> The real question is does peolple ("programmers") use polling or
> interrupts for I2C. Any help ?

You can use either.  I often use a separate pseudo-thread to handle a
communications stream.  This can use polling directly and yield the
processor when the hardware is not ready.  It can also be interrupt driven
with the thread only run from the main event loop when a suitable
interrupt is received.

Take a look at my template host command processing module, QQQ_CMD.ASPIC
at http://www.embedinc.com.  This uses a pseudo thread to process a
command stream from a host.  In this case the byte stream is received from
the UART, which is handled by interrupts, not polling.  The UART handling
code, including the UART specific interrupt routines, is in the
QQQ_UART.ASPIC module.

I have used this same principle in handling IIC streams.


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