thanks @all - now it works!
only i have a problem.
After i read from the i2c Bus 2 char's to a pointer (char *buffer). the buffer is empty and wenn i
printf( "buffer: %x\n", buffer[ 0 ] );
printf( "buffer: %x\n", buffer[ 1 ] );
the buffer inherits the data from the i2c bus.
wenn i print that in one line it dosend work.
I use Keil.
what i make wrong?