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SBMInfo.ino
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SBMInfo.ino
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/*
* SBMInfo.ino
* Shows Smart Battery Info
*
* If a Li-ion supply is detected, the LCD display timing for standalone usage (without serial connection) is activated.
*
* Copyright (C) 2016-2023 Armin Joachimsmeyer
* armin.joachimsmeyer@gmail.com
*
* https://github.com/ArminJo/Smart-Battery-Module-Info_For_Arduino
*
* SBMInfo is free software: you can redistribute it and/or modify
* it under the terms of the GNU 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 General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/gpl.html>.
*
*/
#include <Arduino.h>
#include "SBMInfo.h"
#include <Wire.h>
#include "ADCUtils.hpp"
#define VERSION_EXAMPLE "4.3"
#if defined(__AVR__)
/*
* Available only for some AVR CPU's like ATmega328
* This requires 4 resistors at Pins A0 to A3, see documentation in file MeasureVoltageAndResistance.hpp
*/
#define USE_VOLTAGE_AND_RESISTANCE_MEASUREMENT
#endif // defined(__AVR__)
/*
* The charge control pin is high as long as relative charge is below 95%.
* It can be used to control a NPN transistor, which collector controls a high side P FET
*/
#define CHARGE_CONTROL_PIN 9
#define CHARGE_SWITCH_OFF_PERCENTAGE 95
/*
* The discharge control pin is high as long as relative charge is above 5% AND 3300 mV. It can be used to control a logic level FET directly.
*/
#define DISCHARGE_CONTROL_PIN 10
#define DISCHARGE_SWITCH_OFF_PERCENTAGE 5
#define DISCHARGE_SWITCH_OFF_MILLIVOLT 3300 // to be below the guessed EDV2 value
bool sCellVoltageIsBelowSwitchOffThreshold;
void checkChargeAndDischargeLimits();
#define VOLTAGE_USB_LOWER_THRESHOLD_MILLIVOLT 4300 // Assume USB powered, if voltage is higher, PIN_ONLY_PLOTTER_OUTPUT logic is reversed. I.e. plotter output is enabled if NOT connected to ground.
#define FORCE_LCD_DISPLAY_TIMING_PIN 11 // If pulled to ground and VCC is > 4300 mV, forces slow display timing as used for standalone mode (with Li-ion supply)
#define MILLIS_BETWEEN_READING_FOR_CHANGED_VALUES 3000
/*
* Activate the type of LCD connection you use.
* If no element selected, only serial output is generated.
*/
#define USE_PARALLEL_LCD // Uses pin 3 to 8
//#define USE_SERIAL_LCD // Currently not available, since LiquidCrystal_I2C does not support write of byte arrays
#if defined(USE_SERIAL_LCD) && defined(USE_PARALLEL_LCD)
#error Cannot use parallel and serial LCD simultaneously
#endif
#if defined(USE_SERIAL_LCD) || defined(USE_PARALLEL_LCD)
#define USE_LCD
#endif
/*
* LCD Display before device connected
* 1. line: "SBMInfo" | Version | VCC voltage
* 2. line: Date of program compilation
* 3. line: "Scan for device" | Scan counter
* 4. line: Resistance or Voltage
*
* LCD Display after device connected
* 1. line: "SBMInfo" | Version
* 2. line: Date of program compilation | Manufacturer name
* 3. line: Manufacturer date (YYYY-MM-DD) | Battery cycle count
* 4. line: Design voltage | Design capacity
*
* LCD Display dynamic data
* 1. line: Voltage | Current (negative for discharging) | optional 'H' for read error (hold)
* 2. line: Percent of designed full charge capacity | Design capacity -> Full charge capacity
* 3. line: Percent of relative charge
* 3. line: Time to empty of full at current current (of line 1)
* 4. line: Currently available (remaining) capacity
*/
/*
* Imports and definitions for LCD
*/
#if defined(USE_SERIAL_LCD)
#include <LiquidCrystal_I2C.h> // Use an up to date library version which has the init method
#endif
#if defined(USE_PARALLEL_LCD)
#include "LiquidCrystal.h"
#endif
// Definitions required for a 2004 LCD
#define LCD_COLUMNS 20
#define LCD_ROWS 4
#define USE_2004_LCD
#if defined(USE_SERIAL_LCD)
LiquidCrystal_I2C myLCD(0x27, LCD_COLUMNS, LCD_ROWS); // set the LCD address to 0x27 for a 16 chars and 2 line display
#endif
#if defined(USE_PARALLEL_LCD)
//LiquidCrystal myLCD(2, 3, 4, 5, 6, 7);
//LiquidCrystal myLCD(7, 8, A0, A1, A2, A3);
LiquidCrystal myLCD(7, 8, 3, 4, 5, 6); // This also clears display
#endif
#if defined(USE_VOLTAGE_AND_RESISTANCE_MEASUREMENT) // Available only for some AVR CPU's like ATmega328
#define NO_PRINT_OF_RESISTOR_MEASURMENT_VOLTAGE
// Include it after LCD settings, it requires the macros USE_LCD and USE_2004_LCD to be set
#include "MeasureVoltageAndResistance.hpp"
#endif
#include "WireUtils.hpp"
/*
* Version 4.3 - 11/2023
* - Fixed no voltage measurement bug.
* - Improved print and LCD display after I2C reconnection.
*
* Version 4.2 - 8/2023
* - Removed compile time warnings.
*
* Version 4.1 - 3/2022
* - Support for automatic discharge and charge.
* - Improved output.
*
* Version 4.0 - 10/2021
* - Integrated voltage and resistance measurement.
* - Major improvements in I2C communication and output.
* - Detection of disconnect.
*
* Version 3.3 - 3/2021
* - Improved standalone output.
*
* Version 3.2 - 3/2020
* - Improved error handling.
* - Better prints at scanning.
