CCS/BQ76PL536A-Q1: BQ76PL536A-Q1

// include the library code:
#include <SPI.h>
#include <Wire.h>
#include <math.h>
#include <LiquidCrystal.h>

//Declared Variables
SPISettings settingsA(3000000, MSBFIRST, SPI_MODE1);
const byte Fault_H = 8; //Fault indication pin from bq76
const byte Alert_H = 7; //Alert indication pin from bq76
const byte DRDY_H = 6; //Data ready indication from bq76
const byte CONV_H = 5; //Conversion start pin for bq76
const byte Charge_Mode = 4; //Charger status to indicate if charging mode is active
const byte Charge_Relay = 3; //Output to toggle charger on or off
const byte slaveSelectPin = 10; //SPI slave select
const byte LED = 9; //LED indicator

const byte n_dev = 1; //Expected number of devices in stack
const byte COV = 0x2B; //Cell overvoltage (4.15V). 0x00 = 2V, bit increments increase set point by 50mV.
const byte CUV = 0x12; //Cell undervoltage (2.5V). 0x00 =0.7V, bit increments increase set point by 100mV.
const int OV = 4150; //Set point for Cell balancing
const byte FC = 0x20; //Set ratiometric mode for GPAI_REF

byte w_data[3]; //Write packet
byte r_header[3]; //Read packet header
byte r_header2[3]; //Alternate read packet header
byte drdy; //Data ready
byte CRC; //CRC

byte read_byte; //Shifted byte to read
byte write_byte; //Shifted byte to write
byte RegValue; //Value read from register
byte dev_fault; //Fault Code of current device
byte dev_alert; //Alert Code of current device


byte cell_now = 0x03; //Current selected cell reg address, must increment by 2. 0x03 to 0x0E
byte cell_num = 1; //Current selected cell number

byte alert_now = 7; //Alert bit status to be displayed
byte fault_now = 7; //Fault bit status to be displayed


byte v_msb; //MSB of volt measurement
byte v_lsb; //LSB of volt measurement
 
float volts; 
int cellno=1;

int CB_Timer; //Count for number of CB Timers active




//Functions:
void read_header(byte r_header[]);
byte read_data();
byte read_CRC();
void write_reg(byte w_data[]);
byte function_CRC(byte data[]);
void reset_all();


void auto_addr(int n_dev);
byte read_shift(byte d_addr);
byte write_shift(byte d_addr);
void batt_init(byte COV, byte CUV, byte OT, byte FC);
void conv(byte adc_ctrl[]);
int volt_calc(byte v_msb, byte v_lsb);


//CRC LUT:
byte CrcTable[] = {
0x00, 0x07, 0x0E, 0x09, 0x1C, 0x1B, 0x12, 0x15,
0x38, 0x3F, 0x36, 0x31, 0x24, 0x23, 0x2A, 0x2D,
0x70, 0x77, 0x7E, 0x79, 0x6C, 0x6B, 0x62, 0x65,
0x48, 0x4F, 0x46, 0x41, 0x54, 0x53, 0x5A, 0x5D,
0xE0, 0xE7, 0xEE, 0xE9, 0xFC, 0xFB, 0xF2, 0xF5,
0xD8, 0xDF, 0xD6, 0xD1, 0xC4, 0xC3, 0xCA, 0xCD,
0x90, 0x97, 0x9E, 0x99, 0x8C, 0x8B, 0x82, 0x85,
0xA8, 0xAF, 0xA6, 0xA1, 0xB4, 0xB3, 0xBA, 0xBD,
0xC7, 0xC0, 0xC9, 0xCE, 0xDB, 0xDC, 0xD5, 0xD2,
0xFF, 0xF8, 0xF1, 0xF6, 0xE3, 0xE4, 0xED, 0xEA,
0xB7, 0xB0, 0xB9, 0xBE, 0xAB, 0xAC, 0xA5, 0xA2,
0x8F, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9D, 0x9A,
0x27, 0x20, 0x29, 0x2E, 0x3B, 0x3C, 0x35, 0x32,
0x1F, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0D, 0x0A,
0x57, 0x50, 0x59, 0x5E, 0x4B, 0x4C, 0x45, 0x42,
0x6F, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7D, 0x7A,
0x89, 0x8E, 0x87, 0x80, 0x95, 0x92, 0x9B, 0x9C,
0xB1, 0xB6, 0xBF, 0xB8, 0xAD, 0xAA, 0xA3, 0xA4,
0xF9, 0xFE, 0xF7, 0xF0, 0xE5, 0xE2, 0xEB, 0xEC,
0xC1, 0xC6, 0xCF, 0xC8, 0xDD, 0xDA, 0xD3, 0xD4,
0x69, 0x6E, 0x67, 0x60, 0x75, 0x72, 0x7B, 0x7C,
0x51, 0x56, 0x5F, 0x58, 0x4D, 0x4A, 0x43, 0x44,
0x19, 0x1E, 0x17, 0x10, 0x05, 0x02, 0x0B, 0x0C,
0x21, 0x26, 0x2F, 0x28, 0x3D, 0x3A, 0x33, 0x34,
0x4E, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5C, 0x5B,
0x76, 0x71, 0x78, 0x7F, 0x6A, 0x6D, 0x64, 0x63,
0x3E, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2C, 0x2B,
0x06, 0x01, 0x08, 0x0F, 0x1A, 0x1D, 0x14, 0x13,
0xAE, 0xA9, 0xA0, 0xA7, 0xB2, 0xB5, 0xBC, 0xBB,
0x96, 0x91, 0x98, 0x9F, 0x8A, 0x8D, 0x84, 0x83,
0xDE, 0xD9, 0xD0, 0xD7, 0xC2, 0xC5, 0xCC, 0xCB,
0xE6, 0xE1, 0xE8, 0xEF, 0xFA, 0xFD, 0xF4, 0xF3
};

