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RE: Re[2]: Par port DMA



Hi,

In ECP mode the Busy signal is used as an ACK from the device. Lots of
info and diagrams can be found in:
 
http://developer.axis.com/doc/hardware/etrax100lx/des_ref/ET100LX_14_Par
allel_Ports_010215.pdf

Also note that you'll need external inverters and probably a buffer as
Per mentioned. Refer to the schematics for the developer board.

/Mikael

-----Original Message-----
From: Yuriy Prokazov
To: Mikael Starvik
Cc: dev-etrax
Sent: 2003-09-24 18:54
Subject: Re[2]: Par port DMA

Hello Mikael, thank you.

It seems that cod is OK. I wonder how it works inside. Does DMA
controller check the busy line?

MS> I haven't studied the code in detail but here are some pointers:
MS> For the parallel port to work you have to enable it and connect the
DMAs
MS> to it in R_GEN_CONFIG. You also have to make sure that other
interfaces
MS> that uses the same pins and/or DMA channels (e.g. IDE) are disabled.

Yuriy.