Hi, to use the printf function you can modify the putchar routine. But my characters are sent over i2c. So if i sent four strings from 16 characters there are minimal 64 i2c messages sent. This takes a lot of time. The best way is to modify the printf routine, but that's not possible because the source code is not available. Does anyone has a suggestion how to solve this problem and still have MODULAR code?

thanks,
Frank