In SX Microcontrollers, SX/B Compiler and SX-Key Tool, fiveslo wrote:

JonnyMac:
After I substituted the code that you suggested:

 



[code]SUB AD_READ:
  LOW ADcs
  adChan = adChan << 8
  SHIFTOUT SDO, SClk, MSBFIRST, adChan\12
  SHIFTIN  SDI, SClk, MSBPRE, result\12 
  HIGH ADcs 

  tmpW1 = result ** 14464
  result = result + tmpW1
  ENDSUB[/code]

 I get a "Error 11, BYTE VARIABLE EXPECTED "result"  on the line, 

SHIFTIN  SDI, SClk, MSBPRE, result\12 . I scanned thru the help file of SX/B and found something which caught my eye, that being the \COUNT parameter of SHIFTIN and SHIFTOUT, ranges from 1-8, is this true or was this an update when WORD VARs were added to SX/B?  In any case I substituted as I think you suggested:

 



[code]
SHIFTIN sdi,sclk,MSBPRE,result_MSB\4          ' get result, 12 bits
SHIFTIN sdi,sclk,MSBPRE,result_LSB 
[/code]

What I see in the watch window is a 12bit result, yet kind of weird... in the case that the range goes from

0 to +2048, and when +2048 rolls over it changes to -2048 and goes back down to 0 counting the whole way negatively.. does that make sense??  I'm seeing the 0-4095 range however, not in a 0-4095 way, rather in a 0-2048 then -2048-0... is my WATCH statement responsible for this... 



[code]WATCH   result,12,SDEC[/code]

 

I'm guessing yes, if so how do I fix this???  As for the code:

 



[code]

tmpW1 = result ** 14464
result = result + tmpW1 

 
[/code]
will this work with the result_LSB and result_MSB mods to result?  Reason I ask is this part after my _LSB and _MSB mods didn't make the compiler happy... I've posted my refined but still not working code below...  Thanks again for your input.. Rob

 



[code]Start:
  HIGH ADcs                                     ' make CS output
  LOW sclk                                      ' make clock 0-1-0
[code]Main:
  DO 
    LOW ADcs                                ' select chip
    ADch=$b                                 ' make dummy conversion to intialize converter
    GOSUB ADread
    ADch=0                                  ' acquire TLC2543 channel 0
    GOSUB ADread
    BREAK()                                 ' update result variable in watch window
    LOOP
    END


[code]ADread:
  LOW ADcs
  ADch=ADch<<8
  
[code]SHIFTOUT sdo,sclk,MSBFIRST,ADch\12        ' Can the \COUNT be greater than 8, instructions for SX/B say no!
  'SHIFTIN sdi,sclk,MSBPRE,result\12        ' <--- Error 11, BYTE VARIABLE EXPECTED "result"  COMPILER GENERATED ERROR!
  
[code]  SHIFTIN sdi,sclk,MSBPRE,result_MSB\4          ' get result, 12 bits
  SHIFTIN sdi,sclk,MSBPRE,result_LSB
  HIGH ADcs                                    ' deselect chip
[code]  RETURN 
[code] [/code]

---------- End of Message ----------


You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=183991#m184196

Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com

The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2007 (http://www.dotNetBB.com)