*/
//#define DEBUG
/*
* Uses A4/A5 - the hardware I2C pins on Arduino
*/
#define DATA_BUFFER_LENGTH 32 // For Block Read
uint8_t sI2CDataBuffer[DATA_BUFFER_LENGTH];
uint8_t sI2CDeviceAddress = SBM_DEVICE_ADDRESS; // >= 128 means invalid
void LCDPrintSpaces(uint8_t aNumberOfSpacesToPrint);
void LCDClearLine(uint8_t aLineNumber);
void prettyPrintDescription(const char *aDescription);
void prettyPrintDescription(const __FlashStringHelper *aDescription);
void prettyPrintlnValueDescription(const __FlashStringHelper *aDescription);
void printHexAndBinary(struct SBMFunctionDescriptionStruct *aSBMFunctionDescription, uint16_t aValue);
void printlnHex(uint16_t aValue);
void printCycleCount(struct SBMFunctionDescriptionStruct *aSBMFunctionDescription, uint16_t aValue);
void printCapacity(struct SBMFunctionDescriptionStruct *aSBMFunctionDescription, uint16_t aCapacity);
void printPercentage(struct SBMFunctionDescriptionStruct *aSBMFunctionDescription, uint16_t aPercentage);
void printRelativeCharge(struct SBMFunctionDescriptionStruct *aSBMFunctionDescription, uint16_t aPercentage);
void printTime(struct SBMFunctionDescriptionStruct *aSBMFunctionDescription, uint16_t aMinutes);
void printBatteryMode(struct SBMFunctionDescriptionStruct *aSBMFunctionDescription, uint16_t aMode);
void printPackStatus(struct SBMFunctionDescriptionStruct *aSBMFunctionDescription, uint16_t aStatus);
void printBatteryStatus(struct SBMFunctionDescriptionStruct *aSBMFunctionDescription, uint16_t aStatus);
void printSpecificationInfo(struct SBMFunctionDescriptionStruct *aSBMFunctionDescription, uint16_t aSpecificationInfo);
void printManufacturerDate(struct SBMFunctionDescriptionStruct *aSBMFunctionDescription, uint16_t aDate);
void printVoltage(struct SBMFunctionDescriptionStruct *aSBMFunctionDescription, uint16_t aVoltageMillivolt);
void printCellVoltage(struct SBMFunctionDescriptionStruct *aSBMFunctionDescription, uint16_t aVoltage);
void printCurrent(struct SBMFunctionDescriptionStruct *aSBMFunctionDescription, uint16_t aCurrent);
void printTemperature(struct SBMFunctionDescriptionStruct *aSBMFunctionDescription, uint16_t aTemperature);
void printFunctionDescriptionArray(struct SBMFunctionDescriptionStruct *aSBMFunctionDescription, uint8_t aLengthOfArray);
void readWordAndPrint(struct SBMFunctionDescriptionStruct *aSBMFunctionDescription);
void printSBMStaticInfo(void);
void printSBMManufacturerInfo(void);
void checkForSBMNonStandardInfoSupported();
void printSBMNonStandardInfo();
void printSBMATRateInfo(void);
void printInitialInfo();
bool testReadAndPrint();
void TogglePin(uint8_t aPinNr);
#define I2C_RETRY_DELAY_MILLIS 10 // 5 was successful for me
uint16_t readWord(uint8_t aCommand);
void writeWord(uint8_t aCommand, uint16_t aValue);
int readWordFromManufacturerAccess(uint16_t aManufacturerCommand);
uint8_t readBlock(uint8_t aCommand, uint8_t *aDataBufferPtr, uint8_t aDataBufferLength);
void MeasureVoltageAndResistance();
#define FULL_CHARGE_CAPACITY_LCD_ROW_NON_STANDARD_SUPPORTED 2 // In row 1 we have the non standard info / cell voltages
#define FULL_CHARGE_CAPACITY_LCD_ROW_NON_STANDARD_NOT_SUPPORTED 1 // Starting with row 0
#define DESIGN_CAPACITY_LCD_ROW 3 // Starting with row 0
#define REMAINING_CAPACITY_LCD_ROW 3 // Starting with row 0
#define CURRENT_LCD_ROW 0 // Starting with row 0
#define VOLTAGE_LCD_ROW 0 // Starting with row 0
#define DESIGN_VOLTAGE_LCD_ROW 3 // Starting with row 0
#define CELL_VOLTAGE_LCD_ROW 1 // Starting with row 0
#define ESR_LCD_ROW 2 // Starting with row 0
#define REMAINING_TIME_LCD_ROW 2 // Starting with row 0
/*
* Command definitions
*/
#define PRINT_VALUE_START_COLUMN 36
const char Serial_Number[] PROGMEM = "Serial number";
const char Manufacture_Date[] PROGMEM = "Manufacture date (YYYY-MM-DD)";
const char Design_Capacity[] PROGMEM = "Design capacity";
const char Design_Voltage[] PROGMEM = "Design voltage";
const char Charging_Current[] PROGMEM = "Charging current";
const char Charging_Voltage[] PROGMEM = "Charging voltage";
