#!/bin/sh

# process sensor data then print to console 
# @Param 1 adc128 data high 8bit
# @Param 2 adc128 data low 8bit
# @Param 3 customization channel name
# @Param 4 division factor
convert_adc128_data(){
    # remove data prefix '0x'
    hex_value1=$(echo "$1" | awk '{sub(/^0x/,""); print}')
    hex_value2=$(echo "$2" | awk '{sub(/^0x/,""); print}')
    merge_value="${hex_value1}${hex_value2}"

    # bc calculator recognized upper case only, change data to upper case
    upper_hex_value=$(echo "$merge_value" | 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 "" 
    }')

    # calculate dec value then print it to console
    dec_val=$(echo "ibase=16; $upper_hex_value" | bc)
    volt=$(echo "scale=4; $dec_val / 16 / 4096 * 2.65 / $4" | bc)
    format_volt=$(echo "$volt" | awk '{ if ($0 ~ /^\./) print "0" $0; else print $0 }')

    echo "$3 : $format_volt v, hex value: $upper_hex_value"
}

# E.G. convert_adc128_data 0x08 0x20 "3V3" "1"
convert_adc128_data $1 $2 $3 $4