Question
STM32F042K6 USB init. for VCP com. - ''This device cannot start (code 10)''
Posted on January 15, 2015 at 12:39
Hi all,
I have a problem with USB initialization for VCP communication using STM32F042K6. I used STSW-STM32092 package for F072 (Virtual_COM_Port file). I create my own board at this moment mounted on breadboard - 2x33�F for XTAL (not have 5-20
�F
).
Firstly there was a problem in function USBD_Init ->
DCD_DevConnect -> *BCDR|=BCDR
_
DPPU - enabling pull-up resistor on USB DP line - always got into
HardFault
_
Handler, therefore I add external 1k5 resistor and now the device is recognized as FS device in my Win7 as intended, but still shows ''
This device cannot start (code 10)
''.
What I have already tried:
� I changed startup file for appropriate.
� I tried to change the value of Stack_Size and Heap_Size.
� I tried increasing & decreasing values in usbd_conf.h, usb_conf.h:
Endpoint IN & OUT Packet Size, max string
Descriptor Size, number of Endpoints used by the device etc.
� Clock setting is configured (LEDs blink).
So my question is, what should I do to figure it out? Secondly, why there is the problem with enabling pull-up on DP line? Thanks in advance.Jan #stm32f0 #vcp #cdc #usb #stm32