How many "Var word" variables using a BS2-IC and using the BS2-Pe

Joe

Hi,

Only to know how many "Var Word" variables can I use
with the BS2-IC and how many with the BS2-Pe

I need to use 3 or 4 sensirion sensors and the Basic Stamp 2-IC (BS2-IC)
hasn't enough var word variables.

Thanks , Joe

dandreae

You have 26 bytes size variables (13 words)·for each BASIC Stamp except for the BASIC Stamp 1.

Dave


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Dave Andreae

Tech Support
dandreae@parallax.com
Http://www.parallax.com



Post Edited (Dave Andreae (Parallax)) : 8/18/2006 2:23:56 PM GMT

allanlane5

Yup. The "Variables" are stored in internal registers in the PIC16C57. The 'run-time' library in the BS2 family only knows about those registers. So that's only 26 bytes, total (or 13 words, total). No way to expand them, since the run-time wouldn't 'know' about any expansion.

Having said that, you CAN add an external SPI interfaced eeprom very easily.

Tracy Allen

With the BS2pe, you also have the scratchpad RAM, 127 bytes, so your program can deal with each Sensirion in turn and PUT the resulting temperature and humidity Words there.

FOR channel=0 to 3
  GOSUB Sensirion
  PUT SPtem0+(channel*4), Word temperature
  PUT SPhum0+(channel*4), Word humidity
NEXT

' ---- locations in scrachpad
SPtem0 CON 10
SPhum0 CON 12
SPtem1 CON 14
SPhum1 CON 16
SPtem2 CON 18
SPhum2 CON 20
SPtem3 CON 22
SPhum3 CON 24

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Tracy Allen
www.emesystems.com