Stm32f105 don't enter dfu mode

[hisham23]

Posted on November 05, 2012 at 11:29

Hello,

I designed a board which contains stm32f105 microcontroller, and i want to use DFU as bootloader in order to download my program to the micro controller through usb port. I put BOOT0 =1, and BOOT1=0 PA10=PD6=PB5=0 then i powered the circuit and connected it to usb port of my pc which runs windows xp. But the pc didn't recognise a new device. These are the processor data: STM32F105 VCT6        Z 990TD   93 MYS 99 045 First question: Why the pc didn't recognize a new device? Second question: the date code is 045 what year does this mean? Regards, Hisham

[hisham23 · Accepted solution]

Posted on November 07, 2012 at 11:22

Hello,

Finally the problem is solved. I connected pin 1 of the usb (power =5v) from computer directly to USB_VBUS pin PA9 in stm32f105 instead of connecting it through 20kOhm resistor and it works!

[butasi]

I have the stm32f107 that has troubled me for the past few days. This resolved my issue.  Thanks from the future