[PARPORT] Parallel Port FIFO mode

Tim Waugh (tim@cyberelk.demon.co.uk)
Sun, 20 Dec 1998 12:59:01 +0000 (GMT)

Hi guys,

In a few minutes you should be able to get:

This has got all the usual IEEE1284 stuff, plus some parport_pc changes.
ECP ports are now examined a little more closely, and, if applicable, the
FIFO is used for compatibility (normal) mode. It Works For Me. People
with absurdly fast printers and appropriate parallel port chipsets might
notice a slight speed-up, because the handshake is being done in hardware

The thing with using the FIFO is that peripheral sharing will probably
suck, so it should be possible to force software handshaking for SPP mode.
That's another reason for using the software ECP routine, actually: when
it is important that port-sharing is fast.

At the moment, the criteria for using the FIFO are:
- the port supports ECP mode
- we can get interrupts from it

Let me know of successes and failures.


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This archive was generated by hypermail 2.0b3 on Wed 30 Dec 1998 - 10:18:58 EST