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jefflongo
jefflongo
Associate III
January 11, 2020
Solved

BOOT0/NRST control with DTR/RTS

Is it possible to use the DTR/RTS pins of a UART bridge (such as FT232RL) to automate entering the bootloader in system memory for flashing firmware using STM32CubeProgrammer? Has anybody achieved this?

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jefflongo
jefflongoBest answer
Associate III
January 16, 2020

As it turns out, I discovered DTR (if inverted) can be used for BOOT0, and RTS for NRST. This didn't work properly in the GUI version, but in the command line interface it did in fact work.

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12 replies

jefflongo
jefflongoAuthorBest answer
Associate III
January 16, 2020

As it turns out, I discovered DTR (if inverted) can be used for BOOT0, and RTS for NRST. This didn't work properly in the GUI version, but in the command line interface it did in fact work.

    waclawek.jan
    waclawek.jan
    Super User
    January 16, 2020

    Thanks for the information.

    This really ought to go into the documentation ( @Imen DAHMEN​ can you please have a look at this); and also ought to work in the GUI.

    JW

    Imen.D
    ST Technical Moderator
    January 16, 2020

    Hello,

    I will raise this issue internally for check. We will come back to you soon with update.

    Best Regards,

    Imen

    In order to give better visibility on the answered topics, please click on 'Best answer' on the reply which solved your issue or answered your question. Thanks
    TVan .2
    TVan .2
    Associate II
    March 29, 2020

    @Imen DAHMEN​ any answer yet how to do this and with what tool? So auto reset and auto bootloader with dtr and rts?

    Pavel A.
    Pavel A.
    March 29, 2020

    For example, the H750 board from this thread has USB to RS232 adapter wired to NRST and BOOT0.

    The schema is posted in the thread.

    -- pa

    TVan .2
    TVan .2
    Associate II
    March 30, 2020

    Dear

    This is DTR and DTS, my FT234XD doesn't have those. Only RTS and DTR.

    Does this method work without any special software?

    Greetings

    Thomas Van Aken

    jefflongo
    jefflongoAuthor
    Associate III
    April 3, 2020

    I was able to find a solution by writing a program which uses the FT232R GPIO to control NRST and BOOT0, calling STM32CubeProgrammerCLI. Pretty good software independent solution to me.​

    TV_it
    TV_it
    Associate II
    November 26, 2021

    I know this is an old thread, but could somebody tell me if this works now in STM32CubeProgrammer? Or if the FT232R GPIO control program is available somewhere?

    jefflongo
    jefflongoAuthor
    Associate III
    November 26, 2021

    Hi,

    Not sure if this works in STM32CubeProgrammer yet, but I was able to come up with a workaround, see here: https://github.com/jefflongo/stm32handsfree

    TV_it
    TV_it
    Associate II
    November 27, 2021

    Does this work under windows too?

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