Main function not found

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Posts: 5
Joined: Mon Jan 03, 2011 3:57 pm

Main function not found

Post by konsgn » Fri Apr 29, 2011 2:10 pm

Hi Lubin,
I've been working on a model to write to an LCD display based on the PIC30F6015. I've been able to fix a memory error with an overflow in .bss by removing z^-1 delays in the thousands. However now that the memory error is fixed, I get to the output display from the PIC compiler telling me how much memory is used, followed by a "main" not found error.
When I load the project in MPLAB, I cannot find the main function in any generated file.

This is a sample output of what I am getting:

Code: Select all

" | Version 3.4cb                             11-Apr-2011        |" 
" | For Matlab 7.11            R2010b                            |" 
" ================================================================"	 
''pic30-gcc   -mcpu=30f6015  LCD_commands.o LCD_data.o SPI_cmd.o rtGetInf.o rtGetNaN.o rt_nonfinite.o LCD.o      C:\PROGRA~1\MICROC~1\mplabc30\v3.25\lib\libpic30-coff.a C:\PROGRA~1\MICROC~1\mplabc30\v3.25\lib\dsPIC30F\libp30f6015-coff.a C:\PROGRA~1\MICROC~1\mplabc30\v3.25\lib\libc-coff.a C:\PROGRA~1\MICROC~1\mplabc30\v3.25\lib\libm-coff.a -o ..\../LCD.cof -Xlinker --script=C:\PROGRA~1\MICROC~1\mplabc30\v3.25\support\dsPIC30F\gld\p30f6015.gld -Xlinker -t -Xlinker --report-mem -Xlinker -Map=../ -Xlinker --heap=0 -Xlinker -cref	  
c:\program files\microchip\mplabc30\v3.25\bin\bin\..\bin/pic30-coff-ld.exe: mode pic30_coff 
Program Memory  [Origin = 0x100, Length = 0x17f00] 
section                    address   length (PC units)   length (bytes) (dec) 
-------                    -------   -----------------   -------------------- 
.text                        0x100               0x4e4           0x756  (1878) 
.const                       0x5e4               0xb2e          0x10c5  (4293) 
.text                       0x1112               0x450           0x678  (1656) 
.dinit                      0x1562                0x3a            0x57  (87) 
.text                       0x159c                0x46            0x69  (105) 
.isr                        0x15e2                 0x2             0x3  (3) 
                     Total program memory used (bytes):         0x1f56  (8022) 5% 
Data Memory  [Origin = 0x800, Length = 0x1fa0] 
section                    address      alignment gaps    total length  (dec) 
-------                    -------      --------------    ------------------- 
.nbss                        0x800                   0           0x7f6  (2038) 
.ndata                       0xff6                   0            0x20  (32) 
.nbss                       0x1016                   0            0x18  (24) 
.ndata                      0x102e                   0             0x4  (4) 
.nbss                       0x1032                   0             0x2  (2) 
                        Total data memory used (bytes):          0x834  (2100) 25% 
Dynamic Memory Usage 
region                     address                      maximum length  (dec) 
------                     -------                      --------------------- 
heap                             0                                   0  (0) 
stack                       0x1034                              0x176c  (5996) 
                        Maximum dynamic memory (bytes):         0x176c  (5996) 
C:\PROGRA~1\MICROC~1\mplabc30\v3.25\lib\libpic30-coff.a(crt0_standard.o)(.init+0x1a):crt0_standard.s: undefined reference to `main' 
C:\PROGRA~1\MICROC~1\mplabc30\v3.25\lib\libpic30-coff.a(crt0_standard.o)(.init+0x1c):crt0_standard.s: undefined reference to `main' 
c:\program files\microchip\mplabc30\v3.25\bin\bin\..\bin/pic30-coff-ld.exe: link errors found, deleting executable `..\../LCD.cof' 
gmake: *** [..\../LCD.cof] Error 255 
I will be attaching a zip file with the model and related c files.

Also, Is there a better way of getting delays in seconds rather than using the memory intensive z^-1 block
Thank you,
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Posts: 5
Joined: Mon Jan 03, 2011 3:57 pm

Re: Main function not found

Post by konsgn » Thu May 12, 2011 3:12 pm

Hi All,
I got the error fixed. By moving it to a folder located within the subdirectories that also house the dsPIC install, it started working.

I do still have a couple of questions.

1. Why does the z^-1 delay block take up a ridiculous amount of memory? Does it create a variable for every timestep from start to end?
2. What is the best block to use for a delay in seconds?
3. Is there a way to format hex float to string in Simulink, or will I have to use a Custom C call to fprintf?

Thank you,

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