I2C Class

class I2CClass : public Acroname::BrainStem::EntityClass

I2CClass: Interface the I2C buses on BrainStem modules. The class provides a way to send read and write commands to I2C devices on the entities bus.

Public Functions

I2CClass(void)

Constructor.

virtual ~I2CClass(void)

Destructor.

void init(Module *pModule, const uint8_t index)

Initialize the class.

Parameters:

  • pModule – The module to which this entity belongs.

  • index – The index of the digital entity being initialized.

aErr read(const uint8_t address, const uint8_t readLength, uint8_t *buffer)

Read from a device on this I2C bus.

Parameters:

  • address – - The I2C address (7bit <XXXX-XXX0>) of the device to read.

  • readLength – - The length of the data to read in bytes.

  • buffer – - The array of bytes that will be filled with the result, upon success. This array should be larger or equivalent to aBRAINSTEM_MAXPACKETBYTES - 5

Returns:

Returns common entity return values

aErr write(const uint8_t address, const uint8_t bufferLength, const uint8_t *buffer)

Write to a device on this I2C bus.

Parameters:

  • address – - The I2C address (7bit <XXXX-XXX0>) of the device to write.

  • bufferLength – - The length of the data to write in bytes.

  • buffer – - The data to send to the device, This array should be no larger than aBRAINSTEM_MAXPACKETBYTES - 5

Returns:

Returns common entity return values

aErr setPullup(const bool bEnable)

Set bus pull-up state. This call only works with stems that have software controlled pull-ups. Check the datasheet for more information. This parameter is saved when system.save is called.

Parameters:

bEnable – - true enables pull-ups false disables them.

Returns:

Returns common entity return values

aErr setSpeed(const uint8_t speed)

Set I2C bus speed.

This call sets the communication speed for I2C transactions through this API. Speed is an enumeration value which can take the following values. 1 - 100Khz 2 - 400Khz 3 - 1MHz

Parameters:

speed – - The speed setting value.

Returns:

Returns common entity return values

aErr getSpeed(uint8_t *speed)

Get I2C bus speed.

This call gets the communication speed for I2C transactions through this API. Speed is an enumeration value which can take the following values. 1 - 100Khz 2 - 400Khz 3 - 1MHz

Parameters:

speed – - The speed setting value.

Returns:

Returns common entity return values