Stm32f105 don't enter dfu mode

hisham23 · ‎2012-11-05

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 · ‎2012-11-07

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!