STM32组合设备实现USB转双串口

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  • Post category:其他


USB转双串口,核心技术就在于组合设备(USB Composite)的实现,组合设备的实现,其核心技术在于描述符的实现,下面我们先给出描述符:

设备描述符

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__ALIGN_BEGIN uint8_t USBD_DeviceDesc[USB_SIZ_DEVICE_DESC] __ALIGN_END =



{




0x12,


/*bLength */



USB_DEVICE_DESCRIPTOR_TYPE,


/*bDescriptorType*/



0x00,


/*bcdUSB */



0x02,

#ifdef DUAL_COM



0xEF,


/*bDeviceClass*/



0x02,


/*bDeviceSubClass*/



0x01,


/*bDeviceProtocol*/

#else



0x00,


/*bDeviceClass*/



0x00,


/*bDeviceSubClass*/



0x00,


/*bDeviceProtocol*/

#endif



USB_OTG_MAX_EP0_SIZE,


/*bMaxPacketSize*/



LOBYTE(USBD_VID),


/*idVendor*/



HIBYTE(USBD_VID),


/*idVendor*/



LOBYTE(USBD_PID),


/*idVendor*/



HIBYTE(USBD_PID),


/*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_CFG_MAX_NUM


/*bNumConfigurations*/



} ;


/* USB_DeviceDescriptor */


注意:双串口需要全局定义DUAL_COM宏

配置描述符是重中之重

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__ALIGN_BEGIN uint8_t usbd_cdc_CfgDesc[USB_CDC_CONFIG_DESC_SIZ]  __ALIGN_END =

{




/*Configuration Descriptor*/



0x09,


/* bLength: Configuration Descriptor size */



USB_CONFIGURATION_DESCRIPTOR_TYPE,


/* bDescriptorType: Configuration */



USB_CDC_CONFIG_DESC_SIZ,


/* wTotalLength:no of returned bytes */



0x00,

#ifdef DUAL_COM



0x04,


/* bNumInterfaces: 4 interface */

#else



0x02,


/* bNumInterfaces: 2 interface */

#endif



0x01,


/* bConfigurationValue: Configuration value */



0x00,


/* iConfiguration: Index of string descriptor describing the configuration */



0x60,


/* bmAttributes: self powered */



0xFA,


/* MaxPower 0 mA */




/*---------------------------------------------------------------------------*/

#ifdef DUAL_COM



// IAD



0x08,


// bLength: Interface Descriptor size



0x0B,


// bDescriptorType: IAD



0x00,


// bFirstInterface



0x02,


// bInterfaceCount



0x02,


// bFunctionClass: CDC



0x02,


// bFunctionSubClass



0x01,


// bFunctionProtocol



0x02,


// iFunction

#endif



/*Interface Descriptor */



0x09,


/* bLength: Interface Descriptor size */



USB_INTERFACE_DESCRIPTOR_TYPE,


/* bDescriptorType: Interface */



/* Interface descriptor type */



0x00,


/* 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 */



0x00,


/* 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 */



0x00,


/* bmCapabilities: D0+D1 */



0x01,


/* bDataInterface: 1 */




/*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 */



0x00,


/* bMasterInterface: Communication class interface */



0x01,


/* bSlaveInterface0: Data Class Interface */




/*Endpoint 2 Descriptor*/



0x07,


/* bLength: Endpoint Descriptor size */



USB_ENDPOINT_DESCRIPTOR_TYPE,


/* 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 */



USB_INTERFACE_DESCRIPTOR_TYPE,


/* bDescriptorType: */



0x01,


/* bInterfaceNumber: Number of Interface */



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 */



USB_ENDPOINT_DESCRIPTOR_TYPE,


/* bDescriptorType: Endpoint */



CDC_OUT_EP,


/* bEndpointAddress */



0x02,


/* bmAttributes: Bulk */



LOBYTE(CDC_DATA_MAX_PACKET_SIZE),


/* wMaxPacketSize: */



HIBYTE(CDC_DATA_MAX_PACKET_SIZE),



0x00,


/* bInterval: ignore for Bulk transfer */




/*Endpoint IN Descriptor*/



0x07,


/* bLength: Endpoint Descriptor size */



USB_ENDPOINT_DESCRIPTOR_TYPE,


/* bDescriptorType: Endpoint */



CDC_IN_EP,


/* bEndpointAddress */



0x02,


/* bmAttributes: Bulk */



LOBYTE(CDC_DATA_MAX_PACKET_SIZE),


/* wMaxPacketSize: */



HIBYTE(CDC_DATA_MAX_PACKET_SIZE),



0x00,


/* bInterval: ignore for Bulk transfer */


#ifdef DUAL_COM



// IAD



0x08,


// bLength: Interface Descriptor size



0x0B,


// bDescriptorType: IAD



0x02,


// bFirstInterface



0x02,


// bInterfaceCount



0x02,


// bFunctionClass: CDC



0x02,


// bFunctionSubClass



0x01,


// bFunctionProtocol



0x02,


// iFunction



/*Interface Descriptor */



0x09,


/* bLength: Interface Descriptor size */



USB_INTERFACE_DESCRIPTOR_TYPE,


/* bDescriptorType: Interface */



/* Interface descriptor type */



0x02,


/* 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 */



0x00,


/* 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 */



0x00,


/* bmCapabilities: D0+D1 */



0x01,


/* bDataInterface: 1 */




/*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 */



0x00,


/* bMasterInterface: Communication class interface */



0x01,


/* bSlaveInterface0: Data Class Interface */




/*Endpoint 2 Descriptor*/



0x07,


/* bLength: Endpoint Descriptor size */



USB_ENDPOINT_DESCRIPTOR_TYPE,


/* 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 */



USB_INTERFACE_DESCRIPTOR_TYPE,


/* bDescriptorType: */



0x03,


/* bInterfaceNumber: Number of Interface */



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 */



USB_ENDPOINT_DESCRIPTOR_TYPE,


/* bDescriptorType: Endpoint */



CDC_OUT_EP_EX,


/* bEndpointAddress */



0x02,


/* bmAttributes: Bulk */



LOBYTE(CDC_DATA_MAX_PACKET_SIZE),


/* wMaxPacketSize: */



HIBYTE(CDC_DATA_MAX_PACKET_SIZE),



0x00,


/* bInterval: ignore for Bulk transfer */




/*Endpoint IN Descriptor*/



0x07,


/* bLength: Endpoint Descriptor size */



USB_ENDPOINT_DESCRIPTOR_TYPE,


/* bDescriptorType: Endpoint */



CDC_IN_EP_EX,


/* bEndpointAddress */



0x02,


/* bmAttributes: Bulk */



LOBYTE(CDC_DATA_MAX_PACKET_SIZE),


/* wMaxPacketSize: */



HIBYTE(CDC_DATA_MAX_PACKET_SIZE),



0x00


/* bInterval: ignore for Bulk transfer */

#endif

} ;


这两个搞定,其他就是USB处理的细节问题了,包括端点的初始化,端点地址分配,数据发送接收的处理等,具体处理和实现程序可参考附件的工程源码。

成功安装驱动

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设备管理器里面的信息

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单片机程序源码: <ignore_js_op>



Ginkgo_USB_COM.rar


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PC端的驱动安装引导程序: <ignore_js_op>



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