Conditional Compilation

Newzed

I have a program with two variables, dit and dah, which are expressed in milliseconds.· Is the following Conditional Compilation written correctly:

#SELECT $stamp
#CASE BS2, BS2E, BS2PE
· dit = dit */$0100
· dah = dah */$0100
#CASE BS2P
· dit = dit */$03C4
· dah = dah */$03C4
#CASE BS2px
· dit = dit*/$0605
· dah = dah*/$0605
#ENDSELECT

The above snippet tokenized OK.

Thanks

Sid

Jon Williams

The CC construct looks fine.

Question:·Is there any reason to use variables here?· If the Dit and Dah length are designed to be fixed then you could embed those constants into the CC construct -- just a thought if you run short on variable space.

I'm glad to see that someone else is using Conditional Compilation; it's a great tool.

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Jon Williams
Applications Engineer, Parallax

Newzed

I tried using the constants dit and dah first, but got an error message:

Expected label, variable or instruction

so I converted dit and dah from a constant to a variable and it tokenized OK.· I would rather use constants if there is a way.

Sid

Newzed

A bit more explanation.

I wrote dit con 50 and dah con 150, and then tried to use the constants dit and dah in the CC.· That;s when I got the error.

Dit and dah are not fixed constants - they can be varied by the user to generate code speeds of 5 to 25 wpm.

Sid

Tracy Allen

#SELECT $stamp
#CASE BS2, BS2E, BS2PE
BSpeed CON $0100
#CASE BS2P
BSpeed CON $03C4
#CASE BS2px
BSpeed CON $0605
#ENDSELECT

dit = dit */ BSpeed


Sid, you might also need a separate statement for the BS2pe and BS2sx. It depends on which command you are using to create the sound. The PAUSE command is the same (1 millisecond units) on every single Stamp in the lineup, so if you key an external sounder, the different Stamp speeds would be a non-issue. On the other hand, the FREQOUT command has a separate period parameter for each Stamp (except BS2 = BS2e).

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Tracy Allen
www.emesystems.com

Newzed

Thanks, Tracy

That takes care of the dits - what about the dahs?

Would I write dah·= dit * 3

I presume I make dit a constant - dit con 50 - and forget about dah since it defined in the program in terms of dit.

I know about the difference in FREQOUT notes - I just haven't cranked that in yet.

Sid

Tracy Allen

Right, everything can depend on the dit length, including the pause between elements, the character spacing and the word spacing. From what you said earlier, dit (the time duration) will be a variable that will be determined at run time by user preference. Then all the other durations are multiples of that one, and can be computed on the fly.

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Tracy Allen
www.emesystems.com