STM32F4 DFU Mbed 6

[tartavull]

My application requires flashing the firmware without pressing any buttons on the device. Therefore, I would like to be able to enter DFU mode from the application.

I'm using the code suggested in #8523 (comment)

main.c

#include "mbed.h"
extern "C" void enter_dfu();

int main() {
    DigitalOut usb_dp_pin(USB_OTG_FS_DP, 1) ;
    usb_dp_pin=0;

    enter_dfu();
}

bootloader.S

    AREA asm_func, CODE, READONLY
    EXPORT enter_dfu
enter_dfu
    LDR     R0, =0x40023844 ; RCC_APB2ENR
    LDR     R1, =0x00004000 ; ENABLE SYSCFG CLOCK
    STR     R1, [R0, #0]
     
    LDR     R0, =0x40013800 ; remap ROM at zero
    LDR     R1, =0x00000001 ; SYSCFG_MEMRMP
    STR     R1, [R0, #0]
       
    LDR     R0, =0x1FFF0000 ; ROM BASE
    LDR     SP,[R0, #0]     ; SP @ +0
    LDR     R0,[R0, #4]     ; PC @ +4
    BX      R0              ; Jump to Bootloader
    END

I'm using a custom target (which I verified it is working by blinking LEDs)
custom_targets.json

    "MTS_MDOT_F405RG": {
        "inherits": ["MCU_STM32"],
        "core": "Cortex-M4F",
        "extra_labels_add": ["STM32F4", "STM32F405RG"],
        "is_disk_virtual": true,
        "macros_add": ["HSE_VALUE=26000000"],
        "features_add": ["BOOTLOADER"],
        "device_has_add": ["ANALOGOUT", "MPU"],
        "release_versions": ["2", "5"],
        "device_name": "STM32F405RG",
        "bootloader_suported": true,
	"device_has_remove": ["SERIAL_FC"]
    }
}

I'm compiling using ARMC6 with mbed-studio and using
commit 0c6753b (HEAD -> latest, tag: mbed-os-6.7.0-rc1, tag: mbed-os-6.7.0, origin/latest)

The device doesn't enter DFU mode, I would appreciate any pointers.

[ciarmcom]

@tartavull This issue has an incomplete or old issue template.For future reference please use an up to date clone of the repository before raising issues. Many thanks.

[ciarmcom]

Thank you for raising this detailed GitHub issue. I am now notifying our internal issue triagers.
Internal Jira reference: https://jira.arm.com/browse/IOTOSM-3503

[tartavull]

Is there any information I can add here?

[0xc0170]

@tartavull If you can update the above to use the default template (we parse the information internally). Thanks

@ARMmbed/team-multitech Please review

[0xc0170]

@ARMmbed/team-st-mcd might help with DFU mode as well?

[jeromecoutant]

Maybe you can try to add a little delay before setting usb_dp_pin to 0 ?

[DheerN]

Added a 1s delay before setting usb_dp_pin to 0. Didn't seem to make a difference. Any other solutions?

[jeromecoutant]

For USB, I am waiting 10ms:
https://github.com/ARMmbed/mbed-os/blob/master/targets/TARGET_STM/USBPhy_STM32.cpp#L200

[DheerN]

10ms delay hasn't worked either.

[JojoS62]

what about the interrupt vector table, is it necessary to reset the SCB->VTOR ? It is set to ram in platform/source/mbed_sdk_boot.c

[tartavull]

This can be closed, we got it working. Thanks a lot for the help!

[jeromecoutant]

@tartavull maybe you could add few details to help community in the future ? :-)

[btply]

@tartavull Could you share your solution please? I'm also having the same issue

[tartavull]

We "solved it" by using some external circuitry.

…

On Wed., May 5, 2021, 9:55 a.m. Billy Topley, ***@***.***> wrote: @tartavull <https://github.com/tartavull> Could you share your solution please? I'm also having the same issue — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#14320 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABDOZZSRYH7OGJ3Y4QXGRV3TMFE5ZANCNFSM4YAX47WQ> .