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Bootloader LPC1768 - Issues

Sirs

I am needing help on how to mount uv4 simple project to start the development of my bootloader.
My design is :

- LPC1768
- AT45DB041D-SU (Data Flash), on SSP
- Tibbo EM202, as ethernet-serial converter

The initial questions are:

- How to configure the keil project to launch any application to run/debugger at address 0x6000 ?
I tried to configure IROM1 = 0x2000, but doesnt work.
(I've called the System_Init() as first line of main() routine)

So What do I need to do ?

Parents

0 Jean Fernandes over 14 years ago in reply to Jean Fernandes

At 0x0000, i wrote a simple application

#include "type.h"
#include "LPC17xx.H"

#define USER_FLASH_START 0x00002000

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

SCB->VTOR = USER_FLASH_START; user_code_entry = (void (*)(void))((USER_FLASH_START)+1); user_code_entry();
}

int main(void)
{

SystemInit();
execute_user_code(); // call
while(1);

}

It's run perfectly. Note that each Keil project I have separated files to manipulate :
lpc17xx.h, core_cm3.h, system_lpc17xx.c, startup_lpc17xx.s (I use folders named /common/src and /common/inc under the /source folder)

Yesterday, I change a system_lpc17xx.c of my application (that runs at 0x2000). I put at end of this file the following code

// Set Vector table offset value
#if (__RAM_MODE__==1) // <--- i didn't discover the definition on project yet !!!
SCB->VTOR = 0x10000000 & 0x3FFFFF80;
#else
SCB->VTOR = USER_FLASH_ADDRESS; // change the vector to desired address
// SCB->VTOR = 0x00000000 & 0x3FFFFF80;
#endif

and

on Lpc17xx.h

#define USER_FLASH_ADDRESS 0x00002000

After that debug runs ok, but there are a curious flash data written on

0x0000001C 0007 MOVS r7,r0
0x0000001E 0000 MOVS r0,r0

I've noted this on disassembly window. I am searching for the reason.

Any help ?

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