Re: [linrad] RE: USB peripheral Radio

[Richard Hosking <richardh@xxxxxxxxxxxxxxxx]

The chip would presumably be initialized and then be left to produce 
data without further interruption. It would need some sort of 
interface/data buffer for a parallel port as you say. I suspect whatever 
the interface, some sort of electronics will be required between the IF 
chip and the PC. There is a fair bit of software to do in the PC also. I 
am not currently skilled enough in programming to do this sort of task, 
but I could do the PCB design and design a microcontroller interface, 
which would do the IF chip setup. I am about to embark on a post 
graduate IT course (my day job is medical!) - in time I might learn 
enough about the programming as well.

Richard


Leif Åsbrink wrote:

> Hi,
>
>  
> > How difficult would it be to adapt Linrad to such a device? (ie control 
> > software with digital data input rather than analog)
> > Any ideas?
> >    
> It is probably extremely easy.
> Linrad already has a mode with digital input. It is the network mode:-)
>
> The problem will be to write the control routines for the digital
> decimation chip that samples down to a rate that the PC can handle
> and maybe there could be problems using USB, firewire or ethernet
> drive routines. Using the parallel port would be trivial if the
> hardware has a buffer that can hold enough data in a FIFO. One could
> use some control pin to tell the hardware that Linrad wants to read
> how many data words the buffer currently holds and then just read
> from the parallel port. I think I can interleave such read statements
> in the fft code in a way that will be compatible to the hardware 
> capabilities. It would of course be much better to use an interrupt 
> driven device driver - but that would be beyond my programming skills.
>
> 73
>
> Leif
>
>
>
>
>
>  


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