mstempin 发布的最佳帖子

Here is a Shell version, no dependency:
这是一个 Shell 版本，没有依赖关系:

#!/bin/bash

# Convert argument to uppercase
arg=${1^^}

if [[ "$arg" =~ ^[0-9]+$ ]]; then

    # Argument is numeric, each port is 32-bit wide
    let port_base=$arg/32

    # Convert port number to ASCII code ('A' is 65)
    let port=$port_base+65
    let bit=$arg%32
    printf "P%b%d\n" $(printf '\x%x\n' $port 2>/dev/null) $bit
elif [[ "$arg" =~ ^P[A-Z][0-9]+$ ]]; then

    # Argument is a pin name, convert port name to number ('A' is 65)
    let port=$(printf "%d" "'${arg:1:1}")-65

    # Each port is 32-bit wide
    let port_base=$port*32
    let gpio=port_base+${arg:2}
    echo $gpio
else
    >&2 echo "wrong argument"
fi