[hpsdr] Pandora Enclosure Project Proposal.

[Lyle Johnson]

> Wouldn't the simplest route be to use a USB to USB inter board connector

No, that means that the DSP has to support a host mode USB interface. 
That would be a huge processing load.

We need something simple, and with enough bandwidth to handle what we 
need.  I suspect what we need is just a spectrum display with not more 
than 320 bins (assuming a QVGA display,it only has 320 horizontal 
pixels, perhaps 8 bits of amplitude information (gives 256 levels, 
display is less than this verticaly) -- and 4  bits may be enough for a 
bandscope display - and refreshed perhaps 20 times/second.  This is only 
(320*8*20 = ) 51,200 bits/sec.  Easy to do on SPI or I2C.  SPI is 
simpler, but the DSP chip has both interfaces built-in and I suspect the 
ARM chip will as well.  Have to see which of them are actually available 
after all the necessary stuff gets attached for its DSP mission, though, 
since the peripheral pins are multiplexed...

Lyle K7P


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