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STM32F411VEtx enabling DFU mode from Application code

KONDA sainath

Hello All,
Am trying to make the STM32f411VEtx board into DFU mode from the Application code, so am trying to write the bootloader code, If any one is having code please share or please help me how to write the code and how to flash as well.
i took a reference code from git and tried to adopt the code for STM32f4 but unable to flash the code via ST flash loader tool

Thanks

  • 0

    Surely, ST would be the place to go for that?

    ST certainly have Application Notes showing how to do bootloaders.

    Hint: look for "IAP" (In-Application Programming).

  • 0 in reply to Andy Neil

    Thanks for responding
    Will this IAP supports DFU via Micro USB.
    I tried to flash the code via UART1(PA9)using USB-TTY (COM port)

  • 0 in reply to KONDA sainath

    IAP will do whatever you program it to do, that's the genius of writing software. ST has DFU USB examples, and USART ones

    The following C and Assembler provide a means to execute the boot ROM of STM32F2 and F4 parts. It sets a value in RAM and then resets, the reset catches this value and remaps the ROM and jumps into it.

    startup.s

    ; Keil based example - Reset into boot loader - sourcer32@gmail.com
; From C
;  extern void SystemReset(void);
;  *((unsigned long *)0x2001FFF0) = 0xDEADBEEF; // Write a scratch location at end of RAM (or wherever)
;  SystemReset(); // or NVIC_SystemReset();


Reset_Handler   PROC
    EXPORT  Reset_Handler
    IMPORT  __main


    ;...


    LDR     R0, =0x2001FFF0 ; Address for RAM signature
    LDR     R1, =0xDEADBEEF
    LDR     R2, [R0, #0] ; Read current
    STR     R0, [R0, #0] ; Invalidate
    CMP     R2, R1
    BEQ     Reboot_Loader

    ; Add other choices


    ;...


    ; Normal startup path

    LDR     R0, =SystemInit
    BLX     R0

    LDR     R0, =__main
    BX      R0

    ENDP

    ;...


    ; Vector into System Loader


Reboot_Loader   PROC
    EXPORT  Reboot_Loader

    LDR     R0, =0x40023844 ; RCC_APB2ENR
    LDR     R1, =0x00004000 ; ENABLE SYSCFG CLOCK
    STR     R1, [R0, #0]
    LDR     R0, =0x40013800 ; SYSCFG_MEMRMP
    LDR     R1, =0x00000001 ; MAP ROM AT ZERO
    STR     R1, [R0, #0]
    LDR     R0, =0x1FFF0000 ; ROM BASE
    LDR     SP,[R0, #0]     ; SP @ +0
    LDR     R0,[R0, #4]     ; PC @ +4
    BX      R0

    ENDP ; sourcer32@gmail.com


SystemReset     PROC
    EXPORT  SystemReset

    ldr     r1, =0xE000ED0C ; NVIC Application Interrupt and Controller
    ldr     r0, =0x05FA0004 ; Magic
    str     r0, [r1, #0]    ; Reset

    b       .

    ENDP

    ;...

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  • 0 in reply to Clive Unspecified

    So I need to merge the DFU example code into IAP right?
    The flash loader tool is expecting a bin file which am not able to generate.
    UART1 tx,rx is connected with USB-TTY (com port) and trying to access the device but tool is not responding