[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Discuss-gnuradio] Software HDTV
From: |
Daniel Piccoli |
Subject: |
[Discuss-gnuradio] Software HDTV |
Date: |
Tue, 09 Sep 2003 10:35:22 +0800 |
I've heard that realtime software HDTV is not yet possible with current
processor speeds. Is it possible remedy this by using networked
distributed computing (provided we are on a low latency network)?
On Mon, 2003-09-08 at 00:07, address@hidden wrote:
> Send Discuss-gnuradio mailing list submissions to
> address@hidden
>
> To subscribe or unsubscribe via the World Wide Web, visit
> http://mail.gnu.org/mailman/listinfo/discuss-gnuradio
> or, via email, send a message with subject or body 'help' to
> address@hidden
>
> You can reach the person managing the list at
> address@hidden
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Discuss-gnuradio digest..."
>
>
> Today's Topics:
>
> 1. I2C Addresses (Alan Gray)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 07 Sep 2003 17:59:27 +1000
> From: Alan Gray <address@hidden>
> Subject: [Discuss-gnuradio] I2C Addresses
> To: address@hidden
> Message-ID: <address@hidden>
> Content-Type: text/plain; charset="us-ascii"
>
> Hi all,
>
> I've just finished designing and building the hardware for my RF front end
> using the 4702 tuner and I'm looking to test it out. The structure of the
> control data for the 4702 is quite different to the 4937 though, so I have
> to go through and code a new interface for that side of things. Naturally
> I'm basing this off the code in microtune_4937.cc, I believe I've got the
> generation of the control bytes down, however I'm stumped about some
> addressing issues, even though the address should be the same as when using
> the 4937 according to data sheets.
>
> In microtune_4937.cc the address listed for the tuner is 0x61 = 0110 0001
> From the data sheets and the connections made (ie pin 11 to ground) I get
> an address of 0xC0 = 1100 0000
>
> As neither of these addresses worked correctly for me, I decided to test
> communications with the MAX518 chip (as they are both connected to the same
> bus I figured that would rule out any errors in transmission) and was able
> to change the output voltage of the chip using the code in
> microtune_eval_board.cc. Looking at the addresses used for the MAX518 chip,
> the address in the program is 0x2C = 0010 1100, while that I calculate is
> 0x58 = 0101 1000.
>
> From the MAX addresses, it looks like the address in the program is the
> address I determined right circular shifted one position
> 0101 1000 ->right shift
> 0010 1100
>
> However, while similar, the same does not hold for the 4937's address
>
> 1100 0000 ->right shift
> 0110 0000
> which is 0x60 not 0x61
>
> As such, I'm a little confused as to what address I should use, and how in
> fact these should be generated. Any assistance anyone can provide would be
> most appreciated as I believe if I can figure this out everything should be
> go.
>
> Alan
>
> ------------------------------
>
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> http://mail.gnu.org/mailman/listinfo/discuss-gnuradio
>
>
> End of Discuss-gnuradio Digest, Vol 10, Issue 2
> ***********************************************
- [Discuss-gnuradio] Software HDTV,
Daniel Piccoli <=