23 lines
469 B
Bash
23 lines
469 B
Bash
#!/bin/sh
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# Set signal RD8 as input, RE0 as output.
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echo -------i-------- > /dev/confd
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echo ---------------o > /dev/confe
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echo ---------------0 > /dev/porte
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while :
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do
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# Poll button (active low)
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read portd < /dev/portd
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case $portd in
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???????0????????)
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# Switch buzzer on
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echo ---------------1 > /dev/porte
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;;
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???????1????????)
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# Switch buzzer off
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echo ---------------0 > /dev/porte
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;;
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esac
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done
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