void setup() {
  //MCU Initialization START
pinMode(Fault_H, INPUT); // Fault_H
pinMode(Alert_H, INPUT); // Alert_H
pinMode(DRDY_H, INPUT); // DRDY_H (Data Ready)
pinMode(CONV_H, OUTPUT); // CONV_H (Conversion)
pinMode(Charge_Mode, INPUT); // Input to determine if in charging mode
pinMode(Charge_Relay, OUTPUT); // Output to turn charger on or off
//MCU Initialization END
digitalWrite(CONV_H, LOW);
Serial.begin(9600); // Debugging output
//lcd.begin(16, 2);

//SPI Initialization START
pinMode(slaveSelectPin, OUTPUT); //set the slaveSelectPin as an output
digitalWrite(slaveSelectPin, HIGH); //Set CS_H HIGH
SPI.begin(); //Initializes SPI bus
//SPI Initialization END

//bq76 Automatic Device Addressing START
auto_addr(n_dev);
//bq76 Automatic Device Addressing END

//Serial.println("start");
//Battery Initialization START
//batt_init(COV,CUV,FC);
//Battery Initialization END

//Clear POR Fault START
byte por_clear[] = {0x7F, 0x21, 0x08};
write_reg(por_clear);
por_clear[2] = 0x00;
write_reg(por_clear);
//Clear POR Fault END

//Clear Address Alert START
byte ar_clear[] = {0x7F, 0x20, 0x80};
write_reg(ar_clear);
ar_clear[2] = 0x00;
write_reg(ar_clear);
//Clear Address Alert END
//Serial.println("start");
}

void loop() {
  // put your main code here, to run repeatedly:

byte w_wake[] = {0x7F, 0x31, 0x00};
write_reg(w_wake);
delay (1); //Wait to stabilize the reference voltage
Serial.println("ZZZZZZZZZZZZ");
w_wake[0] = 0x7f;
w_wake[1] = 0x20;
w_wake[2] = 0x04;   //means sleep mode was activated 
write_reg(w_wake); 
w_wake[2] = 0x00;   //Clear Sleep alert by writning this to device.
write_reg(w_wake);
Serial.println("YYYYYYYYY");
byte adc_ctrl[] = {0x7F, 0x30, 0x05}; //ADC_Ctrl to readall voltages and temps   binary  00110101  for zeon it should be 00000101
conv(adc_ctrl); //Start conversion  
drdy = digitalRead(DRDY_H);
Serial.println("TTTTTTTTTTT");
while (drdy == 0)
{//Wait for conversion process to finish.
drdy = digitalRead(DRDY_H);
Serial.println(drdy);

Serial.println("XXXXXXXXXXX");
for (int i = 1; i<n_dev+1; i++) 
{ 
  //cycle through each device
 
for (byte j=0x03;j<=0x0E;j+0x02) 
{ 
  //cycle through each cell
read_byte = read_shift(n_dev);
Serial.print("read_byte");
Serial.println(read_byte);
byte r_header[] = {read_byte, j, 0x01};      //read from msb of volts for current cell of current device
read_header(r_header);
v_msb = read_data();
CRC = read_CRC();
Serial.print("crc_msb");
Serial.println(CRC);
Serial.print("v_msb=");
Serial.println(v_msb);
byte r_header2[] = {read_byte, j+1, 0x01}; //read from lsb of volts for current cell of current device
read_header(r_header2);
v_lsb = read_data();
CRC = read_CRC();
volts= volt_calc(v_msb, v_lsb); //Calculate voltage in mV
Serial.print("v_Lsb=");
Serial.println(v_lsb);
Serial.print(j);
Serial.print("zz=");
Serial.println(volts);
delay(5000);
  //int Zvoltage[i][cellno];
  //Zvoltage[i][cellno]= volts;
  //Serial.println(Zvoltage[i][cellno]);
  //cellno++;
}

