2019-02-27 08:23 AM
Hy,
I'm trying to run the DFU mode with a STM32F205. When I put boot0 to VCC and I do a reset, the DFU USB was not detected by my computer. Can someone help me ?
I tried before that on the nucleo card F207ZG and this work corectly.
2019-02-27 09:09 AM
Check levels on USB pins, and make sure D+/D- not swapped.
Does USB work from your own code loads?
Do you have an 8 MHz crystal or clock source?
2019-02-27 11:58 PM
USB in my own code works correctly. And I have a 6MHz crystal.
2019-02-28 01:38 AM
2019-02-28 02:26 AM
I believe it looks for a bias on the pins.
Is 6 MHz a supported frequency per AN2606? Does it start quick enough?
2019-02-28 02:50 AM
AN2606 say "An external clock multiple of 1MHz (between 4 and 26MHz) is required for CAN and DFU bootloader execution after the selection phase." So normaly 6MHz is supported.