Products > Test Equipment

Sniffing the Rigol's internal I2C bus

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Flipp:
Lol:
DS2000 Series is a new generation oscilloscope. It has 2 channels. It has a sibling version with logic analyser DS2000D. The maximum bandwidth is 200M, and the peak sampling rate is up to 1G.
 :-DD
From HTML Page inside Jtag Dump

Flip :wtf:

AndersAnd:

--- Quote from: tirulerbach on December 28, 2013, 09:52:51 pm ---Hello,

I remembered I'm owning a JTAG-Dongle...  :-/O It is an Olimex ARM-USB-OCD. In the meantime I opened my DS2202A, attached the JTAG, downloaded the bfin-uclinux stuff and started urjtag:


--- Code: ---jtag> cable arm-usb-ocd
Connected to libftdi driver.
jtag> frequency 500000
Setting TCK frequency to 500000 Hz
jtag> detect
warning: TDO seems to be stuck at 0
jtag>

--- End code ---

Lower frequencies didn't work either...

So after fiddling a little bit I assume that the Utst  Voltage (3.3V) on Pin 1 on the JTAG header is to weak. According to the schematic posted above it is connected via a pull-up of 10k to 3.3 Volts. The voltage drops to about 1.8V when I connect the JTAG-dongle. That is about 150uA.

So, do you think I just can use an external 3.3V supply for the JTAG-dongle?

Maybe this is the same issue which neamyalo very slow jtag speed? What do you think?

--- End quote ---
From what I have understood from Cybernet's posts about Rigol JTAG interfacing you have to add the 10k and 3k9 pull-up resistors externally yourself. Did you measure the resistance from SRST [pin 2] and TRST [pin 10] to 3.3V [pin 1]?

--- Quote from: cybernet on June 03, 2013, 07:25:34 pm ---Just managed to discover the BF526 on the JTAG chain :-DD  >:D

Pinout:


--- Quote ---   3,3V      (1)   (2) /EMU, /SRST (use a 10k pullup to 3,3V)
   no pin   (3)   (4)  unused (seems to be GND)
   nc         (5)   (6) TMS
   GND      (7)   (8) TCK
   GND      (9)   (10) /TRST (use a 10k pullup to 3,3V)
   GND    (11)  (12) TDI
   GND    (13)  (14) TDO

--- End quote ---

The 14pin header near the Blackfin. I actually think i fried my 3,3V on Pin1 - even if loaded with 10k it drops down to 1V,
so im running the pullup for pin (2) to the 4 pin connector on the opposite side of the PCB labeled VCC (3,3V) instead of pin1

CAUTION: the usual ADI JTAG has pin1 connected to GND (this shorts VCC to GND), which probably killed my VCC there ...
Scope is still fine, so just fried some output stage somewhere i guess ;)

For the jtag adapter itself im using the Amontec JTAG Key Tiny (30$) - TopJTAG eval discovers an Analog Devices BF526 (IDCODE=227E0CBh) ... next up trying urJTAG + bfin-gdb.

JTAG Key: http://www.amontec.com/

--- End quote ---

--- Quote from: cybernet on July 30, 2013, 09:15:44 pm ---started dumping memory via JTAG on the DG4000 - no probs at all exact same layout as the DS2000's JTAG - aux 3,3V can be stolen from the header next to it if needed for jtag adapter.


--- End quote ---

tirulerbach:

--- Code: ---jtag> frequency 5000000
Setting TCK frequency to 5000000 Hz
jtag> detect
IR length: 5
Chain length: 1
Device Id: 00100010011111100100000011001011 (0x227E40CB)
  Manufacturer: Analog Devices, Inc. (0x0CB)
  Part(0):      BF526 (0x27E4)
  Stepping:     2
  Filename:     ./../share/urjtag/analog/bf527/bf527
jtag>
--- End code ---

 :-DD No risk no fun... There is a "SPI BOOT" header oh the right side of the PCB. Pin 7 has 3.3 Volts and it works...  8)

So now I'm learning how to dump that beast....

m-joy:
Dumpy dumpy dooo!
The only Problem that i see is.... Cybernet seems to be the only one that can handle the dump xD

tirulerbach:
Yeah, looks like that dumping works. About 50 KByte/s.  :=\
Results are consistent.  :-+

So, I have questions:  ::)

a.) How large is the RAM? 64 Meg?
b.) How to enter into the boot-loader on startup? I read somewhere the dump in boot-loader mode is also needed?

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