const char Remaining_Capacity_Alarm[] PROGMEM = "Remaining capacity alarm";
const char Specification_Info[] PROGMEM = "SBM protocol (Version / Revision)";
const char Cycle_Count[] PROGMEM = "Cycle count";
const char Max_Error_of_charge_calculation[] PROGMEM = "Max error of charge calculation";
const char RemainingTimeAlarm[] PROGMEM = "Remaining time alarm";
const char Battery_Mode[] PROGMEM = "Battery mode";
const char Pack_Status[] PROGMEM = "Pack config and status";
struct SBMFunctionDescriptionStruct sBatteryModeFuctionDescription = { BATTERY_MODE, Battery_Mode, &printBatteryMode, NULL, 0, 0 };
/*
* Design voltage must be read before reading other capacity values for conversion of mWh to mAh
*/
struct SBMFunctionDescriptionStruct sSBMStaticFunctionDescriptionArray[] = { {
SERIAL_NUM, Serial_Number, NULL, NULL, 0, 0 }, {
MFG_DATE, Manufacture_Date, &printManufacturerDate, NULL, 0, 0 }, {
DESIGN_VOLTAGE, Design_Voltage, &printVoltage, "", 0, 0 }, {
DESIGN_CAPACITY, Design_Capacity, &printCapacity, "", 0, 0 }/* DescriptionLCD must be not NULL */, {
CHARGING_CURRENT, Charging_Current, &printCurrent, NULL, 0, 0 }, {
CHARGING_VOLTAGE, Charging_Voltage, &printVoltage, NULL, 0, 0 }, {
SPEC_INFO, Specification_Info, &printSpecificationInfo, NULL, 0, 0 }, {
CYCLE_COUNT, Cycle_Count, &printCycleCount, " cycl.", 0, 0 }, {
MAX_ERROR, Max_Error_of_charge_calculation, &printPercentage, NULL, 0, 0 }, {
REMAINING_TIME_ALARM, RemainingTimeAlarm, &printTime, NULL, 0, 0 }, {
REMAINING_CAPACITY_ALARM, Remaining_Capacity_Alarm, &printCapacity, NULL, 0, 0 } };
const char Full_Charge_Capacity[] PROGMEM = "Full charge capacity";
const char Remaining_Capacity[] PROGMEM = "Remaining capacity";
const char Relative_Charge[] PROGMEM = "Relative charge";
const char Absolute_Charge[] PROGMEM = "Absolute charge";
const char Minutes_remaining_until_empty[] PROGMEM = "Minutes remaining until empty";
const char Average_minutes_remaining_until_empty[] PROGMEM = "Average minutes remaining until empty ";
const char Minutes_remaining_for_full_charge[] PROGMEM = "Minutes remaining for full charge";
const char Battery_Status[] PROGMEM = "Battery status (BIN)";
const char Voltage[] PROGMEM = "Voltage";
const char Current[] PROGMEM = "Current";
const char Average_Current_of_last_minute[] PROGMEM = "Average current of last minute";
const char Temperature[] PROGMEM = "Temperature";
#define VOLTAGE_PRINT_DELTA_MILLIVOLT 5 // Print only if changed by two ore more mV
#define VOLTAGE_PRINT_DELTA_MILLIAMPERE 2 // Print only if changed by two ore more mA
#define VOLTAGE_PRINT_DELTA_MILLIDEGREE 100 // Print only if changed by 0.1 ore more degree
struct SBMFunctionDescriptionStruct sSBMDynamicFunctionDescriptionArray[] = { {
RELATIVE_SOC, Relative_Charge, &printRelativeCharge, NULL, 0, 0 }, { /* Must be first, because value is printed in Remaining_Capacity */
ABSOLUTE_SOC, Absolute_Charge, &printPercentage, NULL, 0, 0 }, {
FULL_CHARGE_CAPACITY, Full_Charge_Capacity, &printCapacity, "", 0, 0 }/* DescriptionLCD must be not NULL */, {
REMAINING_CAPACITY, Remaining_Capacity, &printCapacity, " remCap", 0, 0 }, {
VOLTAGE, Voltage, &printVoltage, "", VOLTAGE_PRINT_DELTA_MILLIVOLT, 0 } /* DescriptionLCD must be not NULL */, {
CURRENT, Current, &printCurrent, "", VOLTAGE_PRINT_DELTA_MILLIAMPERE, 0 } /* DescriptionLCD must be not NULL */, {
AVERAGE_CURRENT, Average_Current_of_last_minute, &printCurrent, NULL, 5, 0 } /* Print only changes of 5 mA or more */, {
TEMPERATURE, Temperature, &printTemperature, NULL, VOLTAGE_PRINT_DELTA_MILLIDEGREE, 0 }, {
RUN_TIME_TO_EMPTY, Minutes_remaining_until_empty, &printTime, " min ", 0, 0 }, {
AVERAGE_TIME_TO_EMPTY, Average_minutes_remaining_until_empty, &printTime, NULL, 0, 0 }, {
TIME_TO_FULL, Minutes_remaining_for_full_charge, &printTime, " min ", 0, 0 }, {
BATTERY_STATUS, Battery_Status, &printBatteryStatus, NULL, 0, 0 }, {
PACK_STATUS, Pack_Status, &printPackStatus, NULL, 0, 0 } };
/*
* SBM non standard info
* These aren't part of the standard, but work with some packs.
