LPC Microcontrollers中的主题 Re: Re-map vector table to SRAM - LPC51U68

Re-map vector table to SRAM - LPC51U68

carlosmedeiros — Mon, 18 Feb 2019 14:49:46 GMT

Hello,

I'm working with LPC51u68, and I want to copy the vector table from flash to SRAM0.

Vector table is at 0x00000000 at flash and need to go to 0x20000000, from what I understand from the user manual.

I used the VTOR register, and developed the following function:

What do you think of my approach is it correct? I am having doubts on using g_pfnVectors defined in the srtatrup file, is this really my vector table?

Thank you.

Carlos Medeiros

Re: Re-map vector table to SRAM - LPC51U68

Alice_Yang — Tue, 19 Feb 2019 08:50:40 GMT

Hello Carlos Medeiros ,

You can directly define the Destination address to 0x20000000, Source address is 0x00000000,

like this:

void CopyInterruptToSRAM(void)
{
   unsigned int * flashPtr, * ramPtr;
unsigned int * uLimit = (unsigned int *) 0x100;
       ramPtr = (unsigned int *)0x20000000;   //load RAM starting at 0x20000000,
       flashPtr = (unsigned int *)0x0000;           //start of interrupt vector table
      while(flashPtr < uLimit)
           {
               *ramPtr = *flashPtr;
               ramPtr++;
               flashPtr++;
           }
}

BTW, do you development Secondary bootloader ? If yes, are you sure remap data from 0x000 to SRAM？

Have a great day,
TIC

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Re: Re-map vector table to SRAM - LPC51U68

chc_medeiros — Tue, 19 Feb 2019 09:19:26 GMT

Hello Alice!

It's me Carlos, I had to change my email.

Thank you for the reply it was very helpful.

One more question, I understand the CopyInterruptToSRAM(), but after this I need to change the content of the VTOR right?

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Quote:

BTW, do you development Secondary bootloader ? If yes, are you sure remap data from 0x000 to SRAM？

---------------------------------------------------------------------------------------------------------------------------------------------

I have my bootloader in flash and my APP on SRAM, so I need the remap function when I want to do a jump to APP or jump to boot.

Thank you,

Carlos Medeiros

Re: Re-map vector table to SRAM - LPC51U68

Alice_Yang — Wed, 20 Feb 2019 07:16:35 GMT

Hello Carlos,

Yes, you need to change the content of the VTOR , also need to configure SP before jump, the code like below:

typedef void (*pFunction)(void);
pFunction Jump_To_Application;
static uint32_t JumpAddress;

void run_to_app(void)
{
          JumpAddress = *(__IO uint32_t*) (ApplicationAddress + 4);
          /* Jump to user application */
          Jump_To_Application = (pFunction) JumpAddress;
          /* Initialize user application's S4tack Pointer */
          __set_MSP(*(__IO uint32_t*) ApplicationAddress);
          // the contents of the first address of the image, not the address itself.

          SCB->VTOR = ApplicationAddress & 0x1FFFFF80;
          Jump_To_Application();
}

Have a great day,
TIC

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