Post by thread:[PIC]: MPLAB C18

I feel like I am talking to myself here, it seems that there are no MPLAB C18 users on this list, but I will give it one last chance. I have been struggling with the compiler and I have couple of questions, please help if you know anything: 1. How do you set the configuration bits programmatically? 2. How do you write and read to eeprom (I tried "rom long eTest = 0x1234;" but that does not seem to work, although I get no compiler warnings/errors) 3. How do you define default values in the eeprom in C? In asm I just write (org 0x2100 de "testing",0) 4. Sometimes, after I have the hex file without any compaints from the compiler, I load it to the programmer (P16PRO, and load the hex file, and I get "Checksum error in object file". Could this be because I don't have the configuration bits in the hex file? If so, how come I don't get this error all the time? The pic used is: 18F452 at 20Mhz. Please help if you know anything or at least where to get help about the C18. Regards, Omer YALHI spam_OUToyalhiTakeThisOuTteksan.com.tr http://www.teksan.com.tr Tel : +90 212 613 22 00 Fax: +90 212 544 70 35 -- http://www.piclist.com hint: To leave the PICList .....piclist-unsubscribe-requestKILLspam@spam@mitvma.mit.edu

Although I have downloaded the demo, I have yet to use MPLAB C18, but my current 'C' compiler requires a double underscore for config info as in #__config or #pragma __config with either #__config 0x3F72 or #__config _XT_OSC | _WDT_NORMAL etc To persuade data into EEPROM at compile time requires for my compiler #asm _savePC=$ org 0x2100 DATA 'Y','E','S' ;or '0x59','0x45','0x53'= YES org _savePC #asmend -- _savePC= is needed by my compiler otherwise it becomes confused and sulks. I await angry shouting from others. colin cdb, bodgy1KILLspamoptusnet.com.au on 14/08/2002 -- http://www.piclist.com hint: To leave the PICList .....piclist-unsubscribe-requestKILLspam.....mitvma.mit.edu

I am also using C18 compiler. I found another issue: it seems that the C18 stores "const" variables both at the program memory and data memory. Do you know how to select banks using "pragma varlocate"? thanks in advance! Luke {Original Message removed}

Nope, doesn't work that way. How come they did not put this on the manual? I searched everywhere! If they did put it, then they have made a very good job of hiding it. Thanks for the help though, Ömer YALHI EraseMEoyalhispam_OUTTakeThisOuTteksan.com.tr http://www.teksan.com.tr Tel : +90 212 613 22 00 Fax: +90 212 544 70 35 {Original Message removed}

You can find C18 users on the Microchip development tools webboard. Point your browser at: http://asp.microchip.com/webboard/wbpx.dll/~devtools The fuses on the F18xxx MCU are set by including in-line assembler, using the __Config directive (note there are 2 underscores in __Config). There is a discussion on this topic up on the webboard. There is an additional parameter to __Config in the PIC 18Fxxx series. It is defined as: __Config mem_addr, config_bits The fuse addresses and bit maps are defined in the corresponding P18Fxxx.inc file. For example, the OCS fuse settings might look like: __CONFIG _CONFIG1H, _OSCS_OFF_1H & _HSPLL_OSC_1H Sorry that I cannot help with your other questions. I'm still learning how to use MPASM. C will have to wait for a while. Regards, Jim {Original Message removed}

I don't need any bank selection yet, so I have not looked into it. With IAR C you have to declare the variables with banks and then you can forget about them when using, bank changing is done automatically. I assumed it would be the same case with C18, isn't that so? Ömer YALHI oyalhispam_OUTteksan.com.tr http://www.teksan.com.tr Tel : +90 212 613 22 00 Fax: +90 212 544 70 35 {Original Message removed}

Jim, Thank you for the help, although I cannot use the __config command with the C compiler (yet!) for some reason, the webboard is definetly a big help. I appriciate it, Ömer YALHI @spam@oyalhiKILLspamteksan.com.tr http://www.teksan.com.tr Tel : +90 212 613 22 00 Fax: +90 212 544 70 35 {Original Message removed}

I cannot see it is in the generated assembly language because I use its generated assembly code to check the C18 compiler. Luke {Original Message removed}

