Datasheet

Flyport Wi-Fi and Ethernet Programmer's guide framework 2.3 (rev 1.0) www.openpicus.com

Write a byte on I2C → I2CWrite(BYTE data);

This function writes a byte of data .

Parameters:

data: The byte data to be sent

Returns:

0: NACK condition detected

1: ACK condition detected

2: Write Collision detected

3: Master Collision detected

Accessing memory registers of slave devices

The easier way to communicate with a I2C device, is using the ready-to-go functions offered by the

OpenPicus Framework to read/write registers. Using the following functions, you don't need to know

the details of the I2C communications, you are just requested to pass the device and the register(s)

addresses and the commands will exchange the data with the slave device. The functions follows the

standard way to read/write registers on I2C bus, if you experience any problems, always refer to slave

device datasheet to check if some particular operation is required to communicate.

Note on device addressing: in the following functions, with "device address" is intended the 7-bit I2C

address of the device. You can find the default address and how to change it in the datasheet of each

I2C device. The address will be correctly shifted and added with the read/write bit by the read/write

functions

Read a single register → I2CReadReg( BYTE DeviceAddr,

BYTE RegisterAddr,

unsigned int rwDelay);

This function to read a byte of data from a specific device.

Parameters:

DeviceAddr: The byte address of slave device

RegisterAddr: The byte address of memory register to read

rwDelay: The delay (expressed in 10us) between write and read operations

performed. This delay is needed by some I2C devices (please see slave

datasheet for further info)

Returns:

char of data read.

Reading mulLple registers → I2CReadMulti( BYTE DeviceAddr,

BYTE RegisterAddr,

BYTE destination[],

unsigned int numReg,

unsigned int rwDelay);

This function to read a “numReg” amount of bytes starting from a specific address.