Control a Radio PLL with a PIC

[cncmachineguy]

well let me say I think its the more complicated way, but hey that makes it more fun. I would guess you will have to read the count on the selector, compare it to the last count, If it is higher, add 1 to the freq, if its less subtract. To cross the zero, you will have 2 choices when at 0 of at $F. from o you will go to 1 or $F, and from $F you will go to 0 or $E. So just check for that when you get to those counts.

I would think you will have to really spin the selector VERY fast to miss any counts, so I would start with that scheme and see how it works. Don't forget you may need to de-bounce the inputs.

[RayL113]

Thanks Bert. Should I use the IF...THEN string? Something like this;
Start
PEEK CHSEL CHSELVAR
IF CHSEL = 0000 THEN CHECK0
IF CHSEL = 1111 THEN CHECK1
ELSE LOOP

LOOP
PEEK CHSEL CHSELVAR
If CHSEL > CHSELVAR Then UP
Else
PEEK CHSEL CHSELVAR
IF CHSEL < CHSELVAR Then DOWN
Else
GOTO Start

UP
PLLDATA = PLLDATA +1
MOVLF PLLDATA PLLDATAOUT
GOTO Start

DOWN
PLLDATA = PLLDATA -1
MOVLF PLLDATA PLLDATAOUT
GOTO Start

CHECK0
IF CHVAR = 0001 THEN UP
IF CHVAR = 1111 THEN DOWN
ELSE LOOP

CHECK1
IF CHVAR = 0000 THEN UP
IF CHVAR = 1110 THEN DOWN
ELSE LOOP

Of course I didn't include all the defines. Am I on the right track?

[cncmachineguy]

Seems like the basic idea. Not sure what language that is but the idea looks about right

[RayL113]

Seems like the basic idea. Not sure what language that is but the idea looks about right

Uh Oh. Thought it was PBP. What did I do wrong?

[cncmachineguy]

Ray, I stand corrected. I was thinking peek came from a different language, but I see it is a valid pbp command, though according to the book not recommended.

As for the movelf, well I think that is some ask haunting you. In pbp you would just use

plldataout =plldata

So yes I still think that's the basic idea.
Oh yea, loop is a reserved word in latest release of pbp, so not a good choice for your label.

[RayL113]

Yes, I corrected that. Thanks.
Where do I find the reserved words? Looked through the manual. Couldn't find them.

[cncmachineguy]

can't answer that one, I must say I have ony read it here MANY times, so I assume it to be true. I think it might be in the front or the back in a section talking about differences from previous versions or differences from BS2. Not sure.

[rsocor01]

Where do I find the reserved words? Looked through the manual. Couldn't find them.

Look in appendix C in your manual.

http://melabs.com/resources/pbpmanual/