PIC18F8527 Array Limit
According to the PBP manual, PIC18Xxxxx device variable arrays are only limited by available memory. I have verified there is lots of available memory, but the line:
AIAvgReg var word[128]
gets me this error
ERROR: Unable to fit variable AIAvgReg
Reducing the number of elements to 127 works ok. Even if the limit was one RAM bank, as in older PICS, the 128 Words should still fit in one bank.
Any idea what is wrong?
PBP 2.60A, PBPL
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No, but it does compile correctly here forOriginally Posted by jtowich
, even when using pbpl.Code:AIAvgReg var word[1500]
So, either, you are using too many other variables, or possibly, you are compiling for the wrong chip. Or, maybe mpasm version issue?
Walter
http://www.scalerobotics.com
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Hi,
What else do you have in ways of variables? I tried it here and it compiles just fine, even with the array declared as 1900 words. Are you sure you're compiling for the 18F8527 and not a device with less RAM?
/Henrik.
EDIT: Ha, double post there Walter, pretty identical as well :-)
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Thanks for the quick response
I am definitely have the 18F8527 selected. I tried an array of 1000 words and it didn't work. However, it works fine if I try 10 arrays of 127 words, so lack of memory is not an issue. Just doesn't like anything over 255 bytes in an array.
I'll keep looking.
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If you open up your xxxx.lst file, you can see where your assembler thinks the ram start and end locations are. For some reason, this sounds buggered. It also will show which MPASM version you are using, and which processor includes you are using.
Here's what mine looked like. You can compare it to yours and see if there are differences in RAM locations.
Code:MPASM 5.38 UNTITLED.ASM 1-21-2011 10:05:20 PAGE 1 LOC OBJECT CODE LINE SOURCE TEXT VALUE 00001 00002 ; PICBASIC PRO(TM) Compiler 2.60LA, (c) 1998, 2009 microEngineering Labs, Inc. All Rights Reserved. 00000001 00003 _USED EQU 1 00004 00005 INCLUDE "C:\PBP\18F8527.INC" 00001 ;**************************************************************** 00002 ;* 18F8527.INC * 00003 ;* * 00004 ;* By : Leonard Zerman, Jeff Schmoyer * 00005 ;* Notice : Copyright (c) 2008 microEngineering Labs, Inc. * 00006 ;* All Rights Reserved * 00007 ;* Date : 09/15/08 * 00008 ;* Version : 2.60 * 00009 ;* Notes : * 00010 ;**************************************************************** 00017 LIST 00018 LIST p = 18F8527, r = dec, w = -311, w = -230, f = inhx32 00019 INCLUDE "P18F8527.INC" ; MPASM Header 00001 LIST 00002 00003 ;========================================================================== 00004 ; MPASM PIC18F8527 processor include 00005 ; 00006 ; (c) Copyright 1999-2010 Microchip Technology, All rights reserved 00007 ;========================================================================== 00008 02400 LIST 300000 32FF 00020 __CONFIG _CONFIG1H, _OSC_HS_1H & _FCMEN_OFF_1H & _IESO_OFF_1H 300002 F31F 00021 __CONFIG _CONFIG2H, _WDT_ON_2H & _WDTPS_512_2H 300006 FF8B 00022 __CONFIG _CONFIG4L, _STVREN_ON_4L & _LVP_OFF_4L & _BBSIZ_BB2K_4L & _XINST_OFF_4L 00025 LIST 00F00000 00026 EEPROM_START EQU 0F00000h 00000040 00027 BLOCK_SIZE EQU 64 00006 00000000 00007 RAM_START EQU 00000h 00000F5F 00008 RAM_END EQU 00F5Fh 00000010 00009 RAM_BANKS EQU 00010h 00000060 00010 BANK0_START EQU 00060h 000000FF 00011 BANK0_END EQU 000FFh 00000100 00012 BANK1_START EQU 00100h 000001FF 00013 BANK1_END EQU 001FFh 00000200 00014 BANK2_START EQU 00200h 000002FF 00015 BANK2_END EQU 002FFh 00000300 00016 BANK3_START EQU 00300h 000003FF 00017 BANK3_END EQU 003FFh 00000400 00018 BANK4_START EQU 00400h 000004FF 00019 BANK4_END EQU 004FFh 00000500 00020 BANK5_START EQU 00500h 000005FF 00021 BANK5_END EQU 005FFh 00000600 00022 BANK6_START EQU 00600h 000006FF 00023 BANK6_END EQU 006FFh 00000700 00024 BANK7_START EQU 00700h 000007FF 00025 BANK7_END EQU 007FFh MPASM 5.38 UNTITLED.ASM 1-21-2011 10:05:20 PAGE 2 LOC OBJECT CODE LINE SOURCE TEXT VALUE 00000800 00026 BANK8_START EQU 00800h 000008FF 00027 BANK8_END EQU 008FFh 00000900 00028 BANK9_START EQU 00900h 000009FF 00029 BANK9_END EQU 009FFh 00000A00 00030 BANK10_START EQU 00A00h 00000AFF 00031 BANK10_END EQU 00AFFh 00000B00 00032 BANK11_START EQU 00B00h 00000BFF 00033 BANK11_END EQU 00BFFh 00000C00 00034 BANK12_START EQU 00C00h 00000CFF 00035 BANK12_END EQU 00CFFh 00000D00 00036 BANK13_START EQU 00D00h 00000DFF 00037 BANK13_END EQU 00DFFh 00000E00 00038 BANK14_START EQU 00E00h 00000EFF 00039 BANK14_END EQU 00EFFh 00000F00 00040 BANK15_START EQU 00F00h 00000F5F 00041 BANK15_END EQU 00F5Fh 00000000 00042 BANKA_START EQU 00000h 0000005F 00043 BANKA_END EQU 0005Fh
http://www.scalerobotics.com
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My lst shows the same memory locations and processor. Strange.
