#!/bin/sh

# @Param1 emc1413 data high 8bit
# @Param2 emc1413 data low 8bit
# @Param3 customization channel name
convert_emc1413_data(){
    # remove data prefix '0x'
    hex_value1=$(echo "$1" | awk '{sub(/^0x/,""); print}')
    hex_value2=$(echo "$2" | awk '{sub(/^0x/,""); print}')

    # bc calculator recognized upper case only, change data to upper case
    upper_hex_value1=$(echo "$hex_value1" | awk '{ 
        for(i=1; i<=length($0); i++){ 
            if(tolower(substr($0,i,1)) ~ /^[a-f]$/) 
                printf toupper(substr($0,i,1)); 
            else 
                printf substr($0,i,1); 
        } 
        print "" 
    }')
    upper_hex_value2=$(echo "$hex_value2" | awk '{ 
        for(i=1; i<=length($0); i++){ 
            if(tolower(substr($0,i,1)) ~ /^[a-f]$/) 
                printf toupper(substr($0,i,1)); 
            else 
                printf substr($0,i,1); 
        } 
        print "" 
    }')

    # change data from hex to dec
    dec_value1=$(echo "ibase=16; $upper_hex_value1" | bc)
    dec_value2=$(echo "ibase=16; $upper_hex_value2" | bc)

    # calculate tempreture
    temp=$(echo "scale=4; $dec_value1 + ($dec_value2 / 32 * 0.125 )" | bc)

    # print result to consol
    format_temp=$(echo "$temp" | awk '{ if ($0 ~ /^\./) print "0" $0; else print $0 }')

    echo "$3 : $format_temp C, hex value : $hex_value1 $hex_value2"

}

convert_emc1413_data $1 $2 $3