I'm working on implementing different options and trying to find out
what the impact on the performance is.
A really bad (say hurried) implementation of (1) ioctl(fd, PPSPEW,
buffer, len) gave me 50% performance gain over (2) for(;len>0;ioctl(fd,
PPWDATA, buffer++), len--).
Earlier I used (3) ioperm() and outb(). This was about twice as fast as (1).
As soon as I know more, I'll let you know.
I'm also thinking whether there is no easy solution to add handshaking
to such simple devices. For serial ports you could just connect two pins
and have "hardware handshaking". Is this also possible for parallel
ports (if yes, for which modes [ECP with DMA would be nice])?
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This archive was generated by hypermail 2b29 : Tue Apr 03 2001 - 18:29:43 EDT