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dhylands
dhylands
Associate
July 28, 2015
Question

Would like to enter DFU mode programmatically (on STM32F7)

  • July 28, 2015
  • 2 replies
  • 1097 views
Posted on July 28, 2015 at 03:27

Hi,

I have some code for entering DFU mode from my application which works on the STM32F4: https://github.com/micropython/micropython/blob/master/stmhal/modpyb.c#L70-L87

I'd like to do something equivalent on the STM32F7 (I have an STM32F7 Discovery board which has the STM32F746 MCU)

There doesn't seem to be any __HAL_SYSCFG_REMAPMEMORY_SYSTEMFLASH macro defined in the STMCubef7 files.

I'm able to successfully enter DFU mode by wiring in a switch between VCC and R42 (the BOOT0 line). I'd really like to be able to enter DFU mode without having to flip any switches.
    This topic has been closed for replies.

    2 replies

    Tesla DeLorean
    Tesla DeLorean
    Guru
    July 28, 2015
    Posted on July 28, 2015 at 05:04

    It doesn't have the same sort of mapping.

    The following would probably suffice: 

    // arm-none-eabi-gcc 4.9.0 does not correctly inline this
// MSP function, so we write it out explicitly here.
//__set_MSP(*((uint32_t*) 0x1FF00000));
__ASM volatile (''movs r3, #0x1FF00000
ldr r3, [r3, #0]
MSR msp, r3
'' : : : ''r3'', ''sp'');
((void (*)(void)) *((uint32_t*) 0x1FF00004))();

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    dhylands
    dhylandsAuthor
    Associate
    July 29, 2015
    Posted on July 29, 2015 at 19:44

    Thanks.

    I had to change it slightly. This seems to work: 

    // arm-none-eabi-gcc 4.9.0 does not correctly inline this
// MSP function, so we write it out explicitly here.
//__set_MSP(*((uint32_t*) 0x1FF00000));
__ASM 
volatile
(
''movw r3, #0x0000
movt r3, #0x1FF0
ldr r3, [r3, #0]
MSR msp, r3
''
: : : 
''r3''
, 
''sp''
);
((
void
(*)(
void
)) *((uint32_t*) 0x1FF00004))();

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