BEKEN I2C BUS

About I2C Address on BK1086/88 and Arduino platform. More...

Functions
void	BK108X::setI2C (uint8_t i2c_addr=I2C_DEVICE_ADDR)
	Sets I2C bus address.
void	BK108X::i2cInit (int pin_sdio, int pin_sclk)
	Sets the MCU pins connected to the I2C bus.
void	BK108X::i2cBeginTransaction ()
	Starts the I2C bus transaction
void	BK108X::i2cEndTransaction ()
	Finish the I2C bus transaction.
void	BK108X::i2cAck ()
	Sends Acknowledge (ACK)
void	BK108X::i2cNack ()
	Sends Not Acknowledge (ACK)
uint8_t	BK108X::i2cReceiveAck ()
	Gets Acknowledge (ACK)
void	BK108X::i2cWriteByte (uint8_t data)
	Sends a Byte to the slave device.
uint8_t	BK108X::i2cReadByte ()
	Gets a Byte from the slave device.
void	BK108X::writeRegister (uint8_t reg, uint16_t vakue)
	Sends an array of values to a BK108X given register.
uint16_t	BK108X::readRegister (uint8_t reg)
	Gets an array of values from a BK108X given register.

Detailed Description

About I2C Address on BK1086/88 and Arduino platform.

I2C

The BK1086/88 Datasheet says that the I2C buss address is 0x80. However, the Wire (I2C) Arduino library does not find the device on 0x80. Actually the Arduino finds the device on 0x40. This must be due to the internal conversion of the address from 8 bits to 7 bits. (0x80 = 0b10000000; 0x40 = 0b01000000) After a few unsuccessful attempts at using the Arduino I2C library, I decided to write the necessary I2C routines to deal with BK1086/88 device.

See also

setI2C, i2cInit, i2cStart, i2cEndTransaction(), i2cAck, i2cNack, i2cReceiveAck, i2cWriteByte, i2cReadByte, writeRegister, readRegister

IMPORTANT: For stable communication, the rising edge time of SCLK should be less than 200ns.

Function Documentation

setI2C()

void BK108X::setI2C

(

uint8_t

i2c_addr = I2C_DEVICE_ADDR

)

Sets I2C bus address.

Useful if some release of BEKEN device is different of 0x80.

Parameters

i2c_addr

Definition at line 44 of file BK108X.cpp.

i2cInit()

void BK108X::i2cInit	(	int	pin_sdio,
		int	pin_sclk
	)

Sets the MCU pins connected to the I2C bus.

Configures the I2C bus for BK108X

Parameters

pin_sdio	SDA/SDIO MCU/Arduino pin
pin_sclk	CLK/SCLK MCU/Arduino pin

Definition at line 56 of file BK108X.cpp.

Referenced by BK108X::setup().

i2cBeginTransaction()

void BK108X::i2cBeginTransaction

(

)

Starts the I2C bus transaction

Definition at line 65 of file BK108X.cpp.

Referenced by BK108X::readRegister(), and BK108X::writeRegister().

i2cEndTransaction()

void BK108X::i2cEndTransaction

(

)

Finish the I2C bus transaction.

Definition at line 84 of file BK108X.cpp.

Referenced by BK108X::readRegister(), and BK108X::writeRegister().

i2cAck()

void BK108X::i2cAck

(

)

Sends Acknowledge (ACK)

Each byte of data (including the address byte) have to be followed by one ACK bit from the receiver.

The ACK bit allows the receiver to communicate to the transmitter.

See also

https://www.ti.com/lit/an/slva704/slva704.pdf

Definition at line 104 of file BK108X.cpp.

Referenced by BK108X::readRegister().

i2cNack()

void BK108X::i2cNack

(

)

Sends Not Acknowledge (ACK)

See also

https://www.ti.com/lit/an/slva704/slva704.pdf

Definition at line 120 of file BK108X.cpp.

Referenced by BK108X::readRegister().

i2cReceiveAck()

uint8_t BK108X::i2cReceiveAck

(

)

Gets Acknowledge (ACK)

See also

https://www.ti.com/lit/an/slva704/slva704.pdf

Returns

ack value

Definition at line 138 of file BK108X.cpp.

i2cWriteByte()

void BK108X::i2cWriteByte

(

uint8_t

data

)

Sends a Byte to the slave device.

Parameters

data	to be sent to the slave device

Definition at line 160 of file BK108X.cpp.

i2cReadByte()

uint8_t BK108X::i2cReadByte

(

)

Gets a Byte from the slave device.

Returns

value read from the device

Definition at line 182 of file BK108X.cpp.

writeRegister()

void BK108X::writeRegister	(	uint8_t	reg,
		uint16_t	value
	)

Sends an array of values to a BK108X given register.

Parameters

reg	register to be written
value	content to be stored into the register

Definition at line 209 of file BK108X.cpp.

References BK108X::deviceAddress, BK108X::i2cBeginTransaction(), and BK108X::i2cEndTransaction().

readRegister()

uint16_t BK108X::readRegister

(

uint8_t

reg

)

Gets an array of values from a BK108X given register.

Parameters

reg	register to be read

Returns

register content

Definition at line 237 of file BK108X.cpp.

References BK108X::deviceAddress, BK108X::i2cAck(), BK108X::i2cBeginTransaction(), BK108X::i2cEndTransaction(), and BK108X::i2cNack().