Hello from Gregg C Levine
What sort of "some home brewed hardware", Mark, is this? That's the
principal reason behind my rejoining this list. I am planning on designing
such hardware, (data upload, and data display), during coming months, and I
want to actually solicit some advice.
For example does a generic library exist for the Parport? And where would I
be able to find it? Also, I'd be interested in finding out more about this
problem that you are relating, as I suspect more of us would. If at all
possible, folks please post such replies directly to this address, and thus
to the list, I do not want to flood the list, unless necessary.
Gregg C Levine email@example.com or
"May the Force be with you!"
----- Original Message -----
From: "mark anderson" <firstname.lastname@example.org>
Sent: Monday, March 10, 2003 7:49 PM
Subject: [PARPORT] ECP and DMA
> I'm playing with some home brewed hardware to upload data into
> my linux box. With EPP I'm getting about .5 MBytes/sec. I see
> claims that 2M should be the upper limit. Is there a specific
> mode that runs this fast (EPP/ECP/???). I can make my hardware
> do whatever protocol and timing makes things fastest.
> In a related speed issue, I'd like to use the DMA channel. However,
> I've found a note in the parport bug list (Suse, 2.4.10-4.GB):
> o parport_pc_ecp_read_block_pio() is broken. parport will revert to the
> software-driven mode in ieee1284_ops.c
> Is this telling me that DMA reads under ECP are broken? As I read
> various parallel port documents I'm lead to believe that only ECP
> supports DMA.
> Any thoughts would be appreciated. Thanks.
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This archive was generated by hypermail 2b29 : Tue Mar 11 2003 - 19:49:49 EST