Infineon I2C Read Ext Device 1 Manuale utente

AURIX™ TC2xx Microcontroller Training

V1.0.0

I2C_Read_Ext_Device_1

Read external device MAC address via I2C

Please read the Important Notice and Warnings at the end of this document

Scope of work

An I2C module configured as I2C master is used to read a register of an

external device.

An I2C module configured as I2C master is used to read the MAC address

stored in MCP79411, a Real-Time-Clock device mounted on the board

KIT_AURIX_TC297_TFT_BC-Step. The AURIX™ device reads the MAC

address through the I2C module and stores it into a global variable.

Introduction

›The I2C protocol was developed to provide a simple and efficient data

transfer between multiple devices over a short distance.

›It uses a bidirectional serial bus with two wires. A serial data line (SDA)

and a serial clock line (SCL) are carrying the information between multiple

devices.

›Both lines are connected to a positive supply voltage via pull-up resistors.

›An I2C device can work as a master or as a slave. The master, which is

normally a microcontroller, initiates and terminates the transfer and

generates the clock pulse.

›A specific slave can be addressed by the master via a 7- or 10-bit

address. Afterwards the master starts the communication.

–Data can flow in either direction and can be set via a data direction bit,

which is transmitted by the master.

Hardware setup

This code example has been

developed for the board

KIT_AURIX_TC297_TFT_BC-Step

The MCP79411 chip is mounted on

the board and connected via the I2C

bus to the microcontroller.

The used data lines are connected to

the positive power supply via two

pull-up resistors.

The MCP79411 is a battery-backed

I2C Real-Time Clock/Calendar

(RTCC) device with SRAM,

EEPROM and protected EEPROM.

Implementation

Configuring the I2C communication

The configuration of the I2C communication is done once in the setup phase

in two different steps:

›The initialization of the I2C module by initializing an instance of the

IfxI2c_I2c_Config structure

›The initialization of every device that is connected to the I2C module (in this

case, the MCP79411 chip) by initializing an instance of the

IfxI2c_I2c_deviceConfig structure for each device

Implementation

Configuring the I2C module

The function IfxI2c_I2c_initConfig() initializes an instance of the structure

IfxI2c_I2c_Config with its default values.

The IfxI2c_I2c_Config structure allows setting the parameters to initialize the

module:

›baudrate –to set the clock speed in bit/s. Typical values are 100 kbit/s in

standard mode, 400 kbit/s in fast mode and 3.4 Mbit/s in high-speed mode.

›pins –a structure to set the port pins used for the communication.

A serial data line (SDA) and a serial clock line (SCL) carry the information

between the devices, therefore two port pins are required.

The function IfxI2c_I2c_initModule() initializes and activates the I2C module

with the user configuration in master mode.

The functions above are provided by the iLLD header IfxI2c_I2c.h.

Implementation

Configuring the I2C device

The function IfxI2c_I2c_initDeviceConfig() initializes an instance of the

structure IfxI2c_I2c_deviceConfig with its default values.

Afterwards, the 7-bit slave address can be set through the parameter

deviceAddress.

The function IfxI2c_I2c_initDevice() finalizes the I2C initialization by connecting

the device configuration with the preconfigured I2C module.

The functions above are provided by the iLLD header IfxI2c_I2c.h.

Implementation

Establish I2C communication

Data transfer between the external device and the microcontroller is

divided into two steps:

›Firstly, the microcontroller is transmitting the address of the register, in which

the requested data is stored on the external device (the register containing

the MAC address of MCP79411 is 0xF2). This is done using the

IfxI2c_I2c_write() function.

›Then, the reading of the MAC address is started with the function

IfxI2c_I2c_read().

Both the write and read functions are defined in the iLLD header IfxI2c_I2c.h.

Run and Test

After code compilation and flashing the device, perform the following steps:

›Use the debugger to watch the hexadecimal value of the

global array g_macAddr. The MAC address is unique for each board.

Run and Test

›A second test can be performed with

an oscilloscope. Two oscilloscope

probes can be connected to SDA and

SCL pins to observe the generated

and received signals.

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