Code:00001 00002 ; PICBASIC PRO(TM) Compiler 2.60LA, (c) 1998, 2009 microEngineering Labs, Inc. All Rights Reserved. 00000001 00003 _USED EQU 1 00004 00005 INCLUDE "C:\PBP\18F8527.INC" 00001 ;**************************************************************** 00002 ;* 18F8527.INC * 00003 ;* * 00004 ;* By : Leonard Zerman, Jeff Schmoyer * 00005 ;* Notice : Copyright (c) 2008 microEngineering Labs, Inc. * 00006 ;* All Rights Reserved * 00007 ;* Date : 09/15/08 * 00008 ;* Version : 2.60 * 00009 ;* Notes : * 00010 ;**************************************************************** 00017 LIST 00018 LIST p = 18F8527, r = dec, w = -311, w = -230, f = inhx32 00019 INCLUDE "P18F8527.INC" ; MPASM Header 00001 LIST 00002 00003 ;========================================================================== 00004 ; $Id: P18F8527.INC,v 1.2.2.3 2005/10/18 21:44:56 curtiss Exp $ 00005 ; MPASM PIC18F8527 processor include 00006 ; 00007 ; (c) Copyright 1999-2005 Microchip Technology, All rights reserved 00008 ;========================================================================== 00000000 00029 RAM_START EQU 00000h 00000F5F 00030 RAM_END EQU 00F5Fh 00000010 00031 RAM_BANKS EQU 00010h 00000060 00032 BANK0_START EQU 00060h 000000FF 00033 BANK0_END EQU 000FFh 00000100 00034 BANK1_START EQU 00100h 000001FF 00035 BANK1_END EQU 001FFh 00000200 00036 BANK2_START EQU 00200h 000002FF 00037 BANK2_END EQU 002FFh 00000300 00038 BANK3_START EQU 00300h 000003FF 00039 BANK3_END EQU 003FFh 00000400 00040 BANK4_START EQU 00400h 000004FF 00041 BANK4_END EQU 004FFh 00000500 00042 BANK5_START EQU 00500h 000005FF 00043 BANK5_END EQU 005FFh 00000600 00044 BANK6_START EQU 00600h 000006FF 00045 BANK6_END EQU 006FFh 00000700 00046 BANK7_START EQU 00700h 000007FF 00047 BANK7_END EQU 007FFh 00000800 00048 BANK8_START EQU 00800h 000008FF 00049 BANK8_END EQU 008FFh 00000900 00050 BANK9_START EQU 00900h 000009FF 00051 BANK9_END EQU 009FFh 00000A00 00052 BANK10_START EQU 00A00h 00000AFF 00053 BANK10_END EQU 00AFFh 00000B00 00054 BANK11_START EQU 00B00h 00000BFF 00055 BANK11_END EQU 00BFFh 00000C00 00056 BANK12_START EQU 00C00h 00000CFF 00057 BANK12_END EQU 00CFFh 00000D00 00058 BANK13_START EQU 00D00h 00000DFF 00059 BANK13_END EQU 00DFFh 00000E00 00060 BANK14_START EQU 00E00h 00000EFF 00061 BANK14_END EQU 00EFFh 00000F00 00062 BANK15_START EQU 00F00h 00000F5F 00063 BANK15_END EQU 00F5Fh 00000000 00064 BANKA_START EQU 00000h 0000005F 00065 BANKA_END EQU 0005Fh 00066 00000000 00067 FLAGS EQU RAM_START + 000h 00000001 00068 GOP EQU RAM_START + 001h MPASM 5.03 PCB6AI~1.ASM 1-21-2011 12:16:16 PAGE 3
Last edited by ScaleRobotics; - 21st January 2011 at 20:02.
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Just a guess, but I suspect an MPLAB upgrade will fix your problem.
is pretty old....MPASM 5.03
I suspect that whatever is wrong, is fixed in one of the many newer versions.
http://www.scalerobotics.com
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upgraded to MPASM 5.39, no change.
I'll try reloading all the software when I get a chance.
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I found the problem.
I am using assembly interrupts that reserve a location in each bank for the wsave register. This effectively limits an array size to 255 bytes since the array can't cross this reserved register.
Luckily this processor has a special stack that will store the W, STATUS, and BSR registers automatically and then automatically restore them if a "fast" retfie command is used. This removes the requirement to reserve a memory location in each bank for the wsave register. Using this method works as advertised. This will only work if high priority interrupts are not used, which was the case in my code.
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On 18F types you can force your context saving vars to be placed in access ram so there's no need to put them in more than 1 place.
wsave var byte BANKA SYSTEM ' location for WREG
ssave var byte BANKA SYSTEM ' location for STATUS register
bsave var byte BANKA SYSTEM ' location for BSR register
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You might want to use DT_INTS, it makes it pretty easy to use interrupts, and doesn't cause the problems you are seeing, whether using asm or pbp type interrupts.
http://darreltaylor.com/DT_INTS-18/home.html
http://www.scalerobotics.com
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