topic Re: S32K144 bootloader jump into application in S32K

S32K144 bootloader jump into application

jimfung — Sat, 20 May 2017 07:56:35 GMT

Hi,

How the bootloader to jump into application? When program jumps into the application, the mcu will reset. I use the function below to jump, does it work?

void JumpToExecute(uint32_t SP, uint32_t Startup)
{
volatile uint32_t avoid_optimization;

   /* In order to avoid optimization issue when -Os */
   avoid_optimization = SP;
   /* In order to avoid optimization issue when -Os */
   avoid_optimization = Startup;

   /* set up stack pointer */
   __asm("msr msp, r0");
   __asm("msr psp, r0");

/* Jump to PC (r1) */
__asm("mov pc, r1");
}

Thanks & regards,

Jim

Re: S32K144 bootloader jump into application

lukaszadrapa — Thu, 25 May 2017 11:30:15 GMT

Hi,

__asm("ldr r0,=main"); //load address of main function (use any address you need)
__asm("blx r0"); //jump to this address

Regards,

Lukas

Re: S32K144 bootloader jump into application

stanish — Thu, 25 May 2017 14:58:43 GMT

Hi Kim,

Could you possibly try this:

typedef void (*func_ptr)(); // pointer to function type

void JumpToExecute(unsigned int SP, unsigned int Startup)
{
  __asm("mov r13, r0");   // Store it to SP (R13)
  (*(func_ptr)Startup)(); // Jump at Startup
}‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Hope it helps.

Re: S32K144 bootloader jump into application

jimfung — Sat, 27 May 2017 03:52:59 GMT

Hi Lukas,

Thanks for your reply! Now i have another question, how to remap the interrupt vector table?

I have changed the xxx.ld file in the bootloader below, and i also set the register S32_SCB->VTOR = (uint32_t)0x8000 before jump to application from bootloader. But it seems that it didn't work.

MEMORY
{
/* Flash */
m_interrupts          (RX) : ORIGIN = 0x00008000, LENGTH = 0x00000400
m_flash_config        (RX) : ORIGIN = 0x00008400, LENGTH = 0x00000010
m_text                (RX) : ORIGIN = 0x00008410, LENGTH = 0x0007FBF0 - 0x8000

/* SRAM_L */
m_data (RW) : ORIGIN = 0x1FFF8000, LENGTH = 0x00008000

/* SRAM_U */
m_data_2 (RW) : ORIGIN = 0x20000000, LENGTH = 0x00007000
}

Re: S32K144 bootloader jump into application

eautopower — Thu, 21 Sep 2017 08:27:46 GMT

kim:

could you tell me how to jump to APP,this is my e_mail xiexingying@eautopower.com

thank you !

Re: S32K144 bootloader jump into application

MehmetKirgozoglu — Tue, 18 Aug 2020 13:05:47 GMT

Hi Stanislav,
I am using MKM34Z processor and Jump to Application code just like you mentioned, but program cannot exit Reset_Handler. I am using IAR and Reset Handler is below;

PUBWEAK Reset_Handler
SECTION .text:CODE:REORDER:NOROOT(2)
Reset_Handler
CPSID I ; Mask interrupts
LDR R0, =0xE000ED08
LDR R1, =__vector_table
STR R1, [R0]
LDR R2, [R1]
MSR MSP, R2
LDR R0, =SystemInit
BLX R0
CPSIE I ; Unmask interrupts
LDR R0, =__iar_program_start
BX R0

What do you think is the reason, where am I doing wrong? I would be glad if you help. Thank you.

Re: S32K144 bootloader jump into application

stanish — Mon, 24 Aug 2020 09:27:26 GMT

Hi Mehmet,

If I understand your issue correctly you are able to jump to the application code (Reset_Handler) but it either never leaves it.

I'd suggest you to deinitialize all the interrupt sources (peripherals) used by the bootloader before you jump to the application code.

see e.g. https://community.nxp.com/message/1339695#comment-1341598

Hope it helps.

Stan