[Gumstix-users] I2C_IO_WriteReg Problem

[RussellMorin <rm...@wp...>]

Hello,

I run the following code:
       (before main)
       #define TCCR1A 0x4F
       (in main)
        const char *i2cDevName = "/dev/i2c-0";
        int i2cDev = -1;
    	int gI2cAddr = 0x0b;
 
    	if (( i2cDev = open( i2cDevName, O_RDWR )) < 0 )
    	{
    	    	printf( "Error  opening '%s': %s\n", i2cDevName, strerror( errno
));
    	    	exit( 1 );
    	}
 
    	// Indicate which device we wish to speak to
    	I2cSetSlaveAddress( i2cDev, gI2cAddr, I2C_USE_CRC );

	// Setup the timers

	I2C_IO_WriteReg8(i2cDev, TCCR1A, 0xAA);

And I get the following error:
       ERROR: I2cTransfer: ioctl failed: Remote I/O error (121)
       ERROR: I2C_IO_WriteReg8: I2cWriteBlockFailed: Remote I/O error (121)

I've tried several different permutations of the last line of code and
looked through the servo code in the forums, but I can't get the program to
write to the register. Any help would be greatly appreciated.

Thanks,
-Russ Morin

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