*/
const char Cell_1_Voltage[] PROGMEM = "Cell 1 Voltage";
const char Cell_2_Voltage[] PROGMEM = "Cell 2 Voltage";
const char Cell_3_Voltage[] PROGMEM = "Cell 3 Voltage";
const char Cell_4_Voltage[] PROGMEM = "Cell 4 Voltage";
const char State_of_Health[] PROGMEM = "State of Health";
#define NON_STANDARD_INFO_NOT_SUPPORTED 0
#define NON_STANDARD_INFO_SUPPORTED 1
#define NON_STANDARD_INFO_UNKNOWN_SUPPORTED 2 // Non standard info is NO cell voltage
// for plausi check
#define NON_STANDARD_INFO_CELL_MILLIVOLT_HIGH 5000
#define NON_STANDARD_INFO_CELL_MILLIVOLT_LOW 3000
int sNonStandardInfoSupportedByPack;
struct SBMFunctionDescriptionStruct sSBMNonStandardFunctionDescriptionArray[] = { {
CELL1_VOLTAGE, Cell_1_Voltage, &printCellVoltage, NULL, VOLTAGE_PRINT_DELTA_MILLIVOLT, 0 }, {
CELL2_VOLTAGE, Cell_2_Voltage, &printCellVoltage, NULL, VOLTAGE_PRINT_DELTA_MILLIVOLT, 0 }, {
CELL3_VOLTAGE, Cell_3_Voltage, &printCellVoltage, NULL, VOLTAGE_PRINT_DELTA_MILLIVOLT, 0 }, {
CELL4_VOLTAGE, Cell_4_Voltage, &printCellVoltage, NULL, VOLTAGE_PRINT_DELTA_MILLIVOLT, 0 }, {
STATE_OF_HEALTH, State_of_Health, NULL, NULL, 0, 0 } };
bool sCapacityModePower; // false = current, true = power
uint16_t sDesignVoltageMillivolt; // to retrieve last value for mWh to mA conversion
uint16_t sDesignCapacity; // to compute relative capacity percent
uint16_t sDesignCapacityMilliAmpereHour; // for LCD output
uint16_t sRelativeChargePercent; // for LCD output of cell voltage instead of time to full or empty
unsigned long sLastLCDTimePrintMillis; // for LCD output of cell voltage instead of time to full or empty
int16_t sCurrentMilliampere; // to decide if print "time to" values
uint8_t sGlobalI2CReadError;
uint8_t sLastGlobalReadError = 0;
bool sPrintOnlyChanges; // Is set to true after the setup / initial print
uint16_t sLastNoLoadVoltageMillivolt; // to compute ESR
uint8_t sNoLoadVoltageMillivoltNotJustWrittenDelay; // 1 => compute ESR, 0 wait for current to be 0. To compute ESR only once but with 1 measurement delay
/*
* This changes the display behavior to the standalone version.
*/
bool sVCCisLIION = false;
/*
* Value depends on capacity mode
*/
const char TimeToFull_at_rate[] PROGMEM = "TimeToFull at rate";
const char TimeToEmpty_at_rate[] PROGMEM = "TimeToEmpty at rate";
const char Can_be_delivered_for_10_seconds_at_rate[] PROGMEM = "Can be delivered for 10 seconds at rate ";
struct SBMFunctionDescriptionStruct sSBMATRateFunctionDescriptionArray[] = { {
AtRateTimeToFull, TimeToFull_at_rate, &printTime, NULL, 0, 0 }, {
AtRateTimeToEmpty, TimeToEmpty_at_rate, &printTime, NULL, 0, 0 }, {
AtRateOK, Can_be_delivered_for_10_seconds_at_rate, NULL, NULL, 0, 0 } };
const char Charging_Status[] PROGMEM = "Charging Status";
const char Operation_Status[] PROGMEM = "Operation Status";
const char Pack_Voltage[] PROGMEM = "Pack Voltage";
struct SBMFunctionDescriptionStruct sSBMbq20z70FunctionDescriptionArray[] = { {
BQ20Z70_ChargingStatus, Charging_Status, &printHexAndBinary, NULL, 0, 0 }, {
BQ20Z70_OperationStatus, Operation_Status, &printHexAndBinary, NULL, 0, 0 }, {
BQ20Z70_PackVoltage, Pack_Voltage, &printVoltage, NULL, 0, 0 } };
/*
* Helper macro for getting a macro definition as string
*/
#define STR_HELPER(x) #x
#define STR(x) STR_HELPER(x)
/*
* From the specs:
* Its clock frequency range is 10 kHz to 100 kHz.
* The charger must NOT charge a battery when it senses the resistance between the Safety Signal pin and ground to be in the range between 425 and 3150 ohm.
* E.g. NiMH battery may use a 103AT thermistor for this.
* Only Read Word, Write Word, Read Block or Write Block protocol is used.
* bq2084 spec: With SMBus, the most-significant bit (MSB) of a data byte is transmitted first.
* BUT: 16 bit values like DesignVoltage are interpreted as if LSB were sent first.
*/
/*
* Program starts here
*/
void setup() {
pinMode(LED_BUILTIN, OUTPUT);
pinMode(CHARGE_CONTROL_PIN, OUTPUT);
pinMode(DISCHARGE_CONTROL_PIN, OUTPUT);
digitalWrite(CHARGE_CONTROL_PIN, LOW);
digitalWrite(DISCHARGE_CONTROL_PIN, LOW);
pinMode(FORCE_LCD_DISPLAY_TIMING_PIN, INPUT_PULLUP);
Serial.begin(115200);
#if defined(__AVR_ATmega32U4__) || defined(SERIAL_PORT_USBVIRTUAL) || defined(SERIAL_USB) /*stm32duino*/|| defined(USBCON) /*STM32_stm32*/|| defined(SERIALUSB_PID) || defined(ARDUINO_attiny3217)
delay(4000); // To be able to connect Serial monitor after reset or power up and before first print out. Do not wait for an attached Serial Monitor!
#endif
// Just to know which program is running on my Arduino
Serial.println(F("START " __FILE__ "\r\nVersion " VERSION_EXAMPLE " from " __DATE__));
#if defined(DIDR0)
// Disable digital input on all unused ADC channel pins to reduce power consumption
DIDR0 = ADC0D | ADC1D | ADC2D | ADC3D;
#endif
// set up the LCD's number of columns and rows:
myLCD.begin(LCD_COLUMNS, LCD_ROWS); // This also clears display
myLCD.print(F("SBMInfo " VERSION_EXAMPLE " "));
#if defined(__AVR__)
myLCD.print(((float) getVCCVoltageMillivolt()) / 1000, 2);
myLCD.print(F(" V"));
#endif
myLCD.setCursor(0, 1);
myLCD.print(F(__DATE__));
Wire.begin();
Wire.setWireTimeout(); // Sets default timeout of 25 ms.
