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Old 28th March 2013, 01:19 AM   #1391
casshan is offline casshan  Hong Kong
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Boards received, thanks a lot!
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Old 28th March 2013, 07:39 AM   #1392
mkc is offline mkc  Denmark
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Boards received monday.

Thanks!
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Old 28th March 2013, 08:54 AM   #1393
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Quote:
Originally Posted by Jackal29a View Post
Sorry, by BIOS I menat the TPA firmware chip.
Haven't measured yet but I'll try doing SCL tomorrow, guess it'll be TTL 1.65V level, right? measuring data could be problematic if it produces short burts when commands are sent.
I'll also try post some pics of the wiring but I did twist each wire with a GND line joined them at the Buffalo's end.
The TPA firmware is only active at DAC power up after which it goes to "sleep" so shoudn't be interfering with the commands. The I2C bus will be powered by the 3.3V supply I assume. Not sure whether you can actually measure this on SCL with a multimeter, ideally you need a digital scope. What I meant originally was a simple continuity test with a multimeter on the wiring. SDA is pin 21 and SCL pin 22 on the Sabre chip if you wanted to test continuity right to the chip.
Edit-
Oops just noticed that you are using 0xA for your register, it should be 0x0A. That should sort it!!

Last edited by themystical; 28th March 2013 at 09:01 AM. Reason: Added Register 10 in Hex
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Old 28th March 2013, 10:33 AM   #1394
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Even if you type 0x0A the tool displays it as 0xA. Actually it is possible to write the register # in dec and it'll get converted and diplayed in hex (10->0xA). The same is possible with address value but it'll display 0x90 instead of 0x48. Strangely enough this doesn't work with value, if I type 11001111 (0xCF) the tools shows 0x17.

Edit:

I measured and there is continuity.

Last edited by Jackal29a; 28th March 2013 at 10:56 AM. Reason: addtional testing done
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Old 28th March 2013, 11:00 AM   #1395
vzs is offline vzs  Europe
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Board received!
Thanks, Zsolt
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Old 28th March 2013, 11:35 AM   #1396
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Join Date: Jun 2004
Location: Bath, UK
Quote:
Originally Posted by Jackal29a View Post
Sorry, by BIOS I menat the TPA firmware chip.
Haven't measured yet but I'll try doing SCL tomorrow, guess it'll be TTL 1.65V level, right? measuring data could be problematic if it produces short burts when commands are sent.
I'll also try post some pics of the wiring but I did twist each wire with a GND line joined them at the Buffalo's end.
Do you have pull up resistors on the I2C lines?
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Old 28th March 2013, 11:40 AM   #1397
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Quote:
Originally Posted by dickiegeorge View Post
Do you have pull up resistors on the I2C lines?
No unless they are already on any of the boards, I just soldered the cables from one board to the other. If needed, what value and where should they be placed?
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Old 28th March 2013, 12:04 PM   #1398
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Quote:
Originally Posted by Jackal29a View Post
No unless they are already on any of the boards, I just soldered the cables from one board to the other. If needed, what value and where should they be placed?
Looking at the Amanero schematics suggests that there are none on the board it self so you will need to add some. I'd suggest trying 1.5k between SCA and +V and between SCL and +V.

I2C is quite fussy and will certainly not work without them.
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Old 28th March 2013, 12:45 PM   #1399
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I think R14 (1.4K) and R15 (1.5K) on the Buffalo II are the pull up resistors. They are in the path of the firmware chip too.

Click the image to open in full size.
(courtesy of Glt)

Last edited by Jackal29a; 28th March 2013 at 12:55 PM.
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Old 28th March 2013, 12:58 PM   #1400
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When I installed my own I2C controller to my Buff II I had to include pull up resistors for it to work. I originally started out with 10k (IIRC) but had to lower them to get it working.

If you have a scope have a look at the wave shape of the lines with and without pull ups and you will soon see if you need them
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