STM32F407VG Bootloader via USART3

pramuka · ‎2014-10-23

Posted on October 23, 2014 at 16:37

Hello All,

We are using STM32F407VG & are having issues with bootloader via USART3 PC10/PC11. From the SW, we see that the processor is entering the bootloader mode.

When 0x7F is send, the processor responds with ''0x00 0x00 0x00'' instead of 0x79.

We are using BR-9600, 8Bit, Even parity & 1 stop bit. We have been struggling for over a week now & have no clue what we are missing. Looking for some help or guidance!

Thanks in advance.

#discovery #stm32 #stm32f4 #bootloader

Tesla DeLorean · ‎2014-10-23

Posted on October 23, 2014 at 16:49

How and to what are you connecting it? The STM32 uses CMOS Serial levels, these are not compatible with RS232 signalling levels.

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pramuka · ‎2014-10-23

Posted on October 23, 2014 at 23:33

Hi Clive1,

Thanks for your reply.

We are connected to a PC (Widnows 8) comp port.

On the STM32F4 side we are using TRS3223E. I have attached the circuit diagram as well for reference.

Thanks!