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Commit 715cdead authored by Martin Jäger's avatar Martin Jäger
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License changed to Apache, SOC calculation changed

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bq769x0.cpp
View file @ 715cdead
/*
bq769x0.cpp - Battery management system based on bq769x0 for ARM mbed
Copyright (C) 2015-2016 Martin Jäger (http://libre.solar)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this program. If not, see
<http://www.gnu.org/licenses/>.
*/
/*
TODO:
- CRC check for cell voltage readings
- Enable values like 1.5 mOhm for shunt resistor
- Decrease current limit if only charge OR discharge FET is on (current goes through body diode of other FET with high voltage drop) or enable ideal diodes
- Rework error handling (checkStatus method)
*/
/* Battery management system based on bq769x0 for ARM mbed
* Copyright (c) 2015-2018 Martin Jäger (www.libre.solar)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <math.h> // log for thermistor calculation
......@@ -72,19 +60,13 @@ uint8_t _crc8_ccitt_update (uint8_t inCrc, uint8_t inData)
return data;
}
//, Serial& serial
//----------------------------------------------------------------------------
bq769x0::bq769x0(I2C& bqI2C, PinName alertPin, int bqType, int bqI2CAddress, bool crc):
_i2c(bqI2C), _alertInterrupt(alertPin)
{
_timer.start();
_alertInterrupt.rise(this, &bq769x0::setAlertInterruptFlag);
I2CAddress = bqI2CAddress;
type = bqType;
crcEnabled = crc;
_alertInterrupt.rise(callback(this, &bq769x0::setAlertInterruptFlag));
// set some safe default values
autoBalancingEnabled = false;
......@@ -95,6 +77,7 @@ bq769x0::bq769x0(I2C& bqI2C, PinName alertPin, int bqType, int bqI2CAddress, boo
alertInterruptFlag = true; // init with true to check and clear errors at start-up
type = bqType;
if (type == bq76920) {
numberOfCells = 5;
} else if (type == bq76930) {
......@@ -108,23 +91,19 @@ bq769x0::bq769x0(I2C& bqI2C, PinName alertPin, int bqType, int bqI2CAddress, boo
cellVoltages[i] = 0;
}
// test communication
writeRegister(CC_CFG, 0x19); // should be set to 0x19 according to datasheet
if (readRegister(CC_CFG) == 0x19)
//crcEnabled = crc;
//I2CAddress = bqI2CAddress;
if (determineAddressAndCrc())
{
// initial settings for bq769x0
writeRegister(SYS_CTRL1, 0b00011000); // switch external thermistor and ADC on
writeRegister(SYS_CTRL2, 0b01000000); // switch CC_EN on
// attach ALERT interrupt to this instance
//instancePointer = this;
//attachInterrupt(digitalPinToInterrupt(alertPin), bq769x0::alertISR, RISING);
// get ADC offset and gain
adcOffset = (signed int) readRegister(ADCOFFSET); // convert from 2's complement
adcGain = 365 + (((readRegister(ADCGAIN1) & 0b00001100) << 1) |
((readRegister(ADCGAIN2) & 0b11100000) >> 5)); // uV/LSB
}
else {
// TODO: do something else... e.g. set error flag
......@@ -134,6 +113,41 @@ bq769x0::bq769x0(I2C& bqI2C, PinName alertPin, int bqType, int bqI2CAddress, boo
}
}
//----------------------------------------------------------------------------
// automatically find out address and CRC setting
bool bq769x0::determineAddressAndCrc(void)
{
I2CAddress = 0x08;
crcEnabled = true;
writeRegister(CC_CFG, 0x19);
if (readRegister(CC_CFG) == 0x19) {
return true;
}
I2CAddress = 0x18;
crcEnabled = true;
writeRegister(CC_CFG, 0x19);
if (readRegister(CC_CFG) == 0x19) {
return true;
}
I2CAddress = 0x08;
crcEnabled = false;
writeRegister(CC_CFG, 0x19);
if (readRegister(CC_CFG) == 0x19) {
return true;
}
I2CAddress = 0x18;
crcEnabled = false;
writeRegister(CC_CFG, 0x19);
if (readRegister(CC_CFG) == 0x19) {
return true;
}
