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PrinceNai
Joined: 31 Oct 2016
Posts: 480
Location: Montenegro
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| another struct problem |
 Posted: Sun Jun 23, 2019 10:02 am |
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Dear All,
I'm trying to implement an LCD menu structure, translating to CCS this tutorial: https://www.youtube.com/watch?v=PFzNBtnfJ6Y
Up until I hit upon this error, everything compiled OK. I have a structure defined like this:
| Code: |
typedef rom struct MenuStructure{
rom char *text;
unsigned char num_menupoints;
unsigned char up;
unsigned char down;
unsigned char enter;
void (*fp)(void);
}
MenuEntry;
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and then MenuEntry like this:
| Code: |
void start(void);
rom char menu_000[] = " [MAIN SCREEN]"; // 0
rom char menu_001[] = " Option1"; // 1
rom char menu_002[] = " Option2"; // 2
rom char menu_003[] = " Option3"; // 3
rom char menu_004[] = " START"; // 4
rom char menu_100[] = " Sub Menu"; // 5
rom char menu_101[] = " SubOption1"; // 6
rom char menu_102[] = " SubOption2"; // 7
rom char menu_103[] = " RETURN"; // 8
unsigned int8 selected = 1; // indicates selected menu item
// every element of the array must have all elements defined in the prototype: number of elements, up, down, enter and function (can be null)
MenuEntry Menu[] = {
(menu_000, 5, 0, 0, 0, 0), // 0; main menu 0, 5 options, up button menu_000, down button menu_000, enter menu_000, no function attached - non browsable
(menu_001, 5, 1, 2, 5, 0), // 1; main menu 1, 5 options, up button menu_001, down button menu_002, enter menu_101, no function attached
(menu_002, 5, 1, 3, 2, 0), // 2; main menu 2, 5 options, up button menu_001, down button menu_003, enter menu_002, no function attached
(menu_003, 5, 2, 4, 3, 0), // 3; main menu 3, 5 options, up button menu_002, down button menu_004, enter menu_003, no function attached
(menu_004, 5, 3, 4, 4, [b]start[/b]), // 5; main menu 4, 5 options, up button menu_003, down button menu_004 (no roll-over), enter menu_004, start function attached
// (menu_004, 5, 3, 4, 4, 0),
// sub-menu for menu_001
(menu_100, 4, 0, 0, 0, 0), // 6; main menu, 5 options, up button menu_001, down button menu_002, enter menu_101, no function attached
(menu_101, 4, 7, 8, 7, 0), // 7; main menu, 5 options, up button menu_001, down button menu_002, enter menu_101, no function attached
(menu_102, 4, 7, 9, 8, 0), // 8; main menu, 5 options, up button menu_001, down button menu_002, enter menu_101, no function attached
(menu_103, 4, 8, 9, 1, 0) // 9; main menu, 5 options, up button menu_001, down button menu_002, enter menu_101, no function attached
};
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When I add this to my code, the compiler throws me "Element is not a member" error on this line for fp:
| Code: |
if(menu[selected].fp != 0){
menu[selected].fp();
}
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This is my first time trying to do anything with structures, so at this point I don't know what is causing this error. Maybe the function in the structure is defined wrong.
Right now it is a theoretical code (didn't assemble the hardware yet and debounce routine is missing), but I'm compiling it for 18f4550, compiler version 5.078.
Regards,
Samo |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sun Jun 23, 2019 6:53 pm |
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I was able to make the following program work in MPLAB vs. 8.92
simulator, with CCS vs. 5.085. I didn't test any other compiler versions.
It compiles with no errors or warnings.
The program below displays the following in the MPLAB output window:
| Quote: |
Hello World
menu[0].fp = 0000
menu[1].fp = 0068
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ROM Allocation from .SYM file, showing the program picks up
the correct address for the dummy() function:
| Quote: |
000004 @const735.call
000012 @GOTOPTR
000020 @const758.call
000032 @const764.call
000044 @PSTRINGC_9600_31766_31767
000068 dummy
000074 @PSTRINGCN_9600_31766_31767
000094 @PRINTF_X_9600_31766_31767
0000D6 MAIN
0000D6 @cinit1
00010C @cinit2
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Test program:
| Code: | #include <18F46K22.h>
#use delay(internal=4M)
#use rs232(baud=9600, UART1, ERRORS)
void dummy(void)
{
printf("Hello World\n\r");
}
typedef void(*_fptr)(void);
typedef struct MenuStructure
{
rom char *text;
unsigned char num_menupoints;
unsigned char up;
unsigned char down;
unsigned char enter;
_fptr fp;
}MenuEntry;
rom char menu_000[] = " [MAIN SCREEN]";
rom char menu_001[] = " Option1";
unsigned int8 selected = 1;
MenuEntry Menu[] =
{
{menu_000, 5, 0, 0, 0, 0},
{menu_001, 5, 1, 2, 5, dummy}
};
//=============================
void main()
{
if(menu[selected].fp != 0)
{
(*menu[selected].fp)();
}
selected = 0;
printf("menu[0].fp = %lx\r", menu[selected].fp);
selected = 1;
printf("menu[1].fp = %lx\r", menu[selected].fp);
while(TRUE);
} |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19544
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| Posted: Mon Jun 24, 2019 12:34 am |
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The error honestly suggests you may have something else declared
at this point in the code called 'menu'...
I tested PCM_programmers's example in 5.078, just to make sure this
isn't the problem, and it runs fine. |
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PrinceNai
Joined: 31 Oct 2016
Posts: 480
Location: Montenegro
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| Posted: Mon Jun 24, 2019 5:32 am |
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First I tested the program that PCM programmer kindly attached. It works. Then I implemented it on mine and it didn't compile, but with a different error. After half an hour of looking in my monitor I saw what was wrong. I used normal brackets instead of curly ones when I wrote the array. Now it compiles OK.
Thanks |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19544
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| Posted: Mon Jun 24, 2019 6:25 am |
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Aaargh!... 
Been there. Got the 'T'-shirt.
Glad you have found the issue.... |
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