S32K中的主题 How S32K jumps to function through function address

How S32K jumps to function through function address

2974515017 — Mon, 20 Jul 2020 01:38:02 GMT

Hello:

My development environment is S32DS.I defined a function "void IAP_main(void)" in the program bootloader, fixed his address as 0x00007C00, and the map file showed that the function address was set successfully. Now I need to jump from the program APP to “void IAP_main(void)”, but I pass the following code can not achieve:

(*((void (*)())0x00007C00))();or (*((void (*)())0x00007C01))();

How to solve this problem?

In addition, when I jump from APP to boodloader, I need to keep the peripheral state unchanged. How to initialize the interrupt vector table and stack? The starting address of the flash of the boodloader is 0.

Re: How S32K jumps to function through function address

dianabatrlova — Wed, 22 Jul 2020 07:25:15 GMT

Hello,

You can jump at a certain address by the code below:

typedef void (*function_pointer)(void);

function_pointer func_p = (function_pointer) 0x000007C01;
func_p();

About your second question, you can look at the AN12218 where is this relocation used before jump into the application.

AN12218SW.zip

Vector table relocation S32_SCB->VTOR = (uint32_t)APP_START_ADDRESS;

Best regards,

Diana