return false;
}
//----------------------------------------------------------------------------
// Boot IC by pulling the boot pin TS1 high for some ms
......@@ -465,6 +479,7 @@ float bq769x0::getSOC(void)
}
//----------------------------------------------------------------------------
// SOC calculation based on average cell open circuit voltage
void bq769x0::resetSOC(int percent)
{
......@@ -474,7 +489,7 @@ void bq769x0::resetSOC(int percent)
}
else // reset based on OCV
{
int voltage = getMaxCellVoltage();
int voltage = getBatteryVoltage() / getNumberOfConnectedCells();
coulombCounter = 0; // initialize with totally depleted battery (0% SOC)
......@@ -679,6 +694,19 @@ int bq769x0::getCellVoltage(int idCell)
return cellVoltages[idCell-1];
}
//----------------------------------------------------------------------------
int bq769x0::getNumberOfCells(void)
{
return numberOfCells;
}
//----------------------------------------------------------------------------
int bq769x0::getNumberOfConnectedCells(void)
{
return connectedCells;
}
//----------------------------------------------------------------------------
......@@ -767,6 +795,7 @@ void bq769x0::updateVoltages()
{
long adcVal = 0;
char buf[4];
int connectedCellsTemp = 0;
// read battery pack voltage
adcVal = (readRegister(BAT_HI_BYTE) << 8) | readRegister(BAT_LO_BYTE);
......@@ -792,6 +821,10 @@ void bq769x0::updateVoltages()
cellVoltages[i] = adcVal * adcGain / 1000 + adcOffset;
if (cellVoltages[i] > 500) {
connectedCellsTemp++;
}
if (cellVoltages[i] > cellVoltages[idCellMaxVoltage]) {
idCellMaxVoltage = i;
}
......@@ -799,6 +832,7 @@ void bq769x0::updateVoltages()
idCellMinVoltage = i;
}
}
connectedCells = connectedCellsTemp;
}
//----------------------------------------------------------------------------
......
bq769x0.h
View file @ 715cdead
/*
bq769x0.h - Battery management system based on bq769x0 for ARM mbed
Copyright (C) 2015-2016 Martin Jäger (http://libre.solar)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this program. If not, see
<http://www.gnu.org/licenses/>.
*/
/* Battery management system based on bq769x0 for ARM mbed
* Copyright (c) 2015-2018 Martin Jäger (www.libre.solar)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef BQ769X0_H
#define BQ769X0_H
......@@ -59,6 +56,9 @@ public:
void setBatteryCapacity(long capacity_mAh);
void setOCV(int voltageVsSOC[NUM_OCV_POINTS]);
int getNumberOfCells(void);
int getNumberOfConnectedCells(void);
// limit settings (for battery protection)
void setTemperatureLimits(int minDischarge_degC, int maxDischarge_degC, int minCharge_degC, int maxCharge_degC); // °C
long setShortCircuitProtection(long current_mA, int delay_us = 70);
......@@ -81,6 +81,7 @@ public:
int getCellVoltage(int idCell); // from 1 to 15
int getMinCellVoltage(void);
int getMaxCellVoltage(void);
int getAvgCellVoltage(void);
float getTemperatureDegC(int channel = 1);
float getTemperatureDegF(int channel = 1);
float getSOC(void);
......@@ -98,7 +99,6 @@ private:
// Variables
I2C& _i2c;
//Serial _debug;
Timer _timer;
InterruptIn _alertInterrupt;
......@@ -113,7 +113,8 @@ private:
// indicates if a new current reading or an error is available from BMS IC
bool alertInterruptFlag;
int numberOfCells;
int numberOfCells; // number of cells allowed by IC
int connectedCells; // actual number of cells connected
int cellVoltages[MAX_NUMBER_OF_CELLS]; // mV
int idCellMaxVoltage;
int idCellMinVoltage;
......@@ -155,6 +156,8 @@ private:
// Methods
bool determineAddressAndCrc(void);
void updateVoltages(void);
void updateCurrent(void);
void updateTemperatures(void);
......
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