URGENT! ECP printer port communication speed is slow!

Posted: 09-29-2003, 03:02 PM

Young Tsau

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Hi Netters!

Please help! I've been using VC++ MFC to program the printer port ECP mode
communication with my own device. I can send and read data via the port at
the address 0x278+4, and I write the code to check the status and use
control ports according to the ECP communication handshaking procedure.
However, the communication speed is even slower than SPP or PS2 mode, now is
around 10usec per data (100kbytes/sec). But the specification says it can go

>700kbytes/sec with a 486 PC. My PC has Pentium 4 @2.6GHz and seems no

reason to be slow.

Anybody who has experience with high speed ECP communication please provide
information. A million thanks in advance.

Young

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