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Problem with LPC1768 USB bootloader

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 Lukasz Gesieniec over 15 years ago in reply to John Linq

Hi All,

in the example from NXP is an error. SP register must be set correctly before jump to the user application. I have changed execute_user_code() function:

void execute_user_code(void)
{
        void (*user_code_entry)(void);

        /* Change the Vector Table to the USER_FLASH_START
        in case the user application uses interrupts */

        volatile const DWORD *stack_adr = 0x00002000;
        volatile const DWORD *start_adr = 0x00002004;

        __MSR_MSP(*stack_adr);

        NVIC_SetVectorTable(NVIC_VectTab_FLASH, USER_FLASH_START);

        user_code_entry = (void (*)(void))(*start_adr);
        user_code_entry();

}

Regards

Reply

0 Lukasz Gesieniec over 15 years ago in reply to John Linq

Hi All,

in the example from NXP is an error. SP register must be set correctly before jump to the user application. I have changed execute_user_code() function:

void execute_user_code(void)
{
        void (*user_code_entry)(void);

        /* Change the Vector Table to the USER_FLASH_START
        in case the user application uses interrupts */

        volatile const DWORD *stack_adr = 0x00002000;
        volatile const DWORD *start_adr = 0x00002004;

        __MSR_MSP(*stack_adr);

        NVIC_SetVectorTable(NVIC_VectTab_FLASH, USER_FLASH_START);

        user_code_entry = (void (*)(void))(*start_adr);
        user_code_entry();

}

Regards

Children

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