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Chip Battery.sh

#!/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.
#######################################################################

# force ADC enable for battery voltage and current
#i2cset -y -f 0 0x34 0x82 0xC3
i2cset -y -f 0 0x34 0x82 0xff

################################
#read Power status register @00h
POWER_STATUS=$(i2cget -y -f 0 0x34 0x00)
#echo $POWER_STATUS

BAT_STATUS=$(($(($POWER_STATUS&0x02))/2)) # divide by 2 is like shifting rigth 1 times
#echo $(($POWER_STATUS&0x02))
echo "BAT_STATUS="$BAT_STATUS
# echo $BAT_STATUS

################################
#read Power OPERATING MODE register @01h
POWER_OP_MODE=$(i2cget -y -f 0 0x34 0x01)
#echo $POWER_OP_MODE

CHARG_IND=$(($(($POWER_OP_MODE&0x40))/64)) # divide by 64 is like shifting rigth 6 times
#echo $(($POWER_OP_MODE&0x40))
echo "CHARG_IND="$CHARG_IND
# echo $CHARG_IND

[ $(($POWER_STATUS & 0x80)) -ne 0 ] && {
 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"
}
[ $(($POWER_STATUS & 0x20)) -ne 0 ] && {
 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"
}

################################
#read Charge control register @33h
CHARGE_CTL=$(i2cget -y -f 0 0x34 0x33)
echo "CHARGE_CTL="$CHARGE_CTL
# echo $CHARGE_CTL


################################
#read Charge control register @34h
CHARGE_CTL2=$(i2cget -y -f 0 0x34 0x34)
echo "CHARGE_CTL2="$CHARGE_CTL2
# echo $CHARGE_CTL2

###################
#read internal temperature 5eh, 5fh -144.7c -> 000h, 0.1c/bitFFFh -> 264.8c
TEMP_MSB=$(i2cget -y -f 0 0x34 0x5e)
TEMP_LSB=$(i2cget -y -f 0 0x34 0x5f)

# bash math -- converts hex to decimal so `bc` won't complain later...
# MSB is 8 bits, LSB is lower 4 bits
TEMP_BIN=$(( $(($TEMP_MSB << 4)) | $(($(($TEMP_LSB & 0x0F)) )) ))

TEMP_C=$(echo "($TEMP_BIN*0.1-144.7)"|bc)
echo "Internal temperature = "$TEMP_C"c"

BAT_EXIST=$(($(($POWER_OP_MODE&0x20))/32)) # divide by 32 is like shifting rigth 5 times
#echo $(($POWER_OP_MODE&0x20))
echo "BAT_EXIST="$BAT_EXIST
# echo $BAT_EXIST

[ $BAT_EXIST -ne 0 ] && {
################################
#read battery voltage 79h, 78h 0 mV -> 000h, 1.1 mV/bit FFFh -> 4.5045 V
BAT_VOLT_MSB=$(i2cget -y -f 0 0x34 0x78)
BAT_VOLT_LSB=$(i2cget -y -f 0 0x34 0x79)

#echo $BAT_VOLT_MSB $BAT_VOLT_LSB
# bash math -- converts hex to decimal so `bc` won't complain later...
# MSB is 8 bits, LSB is lower 4 bits
BAT_BIN=$(( $(($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
#AXP209 datasheet is wrong, discharge current is in registers 7Ch 7Dh
#13 bits
BAT_IDISCHG_MSB=$(i2cget -y -f 0 0x34 0x7C)
BAT_IDISCHG_LSB=$(i2cget -y -f 0 0x34 0x7D)

#echo $BAT_IDISCHG_MSB $BAT_IDISCHG_LSB

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
#AXP209 datasheet is wrong, charge current is in registers 7Ah 7Bh
#(12 bits)
BAT_ICHG_MSB=$(i2cget -y -f 0 0x34 0x7A)
BAT_ICHG_LSB=$(i2cget -y -f 0 0x34 0x7B)

#echo $BAT_ICHG_MSB $BAT_ICHG_LSB

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%"
}

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