10/10 is 1..... right?

CannibalRobotics

I have this little snippet of SPIN that is misbehaving. For all values of 'val' between 0 and 99, the value that arrives in cf.drawlevel is an integer truncated·val/10 which is correct, ie. if Val = 40 going in, the Val arriving is 40/10 or 4. This works fine for everything except 10.
If the value coming in through SingVol is Val=10, the arrival data·at cf.drawlevel 10 also?
10/10 is 1 right?

Pub SingVol(Chan,Val)  '' Sets volume in I2C format and updates displays     
        SetVol(Chan,Val)    
        cb.SetControl(44 + Chan,Val)
        val := val / 10            
        cf.drawlevel(val)

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Mike Green

Yes, 10/10 is 1. You'll have to look elsewhere for your problem.

CannibalRobotics

Thanks Mike! LOL
Any other suggestions?

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sylvie369

Does val = Val ?

bill190

What helps me the most with problem like this is to "see" what is going on.

Display what the values are at various points. See what is happening to a variable at different points.

For the propeller, I use the FullDuplexSerial object to display values on the Parallax serial terminal.

Might want to search these forums to read more about using that object. But here are the "ingredients"...

A fast clock speed...

CON
· _xinfreq = 5_000_000····················
· _clkmode = xtal1 + pll16x

Include the object and rename it to "Debug"...

OBJ
· Debug : "FullDuplexSerial"

Start the object by placing this·in the PUB section...

Debug.start(31, 30, 0, 115200)

Then you can display things on the terminal like this...

Debug.str(string("Hi There!"))

Display the value in decimal of the variable tenthsec...
Debug.dec(tenthsec)

Carrage return...
Debug.tx(Debug#CR)

Load the program to EEPROM,·get your serial terminal up and click on enable, set the baud to 115200.

Then click reset on the propeller.

Cluso99

If you have a prop pin to spare and a TV (or monitor) with video input (yellow RCA) you can also use my Debug_1pinTV and use the same idea for displaying variables as bill suggests, but on the TV. See the obex under tools debug..

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CannibalRobotics

Well, it works but I'm still stumped. So I changed

Pub SingVol(Chan,val) '' Sets volume in I2C format and updates displays     
        SetVol(Chan,val)    
        cb.SetControl(44 + Chan,val)
        val := val/10         
        cf.drawlevel(val)
        

To

Pub SingVol(Chan,val) '' Sets volume in I2C format and updates displays     
        SetVol(Chan,val)    
        cb.SetControl(44 + Chan,val) 
        cf.drawlevel(val)

and

PUB DrawLevel(Level)
  
 case Level
  0:...   

to

PUB DrawLevel(Level)
  Level := Level/10
  
 case Level
  0:...   

·And it works. Seems to me that moving this operation from one cog to another should not change the outcome of the math?


PS: There is a 'debug' statement at the end of the 'case' showing me what the value is.

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Post Edited (CannibalRobotics) : 5/5/2010 9:47:52 PM GMT

lonesock

I'm guessing something is stepping on the memory where 'val' lives in the 1st cog, and that it happens during the time it would have taken to parse and execute the /10 command. try executing a waitcnt delay in place of the /10 line?

Jonathan

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lonesock
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