Secondary bootloader for LPC11U24

lpcware — Thu, 16 Jun 2016 02:23:03 GMT

Content originally posted in LPCWare by saraswathi on Mon May 27 07:15:42 MST 2013
Hi,

I am working on secondary bootloader for LPC11U24. I am using USB interrupt at secondary bootloader and application code. Hence I can't redirect the interrupt to application. For this reason I am using remapping of interrupts to RAM.

I reffered the post http://knowledgebase.nxp.com/showthread.php?t=3615 and copied the following code to to my application main.c file.

[B]#define VECTOR_IN_RAM_LENGTH 47 //stackpointer not counted
uint32_t vector_in_ram[VECTOR_IN_RAM_LENGTH] __attribute__ ((section ("vtable")));[/B]
[B] uint32_t *p = (uint32_t *) 0x1000;[/B]
[B] __disable_irq();
// copy the interrupt vector table on base RAM
for (i=0; i<VECTOR_IN_RAM_LENGTH; i++)
vector_in_ram = *(p + i);
LPC_SYSCON->SYSMEMREMAP = 0x1;
__enable_irq();[/B]

I am just modifying here "uint32_t *p = (uint32_t *) 0x4000;" since my application start address is 4000.

With only this much change the interrupts are not working at application. What other modifications I need to do at application main.c?
What needs to be added at bootloader code?

Also, I giving the memory mapping of both the projects.
The memory mapping selected for bootloader is as follows:
/* Define each memory region */
MFlash32 (rx) : ORIGIN = 0x0, LENGTH = 0x3000 /* 12k */
RamLoc8 (rwx) : ORIGIN = 0x100000c0, LENGTH = 0x1f40 /* 7k */
RamUsb2 (rwx) : ORIGIN = 0x20004000, LENGTH = 0x800 /* 2k */

/* Define a symbol for the top of each memory region */
__top_MFlash32 = 0x0 + 0x3000;
__top_RamLoc8 = 0x100000c0 + 0x1f40;
__top_RamUsb2 = 0x20004000 + 0x800;

The memory mapping selected for application is as follows:
/* Define each memory region */
MFlash32 (rx) : ORIGIN = 0x4000, LENGTH = 0x4000 /* 16k */
RamLoc8 (rwx) : ORIGIN = 0x100000c0, LENGTH = 0x1f40 /* 7k */
RamUsb2 (rwx) : ORIGIN = 0x20004000, LENGTH = 0x800 /* 2k */

/* Define a symbol for the top of each memory region */
__top_MFlash32 = 0x4000 + 0x4000;
__top_RamLoc8 = 0x100000c0 + 0x1f40;
__top_RamUsb2 = 0x20004000 + 0x800;

Can anyone guide me how to solve this issue?

With regards
Saraswathi C

Re: Secondary bootloader for LPC11U24

harrienoorlande — Fri, 04 Nov 2016 10:08:06 GMT

Dear Saraswathi C,

The problem wich you describe is kind of the same to the issue I am furrently facing.

I was wondering if you have been able to figure out an solution or workaround to this problem?

Kind regards,

H.W. Noorlander

topic Re: Secondary bootloader for LPC11U24 in LPCXpresso IDE

Secondary bootloader for LPC11U24

Re: Secondary bootloader for LPC11U24