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STM32CubeMx生成的USB CDC代码修改为WINUSB设备

码峰
2023-04-19 / 0 评论 / 0 点赞 / 1,272 阅读 / 1,335 字 / 正在检测是否收录...
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前言

WINUSB在Windows中是可以免驱的,那HID也是免驱的,用HID不是一样吗?不一样! HID采用中断传输,传输速度上不去,如果是使用的是USB2.0 FULL speed,那速度更低,可能很多场合都满足不了了。但是WINUSB就不一样了,winusb可以采用批量传输,数据吞吐量大大提高。(HID理论速度:10001964Byte/s, 1ms传输1次, 1次传输19个DAT事务, 1个DAT事务最大64B,好像也不慢了),下面就介绍一下STM32如何在CDC设备的基础上修改为WINUSB设备。

关于如何对WINUSB进行DEBUG

请注意,Windows仅查询OS字符串描述符一次,在开发过程中会造成麻烦。OS描述符存储在注册表中
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\UsbFlags\VVVVPPPPRRRR
(VVVV - VID; PPPP - PID; RRRR - 版本号)
请删除你USB设备对应的注册表项,然后使用USBDeview卸载设备,以便始终获得新的设备插入行为。

Src/usbd_desc.c

第128行,USBD_SUPPORT_USER_STRING_DESC后添加

#if (USBD_SUPPORT_WINUSB==1)
uint8_t *USBD_WinUSBOSStrDescriptor(uint16_t *length);
uint8_t *USBD_WinUSBOSFeatureDescriptor(uint16_t *length);
uint8_t *USBD_WinUSBOSPropertyDescriptor(uint16_t *length);
#endif // (USBD_SUPPORT_WINUSB==1)

USBD_DescriptorsTypeDef FS_Desc中,最后的地方添加

#if (USBD_SUPPORT_WINUSB == 1) 
, USBD_WinUSBOSFeatureDescriptor
, USBD_WinUSBOSPropertyDescriptor
#endif // (USBD_SUPPORT_WINUSB==1)

/* USB_DeviceDescriptor */后添加

#define USB_LEN_OS_FEATURE_DESC 0x28
#if defined ( __ICCARM__ ) /* IAR Compiler */
  #pragma data_alignment=4
#endif /* defined ( __ICCARM__ ) */

__ALIGN_BEGIN uint8_t USBD_WINUSB_OSFeatureDesc[USB_LEN_OS_FEATURE_DESC] __ALIGN_END =
{
   0x28, 0, 0, 0, // length
   0, 1,          // bcd version 1.0
   4, 0,          // windex: extended compat ID descritor
   1,             // no of function
   0, 0, 0, 0, 0, 0, 0, // reserve 7 bytes
// function
   0,             // interface no
   0,             // reserved
   'W', 'I', 'N', 'U', 'S', 'B', 0, 0, //  first ID
     0,   0,   0,   0,   0,   0, 0, 0,  // second ID
     0,   0,   0,   0,   0,   0 // reserved 6 bytes      
};
#define USB_LEN_OS_PROPERTY_DESC 0x8E
#if defined ( __ICCARM__ ) /* IAR Compiler */
  #pragma data_alignment=4
#endif /* defined ( __ICCARM__ ) */
__ALIGN_BEGIN uint8_t USBD_WINUSB_OSPropertyDesc[USB_LEN_OS_PROPERTY_DESC] __ALIGN_END =
{
      0x8E, 0, 0, 0,  // length 246 byte
      0x00, 0x01,   // BCD version 1.0
      0x05, 0x00,   // Extended Property Descriptor Index(5)
      0x01, 0x00,   // number of section (1)
//; property section        
      0x84, 0x00, 0x00, 0x00,   // size of property section
      0x1, 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,
      // D6805E56-0447-4049-9848-46D6B2AC5D28
      0x4E, 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,
      
};

在文件末尾添加

#if (USBD_SUPPORT_WINUSB==1)
const uint8_t USBD_OS_STRING[8] = { 
   'M',
   'S',
   'F',
   'T',
   '1',
   '0',
   '0',
   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;
}
uint8_t *USBD_WinUSBOSFeatureDescriptor(uint16_t *length)
{
  *length = USB_LEN_OS_FEATURE_DESC;
  return USBD_WINUSB_OSFeatureDesc;
}
uint8_t *USBD_WinUSBOSPropertyDescriptor(uint16_t *length)
{
  *length = USB_LEN_OS_PROPERTY_DESC;
   return USBD_WINUSB_OSPropertyDesc;
}
#endif // (USBD_SUPPORT_WINUSB==1)

Inc/usbd_conf.h

在文件中添加

#define USBD_SUPPORT_WINUSB       1

Middlewares/ST/STM32_USB_Device_Library/Core/Src/usbd_ctlreq.c

static uint8_t USBD_GetLen(uint8_t *buf);后添加

#if (USBD_SUPPORT_WINUSB==1)
static void USBD_WinUSBGetDescriptor(USBD_HandleTypeDef *pdev, USBD_SetupReqTypedef *req);
#endif // (USBD_SUPPORT_WINUSB==1)

USBD_StdDevReq函数中,case USB_REQ_CLEAR_FEATURE:分支后面添加

#if (USBD_SUPPORT_WINUSB==1)
  case USB_REQ_MS_VENDOR_CODE:
    USBD_WinUSBGetDescriptor( pdev, req ); 
    break;
#endif // (USBD_SUPPORT_WINUSB==1)

USBD_StdItfReq函数中,switch的default分支中添加

#if (USBD_SUPPORT_WINUSB==1)
    if ( req->bmRequest == 0xC1 ) {
       USBD_WinUSBGetDescriptor( pdev, req ); 
       break;
    }
#endif // (USBD_SUPPORT_WINUSB==1)

USBD_GetDescriptor函数中,第一个switch的case USB_DESC_TYPE_STRING:分支中的USBD_IDX_INTERFACE_STR子分支后添加

#if (USBD_SUPPORT_WINUSB==1)
    case 0xEE: // OS String 
      pbuf = (uint8_t *) pdev->pClass->GetWinUSBOSDescriptor(&len);
      break;
#endif // (USBD_SUPPORT_WINUSB==1)

在该文件最后添加

#if (USBD_SUPPORT_WINUSB==1)
static void USBD_WinUSBGetDescriptor(USBD_HandleTypeDef *pdev, USBD_SetupReqTypedef *req)
{
  uint16_t len;
  uint8_t *pbuf;
  
  switch (req->wIndex)
  { 
  case 0x04: // compat ID
    pbuf = 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);
  }
  
   
}   

#endif // (USBD_SUPPORT_WINUSB==1)

Middlewares/ST/STM32_USB_Device_Library/Core/Inc/usbd_def.h

#define USB_REQ_SYNCH_FRAME后添加

// WinUSB MS Vendor Code
#define  USB_REQ_MS_VENDOR_CODE                         0xA0

typedef struct _Device_cb USBD_ClassTypeDef中,末尾添加

#if (USBD_SUPPORT_WINUSB == 1) 
  uint8_t  *(*GetWinUSBOSDescriptor)(uint16_t *length); 
#endif

typedef struct USBD_DescriptorsTypeDef中,末尾添加

#if (USBD_SUPPORT_WINUSB==1)

   uint8_t *(*GetWinUSBOSFeatureDescriptor)(uint16_t *length);
   uint8_t *(*GetWinUSBOSPropertyDescriptor)(uint16_t *length);
#endif

Middlewares/ST/STM32_USB_Device_Library/CDC/inc/usbd_cdc.c

static uint8_t USBD_CDC_DataIn (USBD_HandleTypeDef *pdev, uint8_t epnum);后添加

#if (USBD_SUPPORT_WINUSB==1)
uint8_t* USBD_WinUSBOSStrDescriptor(uint16_t *length);
#endif //(USBD_SUPPORT_WINUSB==1)

USBD_ClassTypeDef USBD_CDC中,末尾添加

#if (USBD_SUPPORT_WINUSB==1)   
  USBD_WinUSBOSStrDescriptor
#endif // (USBD_SUPPORT_WINUSB==1)

本文参考自:https://0w0.pw/417.html

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