stm32 usb cdc Device Descriptor Request Failed

txmsszd · ‎2016-06-16

Posted on June 16, 2016 at 19:19

hi,I am tring to use usb virtual port to transmit data to pc.

MCU：STM32F373 100pins

cubemx: usb device fs checked

usb:communication device class

PC: windows 10

heap size: 0x200

stack size :0x400

when i plug usb cable to pc,it can not be recognised.In device manager,it shows Device Descriptor Request Failed. ST VCP driver installed. BTW, when I debug it, it could goes into USB_LP_IRQHandler after MX_USB_DEVICE_Init() excuted.

thanks.

slimen · ‎2016-06-16

Posted on June 17, 2016 at 01:00

Hi,

You can refer to this

https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/STM32F042%20USB%20VCP%20not%20working&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B&currentviews=311

, it may be helpful

Regards

slimen · ‎2016-06-17

Posted on June 17, 2016 at 11:03

Hi,

Could you please precise which versions of CubeMx and firmware are you using ?

Regards

txmsszd · ‎2016-06-17

Posted on June 18, 2016 at 04:20

Hi,

CubeMx Version: 4.15.1,and the firmware is downloaded by Cube itself,should be the latest.

txmsszd · ‎2016-06-17

Posted on June 18, 2016 at 04:36

Thanks

I have noticed this discussion before my post,I checked the points the topic referred.But it help less to my problem

txmsszd · ‎2016-06-18

Posted on June 18, 2016 at 14:54

update..

I found that it frequently goes into HAL_PCD_IRQHandler,typed as ESOF,which means Expected Start Of Frame.And when I try to send some data via CDC_Transmit_FS function,the hcdc->TxState is always busy state.

I have tried sevral ways to work it outï¼Œbut problem remains.

Need help.

txmsszd · ‎2016-06-18

Posted on June 18, 2016 at 16:52

Some inforamtion about configuration foe USB CDC.Generated by CUBEMX

Basic Parameters:

USBD_MAX_NUM_INTERFACES (Maximum number of supported interfaces) 1

USBD_MAX_NUM_CONFIGURATION (Maximum number of supported configuration) 1

USBD_MAX_STR_DESC_SIZ (Maximum size for the string descriptors) 512

USBD_SUPPORT_USER_STRING (Enable user string descriptor) Disabled

USBD_SELF_POWERED (Enabled self power) Enabled

USBD_DEBUG_LEVEL (USBD Debug Level) 0: No debug message

Class Parameters:

USBD_CDC_INTERVAL (Number of micro-frames interval) 1000

Device Descriptor:

VID (Vendor IDentifier) 1155

LANGID_STRING (Language Identifier) English(United States)

MANUFACTURER_STRING (Manufacturer Identifier) STMicroelectronics

Device Descriptor FS:

PID (Product IDentifier) 22336

PRODUCT_STRING (Product Identifier) STM32 Virtual ComPort

SERIALNUMBER_STRING (Serial number) 00000000001A

CONFIGURATION_STRING (Configuration Identifier) CDC Config

INTERFACE_STRING (Interface Identifier) CDC Interfac

slimen · ‎2016-06-21

Posted on June 21, 2016 at 10:40

Hi,

Are you using CDC example from Cube package ?

Could you please give me the DeviceClass and DeviceSubClass values ?

Regards

txmsszd · ‎2016-06-23

Posted on June 23, 2016 at 15:53

Hi,these code was generated by CUBEMX automaticly.

I am new to USB CDC,I find no DeviceSubClass item in my project.What I found is listed below,I don't know if it is the DeviceClass you mentioned.

Thansk.

__ALIGN_BEGIN uint8_t USBD_FS_DeviceDesc[USB_LEN_DEV_DESC] __ALIGN_END =

{

0x12, /*bLength */

USB_DESC_TYPE_DEVICE, /*bDescriptorType*/

0x00, /* bcdUSB */

0x02,

0x02, /*bDeviceClass*/

0x02, /*bDeviceSubClass*/

0x00, /*bDeviceProtocol*/

USB_MAX_EP0_SIZE, /*bMaxPacketSize*/

LOBYTE(USBD_VID), /*idVendor*/

HIBYTE(USBD_VID), /*idVendor*/

LOBYTE(USBD_PID_FS), /*idVendor*/

HIBYTE(USBD_PID_FS), /*idVendor*/

0x00, /*bcdDevice rel. 2.00*/

0x02,

USBD_IDX_MFC_STR, /*Index of manufacturer string*/

USBD_IDX_PRODUCT_STR, /*Index of product string*/

USBD_IDX_SERIAL_STR, /*Index of serial number string*/

USBD_MAX_NUM_CONFIGURATION /*bNumConfigurations*/

} ;

slimen · ‎2016-06-24

Posted on June 24, 2016 at 12:42

Hi,

May be you should try with compatibility mode settings for windows 7/8 .

Regards