Wire.setClock(32000); // lowest rate available is 31000
// Wire.setClock(50000); // seen this for sony packs
Serial.println(
F(
"Configured to set charge control pin " STR(CHARGE_CONTROL_PIN) " to low above " STR(CHARGE_SWITCH_OFF_PERCENTAGE) " %"));
Serial.println(
F(
"Configured to set discharge control pin " STR(DISCHARGE_CONTROL_PIN) " to low below " STR(DISCHARGE_SWITCH_OFF_PERCENTAGE) " % or " STR(DISCHARGE_SWITCH_OFF_MILLIVOLT) " mV"));
#if defined(__AVR__)
if (getVCCVoltageMillivolt() < VOLTAGE_USB_LOWER_THRESHOLD_MILLIVOLT || digitalRead(FORCE_LCD_DISPLAY_TIMING_PIN) == LOW) {
sVCCisLIION = true;
} else {
Serial.println(F("No Li-ion supply detected -> fast display timing"));
}
#endif
/*
* Check for I2C device attached.
* Devices which require some time to wakeup, will be found later with scanForAttachedI2CDevice()
*/
if (checkForAttachedI2CDevice(&Serial, SBM_DEVICE_ADDRESS)) {
sI2CDeviceAddress = SBM_DEVICE_ADDRESS;
} else {
Serial.println(F("Start scanning for device at I2C bus"));
Serial.flush();
do {
/*
* Check for I2C device and blink until device attached
* This sets the I2C stop condition for the next commands
*/
int8_t tI2CDeviceAddress = scanForAttachedI2CDevice(&Serial);
/*
* Handle LCD output
*/
if (tI2CDeviceAddress == I2C_SCAN_TIMEOUT) {
myLCD.setCursor(0, 2);
myLCD.print(F("SDA or SCL at ground"));
} else if (tI2CDeviceAddress == I2C_SCAN_NO_DEVICE) {
myLCD.setCursor(0, 2);
myLCD.print("Scan for device ");
char tString[5];
sprintf_P(tString, PSTR("%4u"), sScanCount);
myLCD.print(tString);
} else if (tI2CDeviceAddress >= 0) {
sI2CDeviceAddress = tI2CDeviceAddress;
myLCD.setCursor(0, 2);
myLCD.print(F("Found device at 0x"));
myLCD.print(sI2CDeviceAddress, HEX);
delay(2000);
// clear LCD line
LCDClearLine(2);
break;
}
/*
* If no device found, do voltage and resistance measurement
*/
#if defined(USE_VOLTAGE_AND_RESISTANCE_MEASUREMENT)
MeasureVoltageAndResistance();
#endif
delay(500);
TogglePin(LED_BUILTIN);
} while (true);
}
LCDClearLine(3); // Clear data from MeasureVoltageAndResistance()
// writeWord(MANUFACTURER_ACCESS, 0x0A00); // plus a read. Seen it for old (2005) Dell/Panasonic batteries
printInitialInfo();
sPrintOnlyChanges = true;
digitalWrite(DISCHARGE_CONTROL_PIN, HIGH);
}
const char *sTWIErrorStrings[] = { "OK", "length to long for buffer", "address send, NACK received", "data send, NACK received",
"other error", "timeout" };
void loop() {
// Serial.print(F("sGlobalI2CReadError="));
// Serial.println(sGlobalI2CReadError);
if (sGlobalI2CReadError == 0) {
printFunctionDescriptionArray(sSBMDynamicFunctionDescriptionArray,
(sizeof(sSBMDynamicFunctionDescriptionArray) / sizeof(SBMFunctionDescriptionStruct)));
printSBMNonStandardInfo();
// Here, all values for checking are already read in
checkChargeAndDischargeLimits();
} else {
// Test connection with readWord(). This sets the sGlobalI2CReadError flag accordingly.
readWord(CYCLE_COUNT);
}
/*
* Manage display of sGlobalI2CReadError
*/
if (sLastGlobalReadError != sGlobalI2CReadError) {
Serial.print(F("\r\nI2C read error changed from "));
Serial.print(sTWIErrorStrings[sLastGlobalReadError]);
Serial.print('|');
Serial.print(sLastGlobalReadError);
Serial.print(F(" to "));
Serial.print(sTWIErrorStrings[sGlobalI2CReadError]);
Serial.print('|');
Serial.println(sGlobalI2CReadError);
Serial.flush();
sLastGlobalReadError = sGlobalI2CReadError;
if (sGlobalI2CReadError == 0) {
// clear the display of 'H' for sGlobalI2CReadError
myLCD.setCursor(19, 0);
myLCD.print(' ');
// print info again
printInitialInfo();
sPrintOnlyChanges = true;
} else {
// display 'H' for sGlobalI2CReadError
myLCD.setCursor(19, 0);
myLCD.print('H');
}
}
delay(MILLIS_BETWEEN_READING_FOR_CHANGED_VALUES);
TogglePin(LED_BUILTIN);
}
void TogglePin(uint8_t aPinNr) {
if (digitalRead(aPinNr) == HIGH) {
digitalWrite(aPinNr, LOW);
} else {
digitalWrite(aPinNr, HIGH);
}
}
/*
* Uses LCD Line 2 for display
*/
uint8_t scanForAttachedI2CDevice(void) {
static unsigned int sScanCount = 0;
// the next 2 statements disable TWI hangup, if SDA and SCL are connected and disconnected from ground.
