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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

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  • 0 in reply to Raj Mittal

    How did u read back from Flash location in IAP, because I didn't get any command for it in the manual.
    One more thing about IAP, whether IAP is only used for run-time programming? Means when program is running in device and without stopping that program we want to load new program then only IAP is used? Is it so? Please clear this doubt...I am confused about this..

    to store variables in flash in runtime, isn't it possible in ISP?

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  • 0 in reply to Raj Mittal

    How did u read back from Flash location in IAP, because I didn't get any command for it in the manual.
    One more thing about IAP, whether IAP is only used for run-time programming? Means when program is running in device and without stopping that program we want to load new program then only IAP is used? Is it so? Please clear this doubt...I am confused about this..

    to store variables in flash in runtime, isn't it possible in ISP?

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  • 0 in reply to pravin patil

    ISP means In-System Programming (or "Programmable")
    This means that the chip can be programmed in-situ, without having to be removed and placed into a special programming tool.

    IAP means In-Application Programming (or "Programmable")
    This means that the chip can be programmed while it is still running its Application.

    Clearly, IAP requires ISP.

    However, ISP does not imply IAP

    In many cases where IAP facilities are provided, they are intended for code storage - they not well suited to data storage.

  • 0 in reply to pravin patil

    "How to read back from flash"

    ARM processors generally have continous memory map, Review the memory map of your controller. You can directly read data from flash locations [using some mean of pointers]

    Yes, IAP is real time. Its allows to read and write flash during program execution. And offcourse you can update your program ,using IAP that is firmware update. But I dont have much information about this.