Improvements to code

[wystewart]

recommend the following be incorporated into the code to improve it.

In BQ27441::i2cReadBytes and BQ27441::i2cWriteBytes, add delayMicroseconds(66); before return so that the chip has enough time to be ready for the next transaction. This will improve communication reliability

add function to read extended data
uint16_t BQ27441::readExtendedData16(uint8_t classID, uint8_t offset)

{
	uint16_t retData = 0;
    uint8_t *data = (uint8_t *)&retData;

	if (!_userConfigControl) enterConfig(false);
		
	if (!blockDataControl()) // // enable block data memory control
		return false; // Return false if enable fails
	if (!blockDataClass(classID)) // Write class ID using DataBlockClass()
		return false;
	
	blockDataOffset(offset / 32); // Write 32-bit block offset (usually 0)
	
	//computeBlockChecksum(); // Compute checksum going in
	uint8_t oldCsum = blockDataChecksum();
	/*for (int i=0; i<32; i++)
		Serial.print(String(readBlockData(i)) + " ");*/
	data[1] = readBlockData(offset % 32); // Read from offset (limit to 0-31)
	data[0] = readBlockData((offset % 32) + 1); // Read from offset (limit to 0-31)

	if (!_userConfigControl) exitConfig();
	
	return retData;
}

add hard reset function

// Issue a soft-reset to the BQ27441-G1A
bool BQ27441::hardReset(void)
{
	bool ret;

	if (sealed())
	{
		_sealFlag = true;
		unseal(); // Must be unsealed before making changes
	}

	ret = executeControlWord(BQ27441_CONTROL_RESET);

	if (_sealFlag) seal(); // Seal back up if we IC was sealed coming in

	return ret;
}

add function to read capacity

uint16_t BQ27441::getCapacity(void)
{
	return readExtendedData16(BQ27441_ID_STATE, 10);	
}

improve unseal by presenting the read between the second write in ReadcontrolWord. Not sure this is really necessary but I changed it in my version of the code.

// Unseal the BQ27441-G1A
bool BQ27441::unseal(void)
{
	// To unseal the BQ27441, write the key to the control
	// command. Then immediately write the same key to control again.
	//if (readControlWord(BQ27441_UNSEAL_KEY))
	//{
	//	return readControlWord(BQ27441_UNSEAL_KEY);
	//}
	//return false;
    uint16_t function = BQ27441_UNSEAL_KEY;
	uint8_t subCommandMSB = (function >> 8);
	uint8_t subCommandLSB = (function & 0x00FF);
	uint8_t command[2] = {subCommandLSB, subCommandMSB};
	uint8_t data[2] = {0, 0};

	i2cWriteBytes((uint8_t) 0, command, 2);
	i2cWriteBytes((uint8_t) 0, command, 2);
	return true;
}