Propeller ASM help needed (Got it working)

Bean · 2006-05-09 23:13

Okay I'm trying to blink an LED with assembly.
It will turn on ONE TIME, then turn off and never come on again.
What am I doing wrong ?
Bean.

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Cheap 4-digit LED display with driver IC·www.hc4led.com

COMING SOON "SD DATA LOGGER" www.sddatalogger.com

"I reject your reality, and substitute my own." Mythbusters

Post Edited (Bean (Hitt Consulting)) : 5/9/2006 11:49:52 PM GMT

SSteve · 2006-05-09 23:21

My PropStick hasn't shown up yet, so I can't test anything, but try pasting this much of the program:

                        MOV outa,ONValue                ' Set pin high
                        MOV CntTime,CntDuration         ' Get CntDuration, put in CntTime
                        ADD CntTime,cnt                 ' Add current cnt
                        WAITCNT CntTime,#0              ' Wait awhile                                      
                        MOV outa,OFFValue               ' Set pin low
                        MOV CntTime,CntDuration         ' Get CntDuration, put in CntTime
                        ADD CntTime,cnt                 ' Add current cnt
                        WAITCNT CntTime,#0              ' Wait awhile

right before the JMP statement. That way you'll at least have an idea of which part of the program is failing, the loop or turning the LED back on. If the LED goes on and off twice it's the loop. If it goes on and off once it's a problem turning the LED back on.

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OS-X: because making Unix user-friendly was easier than debugging Windows

Bean · 2006-05-09 23:24

Steve,
· Excellent idea.
· I tried it and it blinks twice. So why doesn't "JMP :again" seem to be working ???
· I tried it without the leading ":" and it doesn't work that way either.

Edit: Found it!!! I needed to use "JMP #:again"

Bean.

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Cheap 4-digit LED display with driver IC·www.hc4led.com

COMING SOON "SD DATA LOGGER" www.sddatalogger.com

"I reject your reality, and substitute my own." Mythbusters

Post Edited (Bean (Hitt Consulting)) : 5/9/2006 11:27:23 PM GMT

SSteve · 2006-05-09 23:29

Should it be "JMP again" instead of "JMP :again"? I'm trying to track down some Propeller asm code to see an example.

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OS-X: because making Unix user-friendly was easier than debugging Windows

SSteve · 2006-05-09 23:33

Here you go: try "JMP #:again". I found it in some example code by Jon.

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OS-X: because making Unix user-friendly was easier than debugging Windows

Jon Williams · 2006-05-10 00:22

If you look at·the attached program you can see that the waitcnt instruction lets you add the span value automatically, saving you a few lines of code.· And let me clarify that this code was written by Chip, not me.

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Jon Williams
Applications Engineer, Parallax

Propeller ASM help needed (Got it working)

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