Jump to application. STM32F051 vs STM32L151 (M0 to M3)

[waclawek.jan]

Why would they be different from the 'F051 case?

JW

[Tesla DeLorean]

If they are machine code, probably that the CM0 has a significantly reduced instruction set and flexibility.

I don't think you can load SP directly, you have to move to r[0..7] one first, and the move over

ie

LDR R0, [R0, #0]

MOV SP,R0

vs

LDR SP,[R0, #0]

[Tesla DeLorean]

The array of things you change has to be 0x20000000

This mirrors or shadows at 0x00000000

[JFELI.13]

Because it is ;)

It works on STM32F051, it doedn't on STM32L151

[JFELI.13]

Y Tesla DeLorean

Thanks a lot for answering to me, it seems it's quite difficult to have solutions for this kind of problem.

• Bootloader run individually (if there is no PROGRAM1 ou PROGRAM2 datas in flash)
• PROGRAM1 or PROGRAM2 run too.
• I putted PROGRAM vectors area at PROGRAM_ADRESS_VECTORS (so 0x... area copied at , for example, 0x400), program code area is at +0x200. This is done by a c# soft who mix bootloader file with program file.

#define BOOTLOADER_ADRESS 0x5B000  
#define VECT_OFFSET 0x00
#define PROGRAM1_ADDR_VECTORS     0x400    // ... <0x326FF  
#define PROGRAM2_ADDR_VECTORS     0x2E000  // ... <0x5B000 

What I did

void JumpToAddress(unsigned long addr)
{
    typedef void (*FunctionPointer)(void);
    FunctionPointer functionPtr = (FunctionPointer)addr;
    functionPtr();
}
 
void TestJump()
{
    unsigned long x4;
 
    union
    {
        unsigned long addr;
        FunctionPointer funcPtr;
    } jump;
 
    jump.addr = PROGRAM1_ADDR_VECTORS;
    SCB_VTOR = PROGRAM1_ADDR_VECTORS;
    WHILE1LEDXX // this line will do LED flashing. I can see PC register is in bootloader area, not in program area
    JumpToAddress(jump.addr);  //if no line "WHILE1LEDXX" I will see PC register is in program area but nothing happen. 
 
    delay_ms(3000);
}

I suppose VTOR must have PC vectors value but it seem it doesn't here

If you have solution ....

[JFELI.13]

Update: it's OK now !!

I can use a bootloader, writed with StmCubeIde and launch a program writed with MikroC