Post by thread:[PIC]: Mchip assembler syntax

Ok, on another subject, what's the syntax (if any) for conditional assembly, in the more complicated cases? The simple case is fine, like this: if X stuff else other stuff endif However, I'd like to do something more complex, like: if x or y and not z stuff else if z and y other stuff else.... many other stuffs.... endif -- Where's dave? http://www.findu.com/cgi-bin/find.cgi?kc6ete-9 -- http://www.piclist.com hint: To leave the PICList spam_OUTpiclist-unsubscribe-requestTakeThisOuTmitvma.mit.edu

David VanHorn <.....PICLISTKILLspam@spam@MITVMA.MIT.EDU> wrote: > what's the syntax (if any) for conditional assembly > .... > if x or y and not z > stuff > else > if z and y > other stuff > else.... > many other stuffs.... > endif Dave: if (x || y && !z) stuff else if (z && y) other stuff else .... endif endif Generally speaking, it's best to put parentheses around each of your arguments; I left them out for clarity. Also, it's a lot easier to do this sort of thing if you can get rid of the "elses". In your example, for instance, "x or y and not z" and "z and y" are mutually exclusive, so you could rewrite the code as: if (x || y && !z) stuff endif if (z && y) other stuff endif This is all in the MPASM manual, by the way... -Andy === Andrew Warren - fastfwdKILLspamix.netcom.com === Fast Forward Engineering - San Diego, California === http://www.geocities.com/SiliconValley/2499 -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

> >Also, it's a lot easier to do this sort of thing if you can get rid >of the "elses". In your example, for instance, "x or y and not z" >and "z and y" are mutually exclusive, so you could rewrite the code >as: That was just a quick hack to get the point across. >This is all in the MPASM manual, by the way.. Is this a separate doc? I looked in the help file, but didn't find it. Thanks. -- Where's dave? http://www.findu.com/cgi-bin/find.cgi?kc6ete-9 -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

David VanHorn <.....PICLISTKILLspam.....MITVMA.MIT.EDU> wrote: > > Also, it's a lot easier to do this sort of thing if you can get > > rid of the "elses". In your example, for instance, "x or y and > > not z" and "z and y" are mutually exclusive.... > > That was just a quick hack to get the point across. Yeah, but it's STILL always better if you can get rid of the "else" directives. Nested "ifs" are hard enough to debug; nested "if/elses" are nearly impossible. > > This is all in the MPASM manual, by the way.. > > Is this a separate doc? I looked in the help file, but didn't find it. Have you ever found ANYTHING useful in the MPASM help file? The MPASM User's Guide is a 284-page document available in PDF format from the Microchip web site; if you don't have it already, it's at: www.microchip.com/Download/Tools/PICmicro /DevEnv/MPLABi/ Software/manual/51025d.pdf (You'll have to cut-and-paste that into one line for your browser.) -Andy === Andrew Warren --- EraseMEaiwspam_OUTTakeThisOuTcypress.com === Staff Systems Engineer, IPD === Cypress Semiconductor Corporation === === Opinions expressed above do not === necessarily represent those of === Cypress Semiconductor Corporation. -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

Download the microchip assembler manual from them. The conditional can be expressed mostly like a C expression with some range exceptions. Peter -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.