After running the code found in :
ftp://ftp.embeddedarm.com/ts-arm-sbc/ts-7250-linux/samples/ adc_72xx.tar.gz
I have
ts7000:/usr/local/epics/tests/adc/adc# ./adc_7250
Calibration Values =
[ 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 ]
Board has been calibrated by Technologic Systems...
Channel 0: 1.558V
Channel 1: 2.506V
Channel 2: 2.506V
Channel 3: 1.874V
Channel 4: 3.449V
With channel 0 grounded to DIO2 of the 40 pin connector.
(http://www.embeddedarm.com/about/resource.php?item=409#section5.1)
How come I don't read 0v!!!
Is it common ground for the ADC? It seems to be for the DI (IN_00 ... IN_05).
Is it my calibration? I can't be believe I would be that far off!
Crosstalk? Well, maybe for channel 1 to 4 but not 0 since it is diretly
grounded.
So what is it?
How come I can't measure 0v?
Also I noted that the ADC range is 0 to 3.3V.
Why not use TTL voltage 0-5v instead?
Is it because the entire system is powered at 3.3v?
Thank you for your insight,
--
Emmanuel
On 16:45 Mon 15 Nov , wrote:
>
> Found some code for the 7250 which appears to be compatible...
> ftp://ftp.embeddedarm.com/ts-arm-sbc/ts-7200-linux/samples/
>
> Do I have to read the ts72xx manual for the ts7370 ?!?!?
> I guess so...
>
> --
> Emmanuel
>
> On 16:03 Mon 15 Nov , wrote:
> > Any sample code?
--
Emmanuel
------------------------------------
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/ts-7000/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://groups.yahoo.com/group/ts-7000/join
(Yahoo! ID required)
<*> To change settings via email:
<*> To unsubscribe from this group, send an email to:
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
|