Comparing different types of variables

Hi, Im trying to compare a WORD with a BYTE. Should that work in PBP? Im using "=>". When the values are actually compared the WORD value is definately less than 256. When i compare 2 BYTE values it works fine but if i change one to a WORD then it stops working.

Im not sure if the problem is with the comparison but it looks most likely. Does anyone know anything about it?

Quote:

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Originally Posted by The Master

Hi, Im trying to compare a WORD with a BYTE. Should that work in PBP? Im using "=>". When the values are actually compared the WORD value is definately less than 256. When i compare 2 BYTE values it works fine but if i change one to a WORD then it stops working.

Im not sure if the problem is with the comparison but it looks most likely. Does anyone know anything about it?

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if word.lowbyte => bytevalue then xxxxxx
or
if word.highbyte => bytevalue then xxxxxx

Don't know why it's not working for you in the first place. It should. Works for me anyways...

Im sure its worked for me in the past too. I had already tried word.byte0/1 but i tried high/lowbyte too and still no luck. The problem i have is that the byte always seems to be less than the word. I just checked it with a status light on and aparently the byte is always 0 because no serial data arrives. The word doesnt have anything to do with serial so ive no idea whats happening there :S

Ill see if i can figure it out. I know its not the compare code now

Ive found where the problem is. I commented all the relative code out then turned it back on 1 line at a time until it broke again.

At the top i have this code

Code:

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cServoOffTime con 255
pServo1 var PORTA.3
vServo1Pos var WORD

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In the interrupt handler for TMR0 i have this code

Code:

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                if vservo1pos>=cservoofftime then
                   
                    pServo1=1
                    vservo1pos=0
                endif

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If i comment out the if statement (not the code in it, just if-then and endif) or i change vServo1Pos to a byte then it works fine. As it is above it stops any serial data from being received. I dont get how that could possibly affect it

Don't know if it'll make ANY difference at all but...

Code:

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                if vservo1pos => cservoofftime then
                    pServo1=1
                    vservo1pos=0
                endif

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Unfortunately not, I already tried that because some languages like PHP dont like it if you put them in the wrong order. PBP doesnt seem to mind though.

Ive been testing a different line of code that does almost the same thing

Code:

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if vservo1pos=>vservo1+12 then

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When i use that code i can send serial data fine for about 5 seconds then it stops. It looks similar to a problem i had the other day but that was because i wasnt resetting a variable back to 0 when i should have. This code shouldnt affect that variable at all though. The PIC doesnt stop running because it still generates the pulse

What happens if you do this:

Code:

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cServoOffTime var WORD
cServoOffTime = 255
pServo1 var PORTA.3
vServo1Pos var WORD
............................................................
                if vservo1pos>=cservoofftime then
                   
                    pServo1=1
                    vservo1pos=0
                endif

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Code:

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if vservo1pos=>vservo1+12 then

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If vservo1 ends up being greater than 65,524, then vservo1 + 12 = 65536, which in a WORD variable ends up equalling ZERO...

vServo1 is a byte and cant go above 255.

I will try declaring cServoOffTime as a variable instead. I think something similar to this was the reason for my thread about the datatypes of constants

That doesnt seem to work either. :(

I just tried removing the constant completely and putting the value into the middle of the code and that works :S. I dont like doing that but in this case i dont really have a choice. The only problem now is the other line. vServo1 gets set by data from the serial port so i cant write the value into the code