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Sniffing the Rigol's internal I2C bus

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neamyalo:
Finally I have a full memory dump from my DS2072A.

It was taken in a single snapshot, approx 1 min after booting with no user interaction (options details window had timed out/disappeared and CH1/CH2 traces were visible)

https://mega.co.nz/#!rcl23CyD!Pp9LZgukP_k4T2OmqfUtmncP2chWoaGDI0yVS5x5Mis

neamyalo:

--- Quote from: Git on December 26, 2013, 12:45:17 pm ---
--- Quote from: neamyalo on December 24, 2013, 11:06:16 am ---I'm having a few issues with my JTAG probe

--- End quote ---

Thanks for your efforts on this. Did you manage to do a JTAG verify of dump file against the device?. I'm not very familiar with DS code, but there is a lot of 0xFF empty space in the dump which would make me suspicious if I had dumped it.

--- End quote ---

I haven't been able to verify the dump as my JTAG link is extremely slow (12 hours to dump 32MB of SDRAM), but I've no reason to think it is incorrect (i.e. no error messages etc, and "RIGOL Technology" strings are present in the data)

dtran11:

--- Quote from: Avotronics on December 28, 2013, 04:44:12 pm ---

--- Quote from: dtran11 on December 28, 2013, 04:23:30 pm ---
--- Quote from: eltar on December 12, 2013, 06:18:57 pm ---
--- Quote from: eV1Te on December 12, 2013, 06:06:30 pm ---I will try it later tonight as well, just need to hack something together that generates a fast rising edges first, to test the 100 MHz with  :)

--- End quote ---

I can try it too. Is latest DS1000Z firmware 00.02.01.SP1 requested for unlocking 100MHz?
Do we have some info or change list for this firmware? Thanks :)

--- End quote ---

I just got a DS1074Z. Do the keys still work if I upgrade to 00.02.01.SP1? Also is there anyway to revert the options if I need to send in for repair?

Thanks

--- End quote ---

Ifaik the DS1000Z isn't hackable yet.

--- End quote ---

There are codes for the ds1000z already in the latest riglol.

clifford:

--- Quote from: Carrington on December 28, 2013, 02:57:13 pm ---@ clifford: I agree, and I add some additional information that is related, read also attached fille:
[...]

--- End quote ---

Wow! The Agilent AppNote is a good read. Thanks!
(Nothing really new but everything in one place.) :-+

I've bookmarked it for future reference, as this is a topic that seams to come up every now and then.

http://cp.literature.agilent.com/litweb/pdf/5988-8008EN.pdf

PS: When I said "filters with an ideal sinc impulse response" I was referring to "brick wall" filters of course, but I did not remember the word, so I described it. Fortunately it was mentioned in that AppNote, so at least for today I know the word again.

PPS: I really like the introduction to sin(x)/x interpolation given in the following article. (Nothing new there either, just another nice document that summarizes a topic.) But it is ridiculous that they managed to f*ck up the formulas in the pdf..  :palm:

http://www.eetimes.com/document.asp?doc_id=1272526

Teneyes:

--- Quote from: clifford on December 28, 2013, 06:35:04 pm ---PPS: I really like the introduction to sin(x)/x interpolation given in the following article.

--- End quote ---
@ Clifford and Non "first-impressions" readers
Just a few displays to demo Sin(x)/X on the Rigol DS2000, to help show what happens
1. Display of 1 dot off line,
2. Displayed with Vectors,
3. Display of 2 dots off line,
4. Display of 2 samples in vectors,    ( a bit off topic so I will delete soon 18v)

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