Post by thread:Byte Craft (MPLABC) to HITECH C compiler

How do you redefine the following from Byte Craft C compiler to HITECH? The HITECH C compiler keeps giving me a "constant expression required" error. char val[10] @ string[32]; // note this resides within string[] char val2[7] @ string[42]; // saved string for 2 variable displays It also does not like this sort of definition. bits special; // special handling, bank max. bits system_flags1; // system flags bits system_flags2; // system flags I looked at the help section but there is not much about what you can and cannot do in regards to C syntax. Thank you, John Bellini spam_OUTjbelliniTakeThisOuTstatpower.com">http://.....jbelliniKILLspam@spam@statpower.com

On Tue, 14 Apr 1998, John Bellini wrote: > How do you redefine the following from Byte Craft C compiler to HITECH? > The HITECH C compiler keeps giving me a "constant expression required" > error. > > char val[10] @ string[32]; // note this resides within string[] > char val2[7] @ string[42]; // saved string for 2 variable displays I would imagine you could do this using proper C with the Hi-Tech compiler by using a union. The Hi-Tech compiler uses "@" to locate variables at specific hardware addresses; that's why you're getting the "constant expected" error -- it's looking for a physical memory address. > It also does not like this sort of definition. > bits special; // special handling, bank max. > bits system_flags1; // system flags > bits system_flags2; // system flags Look at Hi-Tech's "bit" type. > I looked at the help section but there is not much about what you can > and cannot do in regards to C syntax. All of the above is documented in the manual that's on the CD in the "Features and Runtime Environment" section. -- John W. Temples, III || Providing the first public access Internet Gulfnet Kuwait || site in the Arabian Gulf region

MPLAB-C works the same way. For example if you want to store a long and work with the high and low bytes individually you would do this (because MPLAB-C has math trouble with longs): unsigned long a; unsigned char al @ a; // low byte unsigned char ah @ a+1; // high byte These RAM locations are *NOT* reserved. To reserve memory find the line in the PICName.h file (or similar): #pragma memory RAM [MAXB0 - 0x26] @ 0x26; // first 0x25 locations reserved and change it to: #pragma memory RAM [MAXB0 - 0x28] @ 0x28; // reserve two additional bytes Then unsigned long a @ 0x26; unsigned char al @ a; // low byte unsigned char ah @ a+1; // high byte a, al, ah will not be used by the compiler to assign any other variables. rich At 05:00 PM 4/14/98 -0700, you wrote: {Quote hidden}>On Tue, 14 Apr 1998, John Bellini wrote: > >> How do you redefine the following from Byte Craft C compiler to HITECH? >> The HITECH C compiler keeps giving me a "constant expression required" >> error. >> >> char val[10] @ string[32]; // note this resides within string[] >> char val2[7] @ string[42]; // saved string for 2 variable displays > >I would imagine you could do this using proper C with the Hi-Tech >compiler by using a union. The Hi-Tech compiler uses "@" to locate >variables at specific hardware addresses; that's why you're getting the >"constant expected" error -- it's looking for a physical memory address. > >> It also does not like this sort of definition. >> bits special; // special handling, bank max. >> bits system_flags1; // system flags >> bits system_flags2; // system flags > >Look at Hi-Tech's "bit" type. > >> I looked at the help section but there is not much about what you can >> and cannot do in regards to C syntax. > >All of the above is documented in the manual that's on the CD in the >"Features and Runtime Environment" section. > >-- >John W. Temples, III || Providing the first public access Internet >Gulfnet Kuwait || site in the Arabian Gulf region >

On Tue, Apr 14, 1998 at 05:10:14PM -0700, John Bellini wrote: > I am using the demo version of this so I don't have an elaborate help > section that I know of at this time. The full manual is available on our Web site. What I'd suggest though is that instead of just asking "how do I translate this XX compiler feature to HI-TECH", that if you describe the problem you are trying to solve, there may be a better way to do it. -- Clyde Smith-Stubbs | HI-TECH Software Email: clydeKILLspamhtsoft.com | Phone Fax WWW: http://www.htsoft.com/ | USA: (408) 490 2885 (408) 490 2885 PGP: finger .....clydeKILLspam.....htsoft.com | AUS: +61 7 3354 2411 +61 7 3354 2422 --------------------------------------------------------------------------- HI-TECH C: compiling the real world.

John, It looks like you are parsing a string or something that may have arrived via a serial port or similar ... could I suggest you use a pointer to a BYTE .... see below! Use this pointer to then 'point' into your serial port buffer (FIFO) A little note, try these as they are common things. typedef unsigned short WORD; typedef unsigned char BYTE; typedef unsigned long DWORD; typedef unsigned char * STRING; regards, SW. ______________________________ Reply Separator _________________________________ Subject: Byte Craft (MPLABC) to HITECH C compiler Author: pic microcontroller discussion list <EraseMEPICLISTspam_OUTTakeThisOuTMITVMA.MIT.EDU> at INTERNET Date: 14/04/98 16:11 How do you redefine the following from Byte Craft C compiler to HITECH? The HITECH C compiler keeps giving me a "constant expression required" error. char val[10] @ string[32]; // note this resides within string[] char val2[7] @ string[42]; // saved string for 2 variable displays It also does not like this sort of definition. bits special; // special handling, bank max. bits system_flags1; // system flags bits system_flags2; // system flags I looked at the help section but there is not much about what you can and cannot do in regards to C syntax. Thank you, John Bellini jbellinispam_OUTstatpower.com">http://@spam@jbelliniKILLspamstatpower.com

The Byte Craft compiler is the MPC Code Development System not the MPLABC. Patricia Pugliese Byte Craft Limited ---------- {Quote hidden}> From: John Bellini <KILLspamJBelliniKILLspamSTATPOWER.COM> > To: RemoveMEPICLISTTakeThisOuTMITVMA.MIT.EDU > Subject: Byte Craft (MPLABC) to HITECH C compiler > Date: Tuesday, April 14, 1998 6:11 PM > > How do you redefine the following from Byte Craft C compiler to HITECH? > The HITECH C compiler keeps giving me a "constant expression required" > error. > > char val[10] @ string[32]; // note this resides within string[] > char val2[7] @ string[42]; // saved string for 2 variable displays > > > It also does not like this sort of definition. > bits special; // special handling, bank max. > bits system_flags1; // system flags > bits system_flags2; // system flags > > I looked at the help section but there is not much about what you can > and cannot do in regards to C syntax. > > Thank you, > John Bellini > spamBeGonejbellinispamBeGonestatpower.com">http://TakeThisOuTjbelliniEraseMEspam_OUTstatpower.com