Posted on May 17, 2011 at 09:59Hello,
I work with the STR9FA12W47, with bank0 = 2048kB and bank1 = 128kB. And I have some questions about the using of the FMI registers.
I build a bootloader in the bank1, witch jumps into the bank0, where there is my user application. So my boot bank is the bank1 (128kB). When I jump, I have to remapping my configuration of boot bank.
Here the code of the jump function
void __ramfunc ROM_Jump (void)
{
pFunction JumpTo;
// before change mapping, disable all VIC
VIC0->INTECR |= 0xFFFF;
VIC1->INTECR |= 0xFFFF;
// Change mapping:
FMI->BBADR = 0x200000 >> 2;
FMI->NBBADR = 0x0;
JumpTo = (pFunction)0x0;
JumpTo();
}
This code is working very well ! :)
But When I try to redefine the Boot and Non Boot Bank size my application crash..
Here the code of the function jump that causes a crash of the user application.
void __ramfunc ROM_Jump (void)
{
pFunction JumpTo;
// before change mapping, disable all VIC
VIC0->INTECR |= 0xFFFF;
VIC1->INTECR |= 0xFFFF;
// Change mapping:
FMI->BBSR = 0x6;
FMI->NBBSR = 0x5; //0x4
FMI->BBADR = 0x200000 >> 2;
FMI->NBBADR = 0x0;
JumpTo = (pFunction)0x0;
JumpTo();
}
So the only difference between the two codes is the redefinition of the FMI->BBSR and FMI->NBBSR.
It is the reason why I post this message. I would like to know how STR9 uses this register ? What are their impacts on the STR9 ?
If somebody have the answers of this questions, please let's me to kown it :D
