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Sniffing the Rigol's internal I2C bus

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Leiothrix:

--- Quote from: smgvbest on December 17, 2014, 12:58:01 am ---I'm sure if guys where called Ms all the time they'd see it differently

--- End quote ---

I'm a guy and I don't particularly care.

It just depends on the gender balance of where you are (whether IRL or online), it doesn't mean anything.  Depending on the maturity level of the place it's probably better to be lumped in with the majority by assumption.

If you want to avoid (most) wrongly gendered pronouns you can pick a strongly gendered name.  That has it's own problems in some places, but I don't think this board is one of them where gender matters.

Howardlong:
Here are some further notes regarding the DSA815 with bootloader 1.04 and firmware 1.09.

If the WP on the FRAM is disabled, I understand that the network parameters and startup parameters can't be changed.

The WP does not connect to anything, it has a weak pull down internally, so it would appear that just shorting pins 7 & 8 (WP & VDD) would stop the FRAM being updated with the time-on-since-new every 10 seconds, suggesting that there is no need to lift pin 7.

Furthermore, although the I2C SCL line is held low, there is a short period at power up time, about 400ms, when the SCL line is pulled high to VDD with a standard I2C pullup. Both SCL and SDA are open drain high at this point.

By performing a re-write of the time-on-since-new within this 400ms timeframe apparently it is possible to reset the time without disabling the updating of non-volatile parameters.



kwass:

--- Quote from: smgvbest on December 16, 2014, 04:10:36 pm ---That's the one I followed and it works fine.   Thanks for posting the link
Patients is definitely the key to removing it intact.  It took me closer to 10 minutes to remove mine.

--- End quote ---

Sandra,

I used a heat gun from a few inches away and the sticker peeled away in seconds, then stuck back on like new.  I just went inside this machine to change the noisy fan to something I could tolerate, nothing so elaborate as you did.  Nice work!

-Katie

(p.s.  I too had a lot of women in my computer science graduate school class of 1985, but it's gotten really bad since then.)

phersus:
Hello Guys,

Incredible and fantastic job, congrats to all who participated directly or indirectly to this success.  :clap:

I am, as many here, a hobbyist. I also have an MSO1074z and want to go through the unlocking process.
After many tries under mac OS X all of them unsuccessful (openocdb works but the Olimex Jtag adapater not being recognised) I decided to try it under Windows.

Under Windows I could go a little farther, however still stuck and want to ask the ones who have been playing with this if when plugging the Jtag adapter to the PC the target device needs to be connected as well. The reason I'm asking is that I've not yet opened the oscilloscope; I wanted to test that openocd and the Olimex Jtag adapter are working first.

Any guidance would be really appreciated.

Thanks a lot,
Gus

hammy:
Hi,

yes, the device needs to be connected to the ARM-USB-OCD-H jtag port first. Then you can plug it into the pc and start openocd and it will open the device. If nothing is connected some message like "open device failed" shows up.

Cheers
hammy

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