Debug of nested C structure

[picchiedi]

Hello.
The enclose simple code, that uses nested C structure, fills an array with 0xFF values.
When I debug, looking at the real time array values update, I have following indication:
Format (-1) not valid for type (0x00000000).

Code: Select all

/* Main.c file generated by New Project wizard
 *
 * Created:   dom mag 30 2021
 * Processor: PIC18F452
 * Compiler:  HI-TECH C for PIC18
 */

#include <htc.h>

#define  ON   1 
#define  OFF   0 
 
#define  YVAL 64 // DEFINE 64 LINES 
#define  XVAL 8 // DEFINE 8X16=128 COLUMN

typedef union {
    int word;
    char nbyte[2];
} Dots;

typedef struct {
      Dots pix[YVAL][XVAL];
} GD_RAM;

GD_RAM gdram;

void glcd_fillScreen(char color) {
    char v, h;
    int d;
  
	   d = (color == ON ? 0xFFFF : 0x0000);
 
    for (v = 0; v < YVAL; v++) {
        for (h = 0; h < XVAL; h++) {
            gdram.pix[v][h].word = d;
            __delay_us(10);                                                                     //
        }
    }
 }

void main(void)
 { 
		glcd_fillScreen(ON);
		while (1)
      ;
 }

Thanks for any kind suggestion.

Regards

[Ettore]

I think it's the union which makes debugger unable to define a valid data type (word ?, ascii text ?).
You can always force manually a data type if you click right on that highlighted line and select Hexadecimal.
Unfortunately you need to do that for any array element. Also, those manual settings are NOT persistent when you stop and re-run the simulation.

[picchiedi]

Thanks a lot, Ettore.
I did it, and you are right, but what I found strange is that all array elements are updated at the same time, and not one by one, as the "for cycles" procede.
However it is not crucial, since I can see the proper update in the RAM window...

Regards