> I feel like I am talking to myself here, it seems that there are no > MPLAB C18 users on this list, but I will give it one last chance. I use CCS, so I can't help with C18 specifics. However... > 1. How do you set the configuration bits programmatically? CCS uses a pragma called #FUSES - you might want to check your manual for "fuses" - you might be missing it looking for "configuration bits". That said, I suspect it is instead going to be a syntax variation on responses you've already gotten. There must have been example C files included with the compiler - you can usually figure this kind of stuff out from those even if it's not clear or seems to be missing from the manual. > 2. How do you write and read to eeprom (I tried > "rom long eTest = 0x1234;" but that does not seem to work, although I > get no compiler warnings/errors) eeprom and rom are not the same! If you can do inline assembly, just use the short routines in the 18F data sheet for reading and writing to eeprom - they work just fine. The "rom" directive is like const - it forces a variable into program memory (NOT eeprom). I know this much about C18 from the CD I got from the masters. Couldn't find anything on initializing eeprom data. There are undoubtedly library functions for doing this - they will be along the lines of: x = read_eeprom(3); try looking for something similar. Try searching through all the .h files for the string "eeprom" to find the prototype. > 3. How do you define default values in the eeprom in C? In asm I just > write (org 0x2100 de "testing",0) Again, CCS uses a pragma (#ROM). Perhaps check your list of non-standard pragmas. -- http://www.piclist.com hint: To leave the PICList KILLspampiclist-unsubscribe-requestKILLspammitvma.mit.edu

At 08:59 AM 8/14/02 -0400, you wrote: >I am also using C18 compiler. I found another issue: it seems that the C18 >stores "const" variables both at the program memory and data memory. Yes, some compilers do this. It is (obviously) stored in program memory, and the startup code copies it to RAM. The compiler needs some other instruction to use it directly from code memory, which you will have to find in the manual etc. Best regards, Spehro Pefhany --"it's the network..." "The Journey is the reward" RemoveMEspeffTakeThisOuTinterlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com 9/11 United we Stand -- http://www.piclist.com hint: To leave the PICList spamBeGonepiclist-unsubscribe-requestspamBeGonemitvma.mit.edu

I'm running MPLAB C18. I'll see if I can answer some of this. 1. I have not yet found a way to set the configuration bits. I've tried an ASM file that was linked in, but that did not work. I've posted stuff here and on the Microchip web board. People on the web board suggested an asm file. People here suggested some fixes to the asm file to eliminate errors. If you look in the index of the C18 manual under "configuration bits," it gives you a definition of them, but nothing else. So, in answer to question # 1, I don't know! Let me know if you find out how to set the config bits from within C18. 2. Similarly, the manual on C18 only gives us a definition of eeprom. Since the eeprom is not in the memory map, but instead is treated as a peripheral, I'd expect there to be library functions to talk to the eeprom. You can define the initial values for eeprom in assembly (sample code below). I have not tried this in a C based project, though. The C18 libraries manual also includes eeprom in the glossary, but nowhere else. There are eeprom functions in the I2C library, but these talk to external eeprom on an I2C bus. I believe to write to internal eeprom, you'll have to define your own functions (in C or asm). Putting a rom qualifier in front of a type forces the constant to be in program memory instead of RAM. It does not force it into eeprom. 3. On default values in eeprom, you MIGHT be able to link in the asm file (like that below). I have not tried it, though. I know of no way to define eeprom values directly in C18. 4. don't know about the object file checksum errors. I've never gotten that on my Promate. Harold Sample eeprom intialization ASM below: ; -----------------------------------EEPROM Allocation------------------------------------------- LightMeterScaleHi equ 0 LightMeterScaleLo equ 1 ; Light meter scaling factor in eeprom CC1seconds equ 2 ; Store custom program curing mode 1 duration CC2seconds equ 3 CC3seconds equ 4 CC4seconds equ 5 ; Store custom program curing mode 4 duration RunTime0 equ 0x06 ; Run time counter advanced every 256us RunTime1 equ 0x07 ; RunTime2 equ 0x08 ; Advanced every 234uS or hours/256 RunTime3 equ 0x09 ; Hours lo RunTime4 equ 0x0a ; Hours hi LampStartCountHi equ 0x0b ; Lamp starts hi LampStartCountLo equ 0x0c ; Lamp starts lo org 0x2100 de 01, 00 ; Default light meter scaling factor of 1 ifdef xenon de d'1' ; minimum time for custom cure 1 de d'1' ; minimum time for custom cure 2 de d'5' ; minimum time for custom cure 3 de d'5' ; minimum time for custom cure 4 else de d'3' ; minimum time for custom cure 1 de d'10' ; minimum time for custom cure 2 de d'15' ; minimum time for custom cure 3 de d'25' ; minimum time for custom cure 4 endif de low(-d'3600'),high(-d'3600'),0, RevCodeMonth, RevCodeDay ; Runtime initialized at month/day of rev (reset during cal) de 0,0 ; Lamp cycle count initialized at zero FCC Rules Online at http://hallikainen.com/FccRules Lighting control for theatre and television at http://www.dovesystems.com Reach broadcasters, engineers, manufacturers, compliance labs, and attorneys. Advertise at http://www.hallikainen.com/FccRules/ . ________________________________________________________________ GET INTERNET ACCESS FROM JUNO! Juno offers FREE or PREMIUM Internet access for less! Join Juno today! For your FREE software, visit: dl.http://www.juno.com/get/web/. -- http://www.piclist.com hint: To leave the PICList TakeThisOuTpiclist-unsubscribe-requestEraseMEspam_OUTmitvma.mit.edu

