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Relocating vector table cortex M3 question.

Posted by boogalee on January 21, 2016

Hi,

im using CC2538(cortex m3)

if i want to port on CC2538, i have to relocate vector table.

so i had searched datasheet, i founded my code have to be located at 0x0020_0000~

but, vector table address is set at reset 0x0000_0000. this is rom area.

so i have to relocate vector table address.

i had tried access vector table offset register(VTABLE) <- other vendor's register name was VTOR.

i just had access this register and just allocate appropriate value.

~~~~

define VTABLE ( * ( ( uint32_t * ) 0xE000ED08 ) )

VTABLE = 0x0020000F; ~~~~ i had defined VTABLE ( * ( ( uint32_t * ) 0xE000ED08 ) ) which VTABLE register's address

and allocate appropriate address value.

it was working !!

but... i dont know why it was worked....

what should i know to relocate vector address value.

Regrads. WON HEE LEE


Relocating vector table cortex M3 question.

Posted by edwards3 on January 21, 2016

Are you sure you have to relocate the table? Lots of Cortex-M will mirror the vector table region in memory to address 0 even when there is no physical memory at 0.


Relocating vector table cortex M3 question.

Posted by boogalee on January 21, 2016

yes ! i had checked datasheet and i had tested it.

if i didn't relocate vector table's addres, it didn't work.

but attached below code

~~~~

define VTABLE ( * ( ( uint32_t * ) 0xE000ED08 ) )

VTABLE = 0x0020000F; ~~~~ it had worked.

and then i had realized that i have to relocate vector table.

but... i dont know why it was working yet...


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