CCS/TM4C123GH6PM: Compile error in CCS Trouble Reading Memory Block at 0x702

Diwakar Vishakhadatta

Prodigy 10 points

Part Number: TM4C123GH6PM

Tool/software: Code Composer Studio

Hi there,

I'm compiling the following code on the TM4C123G LaunchPad via CCS 8.2.0.0007

#include <stdint.h>
#include <stdbool.h>

#define ROWS 2 //Number of rows
#define COLS 3 //Number of columns
#define PIXELS ROWS*COLS // Pixels in the strip

struct Node { //Build a structure for pointer, R, G, B
struct Node *Next;
uint8_t var1;
uint8_t var2;
uint8_t var3;
};
typedef struct Node NodeArr;

NodeArr theArray[ROWS][COLS];

NodeArr *HeadPt = &theArray[0][0];
NodeArr *pt;
pt = HeadPt;

while (1) {

}
}

Just at build, I get the following error messages:

CORTEX_M4_0: Trouble Reading Memory Block at 0x702001e7 on Page 0 of Length 0x4: Debug Port error occurred.
CORTEX_M4_0: Trouble Reading Memory Block at 0x702001e7 on Page 0 of Length 0x4: Debug Port error occurred.
CORTEX_M4_0: Trouble Reading Memory Block at 0x702001e7 on Page 0 of Length 0x4: Debug Port error occurred.

Two things:

- The memory space shown here is "external SRAM"!

- The same program compiles without issues on an online C-compiler (and runs) with no issues.

Any ideas why this might be happening?

Thanks for your attention!

over 6 years ago

0 Charles Tsai over 6 years ago

TI__Guru**** 191486 points

Where is your main()? You should try something like this.

#include <stdint.h>
#include <stdbool.h>

//*****************************************************************************
//
// Print "Hello World!" to the UART on the evaluation board.
//
//*****************************************************************************
#define ROWS 2 //Number of rows
#define COLS 3 //Number of columns
#define PIXELS ROWS*COLS // Pixels in the strip


int
main(void)
{
    struct Node { //Build a structure for pointer, R, G, B
    struct Node *Next;
    uint8_t var1;
    uint8_t var2;
    uint8_t var3;
    };
    typedef struct Node NodeArr;

    NodeArr theArray[ROWS][COLS];

    NodeArr *HeadPt = &theArray[0][0];
    NodeArr *pt;
    pt = HeadPt;

    while (1) {

    }
}

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CCS/TM4C123GH6PM: Compile error in CCS Trouble Reading Memory Block at 0x702