I`m developing 2 BQ76PL536A to manage 5 cells each. In order to communicate with the boards I`m using an Arduino Uno. That`s the code I`m using:
#include <SPI.h>
#include <Wire.h>
//
// teste com dois cartoes
//
const byte crcTable[256] = {
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
};
#define DEVICE_STATUS 0x00
#define GPAI 0x01
#define VCELL1 0x03
#define VCELL2 0x05
#define VCELL3 0x07
#define VCELL4 0x09
#define VCELL5 0x0B
#define VCELL6 0x0D
#define TEMPERATURE1 0x0F
#define TEMPERATURE2 0x11
#define ALERT_STATUS 0x20
#define FAULT_STATUS 0x21
#define COV_FAULT 0x22
#define CUV_FAULT 0x23
#define PRESULT_A 0x24
#define PRESULT_B 0x25
#define ADC_CONTROL 0x30
#define IO_CONTROL 0x31
#define CB_CTRL 0x32
#define CB_TIME 0x33
#define ADC_CONVERT 0x34
#define SHDW_CTRL 0x3A
#define ADDRESS_CONTROL 0x3B
#define RESET 0x3C
#define TEST_SELECT 0x3D
#define E_EN 0x3F
#define FUNCTION_CONFIG 0x40
#define IO_CONFIG 0x41
#define ALERT_PIN 3
#define FAULT_PIN 4
#define CONV_PIN 5
#define DRDY_PIN 6
#define SLAVE_SELECT_PIN 10
#define MOSI 11
#define MISO 12
#define DISCOVERY_ADDR 0x00
#define BROADCAST 0x3F
#define ADDRESS_MAP 0x3F
#define AC_ADDR_RQST 0x80
#define RESET_COMMAND 0xA5
#define dev1 1
#define dev2 2
static int devices_used = 2;
void setup();
void loop();
void setup() {
// Delay for programming
delay(2000);
pinMode (SLAVE_SELECT_PIN, OUTPUT);
pinMode(FAULT_PIN, INPUT);
pinMode(ALERT_PIN, INPUT);
pinMode(DRDY_PIN, INPUT);
pinMode(CONV_PIN, OUTPUT);
// Write initial pin states
digitalWrite(CONV_PIN, LOW);
digitalWrite(SLAVE_SELECT_PIN, HIGH);
// Begin serial communication for serial debug
Serial.begin(57600);
delay(100);
// Set SPI preferences
SPI.begin();
SPI.setClockDivider(SPI_CLOCK_DIV32);
SPI.setBitOrder(MSBFIRST);
// Connect to BMS shield
setupDevices();
}
void loop() {
delay(1000);
}
void setupDevices()
{
int num_dev;
num_dev=setAddresses();
if (num_dev == devices_used)
{ Serial.print("Found all "); Serial.print(num_dev);
Serial.println(" devices.");
}
else
Serial.println("Error finding devices...");
}
int setAddresses() {
byte look_for=0;
byte n;
byte temp;
byte* verify;
int mystatus;
Serial.println("Initializing devices.");
do
{
bqWrite(BROADCAST, RESET, RESET_COMMAND);
look_for++;
n=0;
do
{
n++;
bqWrite(DISCOVERY_ADDR, ADDRESS_CONTROL, n);
*verify=bqRead(n, ADDRESS_CONTROL, 1);
// Verifying if bit 7 of ADDRESS_CONTROL is set properly
temp= (*verify) & AC_ADDR_RQST;
if ( temp != 0)
{ Serial.print("Bit 7 ADRRESS_CONTROL set OK="); Serial.println(temp);
Serial.print("Addrres="); Serial.println(*verify & ADDRESS_MAP);
}
else
{ Serial.println("ERROR: Bit 7 (ADRRESS_CONTROL) NOT set.");
Serial.print("Verify="); Serial.println(*verify);
Serial.print("Address Stored="); Serial.println(*verify & ADDRESS_MAP);
return n-1;
}
} while ( n < look_for);
} while ( n < devices_used);
return n;
}
void bqWrite(byte deviceAddress, byte regAddress, byte regData) {
SPI.setDataMode(SPI_MODE1);
// Shift the device bit and set bit 0
byte logicalAddress = deviceAddress << 1;
logicalAddress |= 1 << 0; // Set bit 0, test bitSet(x,n)
byte crcInput[3] = {
logicalAddress, regAddress, regData
};
// Take the SS pin low to select the chip
digitalWrite(SLAVE_SELECT_PIN, LOW);
// Send and receive SPI
SPI.transfer(logicalAddress);
SPI.transfer(regAddress);
SPI.transfer(regData);
SPI.transfer(pec(crcInput));
// Take the SS pin high to de-select the chip
digitalWrite(SLAVE_SELECT_PIN, HIGH);
SPI.setDataMode(SPI_MODE0);
}
byte *bqRead(byte deviceAddress, byte regAddress, byte length) {
SPI.setDataMode(SPI_MODE1);
// Shift the device bit and clear bit 0
byte logicalAddress = deviceAddress << 1;
logicalAddress &= ~(1 << 0); // Clear bit 0, test bitClear(x,n)
// Create buffer for receivedData and clear it
static byte receivedData[20];
memset(receivedData, 0, sizeof(receivedData));
// take the SS pin low to select the chip:
digitalWrite(SLAVE_SELECT_PIN, LOW);
// Send and receive SPI
SPI.transfer(logicalAddress);
SPI.transfer(regAddress);
SPI.transfer(length);
for (int i = 0; i < length + 1; i++) {
receivedData[i] = SPI.transfer(0x00);
}
// take the SS pin high to de-select the chip:
digitalWrite(SLAVE_SELECT_PIN, HIGH);
SPI.setDataMode(SPI_MODE0);
// Return data read from registers
return receivedData;
}
byte pec(byte crcBuffer[]) {
byte crc = 0;
int temp = 0;
for (int i = 0; i < sizeof(crcBuffer) + 1; i++) {
temp = crc ^ crcBuffer[i];
crc = crcTable[temp];
}
return crc;
}
Unfortunately I have not been able even to set device addresses properly. Below the output I get:
===================
Initializing devices.
ERROR: Bit 7 (ADRRESS_CONTROL) NOT set.
Verify=61
Address Stored=61
Error finding devices...
====================
Any suggestions where to start debugging?
Thanks a lot,
Cesar.
