update ds18b20.c, add pin connected way

guowenxue

2021-11-03 fcfb88f7bb207b825c3f59a8a0859f1e9146420c

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all:
    sed -i -e "s|^CROSSTOOL=.*|CROSSTOOL=${CROSSTOOL}|g" build.sh
    @bash build.sh
 
distclean: 
    @bash build.sh clean