#if defined(TWCR)
TWCR = 0;
#endif
Wire.begin();
auto tStartMillis = millis();
int tFoundAdress = SBM_INVALID_ADDRESS;
// We cannot use uint_fast8_t here, since it is ambiguous parameter for beginTransmission() on 16/32 bit CPU
for (uint8_t tI2CAddress = 0; tI2CAddress < 127; tI2CAddress++) {
Wire.beginTransmission(tI2CAddress);
uint8_t tOK = Wire.endTransmission(true);
if (tOK == 0) {
Serial.print(F("Found I2C device attached at address: "));
printlnHex(tI2CAddress);
tFoundAdress = tI2CAddress;
}
}
if (millis() - tStartMillis > 2000) {
Serial.print(F("I2C Scan timeout. It seems that at least one of SCA or SCL is connected to ground."));
myLCD.setCursor(0, 2);
myLCD.print(F("SDA or SCL at ground"));
tFoundAdress = SBM_INVALID_ADDRESS;
} else if (tFoundAdress == SBM_INVALID_ADDRESS) {
Serial.print(F("Scan found no attached I2C device - "));
Serial.println(sScanCount);
myLCD.setCursor(0, 2);
myLCD.print("Scan for device ");
char tString[5];
sprintf_P(tString, PSTR("%4u"), sScanCount);
myLCD.print(tString);
sScanCount++;
} else {
myLCD.setCursor(0, 2);
myLCD.print(F("Found device at 0x"));
myLCD.print(tFoundAdress, HEX);
delay(2000);
// clear LCD line
LCDClearLine(2);
}
return tFoundAdress;
}
void printInitialInfo() {
sPrintOnlyChanges = false;
/*
* The workaround to set __FILE__ with #line __LINE__ "LightToServo.cpp" disables source output including in .lss file (-S option)
*/
Serial.println(F("\r\n*** STATIC INFO ***"));
/*
* First read battery mode to set the sCapacityModePower flag to display the static values with the right unit
*/
readWordAndPrint(&sBatteryModeFuctionDescription);
checkForSBMNonStandardInfoSupported(); // result affects the LCD row of capacity
Serial.flush(); // in order not to interfere with i2c timing
printSBMStaticInfo();
Serial.println(F("\r\n*** MANUFACTURER INFO ***"));
Serial.flush();
printSBMManufacturerInfo();
Serial.println(F("\r\n*** RATE TEST INFO ***"));
Serial.flush();
printSBMATRateInfo();
Serial.println(F("\r\n*** DYNAMIC INFO ***"));
Serial.flush();
printFunctionDescriptionArray(sSBMDynamicFunctionDescriptionArray,
(sizeof(sSBMDynamicFunctionDescriptionArray) / sizeof(SBMFunctionDescriptionStruct)));
Serial.println(F("\r\n*** DYNAMIC NON STANDARD INFO / Cell Voltages + SOH ***"));
Serial.flush();
printSBMNonStandardInfo();
Serial.println(F("\r\n*** CHANGED VALUES ***"));
Serial.flush();
}
void writeCommandWithRetry(uint8_t aCommand) {
Wire.beginTransmission(sI2CDeviceAddress);
Wire.write(aCommand);
sGlobalI2CReadError = Wire.endTransmission(false); // do not send stop, is required for some packs
/*
* Output 0 .. success
* 1 .. length to long for buffer
* 2 .. address send, NACK received
* 3 .. data send, NACK received
* 4 .. other twi error (lost bus arbitration, bus error, ..)
* 5 .. timeout
*/
if (sGlobalI2CReadError == 2) {
delay(I2C_RETRY_DELAY_MILLIS);
// Try again
Wire.beginTransmission(sI2CDeviceAddress);
Wire.write(aCommand);
sGlobalI2CReadError = Wire.endTransmission(false); // do not send stop, is required for some packs
}
#if defined(DEBUG)
if(sGlobalI2CReadError) {
Serial.print(F("sGlobalI2CReadError="));
Serial.print(sGlobalI2CReadError);
Serial.print(F(" Command=0x"));
Serial.println(aCommand,HEX);
}
#endif
}
/*
* First write the command/function address byte, then read the word value for this function
* From the BQ spec: The processor then sends the bq2060 device address of 0001011 (bits 7–1)
* plus a R/W bit (bit 0) followed by an SMBus command code.
*/
uint16_t readWord(uint8_t aCommand) {
writeCommandWithRetry(aCommand);
if (sGlobalI2CReadError != 0) {
#if defined(DEBUG)
Serial.print(F("Error at I2C access "));
Serial.println(sGlobalI2CReadError);
#endif
return 0xFFFF;
} else {
Wire.requestFrom(sI2CDeviceAddress, (uint8_t) 2);
uint8_t tLSB = Wire.read();
uint8_t tMSB = Wire.read();
return (int) tLSB | (((int) tMSB) << 8);
}
}
/*
* Write the command/function address byte and the word value for this function LSB first, because the BQ reads and send LSByte first!
