Real fast - simpl syntax

Philldapill · 2008-01-05 00:42

I have a loop that keeps repeating...

· repeat
··· if condition is satisfied
····· break out of loop and continue
· continuing code...

How do I break out of the loop? In C, it would just be "break" or "return" in the case of returning from the function, but in this case I just want to continue.

Paul Baker · 2008-01-05 00:45

The command you are looking for is QUIT

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Paul Baker
Propeller Applications Engineer

Parallax, Inc.

BTX · 2008-01-05 00:49

Or.
Repeat until "condition is satisfied"

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Regards.

Alberto.

Philldapill · 2008-01-05 00:49

THANK YOU! Now, another thing... I THINK I've stored a string of characters in a byte array... "KeyName[noparse][[/noparse]16]" being the name with a max length of 16 characters. How do I convert it to a string that I can put on the TV?

Mike Green · 2008-01-05 00:54

Most of the routines that handle strings assume a C-type string using a zero byte at the end. Most of the display drivers (and serial I/O driver) have a subroutine called "str" which is passed the address of a C-type string and displays it on the display. You would call "display.str(@KeyName)" where "display" is the name of the object used as a display driver. Have a look at the source code for "tv_text.spin" (included with the Propeller Tool) for example and you'll see that routine and several others that convert numbers to decimal / hexadecimal / binary form for display.

You could also do
repeat i from 0 to 15
·· display.out(KeyName[noparse][[/noparse] i ])

Post Edited (Mike Green) : 1/5/2008 12:59:08 AM GMT

BTX · 2008-01-05 00:55

Correct me please, if I'm wrong:

Repeat i from 0 to 16
tv.str(string(KeyName))

Seems to not appear the KeyName[noparse][[/noparse]/code]

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Regards.

Alberto.

Paul Baker · 2008-01-05 00:56

The easiest method is to place a 0 value immediately following the array (or if the field is < 16 characters making sure the strlen+1 contains a 0), then use the str method of your TV text driver.

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Paul Baker
Propeller Applications Engineer

Parallax, Inc.

BTX · 2008-01-05 00:58

Sorry something is wrong with my explorer...can't show brackets for the array

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Regards.

Alberto.

Paul Baker · 2008-01-05 01:07

You have to place spaces before and after the brackets, [noparse][[/noparse] i ] when written without spaces is interpreted by the forums as italic.

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Paul Baker
Propeller Applications Engineer

Parallax, Inc.

Philldapill · 2008-01-05 01:10

Thanks guys... New problem(well, sorta). What I'm ultimately doing, is reading the command from a tv remote, and displaying the corresponding key name(like "mute" or "Left Arrow") on the TV screen. I have a lookup table that is MaxKeys in length(KeyID[noparse]/noparse]MaxKeys] as a variable). Each KeyID stores a particular code, such as 00002B14, in it. Then, I WANT to have a second lookup table named "KeyName[noparse][[/noparse" which would store strings. If this is anything like C, I would have to have MaxKeys number of "KeyName" variables, with each KeyName storing a string of 16 characters max. Now, HOW do I do that with spin syntax?

Philldapill · 2008-01-05 01:15

Grrrr, one more thing. In the "case", if you have many different cases, but want a default case, how do you implement it? Again, in C, it would just be Default:

Paul Baker · 2008-01-05 01:20

VAR
   long KeyName[noparse][[/noparse]MaxKeys * 17]

17 so that you have space for the 0 termination, the 3rd letter of the 2nd field would be KeyName[noparse][[/noparse]1*17 + 2] (arrays start with 0 index, so each component of the index (record # and offset)·are subtracted by 1)

other: is the default case (this information is in the manual)

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Paul Baker
Propeller Applications Engineer

Parallax, Inc.

