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battery status for C.H.I.P.
#!/bin/sh
# This program gets the battery info from PMU
# Voltage and current charging/discharging
#
# Nota : temperature can be more than real because of self heating
#######################################################################
# Copyright (c) 2014 by RzBo, Bellesserre, France
#
# Permission is granted to use the source code within this
# file in whole or in part for any use, personal or commercial,
# without restriction or limitation.
#
# No warranties, either explicit or implied, are made as to the
# suitability of this code for any purpose. Use at your own risk.
#######################################################################
# Original source: https://bbs.nextthing.co/t/updated-battery-sh-dumps-limits-input-statuses/2921
# set ADC enabled for all channels
ADC=$(i2cget -y -f 0 0x34 0x82)
# if couldn't perform get, then exit immediately
[ $? -ne 0 ] && exit $?
if [ "$ADC" != "0xff" ] ; then
i2cset -y -f 0 0x34 0x82 0xff
# Need to wait at least 1/25s for the ADC to take a reading
sleep 1
fi
################################
#read Power status register @00h
POWER_STATUS=$(i2cget -y -f 0 0x34 0x00)
echo -n "Battery current direction = "
[ $(($POWER_STATUS & 0x04)) -ne 0 ] && echo "Charging" \
|| echo "Discharging"
################################
#read Power OPERATING MODE register @01h
POWER_OP_MODE=$(i2cget -y -f 0 0x34 0x01)
echo -n "Charging indicator = "
[ $(($POWER_OP_MODE & 0x40)) -ne 0 ] && echo "Charging" \
|| echo "Not charging or charging completed"
###################
#read internal temperature 5eh, 5fh -144.7c -> 000h, 0.1c/bit FFFh -> 264.8c
TEMP_MSB=$(i2cget -y -f 0 0x34 0x5e)
TEMP_LSB=$(i2cget -y -f 0 0x34 0x5f)
TEMP_BIN=$(( ($TEMP_MSB << 4) | ($TEMP_LSB & 0x0F) ))
TEMP_C=$(echo "$TEMP_BIN*0.1-144.7"|bc)
echo "Internal temperature = "$TEMP_C"c"
###################
#read ACIN information
if [ $(($POWER_STATUS & 0x80)) -ne 0 ] ; then
echo "ACIN present"
ACIN_VOLT_MSB=$(i2cget -y -f 0 0x34 0x56)
ACIN_VOLT_LSB=$(i2cget -y -f 0 0x34 0x57)
ACIN_BIN=$(( ($ACIN_VOLT_MSB << 4) | ($ACIN_VOLT_LSB & 0x0F) ))
ACIN_VOLT=$(echo "$ACIN_BIN*1.7"|bc)
echo " ACIN voltage = "$ACIN_VOLT"mV"
ACIN_I_MSB=$(i2cget -y -f 0 0x34 0x58)
ACIN_I_LSB=$(i2cget -y -f 0 0x34 0x59)
ACIN_I_BIN=$(( ($ACIN_I_MSB << 4) | ($ACIN_I_LSB & 0x0F) ))
ACIN_I=$(echo "$ACIN_I_BIN*0.625"|bc)
echo " ACIN current = "$ACIN_I"mA"
else
echo "ACIN not present"
fi
###################
#read VBUS information
if [ $(($POWER_STATUS & 0x20)) -ne 0 ] ; then
echo "VBUS present"
VBIN_VOLT_MSB=$(i2cget -y -f 0 0x34 0x5a)
VBIN_VOLT_LSB=$(i2cget -y -f 0 0x34 0x5b)
VBIN_BIN=$(( ($VBIN_VOLT_MSB << 4) | ($VBIN_VOLT_LSB & 0x0F) ))
VBIN_VOLT=$(echo "$VBIN_BIN*1.7"|bc)
echo " VBUS voltage = "$VBIN_VOLT"mV"
