Here is a script that gives some info about battery (when one is plugged)
I think that this page has mistakes (http://linux-sunxi.org/AXP209#Spec_Sheets) because discharging and charging current are inverted.
#!/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 ################################ #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 $CHARG_IND BAT_EXIST=$(($(($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 $BAT_EXIST ################################ #read Charge control register @33h CHARGE_CTL=$(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 $CHARGE_CTL2 ################################ #read battery voltage 79h, 78h 0 mV -> 000h, 1.1 mV/bit FFFh -> 4.5045 V BAT_VOLT_LSB=$(i2cget -y -f 0 0x34 0x79) BAT_VOLT_MSB=$(i2cget -y -f 0 0x34 0x78) #echo $BAT_VOLT_MSB $BAT_VOLT_LSB BAT_BIN=$(( $(($BAT_VOLT_MSB << 4)) | $(($(($BAT_VOLT_LSB & 0xF0)) >> 4)) )) BAT_VOLT=$(echo "($BAT_BIN*1.1)"|bc) echo "Battery voltage = "$BAT_VOLT"mV" ################### #read Battery Discharge Current 7Ah, 7Bh 0 mV -> 000h, 0.5 mA/bit FFFh -> 4.095 V BAT_IDISCHG_LSB=$(i2cget -y -f 0 0x34 0x7B) BAT_IDISCHG_MSB=$(i2cget -y -f 0 0x34 0x7A) #echo $BAT_IDISCHG_MSB $BAT_IDISCHG_LSB BAT_IDISCHG_BIN=$(( $(($BAT_IDISCHG_MSB << 4)) | $(($(($BAT_IDISCHG_LSB & 0xF0)) >> 4)) )) BAT_IDISCHG=$(echo "($BAT_IDISCHG_BIN*0.5)"|bc) echo "Battery discharge current = "$BAT_IDISCHG"mA" ################### #read Battery Charge Current 7Ch, 7Dh 0 mV -> 000h, 0.5 mA/bit FFFh -> 4.095 V BAT_ICHG_LSB=$(i2cget -y -f 0 0x34 0x7D) BAT_ICHG_MSB=$(i2cget -y -f 0 0x34 0x7C) #echo $BAT_ICHG_MSB $BAT_ICHG_LSB BAT_ICHG_BIN=$(( $(($BAT_ICHG_MSB << 4)) | $(($(($BAT_ICHG_LSB & 0xF0)) >> 4)) )) BAT_ICHG=$(echo "($BAT_ICHG_BIN*0.5)"|bc) echo "Battery charge current = "$BAT_ICHG"mA"
this script gives the AC power status :
#!/bin/sh # This program gets the power status (AC IN or BAT) for pcDuino3 # I2C interface with AXP209 # ####################################################################### # 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. ####################################################################### #read Power status register @00h POWER_STATUS=$(i2cget -y -f 0 0x34 0x00) #echo $POWER_STATUS # bit 7 : Indicates ACIN presence 0: ACIN does not exist; 1: ACIN present #echo "bit 7 : Indicates ACIN presence 0: ACIN does not exist; 1: ACIN present" #echo "bit 2 : Indicates that the battery current direction 0: battery discharge; 1: The battery is charged" AC_STATUS=$(($(($POWER_STATUS&0x80))/128)) # divide by 128 is like shifting rigth 8 times #echo $(($POWER_STATUS&0x80)) echo "AC_STATUS="$AC_STATUS # echo $AC_STATUS
Example :
battery charging
rzbo@ubuntu:~$ ./battery_info.sh BAT_STATUS=0 CHARG_IND=1 BAT_EXIST=1 CHARGE_CTL=0xd0 CHARGE_CTL2=0x47 Battery voltage = 3895.1mV Battery discharge current = 304.0mA Battery charge current = 0mA rzbo@ubuntu:~$ ./power_status.sh AC_STATUS=1
Battery discharging (USB power unplugged)
rzbo@ubuntu:~$ ./battery_info.sh BAT_STATUS=0 CHARG_IND=0 BAT_EXIST=1 CHARGE_CTL=0xd0 CHARGE_CTL2=0x47 Battery voltage = 3678.4mV Battery discharge current = 0mA Battery charge current = 176.0mA rzbo@ubuntu:~$ ./power_status.sh AC_STATUS=0
