How to put lowbyte of a Word to a Byte variable?

basicstampede

BS2 code:

rawValue VAR Word
ledValue VAR Byte
ledValue = rawValue.lowbyte·

How do I do the line

ledValue = rawValue.lowbyte

in SX/B?

That is, all I want is the lowbyte of a Word variable and store it into a Byte (so I can display it to 8 LEDs).

Thanks.

RS_Jim

try this:

rawVal· VAR tmpW1

ledVal· VAR tmpB1

ledVal = rawVal_lsb

Radio Shack Jim

basicstampede

Radio Shack Jim, thanks a lot.· That works!!!

Excerpt from my code:

LEDs PIN RC OUTPUT

tmpW1 VAR Word
tmpB1 VAR Byte
rawValue VAR tmpW1
ledValue VAR tmpB1

IF rawValue > 255 THEN
··· ledValue = 255
· ELSE
··· ledValue = rawValue_lsb
· ENDIF
·
· LEDs = ledValue


Where did you find out about the _lsb operator?· I've searched the Help Index, but don't find it there.·

And what others are there?· e.g.

Which of these would be allowed:

rawValue_msb
rawValue_lownib(0)
rawValue_lownib(1)
rawValue_lownib(2) etc.
·

Bean

SX/B does not have nibble variables. So no those won't work.

Bean.

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·

basicstampede

Thanks Bean.·

I wonder where Radio Shack Jim found about the _lsb operator?

I don't see any mention of it anywhere.

JonnyMac

On page 109 of the early released material from "Practical SX/B" you'll find: "When defining words like this the compiler also provides aliases for the low- and high-bytes of the word, in this case those aliases would be tmpSetting_LSB and tmpSetting_MSB."

I'll make sure that the creation of _LSB and _MSB aliases makes it into the help file as well.

You can learn a great deal about SX/B by looking through a list file of a compiled program; you can do it in the editor by pressing Ctrl-L; this will show you all the internal variables, constants, and how your variables are organized (including automatic aliases) and how you code compiles. SX/B takes a bit more work than the BS2, and there's not as much material yet for spoon feeding, but the effort is worth it with the power you gain from using the SX.

Post Edited (JonnyMac) : 8/29/2008 8:03:47 PM GMT