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Question

I want to write a bootloader for my stm32l4 mcu which (after pressing a button) jumps to another part of flash and run the app on that part. for application part I write a simple blinky and generate its BIN file and copy this bin file to address 0x0800 8000 of flash memory.

Now I do not know how can I jump to this address and run this blinky app.

would anyone help me?

best!

I'd mark this as a duplicate of stackoverflow.com/questions/14393715/… except that is for Stellaris - the answer however applies to any Cortex-M3 or M4. — Clifford
Why exactly can't you use a function? Are you flashing the code in multiple steps or something? Running code from data flash? — Lundin

the busybee the busybee · Accepted Answer · 2021-08-29T09:58:01

At least two alternatives spring to mind:

Use a function pointer:

    /* ... */
    void (*app)(void) = (void (*)(void))0x08008000;
    app();

Declare an external function and resolve it with your linker script:
```
    /* ... */
    void app(void);
    app();
```
How to define the address in the linker script depends on your linker.

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