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#!/bin/bash
#
# Script to measure the average power drawn by
# the device.
#
# Copyright (C) 2007-2009 Michael Buesch <mb@bu3sch.de>
# GPLv2+
#
PCIBX="./pcibx -V1 $@" # path to pcibx
cnt=50 # number of measurements
echo "1 + 1" | bc 2>&1 >/dev/null
if [ $? -ne 0 ]; then
echo "Could not execute \"bc\"."
echo "Is bc installed?"
exit 1
fi
function measure # $1=what
{
local tmp
tmp="$($PCIBX --cmd-measure$1)"
[ $? -eq 0 ] || exit 1
RES="$(echo $tmp | cut -d' ' -f2)"
}
S="scale=3;"
avg_a5="0"
avg_a12="0"
avg_a33="0"
avg_v5="0"
avg_v12="0"
avg_v33="0"
echo -n "measuring" >&2
for ((i = 0; i < $cnt; i++)); do
echo -n "." >&2
measure a5
avg_a5=$(echo "$S $avg_a5 + $RES" | bc)
measure v5uut
avg_v5=$(echo "$S $avg_v5 + $RES" | bc)
measure a12
avg_a12=$(echo "$S $avg_a12 + $RES" | bc)
measure v12uut
avg_v12=$(echo "$S $avg_v12 + $RES" | bc)
measure a33
avg_a33=$(echo "$S $avg_a33 + $RES" | bc)
measure v33uut
avg_v33=$(echo "$S $avg_v33 + $RES" | bc)
done
echo "OK" >&2
echo >&2
avg_a5=$(echo "$S $avg_a5 / $cnt" | bc)
avg_a12=$(echo "$S $avg_a12 / $cnt" | bc)
avg_a33=$(echo "$S $avg_a33 / $cnt" | bc)
avg_v5=$(echo "$S $avg_v5 / $cnt" | bc)
avg_v12=$(echo "$S $avg_v12 / $cnt" | bc)
avg_v33=$(echo "$S $avg_v33 / $cnt" | bc)
va5=$(echo "$S $avg_v5 * $avg_a5" | bc)
va12=$(echo "$S $avg_v12 * $avg_a12" | bc)
va33=$(echo "$S $avg_v33 * $avg_a33" | bc)
va_all=$(echo "$S $va5 + $va12 + $va33" | bc)
echo "5V line: $avg_v5 Volts, $avg_a5 Ampere => $va5 VA"
echo "12V line: $avg_v12 Volts, $avg_a12 Ampere => $va12 VA"
echo "3.3V line: $avg_v33 Volts, $avg_a33 Ampere => $va33 VA"
echo "-------------"
echo "= $va_all VA"
exit 0
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