Philldapill · 2008-01-05 01:24

Thanks Paul, but I prefer to let other people do the dirty work for me which let's me ride on other's shoulders, thereby making me look good!(kidding of course) I need to break out the manual I guess and relearn it. Thanks again guys!

deSilva · 2008-01-05 02:19

Philldapill said...
... thereby making me look good!

You need not fear for that

said...
I need to break out the manual I guess and relearn it.

There is a much underrated thing in the HELP menu: "Quick Reference". This is "SPIN on a Page"! Browsing through it from time to time will soon expand your knowlege of SPIN!

Post Edited (deSilva) : 1/5/2008 2:29:22 AM GMT

Paul Baker · 2008-01-05 02:19

There's a command which you may find helpful in your app, lookdownz provides a faster method to do content searching (give a value get an index back), used in conjunction with your array you can do·an arbitrary index array (and array whose indices are any vaue). So lets say your remote has 3 buttons (POWER, PLAY and STOP), and thier codes are 4B, 7C and 7F, you can display the string with this line of code:

·tvtext.str(KeyName[noparse][[/noparse]17 * lookdownz(code : $4B, $7C, $7F)])

code is the code value that you are displaying the name for, KeyName contains the string POWER starting at index 0, PLAY starting at index 17 and STOP at index 34, all other values in KeyName are 0. The effect of this code is to make an array whose indicies are $4B, $7C and $7F

If you want to get even "spiffier" you can use variable length strings using a combo lookup and lookdown:

OBJ
  tvtxt : "TV_Text"
 
PUB Main | code
  ...
  code := ...
  ...
  tvtxt.str(lookup(lookdown(code : $4B, $7C, $7F) : @pwrstr, @playstr, @stopstr))
 
 
DAT
pwrstr BYTE "POWER", 0
playstr BYTE "PLAY", 0
stopstr BYTE "STOP", 0

Pretty cool huh?

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Paul Baker
Propeller Applications Engineer

Parallax, Inc.

Post Edited (Paul Baker (Parallax)) : 1/5/2008 2:29:27 AM GMT

deSilva · 2008-01-05 02:24

BTX said...
Correct me please, if I'm wrong:
Repeat i from 0 to 16
tv.str(string(KeyName[noparse][[/noparse] i ])

Have you tried it? Of course not

"string" is no command but a "directive"; it instructs the compiler to allocate some space preset by CONSTANTs only.

The classical program to output a string is

PRI outputstring(theStringAddress)|c
 REPEAT WHILE (c := BYTE[noparse][[/noparse]theStringAddress++])
       out(c)

Philldapill · 2008-01-05 02:28

Thank you desilva. I understand why the string must be "zero terminated"... so that C results in being false, stopping the while loop. I love this chip!(Just thought I'd get that out in the open and profess it)

Philldapill · 2008-01-05 02:35

Oh, Paul, this is totally off topic, but any idea what kind of price range a Prop II protoboard would run? I can't wait.

Paul Baker · 2008-01-05 02:39

no I don't

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Paul Baker
Propeller Applications Engineer

Parallax, Inc.

deSilva · 2008-01-05 02:41

Last time he said: "...considerably more"

Paul Baker · 2008-01-05 02:44

Thats a bit of a misquote, that was describing the difference in price for a propstick like format vs protoboard.

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Paul Baker
Propeller Applications Engineer

Parallax, Inc.

deSilva · 2008-01-05 02:52

I couldn't resist...
Negroponte says the OLPC notebook will be $80 end of this year

Philldapill · 2008-01-05 02:58

Sorry, what's the OLPC notebook you speak of desilva?

Phil Pilgrim (PhiPi) · 2008-01-05 03:10

Long thread, short postings.
What is the topic again?
Winter wind rambles.

My haiku for the day.

-Phil

deSilva · 2008-01-05 03:22

5-7-5
Well done, Phil!

... and you even did't forget the reference to nature and season

Post Edited (deSilva) : 1/5/2008 6:19:29 PM GMT

Real fast - simpl syntax

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