STM32 Composite Device (MSC+CDC)

[thefoxek]

Posted on October 15, 2015 at 14:46

I suffered a week and wrote all the same USB Composite device (MSC+CDC).

The point is this: I wrote Composite device MSC CDC. Everything is determined by the Manager, MSC works on both transmit and receive, but the CDC is only at the reception. Looked in a debugger, it looks as if HOST (PC) only generates a request to the endpoint MSC but the CDC does not endpoint polls. My descriptors Code:

__ALIGN_BEGIN uint8_t USBD_COMPOSITE_CfgDesc[USB_COMPOSITE_CONFIG_DESC_SIZ] __ALIGN_END =
{
0x09,
USB_DESC_TYPE_CONFIGURATION,
USB_COMPOSITE_CONFIG_DESC_SIZ,
0x00,
0x03, /*bNumInterfaces: 3 interfaces (2 for CDC, 1 for MSC)*/
0x01, /*bConfigurationValue: Configuration value*/
0x00, /*iConfiguration: Index of string descriptor */
0xC0, /*bmAttributes: bus powered and Support Remote Wake-up */
0x32, /*MaxPower 100 mA: this current is used for detecting Vbus*/
/******************** Mass Storage interface ********************/
0x09, /* bLength: Interface Descriptor size */
0x04, /* bDescriptorType: */
MSC_INTERFACE, /* bInterfaceNumber: Number of Interface */
0x00, /* bAlternateSetting: Alternate setting */
0x02, /* bNumEndpoints*/
0x08, /* bInterfaceClass: MSC Class */
0x06, /* bInterfaceSubClass : SCSI transparent*/
0x50, /* nInterfaceProtocol */
0x05, /* iInterface: */
/******************** Mass Storage Endpoints ********************/
0x07, /*Endpoint descriptor length = 7*/
0x05, /*Endpoint descriptor type */
MSC_IN_EP, /*Endpoint address (IN, address 3) */
0x02, /*Bulk endpoint type */
LOBYTE(MSC_MAX_PACKET),
HIBYTE(MSC_MAX_PACKET),
0x00, /*Polling interval in milliseconds */
0x07, /*Endpoint descriptor length = 7 */
0x05, /*Endpoint descriptor type */
MSC_OUT_EP, /*Endpoint address (OUT, address 3) */
0x02, /*Bulk endpoint type */
LOBYTE(MSC_MAX_PACKET),
HIBYTE(MSC_MAX_PACKET),
0x00, /*Polling interval in milliseconds*/
/******** /IAD should be positioned just before the CDC interfaces */
0x08, /* bLength */
0x0B, /* bDescriptorType */
0x01, /* bFirstInterface */
0x02, /* bInterfaceCount */
0x02, /* bFunctionClass */
0x02, /* bFunctionSubClass */
0x01, /* bFunctionProtocol */
0x00, /* iFunction (Index of string descriptor describing this function) */
/*Interface Descriptor */
0x09, /* bLength: Interface Descriptor size */
0x04, /* bDescriptorType: Interface */
CDC_COM_INTERFACE, /* bInterfaceNumber: Number of Interface */
0x00, /* bAlternateSetting: Alternate setting */
0x01, /* bNumEndpoints: One endpoints used */
0x02, /* bInterfaceClass: Communication Interface Class */
0x02, /* bInterfaceSubClass: Abstract Control Model */
0x01, /* bInterfaceProtocol: Common AT commands */
0x01, /* iInterface: */
/*Header Functional Descriptor*/
0x05, /* bLength: Endpoint Descriptor size */
0x24, /* bDescriptorType: CS_INTERFACE */
0x00, /* bDescriptorSubtype: Header Func Desc */
0x10, /* bcdCDC: spec release number */
0x01,
/*Call Management Functional Descriptor*/
0x05, /* bFunctionLength */
0x24, /* bDescriptorType: CS_INTERFACE */
0x01, /* bDescriptorSubtype: Call Management Func Desc */
0x03, /* bmCapabilities: D0+D1 */
0x02, /* bDataInterface: 2 */
/*ACM Functional Descriptor*/
0x04, /* bFunctionLength */
0x24, /* bDescriptorType: CS_INTERFACE */
0x02, /* bDescriptorSubtype: Abstract Control Management desc */
0x02, /* bmCapabilities */
/*Union Functional Descriptor*/
0x05, /* bFunctionLength */
0x24, /* bDescriptorType: CS_INTERFACE */
0x06, /* bDescriptorSubtype: Union func desc */
0x01, /* bMasterInterface: Communication class interface */
0x02, /* bSlaveInterface0: Data Class Interface */
/*Endpoint 2 Descriptor*/
0x07, /* bLength: Endpoint Descriptor size */
0x05, /* bDescriptorType: Endpoint */
CDC_CMD_EP, /* bEndpointAddress */
0x03, /* bmAttributes: Interrupt */
LOBYTE(CDC_CMD_PACKET_SZE), /* wMaxPacketSize: */
HIBYTE(CDC_CMD_PACKET_SZE),
0xFF, /* bInterval: */
/*Data class interface descriptor*/
0x09, /* bLength: Endpoint Descriptor size */
0x04, /* bDescriptorType: */
CDC_DATA_INTERFACE, /* bInterfaceNumber: /
0x00, /* bAlternateSetting: Alternate setting */
0x02, /* bNumEndpoints: Two endpoints used */
0x0A, /* bInterfaceClass: CDC */
0x00, /* bInterfaceSubClass: */
0x00, /* bInterfaceProtocol: */
0x00, /* iInterface: */
/*Endpoint OUT Descriptor*/
0x07, /* bLength: Endpoint Descriptor size */
0x05, /* bDescriptorType: Endpoint */
CDC_OUT_EP, /* bEndpointAddress */
0x02, /* bmAttributes: Bulk */
0x40, /* wMaxPacketSize: */
0x00,
0x01, /* bInterval: ignore for Bulk transfer */
/*Endpoint IN Descriptor*/
0x07, /* bLength: Endpoint Descriptor size */
0x05, /* bDescriptorType: Endpoint */
CDC_IN_EP, /* bEndpointAddress */
0x02, /* bmAttributes: Bulk */
0x40, /* wMaxPacketSize: */
0x00, 
0x01, /* bInterval */
};

#stm32 #usb #composite #device

[thefoxek]

Posted on October 30, 2015 at 11:18

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