TM4C129EKCPDT: How to jump to application address from bootloader

Daniel Fang

Genius 11600 points

Part Number: TM4C129EKCPDT

I put bootloader in flash 0x0~0x10000, application in 0x10000~0x7FFFF.

Could you let me know how to jump to 0x10000 after finish downloading the firmware? Is there a jump example?

I write below code but it doesn't jump to the application address. Thanks.

#define ApplicationAddress 0x10000

void Jump2App(void)

{

// turn off SysTick and its interrupt before entering

ROM_SysTickIntDisable();

ROM_SysTickDisable();

// Disable all processor interrupts.

HWREG(NVIC_DIS0) = 0xffffffff;

HWREG(NVIC_DIS1) = 0xffffffff;

HWREG(NVIC_DIS2) = 0xffffffff;

HWREG(NVIC_DIS3) = 0xffffffff;

HWREG(NVIC_DIS4) = 0xffffffff;

(*((void (*)(void))(*(uint32_t *)ApplicationAddress)))();

}

over 7 years ago

0 Charles Tsai over 7 years ago

TI__Guru**** 191486 points

Hi Daniel,

Have you tried out the various bootloader examples that come with the TivaWare library? Please check out the bl_startup_ccs.s startup file in the bootloader example. Below is a snippet of the code.

    ;;
    ;; Load the stack pointer from the application's vector table.
    ;;
 .if (APP_START_ADDRESS != VTABLE_START_ADDRESS)
    movw    r0, #(APP_START_ADDRESS & 0xffff)
 .if (APP_START_ADDRESS > 0xffff)
    movt    r0, #(APP_START_ADDRESS >> 16)
 .endif
 .endif
    ldr     sp, [r0]

    ;;
    ;; Load the initial PC from the application's vector table and branch to
    ;; the application's entry point.
    ;;
    ldr     r0, [r0, #4]
    bx      r0
    .endasmfunc

Arm-based microcontrollers

Arm-based microcontrollers forum

TM4C129EKCPDT: How to jump to application address from bootloader