PIC24-dsPIC33-I2C-driver

Simple to use PIC24 / dsPIC33 I2C slave driver

A simple I2C driver for PIC24 and dsPIC33

As it might be useful for some, this slave driver is enclosed and easy to use.

Usage:

Initialisation

#define I2CBUFFERSIZE 512

void i2cReadRequest(unsigned char command);
void i2cDataReady(char * buffer);
void i2cDataSent();

unsigned char i2cReceiveBuffer[I2CBUFFERSIZE];
unsigned char i2cReceiveBuffer[I2CBUFFERSIZE];

void initApplication()
{

    i2cSlaveInit(   address , 
                    mask , 
                    (void *) i2cReadRequest, // callback for read request
                    (void *) i2cDataReady, // callback for write request
                    (void *) i2cDataSent, // callback for datasent
                    i2cReceiveBuffer, 
                    sizeof (i2cReceiveBuffer), 
                    2, 
                    i2cSendBuffer, 
                    sizeof (i2cSendBuffer), 
                    1 // I2C driver (I2C1 or I2C2)
            );
}

Events handling

Call from the main loop:

void main ()
{
    while (1) {
	    i2cDoEvents(1); // I2C driver (I2C1 or I2C2)
    }
}

Callbacks

Read Request:

char someData[32];
void i2cReadRequest(unsigned char command)
{    
    switch (command)
    {
        case SOMETHING:
            i2cReply(someData);
            break;

        default:
            break;
    }
}

Write Request:

void i2cDataReady(char * buffer)
{
    unsigned char * buf = (unsigned char * ) &buffer[1];

    switch (buffer[0])
    {
        case SOMETHING:
            doSomething(buf);
            break;
    }
}

Data sent:

void i2cDataSent()
{
    toggleLed();
}