*/
void writeWord(uint8_t aCommand, uint16_t aValue) {
Wire.beginTransmission(sI2CDeviceAddress);
Wire.write((aValue >> 8) & 0xFF);
Wire.write(aCommand);
Wire.write(aValue & 0xFF);
Wire.endTransmission();
}
/*
* Write manufacturer command to manufacturer access function/register and read the result for that manufacturer command
*/
int readWordFromManufacturerAccess(uint16_t aManufacturerCommand) {
writeWord(MANUFACTURER_ACCESS, aManufacturerCommand);
return readWord(MANUFACTURER_ACCESS);
}
uint8_t readBlock(uint8_t aCommand, uint8_t *aDataBufferPtr, uint8_t aDataBufferLength) {
writeCommandWithRetry(aCommand);
Wire.requestFrom(sI2CDeviceAddress, (uint8_t) 1);
// First read length of data
uint8_t tLengthOfData = Wire.read();
#if defined(DEBUG)
Serial.println();
Serial.print(F("tLengthOfData="));
Serial.println(tLengthOfData);
#endif
aDataBufferLength = aDataBufferLength - 1; // we read later with tLengthOfData + 1
if (tLengthOfData > aDataBufferLength) {
Serial.println();
Serial.print(F("Error: received invalid block length of "));
Serial.print(tLengthOfData);
Serial.print(F(" -> try "));
Serial.println(aDataBufferLength);
tLengthOfData = aDataBufferLength;
}
if (tLengthOfData > 0) {
/*
* It is foolproof to start a new transmission here
*/
writeCommandWithRetry(aCommand);
#if defined(DEBUG)
uint8_t tNumberOfDataReceived = Wire.requestFrom(sI2CDeviceAddress, (uint8_t) (tLengthOfData + 1)); // +1 since the length is read again
Serial.print(F("tNumberOfDataReceived="));
Serial.println(tNumberOfDataReceived);
Serial.flush();// required to see complete output in case of crash
#else
// request maximum aDataBufferLength + 1 (for length) bytes from device
Wire.requestFrom(sI2CDeviceAddress, (uint8_t) (tLengthOfData + 1)); // +1 since the length is read again
#endif
Wire.read(); // read length byte
Wire.readBytes(aDataBufferPtr, tLengthOfData); // read at maximum aDataBufferLength bytes
}
return tLengthOfData;
}
void prettyPrintDescription(const __FlashStringHelper *aDescription) {
Serial.print(aDescription);
uint8_t tStringLength = strlen_P((const char*) aDescription);
Serial.print(' '); // print at least one space
for (int8_t i = 0; i < PRINT_VALUE_START_COLUMN - (tStringLength + 1); ++i) {
Serial.print(' ');
}
}
void prettyPrintlnValueDescription(const __FlashStringHelper *aValueDescription) {
prettyPrintDescription(F(""));
Serial.print(aValueDescription);
Serial.println();
}
void prettyPrintDescription(const char *aDescription) {
prettyPrintDescription((const __FlashStringHelper*) aDescription);
}
//
//void printPaddingForStartColumn() {
// for (int8_t i = 0; i < PRINT_VALUE_START_COLUMN; ++i) {
// Serial.print(' ');
// }
//}
void printValue(struct SBMFunctionDescriptionStruct *aSBMFunctionDescription, uint16_t tCurrentValue) {
// print always 0 value
if (!sPrintOnlyChanges || (tCurrentValue == 0 && aSBMFunctionDescription->lastPrintedValue != 0)
|| (abs(tCurrentValue - aSBMFunctionDescription->lastPrintedValue) > aSBMFunctionDescription->minDeltaValueToPrint)) {
aSBMFunctionDescription->lastPrintedValue = tCurrentValue;
prettyPrintDescription(aSBMFunctionDescription->Description);
if (aSBMFunctionDescription->ValueFormatter == NULL) {
/*
* Default formatting, print decimal and hex value
*/
Serial.print(tCurrentValue);
Serial.print(F(" | 0x"));
Serial.print(tCurrentValue, HEX);
} else {
aSBMFunctionDescription->ValueFormatter(aSBMFunctionDescription, tCurrentValue);
}
// print Hex value if value is not really plausible. We may get negative values here!
if ((tCurrentValue & 0xFF) == 0xFF) {
Serial.print(F(" - received 0x"));
Serial.print(tCurrentValue, HEX);
}
Serial.println();
Serial.flush();
}
}
/*
* Read word and print if value has changed.
* To avoid spurious outputs check changed values 3 times.
*/
void readWordAndPrint(struct SBMFunctionDescriptionStruct *aSBMFunctionDescription) {
uint16_t tCurrentValue = readWord(aSBMFunctionDescription->FunctionCode);
if (sGlobalI2CReadError == 0) {
printValue(aSBMFunctionDescription, tCurrentValue);
}
// if (sGlobalI2CReadError == 0) {
// if (sPrintOnlyChanges) {
// if (tCurrentValue != aSBMFunctionDescription->lastPrintedValue) {
// // check value again, maybe it was a transmit error
// delay(33); // just guessed the value of 33
// uint16_t tCurrentValue2 = readWord(aSBMFunctionDescription->FunctionCode);
// if (tCurrentValue2 != aSBMFunctionDescription->lastPrintedValue) {
// delay(17); // just guessed the value
// uint16_t tCurrentValue3 = readWord(aSBMFunctionDescription->FunctionCode);
// if (tCurrentValue3 != aSBMFunctionDescription->lastPrintedValue) {
// printValue(aSBMFunctionDescription, tCurrentValue);
// }
// }
// }
//
// } else {
// printValue(aSBMFunctionDescription, tCurrentValue);
// }
// }
}
void printByteHex(uint16_t aValue) {
Serial.print(F("0x"));
Serial.print(aValue, HEX);
}
void printlnHex(uint16_t aValue) {
printByteHex(aValue);
Serial.println();
}
void printHexAndBinary(struct SBMFunctionDescriptionStruct *aSBMFunctionDescription __attribute__((unused)), uint16_t aValue) {
printByteHex(aValue);
Serial.print(" | 0b");
Serial.print(aValue, BIN);
}
void printCycleCount(struct SBMFunctionDescriptionStruct *aSBMFunctionDescription, uint16_t aValue) {
Serial.println((int) aValue);
if (aSBMFunctionDescription->DescriptionLCD != NULL) {
myLCD.setCursor(11, 2);
myLCD.print(aValue);
myLCD.print(aSBMFunctionDescription->DescriptionLCD);
}
}
void printPercentage(struct SBMFunctionDescriptionStruct *aSBMFunctionDescription, uint16_t aPercentage) {
(void) aSBMFunctionDescription;
Serial.print(aPercentage);
Serial.print('%');
}
void printRelativeCharge(struct SBMFunctionDescriptionStruct *aSBMFunctionDescription, uint16_t aPercentage) {
sRelativeChargePercent = aPercentage;
printPercentage(aSBMFunctionDescription, aPercentage);
}
/*
* Handles the charge and discharge pin
* Requires preceding call to printRelativeCharge() by call to printFunctionDescriptionArray(sSBMDynamicFunctionDescriptionArray,...)