On Wed, 14 Aug 2002 16:30:36 +0300 =?iso-8859-9?B?1m1lciBZYWxo/Q==?= <RemoveMEoyalhiTakeThisOuTTEKSAN.COM.TR> writes: > I don't need any bank selection yet, so I have not looked into it. > With > IAR C you have to declare the variables with banks and then you can > forget about them when using, bank changing is done automatically. > I > assumed it would be the same case with C18, isn't that so? I believe it is. I've not had to deal with bank switching in C18. It seems to have taken care of it for me. Harold FCC Rules Online at http://hallikainen.com/FccRules Lighting control for theatre and television at http://www.dovesystems.com Reach broadcasters, engineers, manufacturers, compliance labs, and attorneys. Advertise at http://www.hallikainen.com/FccRules/ . ________________________________________________________________ GET INTERNET ACCESS FROM JUNO! Juno offers FREE or PREMIUM Internet access for less! Join Juno today! For your FREE software, visit: dl.http://www.juno.com/get/web/. -- http://www.piclist.com hint: To leave the PICList piclist-unsubscribe-requestEraseME.....mitvma.mit.edu

part 1 4631 bytes content-type:text/plain; (decoded quoted-printable) Finally I did find it!!! Here are the configuration bits in ASM to be included in a C18 project. Don't forget to change the __config lines to your needs. Hope this helps. �mer YALHI EraseMEoyalhiteksan.com.tr http://www.teksan.com.tr Tel : +90 212 613 22 00 Fax: +90 212 544 70 35 {Original Message removed} part 2 3264 bytes content-type:application/octet-stream; (decode) part 3 154 bytes -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

Hello, I'm very disappointed with CCS-PCH and I'm wanting to give MPLAB-C18 a serious try. Anyone here knows the time limit of the demo and beta versions at http://www.microchip.com/1010/pline/tools/picmicro/code/mplab18/index.htm? Also, I can't find the price. How much does it costs? Thank you very much, Brusque ----------------------------------------------------------------- Edson Brusque C.I.Tronics Lighting Designers Ltda Research and Development Blumenau - SC - Brazil Say NO to HTML mail http://www.citronics.com.br ----------------------------------------------------------------- -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

What is your disappointend with CCS-PCH? Claudio P.s. I'm not connected to CCS, I only use their compiler. -----Oorspronkelijk bericht----- I'm very disappointed with CCS-PCH and I'm wanting to give MPLAB-C18 a serious try. -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

I have both compilers but not yet used the CCS-PCH. MPLAB C18 works for me now. The price is about 450 USD as I recall. What was it that you don't like about the CCS-PCH? Since there is a lot of info on the net I am considering to switch to CCS-PCH. Have you considered purchasing the "PIC C Routines", there is very good info in there I think. Ömer YALHI RemoveMEoyalhiEraseMEEraseMEteksan.com.tr http://www.teksan.com.tr Tel : +90 212 613 22 00 Fax: +90 212 544 70 35 {Original Message removed}

Hello Claudio, > What is your disappointend with CCS-PCH? too much buggy. And I'm not the only one to complain about this. The PCM is very stable now, but the PCH have some weird problems regarding RAM and ROM allocation. The sh*t is that no one have found those problems on small programs and they are very hard to track on large (more than 2000 lines) programs where they make a mess. For example, I have an application that is working very well. It's a controller for an automation system. Then I just try to include a line on a section of the program that isn't even executed at program start (say, at the configuration menu), and the PIC keeps resseting itself well at the beginning of main(). I hope they correct this soon, or I'll have to move to another compiler. I have to travel monday and show this controller to a client and it will not be complete just because I've expended the last 3 days trying to track those horrible compiler bugs. Best regards, Brusque ----------------------------------------------------------------- Edson Brusque C.I.Tronics Lighting Designers Ltda Research and Development Blumenau - SC - Brazil Say NO to HTML mail http://www.citronics.com.br ----------------------------------------------------------------- -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics