stm32制作CAN适配器4--WinUsb的使用

前面使用STM32G474芯片的USB模块做了一个CANFD程序，当时用的是HID模式，在实际使用时发现HID模块的通讯速率太慢了，只能1ms传输一帧，就会造成有些掉帧现象。 现在就把HID模块改为在Window下同样免驱的WinUsb来实现CANFD数据的传输。 首先使用STM32CubeMX配置端口与时钟

采用外部晶振12M

USB第三方库选CDC模式
到此配置完成，点击生成代码，在生成的代码中更改以下内容实现WinUSB驱动 。

在usbd_desc.c中增加Winusb的特有字符描述

#if (USBD_SUPPORT_WINUSB==1)
const uint8_t USBD_OS_STRING[8] = { 'M','S','F','T','1','0','0',0xA0U,//USB_REQ_MS_VENDOR_CODE,
}; uint8_t *USBD_WinUSBOSStrDescriptor(uint16_t *length)
{USBD_GetString((uint8_t *)USBD_OS_STRING, USBD_StrDesc, length);return USBD_StrDesc;
}#define USB_LEN_OS_FEATURE_DESC 0x28
__ALIGN_BEGIN uint8_t USBD_WINUSB_OSFeatureDesc[USB_LEN_OS_FEATURE_DESC] __ALIGN_END =
{0x28, 0, 0, 0, // length0, 1,          // bcd version 1.04, 0,          // windex: extended compat ID descritor1,             // no of function0, 0, 0, 0, 0, 0, 0, // reserve 7 bytes// function0,             // interface no0,             // reserved'W', 'I', 'N', 'U', 'S', 'B', 0, 0, //  first ID0,   0,   0,   0,   0,   0, 0, 0,  // second ID0,   0,   0,   0,   0,   0 // reserved 6 bytes
};uint8_t *USBD_WinUSBOSFeatureDescriptor(uint16_t *length)
{*length = USB_LEN_OS_FEATURE_DESC;return USBD_WINUSB_OSFeatureDesc;
}#define USB_LEN_OS_PROPERTY_DESC 0x8E
__ALIGN_BEGIN uint8_t USBD_WINUSB_OSPropertyDesc[USB_LEN_OS_PROPERTY_DESC] __ALIGN_END =
{0x8E, 0, 0, 0,  // length 246 byte0x00, 0x01,   // BCD version 1.00x05, 0x00,   // Extended Property Descriptor Index(5)0x01, 0x00,   // number of section (1)//; property section0x84, 0x00, 0x00, 0x00,   // size of property section0x1, 0, 0, 0,   //; property data type (1)0x28, 0,        //; property name length (42)'D', 0,'e', 0,'v', 0,'i', 0,'c', 0,'e', 0,'I', 0,'n', 0,'t', 0,'e', 0,'r', 0,'f', 0,'a', 0,'c', 0,'e', 0,'G', 0,'U', 0,'I', 0,'D', 0,0, 0,// 13eb360b-bc1e-46cb-ac8b-ef3da470x4E, 0, 0, 0,  // ; property data length'{', 0,'1', 0,'3', 0,'E', 0,'B', 0,'3', 0,'6', 0,'0', 0,'B', 0,'-', 0,'B', 0,'C', 0,'1', 0,'E', 0,'-', 0,'4', 0,'6', 0,'C', 0,'B', 0,'-', 0,'A', 0,'C', 0,'8', 0,'B', 0,'-', 0,'E', 0,'F', 0,'3', 0,'D', 0,'A', 0,'4', 0,'7', 0,'B', 0,'4', 0,'0', 0,'6', 0,'2', 0,'}', 0,0, 0,};
uint8_t *USBD_WinUSBOSPropertyDescriptor(uint16_t *length)
{*length = USB_LEN_OS_PROPERTY_DESC;return USBD_WINUSB_OSPropertyDesc;
}
#endif // (USBD_SUPPORT_WINUSB==1)

在usbd_ctlreq.c中static void USBD_GetDescriptor(USBD_HandleTypeDef *pdev, USBD_SetupReqTypedef *req)增加case 0xEE。

#if (USBD_SUPPORT_WINUSB==1)case 0xEE: // OS String if (pdev->pClass->GetWinUSBOSDescriptor != NULL){pbuf = pdev->pClass->GetWinUSBOSDescriptor(&len);}else{USBD_CtlError(pdev, req);err++;}  break;
#endif // (USBD_SUPPORT_WINUSB==1)USBD_DescriptorsTypeDef CDC_Desc =
{USBD_CDC_DeviceDescriptor,USBD_CDC_LangIDStrDescriptor,USBD_CDC_ManufacturerStrDescriptor,USBD_CDC_ProductStrDescriptor,USBD_CDC_SerialStrDescriptor,USBD_CDC_ConfigStrDescriptor,USBD_CDC_InterfaceStrDescriptor,USBD_WinUSBOSFeatureDescriptor,
USBD_WinUSBOSPropertyDescriptor,
};

在usbd_def.h中USBD_ClassTypeDef和USBD_DescriptorsTypeDef增加winusb描述

typedef struct _Device_cb
{uint8_t (*Init)(struct _USBD_HandleTypeDef *pdev, uint8_t cfgidx);uint8_t (*DeInit)(struct _USBD_HandleTypeDef *pdev, uint8_t cfgidx);/* Control Endpoints*/uint8_t (*Setup)(struct _USBD_HandleTypeDef *pdev, USBD_SetupReqTypedef  *req);uint8_t (*EP0_TxSent)(struct _USBD_HandleTypeDef *pdev);uint8_t (*EP0_RxReady)(struct _USBD_HandleTypeDef *pdev);/* Class Specific Endpoints*/uint8_t (*DataIn)(struct _USBD_HandleTypeDef *pdev, uint8_t epnum);uint8_t (*DataOut)(struct _USBD_HandleTypeDef *pdev, uint8_t epnum);uint8_t (*SOF)(struct _USBD_HandleTypeDef *pdev);uint8_t (*IsoINIncomplete)(struct _USBD_HandleTypeDef *pdev, uint8_t epnum);uint8_t (*IsoOUTIncomplete)(struct _USBD_HandleTypeDef *pdev, uint8_t epnum);uint8_t  *(*GetHSConfigDescriptor)(uint16_t *length);uint8_t  *(*GetFSConfigDescriptor)(uint16_t *length);uint8_t  *(*GetOtherSpeedConfigDescriptor)(uint16_t *length);uint8_t  *(*GetDeviceQualifierDescriptor)(uint16_t *length);
#if (USBD_SUPPORT_USER_STRING_DESC == 1U)uint8_t  *(*GetUsrStrDescriptor)(struct _USBD_HandleTypeDef *pdev, uint8_t index,  uint16_t *length);
#endif
#if (USBD_SUPPORT_WINUSB == 1) uint8_t  *(*GetWinUSBOSDescriptor)(uint16_t *length); 
#endif  } USBD_ClassTypeDef;/* USB Device descriptors structure */
typedef struct
{uint8_t *(*GetDeviceDescriptor)(USBD_SpeedTypeDef speed, uint16_t *length);uint8_t *(*GetLangIDStrDescriptor)(USBD_SpeedTypeDef speed, uint16_t *length);uint8_t *(*GetManufacturerStrDescriptor)(USBD_SpeedTypeDef speed, uint16_t *length);uint8_t *(*GetProductStrDescriptor)(USBD_SpeedTypeDef speed, uint16_t *length);uint8_t *(*GetSerialStrDescriptor)(USBD_SpeedTypeDef speed, uint16_t *length);uint8_t *(*GetConfigurationStrDescriptor)(USBD_SpeedTypeDef speed, uint16_t *length);uint8_t *(*GetInterfaceStrDescriptor)(USBD_SpeedTypeDef speed, uint16_t *length);
#if (USBD_CLASS_USER_STRING_DESC == 1)uint8_t *(*GetUserStrDescriptor)(USBD_SpeedTypeDef speed, uint8_t idx, uint16_t *length);
#endif
#if ((USBD_LPM_ENABLED == 1U) || (USBD_CLASS_BOS_ENABLED == 1))uint8_t *(*GetBOSDescriptor)(USBD_SpeedTypeDef speed, uint16_t *length);
#endif
#if (USBD_SUPPORT_WINUSB==1)uint8_t *(*GetWinUSBOSFeatureDescriptor)(uint16_t *length);uint8_t *(*GetWinUSBOSPropertyDescriptor)(uint16_t *length);
#endif
} USBD_DescriptorsTypeDef;

在usbd_cdc.c中的static uint8_t USBD_CDC_Setup(USBD_HandleTypeDef *pdev,
USBD_SetupReqTypedef *req)更改为下面

#define WINUSB_CONFIG_DESC_SIZE 32
__ALIGN_BEGIN uint8_t USBD_CDC_CfgHSDesc[WINUSB_CONFIG_DESC_SIZE] __ALIGN_END =
{/*Configuration Descriptor*/0x09,   /* bLength: Configuration Descriptor size */USB_DESC_TYPE_CONFIGURATION,      /* bDescriptorType: Configuration */WINUSB_CONFIG_DESC_SIZE,                /* wTotalLength:no of returned bytes */0x00,0x01,   /* bNumInterfaces: 1 interface for WINUSB */0x01,   /* bConfigurationValue: Configuration value */USBD_IDX_CONFIG_STR,   /* iConfiguration: Index of string descriptor describing the configuration */0xC0,   /* bmAttributes: self powered */0x32,   /* MaxPower 50*2 mA *//*---------------------------------------------------------------------------*//*Data class interface descriptor*/0x09,   /* bLength: Endpoint Descriptor size */USB_DESC_TYPE_INTERFACE,  /* bDescriptorType: */0x00,   /* bInterfaceNumber: Number of Interface, zero based index of this interface */0x00,   /* bAlternateSetting: Alternate setting */0x02,   /* bNumEndpoints: Two endpoints used */0xff,   /* bInterfaceClass: vendor */
//  0x00,   /* bInterfaceClass: vendor */0x00,   /* bInterfaceSubClass: */0x00,   /* bInterfaceProtocol: */0x00,   /* iInterface: *//*Endpoint OUT Descriptor*/0x07,   /* bLength: Endpoint Descriptor size */USB_DESC_TYPE_ENDPOINT,      /* bDescriptorType: Endpoint */CDC_OUT_EP,                        /* bEndpointAddress */0x02,                              /* bmAttributes: Bulk */LOBYTE(CDC_DATA_HS_MAX_PACKET_SIZE),  /* wMaxPacketSize: */HIBYTE(CDC_DATA_HS_MAX_PACKET_SIZE),0x00,                              /* bInterval: ignore for Bulk transfer *//*Endpoint IN Descriptor*/0x07,   /* bLength: Endpoint Descriptor size */USB_DESC_TYPE_ENDPOINT,      /* bDescriptorType: Endpoint */CDC_IN_EP,                         /* bEndpointAddress */0x02,                              /* bmAttributes: Bulk */LOBYTE(CDC_DATA_HS_MAX_PACKET_SIZE),  /* wMaxPacketSize: */HIBYTE(CDC_DATA_HS_MAX_PACKET_SIZE),0x00                               /* bInterval: ignore for Bulk transfer */
} ;__ALIGN_BEGIN uint8_t USBD_CDC_CfgFSDesc[WINUSB_CONFIG_DESC_SIZE] __ALIGN_END =
{/*Configuration Descriptor*/0x09,   /* bLength: Configuration Descriptor size */USB_DESC_TYPE_CONFIGURATION,      /* bDescriptorType: Configuration */WINUSB_CONFIG_DESC_SIZE,                /* wTotalLength:no of returned bytes */0x00,0x01,   /* bNumInterfaces: 1 interface for Game IO */0x01,   /* bConfigurationValue: Configuration value */USBD_IDX_CONFIG_STR,   /* iConfiguration: Index of string descriptor describing the configuration */0xC0,   /* bmAttributes: self powered */0x32,   /* MaxPower 0 mA *//*---------------------------------------------------------------------------*//*Data class interface descriptor*/0x09,   /* bLength: Endpoint Descriptor size */USB_DESC_TYPE_INTERFACE,  /* bDescriptorType: */0x00,   /* bInterfaceNumber: Number of Interface, zero based index of this interface */0x00,   /* bAlternateSetting: Alternate setting */0x02,   /* bNumEndpoints: Two endpoints used */0xff,   /* bInterfaceClass: vendor */
//  0x00,   /* bInterfaceClass: vendor */0x00,   /* bInterfaceSubClass: */0x00,   /* bInterfaceProtocol: */0x00,   /* iInterface: *//*Endpoint OUT Descriptor*/0x07,   /* bLength: Endpoint Descriptor size */USB_DESC_TYPE_ENDPOINT,      /* bDescriptorType: Endpoint */CDC_OUT_EP,                        /* bEndpointAddress */0x02,                              /* bmAttributes: Bulk */LOBYTE(CDC_DATA_FS_MAX_PACKET_SIZE),  /* wMaxPacketSize: */HIBYTE(CDC_DATA_FS_MAX_PACKET_SIZE),0x00,                              /* bInterval: ignore for Bulk transfer *//*Endpoint IN Descriptor*/0x07,   /* bLength: Endpoint Descriptor size */USB_DESC_TYPE_ENDPOINT,      /* bDescriptorType: Endpoint */CDC_IN_EP,                         /* bEndpointAddress */0x02,                              /* bmAttributes: Bulk */LOBYTE(CDC_DATA_FS_MAX_PACKET_SIZE),  /* wMaxPacketSize: */HIBYTE(CDC_DATA_FS_MAX_PACKET_SIZE),0x00                               /* bInterval: ignore for Bulk transfer */
} ;    void USBD_WinUSBGetDescriptor(USBD_HandleTypeDef *pdev, USBD_SetupReqTypedef *req)
{uint16_t len;uint8_t *pbuf;switch (req->wIndex){ case 0x04: // compat IDpbuf = pdev->pDesc->GetWinUSBOSFeatureDescriptor(&len);break;case 0x05:pbuf = pdev->pDesc->GetWinUSBOSPropertyDescriptor(&len);break;default: USBD_CtlError(pdev , req);return;}if((len != 0)&& (req->wLength != 0)){len = MIN(len , req->wLength);USBD_CtlSendData (pdev, pbuf,len);}
} static uint8_t USBD_CDC_Setup(USBD_HandleTypeDef *pdev,USBD_SetupReqTypedef *req)
{USBD_StatusTypeDef ret = USBD_OK;if(req->bRequest == 0xA0){USBD_WinUSBGetDescriptor( pdev, req ); return USBD_OK;}if(req->bmRequest == 0xC1) {USBD_WinUSBGetDescriptor( pdev, req ); return USBD_OK;}return (uint8_t)ret;
}

编译驱动成功！

网盘：https://pan.baidu.com/s/1nIK4ig2TW4pdCfUxiYL6VA?pwd=1234