Mikroelektronika MIKROE-738 Datenbogen

mikroC PRO for PIC32

MikroElektronika

415

The  mikroC  PRO  for  PIC32  provides  routines  for  implementing  Software  I²C  communication.  These  routines  are 

hardware independent and can be used with any MCU. The Software I²C library enables you to use MCU as Master in 

I²C communication. Multi-master mode is not supported.

Important: 

- This library implements time-based activities, so interrupts need to be disabled when using Software I²C. 

- All I²C Library functions are blocking-call functions (they are waiting for I²C clock line to become logical one). 

- The pins used for the Software I²C communication should be connected to the pull-up resistors. Turning off the LEDs 

connected to these pins may also be required. 

- Every Software I²C library routine has its own counterpart in Hardware I²C library, except 

I2C_Repeated_Start. 

Soft_I2C_Start

 is used instead of 

I2C_Repeated_Start

. 

- Working clock frequency of the Software I²C is 20kHz. 

extern sbit Soft_I2C_Scl;

Soft I²C Clock line.

sbit Soft_I2C_Scl at RB11_bit;

extern sbit Soft_I2C_Sda;

Soft I²C Data line.

sbit Soft_I2C_Sda at RB12_bit;

extern 

sbit 

Soft_I2C_Scl_

Direction;

Direction  of  the  Soft  I²C  Clock 

pin.

sbit 

Soft_I2C_Scl_Direction 

at 

TRISB11_bit;

extern 

sbit 

Soft_I2C_Sda_

Direction;

Direction of the Soft I²C Data pin.

sbit 

Soft_I2C_Sda_Direction 

at 

TRISB12_bit;

External dependencies of Software I²C Library

Library Routines

 

- Soft_I2C_Init 

 

- Soft_I2C_Start 

 

- Soft_I2C_Read 

 

- Soft_I2C_Write 

 

- Soft_I2C_Stop 

 

- Soft_I2C_Break