slavegetsi2c1.c

PIC driver for ILI9325 display

#if defined(__PIC24F__)
#include <p24Fxxxx.h>
#endif
#include <i2c.h>

/************************************************************************
*    Function Name:  SlavegetsI2C1  
*    Description:    This routine reads bytes from the I2C bus until  
*                    stop bit is received.
*    Parameters:     unsigned char * : rdptr
*                    unsigned int    : i2c_data_wait            
*    Return Value:   unsigned int    : number of bytes received
*************************************************************************/
#ifdef _I2C_V2_1

unsigned int SlavegetsI2C1(unsigned char * rdptr, unsigned int i2c1_data_wait)
{
    int i = 0;                          /* i indicates number of bytes received */
    int wait = 0;
    unsigned char temp = I2C1RCV;        /* flush out old data already on I2CRCV to clear RBF flag */

    I2C1STATbits.I2COV = 0;              /* clear OV flag */

    while(!I2C1STATbits.P)               /* check for stop bit */
    {
        while(!DataRdyI2C1())
        {
            if(wait < i2c1_data_wait)    /* timeout check */
                wait++ ;                 
            else
                return i;               /* return the number of bytes received */       
        }
        wait = 0;
        *rdptr++ = I2C1RCV;              /* save byte received */

        i++;                            /* Increment the number of bytes read */

        I2C1CONbits.ACKDT = 0;      /* generate ACK sequence */
        I2C1CONbits.ACKEN = 1;
        while(I2C1CONbits.ACKEN == 1);  /* Wait till ACK sequence is over */

        if((I2C1CONbits.STREN) && (!I2C1CONbits.SCLREL))
            I2C1CONbits.SCLREL = 1; /* Clock is released after ACK */

    }
    return i;               /* return the number of bytes received */
}




#else
#warning "Does not build on this target"
#endif