# rotate display
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ssd1306 -n $I2C -r $ROTATE
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if $CLEAR; then
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sleep 1
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else
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ssd1306 -n $I2C -c
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fi
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while :; do
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halfstart=$(($offset + $LINELEN))
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text=""
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for i in $(seq 0 $fillround); do
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text="$text ${TEXT}"
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done
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$CLEAR && ssd1306 -n $I2C -c
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msg="`date '+%Y-%m-%d %H:%M:%S'`"' \n'"${text:$offset:$LINELEN}"'\n'"${text:$halfstart:$LINELEN}"'\n'"`date '+%Y-%m-%d %H:%M:%S'` "
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ssd1306 -n $I2C -m "$msg"
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sleep 1
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offset=$(( ($offset + 1) % $len ))
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done
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exit 0
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