Nokia N900 >> Native Debian

battery calibration


參考資訊:
1. calibration

N900的BQ27200電路圖如下:


步驟如下:
1. 電池充滿電
2. 執行如下命令:

$ sudo apt-get install i2c-tools -y
$ sudo rmmod bq27xxx_battery_i2c
$ sudo rmmod bq27xxx_battery
$ sudo rmmod rx51_battery
$ sudo dd if=/dev/zero of=/dev/null bs=1M &
$ sudo ./bq27200.sh 5

3. 拔掉充電器
4. 接著讓機器放電到0%,電源管理IC就會自動校準

bq27200.sh

#!/bin/sh

# Assuming 30 mOhm sense resistance
RS=21

debugecho()
{
  if [ $LOOPMODE -eq 0 ]; then
    echo $*
  fi
}
debugechon()
{
  if [ $LOOPMODE -eq 0 ]; then
    echo -n $*
  fi
}
dot()
{
  debugechon "."
}

LOOPMODE=0
LOOPCOUNT=0
if [ -n "$1" ] ; then
  if [ $(($1)) -gt 5 ] ; then
    LOOPMODE=$(($1))
  else
    LOOPMODE=5
  fi
fi

echo LOOPMODE=$LOOPMODE

doit=1
while [ $doit -eq 1 ] ; do ## MAIN LOOP ##

doit=0
############## Data acquisition ##############

#debugechon "About to stop bme. "
#killall -STOP bme_RX-51
#debugecho "Bme stopped."
# sleep 1;
debugechon "Reading values"

AR=$(i2cget -y 2 0x55 0x02 w) ; dot
ARTTE=$(i2cget -y 2 0x55 0x04 w); dot
VOLT=$(i2cget -y 2 0x55 0x08 w) ; dot
TEMP=$(i2cget -y 2 0x55 0x06 w) ; dot
CSOC=$(i2cget -y 2 0x55 0x2c)  ; dot
RSOC=$(i2cget -y 2 0x55 0x0b)  ; dot
NAC=$(i2cget -y 2 0x55 0x0c w) ; dot
CACD=$(i2cget -y 2 0x55 0x0e w) ; dot
CACT=$(i2cget -y 2 0x55 0x10 w); dot
AI=$(i2cget -y 2 0x55 0x14 w)  ; dot
TTF=$(i2cget -y 2 0x55 0x18 w) ; dot
TTE=$(i2cget -y 2 0x55 0x16 w) ; dot
FLAGS=$(i2cget -y 2 0x55 0x0A) ; dot


if [ $LOOPMODE -eq 0 ] ; then
CYCL=$(i2cget -y 2 0x55 0x28 w) ; dot
CYCLTL=$(i2cget -y 2 0x55 0x2a w) ; dot
SI=$(i2cget -y 2 0x55 0x1A w) ; dot
STTE=$(i2cget -y 2 0x55 0x1C w); dot
MLI=$(i2cget -y 2 0x55 0x1e w) ; dot
MLTTE=$(i2cget -y 2 0x55 0x20 w); dot
LMD=$(i2cget -y 2 0x55 0x12 w) ; dot

ILMD=$(i2cget -y 2 0x55 0x76); dot
EDVF=$(i2cget -y 2 0x55 0x77); dot
EDV1=$(i2cget -y 2 0x55 0x78); dot
ISLC=$(i2cget -y 2 0x55 0x79); dot
DMFSD=$(i2cget -y 2 0x55 0x7A); dot
TAPER=$(i2cget -y 2 0x55 0x7B); dot
#TODO: PKCFG
IMLC=$(i2cget -y 2 0x55 0x7D); dot
fi

debugecho "done."
#debugechon  "Waking up bme."
#killall -CONT bme_RX-51
#debugecho "Done. "
debugecho ""

############## Calculate ##############

CSOC=$(($CSOC))                      # CSOC Compensated state of charge %. CACT/LMD * 100
RSOC=$(($RSOC))                      # RSOC Relative state of charge %. NAC/LMD * 100
NAC=$(($NAC * 3570 / $RS / 1000))    # NAC Nominal available capaciy, mAh.
CACD=$(($CACD * 3570 / $RS / 1000))  # CACD Discharge rate compensated available capacity, mAh.
CACT=$(($CACT * 3570 / $RS / 1000))  # CACT Temperature compensated CACD, mAh.
AI=$(($AI * 3570 / $RS / 1000))      # AI Average (last 5.12 seconds) current, mA.
VOLT=$(($VOLT))                      # VOLT Battery voltage, mV.
TTF=$(($TTF))                        # TTF Time to Full minutes. 65535 if no charging.
TTE=$(($TTE))                        # TTE Time to Empty minutes. 65535 if charging.

