Jim Jackson wrote:
>On Wed, 1 Nov 2006, Per-Olof wrote:
>
>
>>Then I might comment your answer. I have checked the ts website,
>>www.embeddedarm.com, and they have demo code for the internal adc. If
>>you are aware of the TS code for Optional mounted MAX 197, I would to be
>>pleased for that link or information. What I found on TS page is: EP9301
>>on-board A/D converter sample code
>><http://www.embeddedarm.com/downloads/samplecode/adc_72xx.tar.gz>
>>(04-17-2006) however that does not help me in the end to get all 12
>>bits of the external ADC.
>>
>>
>
>Sorry but it's as simple as RTFM. It's in the ts7200 manual - "single
>sample acquisition procedure" under the A/D Converter sections.
>
>The same manual entry also says "The conversion result is now available
>at locations 0x10C0_0000 (LSB) and 0x10C0_0001 (MSB). A single word read
>at 0x10C0_0000 can also be used." Howver this is from the Preliminary
>TS-7200 DRAFT manual. I bought my board within a month of so of
>Technologics releasing the product, back in 2004.
>
>
>Being essentially pragmatic, I coded as per the manual - got the results I
>expected and have never checked the schematic in this area. However
>schematics are produced by humans (there were faults in other areas), and
>I believe Technologics do not claim the schematics is 100% complete - it
>is there to give enough information to enable people to interface to the
>product.
>
>
Ok, that was a releif, however a normal process would be that a scematic
directly reflect the
PCB when a normal designtool is used. I did not find the MSB signal on
the Cirrus (or any
other circuit) I was woundering if the board was only supporting the 8
bits (not all 12) or if the
MAX circuit was used in other way than described (then curisous).
However the shematics shows
the HBEN is not wired and would then be wrong.. Im not able to check the
board because it is mounten
in the housing, as well as I had to know if the optional AD would do the
job.
>I would why you are so worried by it? Have you used code to read the
>values and found that you didn't get 12bits? Maybe your code was wrong?
>
>
No, I have not tested the code yet, because the Optional AD is not
mounted yet. However you have
convinced me that it sould work so I will go ahead and insert the AD and
test the IO locations.
>I suspect only Technologics staff can answer your specific
>internals questions.
>
>
Sure, would be interesting to know the annotation between the schematic
drawing and the PCB cad.
ps. Tanks for comments and code examples.. You are a great team here..
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