topic IF statement Oddity (seems to me) in Classic/Legacy CodeWarrior

IF statement Oddity (seems to me)

UtopiaTim — Fri, 17 Jul 2009 10:02:21 GMT

Hi Folks,

I have a completed a couple of projects written in C, and I've come across something that

seems to be a bit strange to me.

I'm sure that it's probably something simple, but here goes.

This is what I would like to do:

unsigned char data;

if (data == 0x0b){
inhibit = 0;
}

Pretty simple. If a location called 'data' is = to $0b, then make inhibit 0.

It doesn't <always> work. I usually end up doing !=, then changing the

structure of the way the routine works.

I've seen this on the JM60 & QG8 versions of CW. I'm using 6.1 currently.

Thanks,

Tim

Re: IF statement Oddity (seems to me)

bigmac — Fri, 17 Jul 2009 10:31:54 GMT

Hello Tim,

You do not say whether data is a local variable or a global variable. If a global variable, can the variable be written via an ISR? If so, the variable definition should include the volatile modifier.

Regards,

Mac

Re: IF statement Oddity (seems to me)

UtopiaTim — Fri, 17 Jul 2009 10:40:48 GMT

Hi Mac,

Thanks for the reply.

Right now, I'm writing the code as a single module, and there are

no interrupts. (it's a very simple project).

Tim