*/
void checkChargeAndDischargeLimits() {
if (sRelativeChargePercent > CHARGE_SWITCH_OFF_PERCENTAGE) {
digitalWrite(CHARGE_CONTROL_PIN, LOW);
} else {
digitalWrite(CHARGE_CONTROL_PIN, HIGH);
}
if (sRelativeChargePercent < DISCHARGE_SWITCH_OFF_PERCENTAGE) {
digitalWrite(DISCHARGE_CONTROL_PIN, LOW);
} else if (!sCellVoltageIsBelowSwitchOffThreshold) {
digitalWrite(DISCHARGE_CONTROL_PIN, HIGH);
}
}
const char* getCapacityModeUnit() {
if (sCapacityModePower) {
return StringCapacityModePower;
}
return StringCapacityModeCurrent;
}
/*
* Prints only mAh on LCD
* "28% 4400 -> 1247 mAh" on row 1 or 2 depending on sNonStandardInfoSupportedByPack
*
* @param aCapacity as mAh or if sCapacityModePower == true, then as mWh
* !!! Sets sDesignCapacityMilliAmpereHour and sDesignCapacity if called for DESIGN_CAPACITY
*/
void printCapacity(struct SBMFunctionDescriptionStruct *aSBMFunctionDescription, uint16_t aCapacity) {
/*
* Print mWh and mAh
*/
Serial.print(aCapacity);
Serial.print(getCapacityModeUnit());
Serial.print('h');
uint16_t tCapacityMilliAmpereHour = aCapacity;
if (sCapacityModePower) {
// print also mA since changing capacity mode did not work
Serial.print(" | ");
tCapacityMilliAmpereHour = (aCapacity * 10000L) / sDesignVoltageMillivolt;
Serial.print(tCapacityMilliAmpereHour);
Serial.print(StringCapacityModeCurrent);
Serial.print('h');
}
/*
* Now print capacity only as mAh, not as mWh
*/
if (aSBMFunctionDescription->FunctionCode == FULL_CHARGE_CAPACITY) {
/*
* print design capacity -> full charge capacity and percent of design capacity
*/
if (sNonStandardInfoSupportedByPack != NON_STANDARD_INFO_SUPPORTED) {
myLCD.setCursor(0, FULL_CHARGE_CAPACITY_LCD_ROW_NON_STANDARD_NOT_SUPPORTED);
} else {
myLCD.setCursor(0, FULL_CHARGE_CAPACITY_LCD_ROW_NON_STANDARD_SUPPORTED);
}
// "28% 4400 -> 1247 mAh" on row 1 or 2 depending on sNonStandardInfoSupportedByPack
uint8_t tPercent = (aCapacity * 100L) / sDesignCapacity;
myLCD.print(tPercent);
myLCD.print("% ");
myLCD.print(sDesignCapacityMilliAmpereHour);
myLCD.print(" -> ");
// if (tPercent < 100) {
// myLCD.print(' ');
// }
myLCD.print(tCapacityMilliAmpereHour);
myLCD.print(StringCapacityModeCurrent);
myLCD.print('h');
Serial.print(" = ");
Serial.print(tPercent);
Serial.print('%');
}
else if (aSBMFunctionDescription->DescriptionLCD != NULL) {
/*
* Only called here with DESIGN_CAPACITY or REMAINING_CAPACITY
* "0 mAh 0% remCap " on row 3
* "4400 mAh " on row 3 for first page
*/
// always print as mAh with trailing space
if (aSBMFunctionDescription->FunctionCode == REMAINING_CAPACITY) {
myLCD.setCursor(0, REMAINING_CAPACITY_LCD_ROW);
} else {
sDesignCapacityMilliAmpereHour = tCapacityMilliAmpereHour;
sDesignCapacity = aCapacity;
myLCD.setCursor(11, DESIGN_CAPACITY_LCD_ROW);
}
uint8_t tCharacterPrinted = 0;
tCharacterPrinted += myLCD.print(tCapacityMilliAmpereHour);
tCharacterPrinted += myLCD.print(StringCapacityModeCurrent) + 1;
myLCD.print('h');
if (aSBMFunctionDescription->FunctionCode == REMAINING_CAPACITY) {
myLCD.print(' ');
tCharacterPrinted += myLCD.print(sRelativeChargePercent) + 2;
myLCD.print('%');
Serial.print(" = ");
Serial.print(sRelativeChargePercent);
Serial.print('%');
}
tCharacterPrinted += myLCD.print(aSBMFunctionDescription->DescriptionLCD);
if (aSBMFunctionDescription->FunctionCode == REMAINING_CAPACITY) {
// clear rest of line
LCDPrintSpaces(LCD_COLUMNS - tCharacterPrinted);
}
}
}
void printVoltage(struct SBMFunctionDescriptionStruct *aSBMFunctionDescription, uint16_t aVoltageMillivolt) {
Serial.print((float) aVoltageMillivolt / 1000, 3);
Serial.print(" V");
if (aSBMFunctionDescription->DescriptionLCD != NULL) {
if (aSBMFunctionDescription->FunctionCode == DESIGN_VOLTAGE) {
// store for global use
sDesignVoltageMillivolt = aVoltageMillivolt;
myLCD.setCursor(0, DESIGN_VOLTAGE_LCD_ROW);
} else /*if (aSBMFunctionDescription->FunctionCode == VOLTAGE)*/{
// // Print 8 spaces from 0 to 7
// myLCD.setCursor(0, 0);
// LCDPrintSpaces(9); // clear old value from 0 to 8 incl. trailing space
if (sCurrentMilliampere == 0) {
sLastNoLoadVoltageMillivolt = aVoltageMillivolt;
sNoLoadVoltageMillivoltNotJustWrittenDelay = 3;
} else {
// do not count below 0
if (sNoLoadVoltageMillivoltNotJustWrittenDelay != 0) {
sNoLoadVoltageMillivoltNotJustWrittenDelay--;
}