Displaying a 16 bit integer on PIC 16F877?
 

So, I've been playing around with a 16F877, and I got my hands on one of the kit gyros, and am trying to write my own code for it. I've got it mostly working, but I need to display a 16 bit integer to figure out what constitutes a 90 degree turn. But, the PIC doesn't want to do it. I can't for the life of me get it to output a 16 bit integer (that I can understand) to the debugger using a printf. I've tried %ld, but it didn't give me the right number. Is there some other trick (or formatting) I can use?

Re: Displaying a 16 bit integer on PIC 16F877?
 

%ld is for 32-bit numbers. For a normal int value, just use %d.

Re: Displaying a 16 bit integer on PIC 16F877?
 

More important then knowing the type of PIC is what compiler you are using.

In C18 %ld prints in hex and expects a long (32 bits) while an int is 16 bits
In a compiler for your computer, both an int and a long are 32 bits, and both %d and %ld would print the same thing with both.

Other compilers (especially embedded compilers) will all have small variations like that, that you can only learn about by reading the manual.

Re: Displaying a 16 bit integer on PIC 16F877?
 

I'm using CCS. I ended up solving it by making all of the variables 32 bit integers, which obviously isn't the best solution. I think the problem came when I was doing 8 bit integer math and then set the result equal to a 32 or 16 bit integer. Is there a way to go about doing that?

The piece of code in question was:

angle=angle+instant

Originally, angle was 16 bit integer, and instant was an 8 bit integer. But I couldn't get a useful number, so I changed angle to a 32 bit integer, which I knew I had the syntax right, but it was still a funny number. After I changed instant to a 32 bit number it worked fine. I think I probably have to cast it somehow, but I don't really have a grasp on what casting exactly does, and why it works.

Re: Displaying a 16 bit integer on PIC 16F877?
 

on a side not, you could also have done:
angle+=instant
:p