/* 
 * Example code to read the contents of an I2C EEPROM chip.
 */

#include <stdio.h>
#include <stdlib.h>
#include <mpsse.h>

int main(void)
{
    FILE *fp = NULL;
    char *data = NULL;
    int retval = EXIT_FAILURE;
    struct mpsse_context *hmc5883 = NULL;
    char buf[1024] = {0};

    if((hmc5883 = MPSSE(I2C, FOUR_HUNDRED_KHZ, MSB)) != NULL && hmc5883->open)
    {
        printf("%s initialized at %dHz (I2C)\n", GetDescription(hmc5883), GetClock(hmc5883));
	
        /* Write the EEPROM start address */	
        buf[0] = 0x3C;
        buf[1] = 0x00;
        buf[2] = 0x70;
        Start(hmc5883);
	Write(hmc5883, buf, 3);

        if(GetAck(hmc5883) == ACK)
        {
            /* Read the register 0x00 */
            Start(hmc5883);
            data = Read(hmc5883, 1);
            if(data)
             {
                printf("Data %d\n",data[0]);
                free(data);
             }
	
             /* Tell libmpsse to send NACKs after reading data */
             SendNacks(hmc5883);

             /* Read in one dummy byte, with a NACK */
             Read(hmc5883, 1);
        }

            Stop(hmc5883);
    }
    else
    {
        printf("Failed to initialize MPSSE: %s\n", ErrorString(hmc5883));
    }

    Close(hmc5883);

    return retval;
}