VBIN_I_MSB=$(i2cget -y -f 0 0x34 0x5c)
VBIN_I_LSB=$(i2cget -y -f 0 0x34 0x5d)
VBIN_I_BIN=$(( ($VBIN_I_MSB << 4) | ($VBIN_I_LSB & 0x0F) ))
VBIN_I=$(echo "$VBIN_I_BIN*0.375"|bc)
echo " VBUS current = "$VBIN_I"mA"
else
echo "VBUS not present"
fi
VBUS_IPSOUT=$(i2cget -y -f 0 0x34 0x30)
VBUS_V_LIMIT=$(($VBUS_IPSOUT >> 3 & 0x07))
VBUS_V_LIMIT=$(echo "scale=2;$VBUS_V_LIMIT*0.10+4.00"|bc)
[ $(($VBUS_IPSOUT & 0x40)) -ne 0 ] && VBUS_V_LIMIT_E="Enabled" \
|| VBUS_V_LIMIT_E="Disabled"
echo " VBUS voltage limit = "$VBUS_V_LIMIT"V ("$VBUS_V_LIMIT_E")"
VBUS_I_LIMIT=$((VBUS_IPSOUT & 3))
echo -n " VBUS current limit = "
case $VBUS_I_LIMIT in
0) echo "900mA";;
1) echo "500mA";;
2) echo "100mA";;
3) echo "~spooky~ unlimited";;
*) echo "?";;
esac
################################
#read Charge control registers @33h
CHARGE_CTL=$(i2cget -y -f 0 0x34 0x33)
if [ $(($CHARGE_CTL & 0x80)) -ne 0 ] ; then
echo "Battery charging enabled"
echo -n " Charging target voltage = "
case $((($CHARGE_CTL & 0x60) >> 5)) in
0) echo "4.10V";;
1) echo "4.15V";;
2) echo "4.20V";;
3) echo "4.36V";;
*) echo "?";;
esac
CHARGE_I_LIMIT=$(($CHARGE_CTL & 0x0f))
CHARGE_I_LIMIT=$(echo "$CHARGE_I_LIMIT*100+300"|bc)
echo " Charge current limit = "$CHARGE_I_LIMIT"mA"
[ $(($CHARGE_CTL & 0x10)) -ne 0 ] && CHARGE_I_TERM="0.15" || CHARGE_I_TERM="0.10"
CHARGE_I_TERM=$(echo "$CHARGE_I_LIMIT*$CHARGE_I_TERM"|bc)
echo " Charge termination current = "$CHARGE_I_TERM"mA"
else
echo "Battery charging disabled"
fi
###################
#read BATTERY information
if [ $(($POWER_OP_MODE & 0x20)) -ne 0 ] ; then
echo "Battery present"
################################
#read battery voltage 79h, 78h 0 mV -> 000h, 1.1 mV/bit FFFh -> 4.5045 V
BAT_VOLT_MSB=$(i2cget -y -f 0 0x34 0x78)
BAT_VOLT_LSB=$(i2cget -y -f 0 0x34 0x79)
BAT_BIN=$(( ($BAT_VOLT_MSB << 4) | ($BAT_VOLT_LSB & 0x0F) ))
BAT_VOLT=$(echo "$BAT_BIN*1.1"|bc)
echo " Battery voltage = "$BAT_VOLT"mV"
###################
#read Battery Discharge Current 7Ch, 7Dh 0 mV -> 000h, 0.5 mA/bit 1FFFh -> 1800 mA
#13 bits
BAT_IDISCHG_MSB=$(i2cget -y -f 0 0x34 0x7C)
BAT_IDISCHG_LSB=$(i2cget -y -f 0 0x34 0x7D)
BAT_IDISCHG_BIN=$(( ($BAT_IDISCHG_MSB << 5) | ($BAT_IDISCHG_LSB & 0x1F) ))
BAT_IDISCHG=$(echo "($BAT_IDISCHG_BIN*0.5)"|bc)
echo " Battery discharge current = "$BAT_IDISCHG"mA"
###################
#read Battery Charge Current 7Ah, 7Bh 0 mV -> 000h, 0.5 mA/bit FFFh -> 1800 mA
#(12 bits)
BAT_ICHG_MSB=$(i2cget -y -f 0 0x34 0x7A)
BAT_ICHG_LSB=$(i2cget -y -f 0 0x34 0x7B)
BAT_ICHG_BIN=$(( ($BAT_ICHG_MSB << 4) | ($BAT_ICHG_LSB & 0x0F) ))
BAT_ICHG=$(echo "$BAT_ICHG_BIN*0.5"|bc)
echo " Battery charge current = "$BAT_ICHG"mA"
FUEL_GAUGE=$(i2cget -y -f 0 0x34 0x0b9)
FUEL_GAUGE=$(($FUEL_GAUGE&0x7f))
echo " Fuel Gauge="$FUEL_GAUGE"%"
else
echo "Battery not present"
fi
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