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Re Help Required: How to use onchip flash to store variables?

Raj Mittal

Hi devlopers,

I am usign LPC 2138 ARM controller right now. It has only 32 Kb of SRAM, I have one array say
" char Table[300][300] " of approx. 100 Kb.

I want to store this table in on chip flash memory which is 512 Kb, can anyone guide me how to accomplish this task.

I am using Keil u vision3 compioler and MCB 2138 board [having LPC2138 controller], and using flash programming with LPC flash utility [COM].

Thanks in advance,
Saurabh Pandya

Parents
  • 0 in reply to Andy Neil

    Dear friend.

    Thanks for kind support. I am now able
    to save my whole "char table[400][300]" on
    onchip flash of LPC2138 [512 kb]. I have used various IAP commands for this.

    I want to read various parts of this table back to SRAM , i read in Data sheet that, reading of flash can be accomplish through absolute addressing. But it is not working somehow, and i am not ablr to read data back. I am using following code (psudo)


    char *FlashPointer; /* pointer that points 1st location of sector 5 */

    FlashPointer = 0x5000;


    for(Count=0;Count<NumberOfChars;Count++)
    {
    TempChar = (unsigned char) (&FlashPointer)
    /* Read content from this location*/
    putchar(TempChar); // Send to RS232
    FlashPointer++;
    }

    Please adive me , how to read data back from flash memory....

    Thanks

Reply
  • 0 in reply to Andy Neil

    Dear friend.

    Thanks for kind support. I am now able
    to save my whole "char table[400][300]" on
    onchip flash of LPC2138 [512 kb]. I have used various IAP commands for this.

    I want to read various parts of this table back to SRAM , i read in Data sheet that, reading of flash can be accomplish through absolute addressing. But it is not working somehow, and i am not ablr to read data back. I am using following code (psudo)


    char *FlashPointer; /* pointer that points 1st location of sector 5 */

    FlashPointer = 0x5000;


    for(Count=0;Count<NumberOfChars;Count++)
    {
    TempChar = (unsigned char) (&FlashPointer)
    /* Read content from this location*/
    putchar(TempChar); // Send to RS232
    FlashPointer++;
    }

    Please adive me , how to read data back from flash memory....

    Thanks

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