Serial.println("finish");
//cellno=1; 
}
}
}

//Function to establish device address, register address, and length for reading

void read_header(byte r_header[]) {
digitalWrite(slaveSelectPin, LOW); //Set CS_H LOW to start packet transfer
SPI.beginTransaction(settingsA);
for (int i = 0; i <=3; i++)
{
SPI.transfer(r_header[i]); //Set device address, read, register address, & length
}
}


// Shift device address left 1 bit
byte read_shift(byte d_addr)
{
byte read_byte = (d_addr << 1);
return read_byte;
}



//Function to clock in a read cycle and return the read data
byte read_data() {
byte RegValue;
RegValue = SPI.transfer(0x00);
return RegValue;
}

//Function to clock in a CRC cycle and return CRC value
byte read_CRC() {
byte CRC;
CRC = SPI.transfer(0x00);
SPI.endTransaction();
digitalWrite(slaveSelectPin, HIGH); //Set CS_H HIGH to end packet transfer
return CRC;
}


//Function to write to bq71
void write_reg(byte w_data[])
{
CRC = function_CRC(w_data);
digitalWrite(slaveSelectPin, LOW); //Set CS_H LOW to start packet transfer
SPI.beginTransaction(settingsA);
for (int i = 0; i <=3; i++)
{
SPI.transfer(w_data[i]); //Set device address, write, register address, & write data
}
SPI.transfer(CRC); // CRC Code
SPI.endTransaction();
digitalWrite(slaveSelectPin, HIGH); //Set CS_H HIGH to end packet transfer
}

//Function to generate a CRC
byte function_CRC(byte data[])
{
byte crc = 0;
int temp = 0;
for (int i = 0; i < sizeof(data); i++)
{
temp = crc ^ data[i];
crc = CrcTable[temp];
}
return crc;
}


//Broadcast RESET to all devices
void reset_all()
{
byte w_data[3] = {0x7F, 0x3C, 0xA5};
write_reg(w_data);
}


//Automatically address all devices in stack
void auto_addr(byte n_dev)
{
byte device_search = 0;
point1: reset_all();
device_search++;
byte n = 0;
point2: n++;
byte w_data[3] = {0x00, 0x3B, n}; //header for write address n to dev[0]
write_reg(w_data);
read_byte = read_shift(n);
byte r_header[3] = {read_byte, 0x3B, 0x01}; //header to read address from address_ctrl register
read_header(r_header);
RegValue = read_data();
CRC = read_CRC();
Serial.println(RegValue);
RegValue = RegValue/128;
//RegValue = RegValue;
while (RegValue != n) { //Device will be stuck in this loop if addressing fails. Requires POR to try again. Device addr critical.
//lcd.setCursor(0, 0);
Serial.println("Addr Failed on Device");
Serial.println(n);
byte por_clear[] = {0x7F, 0x21, 0x08};
write_reg(por_clear);
por_clear[2] = 0x00;
write_reg(por_clear);
//lcd.print("Addr Failed on D");
//lcd.setCursor(0, 1);
//lcd.print(n);
}
if (n < device_search) {
goto point2;
}
if (n < n_dev) {
goto point1;
}
if (n != n_dev) {
Serial.println("Address Failed 2");  

//lcd.setCursor(0, 0);
//lcd.print("Automatic Device");
//lcd.setCursor(0, 1);
//lcd.print("Address Failed 2");
}
if(n==n_dev)
{ Serial.println("adresing succesful");  }
}

// Shift device address left 1 bit then add 1 to indicate write
byte write_shift(byte d_addr)
{
byte write_byte = (d_addr << 1) + 1;
return write_byte;
}


//Overwrite EPROM values using shadow control special sequence. Write 0x35 to shdw_ctrl reg followed by set point.
void batt_init(byte COV, byte CUV, byte FC)
{
byte shdw_ctrl[3] = {0x7F, 0x3A, 0x35};
//Set Special feature config:
write_reg(shdw_ctrl);
byte w_func_con[] = {0x7F, 0x40, FC};
write_reg(w_func_con);
//Set Overvoltage:
write_reg(shdw_ctrl);
byte w_COV[3] = {0x7F, 0x42, COV};
write_reg(w_COV);
//Set Undervoltage:
write_reg(shdw_ctrl);
byte w_CUV[3] = {0x7F, 0x44, CUV};
write_reg(w_CUV);
}


//Function to assert a conversion process
void conv(byte adc_ctrl[])
{
byte conv_start[] = {0x7F, 0x34, 0x01};
write_reg(adc_ctrl); //Sets ADC control register with desired parameters
delay(50);
write_reg(conv_start); //Start conversion
delay(50);
}


//Function to calculate voltage using register values
int volt_calc(byte v_msb, byte v_lsb)
{ 
float ratio = 0.381493;
int mV = ((v_msb * 0x100) + v_lsb) * ratio;
return mV;
}