F=$(($FLAGS))
FLAGS_CHARGE=$(($F/128))             # There is charging activity. AI is measuring charge current.
F=$(($F-$F/128*128))
FLAGS_NOACT=$(($F/64))               # No charge/discharge activity detected.
F=$(($F-$F/64*64))
FLAGS_IMIN=$(($F/32))                # Charge current has tapered off (battery charge is near/at completion)
F=$(($F-$F/32*32))
FLAGS_CI=$(($F/16))                  # Capacity inaccurate. >32 cycles since last learning cycle.
F=$(($F-$F/16*16))
FLAGS_CALIP=$(($F/8))                # External offset calibration in progress.
F=$(($F-$F/8*8))
FLAGS_VDQ=$(($F/4))                  # Valid discharge. All requirements met for learning the battery's capacity when reaching EDV1
F=$(($F-$F/4*4))
FLAGS_EDV1=$(($F/2))                 # First end of discharge-voltage flag. Battery voltage is at or below preprogrammed EDV1 threshold. If VDQ is 1, LMD is updated and VDQ set to 0.
F=$(($F-$F/2*2))
FLAGS_EDVF=$F                        # Final end of discharge-voltage flag. The battery has discharged to 0% threshold.


if [ $LOOPMODE -eq 0 ] ; then
AR=$(($AR * 3570 / $RS / 1000))      # AR At-rate
ARTTE=$(($ARTTE))                    # At-rate time to empty
LMD=$(($LMD * 3570 / $RS / 1000))    # LM Last measured discharge, mAh.
SI=$(($SI * 3570/ $RS / 1000))       # SI Standby Current, mA.
STTE=$(($STTE))                      # STTE Time to empty at standby, minutes.
MLI=$(($MLI * 3570 / $RS / 1000))    # MLI Maximum Load Current, mA.
MLTTE=$(($MLTTE))                    # MLTTE Time to empty at maximum load, minutes.
CYCL=$(($CYCL))                      # CYCL Cycles since last learning cycle (last time LMD was updated)
CYCLTL=$(($CYCLTL))                  # CYCLTL Cycles since last full reset.

ILMD=$(($ILMD * 913920 / $RS / 1000)) # eeprom Initial Last Measured Discharge. LMD = ILMD if no valid learning cycle has been completed.
EDVF=$(($EDVF * 8 + 8*256))           # eeprom End of discharge voltage threshold.
EDV1=$(($EDV1 * 8 + 8*256))           # eeprom 6.25% Capacity voltage threshold.
ISLC=$(($ISLC * 7140 / $RS / 1000))   # eeprom Initial standby load current.

# DMF in bits 4:7
DMF=$(($DMFSD/16))
# SD in bits 0:3
SD=$(($DMFSD-$DMF*16))
DMF=$(($DMF * 4900))                 # eeprom Digital Magnitude Filter, nanoVolts
SD=$((1610 / $SD))                   # eeprom Self Discharge rate, thousandth of percent (1/1000 %) per day at 25 degrees celcius

AGELMD=$(($TAPER/128))               # eeprom Battery capacity aging estimation on/off
TAPER=$(($TAPER-$AGELMD*128))
TAPER=$(($TAPER * 228000 / $RS / 1000))  # eeprom Taper current mA

IMLC=$(($IMLC * 457000 / $RS / 1000))    # eeprom Initial Max Load Current

fi

############## Display ##############

if [ $LOOPMODE -eq 0 ] ; then 

echo -n CSOC: $CSOC "% "
echo RSOC: $RSOC "%"
echo Average Current: $AI mA
echo -n TTF: $(($TTF)) "minutes "
echo TTE: $(($TTE)) minutes

echo -n NAC: $NAC "mAh "
echo -n CACD: $CACD "mAh "
echo CACT: $CACT "mAh "

echo -n SI: $SI "mA "
echo  STTE: $STTE "minutes"

echo -n MLI: $MLI "mA "
echo  MLTTE: $MLTTE "minutes"

echo -n AR: $AR "mA "
echo ARTTE: $ARTTE "minutes"

echo Last Measured Discharge: $LMD mAh
echo Cycle Count since Learning: $CYCL Total Cycle Count since last full reset: $CYCLTL
echo Reported Battery Voltage: $VOLT mV
echo Battery Gauge die Temperature: $(($TEMP * 250 / 1000 - 273)) C
echo -e "Flags:\t" $FLAGS
echo -e "\t" Charge:$FLAGS_CHARGE NOACT:$FLAGS_NOACT IMIN:$FLAGS_IMIN CI:$FLAGS_CI CALIP:$FLAGS_CALIP VDQ:$FLAGS_VDQ EDV1:$FLAGS_EDV1 EDVF: $FLAGS_EDVF
echo -e "eeprom data:"
echo -e "\t" ILMD=$ILMD EDVF=$EDVF EDV1=$EDV1 ISLC=$ISLC
echo -e "\t" DMF=$DMF nanoVolt SD=$SD thousandths of percent per day
echo -e "\t" AGELMD=$AGELMD TAPER=$TAPER mA
echo -e "\t" IMLC=$IMLC mA

else # loopmode

if [ $LOOPCOUNT -eq 0 ] ; then
  LOOPCOUNT=24
  echo -e "      mv   RSOC CSOC mA   NAC  CACD CACT TTF   TTE   TEMP EDV1 LOW"
fi
LOOPCOUNT=$(($LOOPCOUNT-1))

C=$AI
if [ $FLAGS_CHARGE -eq 0 ] ; then
  C="-"$C
fi
printf "$(date +%H:%M) %4d %-3d  %-3d  %-4d %-4d %-4d %-4d %-5d %-5d %-3d %d\n" $VOLT $RSOC $CSOC $C $NAC $CACD $CACT $TTF $TTE $(($TEMP * 250 /1000 - 273)) $FLAGS_EDV1 

if [ $FLAGS_EDV1 -eq 1 ] ; then
  poweroff
fi

sleep $LOOPMODE
doit=1
fi # if loopmode

done # main


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