Post by thread:MPASM workings and an intro

Greeting's Y'all, How does MPASM interpret the following ADDWF AD12H, 1 Specifically the AD12H, which is both a valid hexadecimal number, and a symbol? Does it see if it's in the symbol table, and use the number if it's not? Or something else? The reason I ask is that I'm writing a PIC assembler for Linux, and am trying to emulate MPASM behaviour as much as possible. I've just finished the parser, and am now about to code the symbol table and expression evaluator. Does anyone know what happened to the GPASM project? Its seemed to have disappeared. Finally, since this is my first posting to the list, I'l tell a little about myself. As the .sig suggests, I am studying aerospace engineering, and play around with PICs when I find the time. My main interest lies in rocketry/aerospace applications, and no doubt a few of you will recognize my name from the arocket list, where I lurk. Thanks a lot, -- Jason Langenauer Mechanical and Space Enginnering, The University of Queensland -- Lady Astor: If you were my husband, I'd poison you drink. Winston Churchill : If I was your husband, I'd drink it.

|How does MPASM interpret the following | ADDWF AD12H, 1 |Specifically the AD12H, which is both a valid hexadecimal number, and a symbol? |Does it see if it's in the symbol table, and use the number if it's not? Or |something else? As far as I recall, assemblers (in general) will interpret anything starting with a character as a string (which could of course be a reserved word, such as an assembly mnemonic). Thus, your example would be interpreted as an identifier. It is generally required to precede a hexadecimal number with an identifier, specifically to avoid this ambiguity. This can be 0x, H, or even a zero (e.g. write the number as 0AD12H). Let me try it real quick..... Ok, as suspected, AD12H is an identifier, and 0AD12H is a number (out of range, btw). Phil Eisermann H:(440) 284-3787 (spam_OUTmazerTakeThisOuTix.netcom.com) O:(440) 329-4680 (.....peisermaKILLspam@spam@ridgid.com)

Jason Langenauer wrote: <snip> > Does anyone know what happened to the GPASM project? Its seemed to have > disappeared. As posted on the GnuPIC list: Subject: [GNUPIC] gpasm web page Date: Mon, 11 Oct 1999 08:13:53 -0700 (PDT) From: Scott Dattalo <sdattaloKILLspamunix.sri.com> Reply-To: .....gnupicKILLspam.....cichlid.com To: EraseMEgnupicspam_OUTTakeThisOuTcichlid.com As many of you probably know, James Bowman's (the original author of gpasm) web pages at SGI have been 404'd. I had managed to wget the gnupic project pages, but I did not get the gpasm page. Oh well. So I created a new gpasm page: http://www.interstice.com/~sdattalo/gnupic/gpasm.html If anyone wishes to add info to this page or change it any way then let me know. Regards, Scott ------------------------------ Another page worth looking into is http://huizen.dds.nl/~gnupic/ Quite a bit of Linux based stuff there. -- Mike Werner KA8YSD | "Where do you want to go today?" ICQ# 12934898 | "As far from Redmond as possible!" '91 GS500E | Morgantown WV | Only dead fish go with the flow.

Hi, from MPAMS's point of view, AD12H is not a valid hexadecimal number. Only either h'AD12' or 0xAD12 would be... Another assemblers (e. g. CVASM) think differently: AD12H is a symbol. To make it to a hex number, prepend a zero, as 0AD12h Regards, Imre On Sat, 16 Oct 1999, Jason Langenauer wrote: {Quote hidden}> Greeting's Y'all, > > How does MPASM interpret the following > > ADDWF AD12H, 1 > > Specifically the AD12H, which is both a valid hexadecimal number, and a symbol ? > Does it see if it's in the symbol table, and use the number if it's not? Or > something else? > > The reason I ask is that I'm writing a PIC assembler for Linux, and am trying > to emulate MPASM behaviour as much as possible. I've just finished the parser, > and am now about to code the symbol table and expression evaluator. > > Does anyone know what happened to the GPASM project? Its seemed to have > disappeared. > > Finally, since this is my first posting to the list, I'l tell a little about > myself. As the .sig suggests, I am studying aerospace engineering, and play > around with PICs when I find the time. My main interest lies in > rocketry/aerospace applications, and no doubt a few of you will recognize my > name from the arocket list, where I lurk. > > Thanks a lot, > > -- > Jason Langenauer > Mechanical and Space Enginnering, The University of Queensland > -- > Lady Astor: If you were my husband, I'd poison you drink. > Winston Churchill : If I was your husband, I'd drink it. > >