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Problem with LPC1768 USB bootloader

Lukasz Gesieniec

Hi,

I have a problem with USB bootloader. I downloaded sample code from NXP site. I followed instructions AN10866.
Bootloader works fine if I load small program into LPC.
This small program uses interrupts.
But If I load large program then interrupts do not work.
Is this a problem with Vector Table? How to check it? Please help.

Parents
  • 0 in reply to Brian Hanna

    Hi all,

    I have the same problem with NXP Ethernet bootloader.

    The bootloader works fine with a small program but with bigger program, the user application doesn't start at all. It seems to be stuck at the same address in start_up (command STR Rd, [Rn, Offset]).

    The same application works fine, if I compile it to start at address 0x00.

    Vector table has been changed to the a new address and it works fine with the smaller application.

    I have tried to switch optimization level, it doesn't help at all.
    I have tried to set SP register before jumping to the user application. No help.
    Both applications are in privileged mode.

    Please help me out...

    Thanks in advance
    Piritta

Reply
  • 0 in reply to Brian Hanna

    Hi all,

    I have the same problem with NXP Ethernet bootloader.

    The bootloader works fine with a small program but with bigger program, the user application doesn't start at all. It seems to be stuck at the same address in start_up (command STR Rd, [Rn, Offset]).

    The same application works fine, if I compile it to start at address 0x00.

    Vector table has been changed to the a new address and it works fine with the smaller application.

    I have tried to switch optimization level, it doesn't help at all.
    I have tried to set SP register before jumping to the user application. No help.
    Both applications are in privileged mode.

    Please help me out...

    Thanks in advance
    Piritta

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