[hpsdr] [JANUS] Offloading SDR-1000 reguired I/O from OZY

[pvharman at arach.net.au]

Hi Alex,

I'm not sure how fast the Parallel port to SDR1000 hardware interface needs to 
be but one idea I had was to use a 16 bit I2C port expander to do the 
interface. I have one hanging off my Janus breadboard, controlled over the 
USB/Xylo interface,  that I use for slow I/O like band switching, it works 
fine. I guess the DDS  needs the fastest update rate but I'm not sure what 
speed you can actually get from a parallel port under XP. 

Whilst adding another dedicated I/O board to meet the needs of bulk switching 
(a la UCB) is a good idea, all I really want is  PTT, dot and  dash  inputs 
and an open collector output to control my linear. With those lines I have a 
radio with a few boards in the Atlas bus that I can actually use and it puts 
off the need for a bus expander for a while. If I do want complex or more I/O 
features then I can add the fully featured I/O board later on.

73's Phil...VK6APH 





Quoting Alex <harvilchuck at yahoo.com>:

> ***** High Performance Software Defined Radio Discussion List *****
> 
> Since JANUS is a board meant for interfacing to the SDR-1000, can the design
> assume the responsibilities of managing the Parallel port control connection
> too? That would offload some activity from OZY and consolidate the SDR-1000
> interface into JANUS.
> 
> Alex, N3NP
> 
> 
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