Max5250 DAC - “bit gluing”

Tom_005

I have a MAX5250 Low-Power, Quad, 10-Bit Voltage-Output DAC with Serial Interface. A nice article was done in Nuts and Volts Column #59, March 2000 by Lon Glazner:
A Digital-to-Analog Converter for All Seasons. This is where I drew I inspiration on how to achieve my goal. The article was written for the BS2 not the Prop.

My confusion is How do I paste together the 16 bit word?

I understand the first 4 bits contains the address and control; the next 10 bits are my value for voltage, and then 2 addition bits that don’t matter to my case.

I can send a word hard coded and the chip responds no problem.

But I can not figure out how to “glue” the bits together so I can change my voltage value programmaticaly.
Here is a non-programmatic example of what I am trying to achieve.

adct=%0011

Vdata= %0000011111

So=%00

Wordtosend=(adct)+(Vdata)+(So)

Any advice, or direction on where to look for a method on how to do this “bit gluing” would be appreciated,
Thanks

Beau Schwabe

Tom_005,
If your wanting to do this for a Propeller, then this would work...

[b]CON[/b]
adct = %0011    'Address and Control
So = %00        'Don't Care Bits

[b]VAR[/b]
word     Vdata, Wordtosend

[b]PUB[/b] Demonstration
    Vdata := %0000011111
    Wordtosend := adct<<12 + Vdata<<2 + So

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Beau Schwabe

IC Layout Engineer
Parallax, Inc.

Post Edited (Beau Schwabe (Parallax)) : 11/26/2008 4:56:41 PM GMT