Mikroelektronika MIKROE-738 Datenbogen

342

mikoC PRO for PIC32

MikroElektronika

I2Cx_Stop

Prototype

void I2Cx_Stop();

Description Issues STOP signal.
Parameters None.
Returns

Nothing.

Requires

MCU with at least one I²C module.

Used I²C module must be initialized before using this function. See I2Cx_Init routine.

Example

// Issue STOP signal

I2C1_Stop();

Notes

- I²C library routines require you to specify the module you want to use. To select the desired I²C

module, simply change the letter

x in the routine prototype for a number from 1 to 5.

- Number of I²C modules per MCU differs from chip to chip. Please, read the appropriate datasheet

before utilizing this library.

Library Example

This code demonstrates working with the I²C library. Program sends data to EEPROM (data is written at the address

2). After that, program reads data from the same EEPROM address and displays it on PORTB for visual check. See the

figure below how to interface the 24C02 to PIC32.

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void EEPROM_24C02_Init() {

I2C2_Init(

100000

);

}

//--------------- Writes data to 24C02 EEPROM - signle location

void EEPROM_24C02_WrSingle(unsigned short wAddr, unsigned short wData) {

I2C2_Start();

// issue I2C start signal

I2C2_Write(0xA0);

// send byte via I2C (command to 24cO2)

I2C2_Write(wAddr);

// send byte (address of EEPROM location)

I2C2_Write(wData);

// send data (data to be written)

I2C2_Stop();

}

//--------------- Reads data from 24C02 EEPROM - single location (random)

unsigned short EEPROM_24C02_RdSingle(unsigned short rAddr) {

unsigned short reslt;

I2C2_Start();

// issue I2C start signal

I2C2_Write(0xA0);

// send byte via I2C (device address + W)

I2C2_Write(rAddr);

// send byte (data address)

I2C2_Restart();

// issue I2C signal repeated start

I2C2_Write(0xA1);

// send byte (device address + R)

reslt = I2C2_Read(1);

// Read the data (NO acknowledge)

I2C2_Stop();

return reslt;

}