usbcdc可以双向通信吗

发布网友发布时间：2023-01-22 13:21

共2个回答

热心网友时间：2024-02-16 19:10

以下就是要改动的地方

1.将usbd_hid_core.c和usbd_hid_cdc_wrapper.c和他们的头文件加入进去，这两个文件可以在例程自带的USB库中找到

2.将__ALIGN_BEGIN uint8_t USBD_DeviceDesc[USB_SIZ_DEVICE_DESC]改为如下，这一步主要是修改设备描述符为复合设备

__ALIGN_BEGIN uint8_t USBD_DeviceDesc[USB_SIZ_DEVICE_DESC] __ALIGN_END =
{
0x12, /*bLength */
USB_DEVICE_DESCRIPTOR_TYPE, /*bDescriptorType*/
0x00, /*bcdUSB */
0x02,
0xEF, /*bDeviceClass*/
0x02, /*bDeviceSubClass*/
0x01, /*bDeviceProtocol*/
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 proct string*/
USBD_IDX_SERIAL_STR, /*Index of serial number string*/
USBD_CFG_MAX_NUM /*bNumConfigurations*/
} ; /* USB_DeviceDescriptor */
3.更改PID VID

#define USBD_VID 0x0483
#define USBD_PID 0xA105
3.在usbd_hid_core.c和.h中修改以下地方，主要是添加HID 输入端口和报文，例程的库中USBD_HID_CfgDesc是只有USB HID输入端口（HID_IN_EP）没有输出端口（HID_OUT_EP）的，同样例程中的HID_MOUSE_ReportDesc报文是让电脑按鼠标的方式来处理USB数据的，现在改为传输64字节数据报文，然后就可以通过USB自定义协议来进行数据传输了。当然USB_HID_CONFIG_DESC_SIZ和HID_MOUSE_REPORT_DESC_SIZE两个数据长度也要修改

#define USB_HID_CONFIG_DESC_SIZ 41
#define USB_HID_DESC_SIZ 9
#define HID_MOUSE_REPORT_DESC_SIZE 33

__ALIGN_BEGIN static uint8_t USBD_HID_CfgDesc[USB_HID_CONFIG_DESC_SIZ] __ALIGN_END =
{
0x09, /* bLength: Configuration Descriptor size */
USB_CONFIGURATION_DESCRIPTOR_TYPE, /* bDescriptorType: Configuration */
USB_HID_CONFIG_DESC_SIZ,
/* wTotalLength: Bytes returned */
0x00,
0x01, /*bNumInterfaces: 1 interface*/
0x01, /*bConfigurationValue: Configuration value*/
0x00, /*iConfiguration: Index of string descriptor describing
the configuration*/
0xE0, /*bmAttributes: bus powered and Support Remote Wake-up */
0x32, /*MaxPower 100 mA: this current is used for detecting Vbus*/

/************** Descriptor of Joystick Mouse interface ****************/
/* 09 */
0x09, /*bLength: Interface Descriptor size*/
USB_INTERFACE_DESCRIPTOR_TYPE,/*bDescriptorType: Interface descriptor type*/
0x00, /*bInterfaceNumber: Number of Interface*/
0x00, /*bAlternateSetting: Alternate setting*/
0x02, /*bNumEndpoints*/
0x03, /*bInterfaceClass: HID*/
0x01, /*bInterfaceSubClass : 1=BOOT, 0=no boot*/
0x02, /*nInterfaceProtocol : 0=none, 1=keyboard, 2=mouse*/
0, /*iInterface: Index of string descriptor*/
/******************** Descriptor of Joystick Mouse HID ********************/
/* 18 */
0x09, /*bLength: HID Descriptor size*/
HID_DESCRIPTOR_TYPE, /*bDescriptorType: HID*/
0x11, /*bcdHID: HID Class Spec release number*/
0x01,
0x00, /*bCountryCode: Hardware target country*/
0x01, /*bNumDescriptors: Number of HID class descriptors to follow*/
0x22, /*bDescriptorType*/
HID_MOUSE_REPORT_DESC_SIZE,/*wItemLength: Total length of Report descriptor*/
0x00,
/******************** Descriptor of Mouse endpoint ********************/
/* 27 */
0x07, /*bLength: Endpoint Descriptor size*/
USB_ENDPOINT_DESCRIPTOR_TYPE, /*bDescriptorType:*/

HID_IN_EP, /*bEndpointAddress: Endpoint Address (IN)*/
0x03, /*bmAttributes: Interrupt endpoint*/
HID_IN_PACKET, /*wMaxPacketSize: 4 Byte max */
0x00,
HID_FS_BINTERVAL, /*bInterval: Polling Interval (10 ms)*/
/* 34 */
0x07, /*bLength: Endpoint Descriptor size*/
USB_ENDPOINT_DESCRIPTOR_TYPE, /*bDescriptorType:*/

HID_OUT_EP, /*bEndpointAddress: Endpoint Address (IN)*/
0x03, /*bmAttributes: Interrupt endpoint*/
HID_OUT_PACKET, /*wMaxPacketSize: 4 Byte max */
0x00,
HID_FS_BINTERVAL, /*bInterval: Polling Interval (10 ms)*/
/* 41 */
} ;

__ALIGN_BEGIN static uint8_t HID_MOUSE_ReportDesc[HID_MOUSE_REPORT_DESC_SIZE] __ALIGN_END =
{
0x05, 0x8c, /* USAGE_PAGE (ST Page) */
0x09, 0x01, /* USAGE (Demo Kit) */
0xa1, 0x01, /* COLLECTION (Application) */

0x09,0x03, // USAGE ID - Vendor defined
0x15,0x00, // LOGICAL_MINIMUM (0)
0x26,0x00, 0xFF, // LOGICAL_MAXIMUM (255)
0x75,0x08, // REPORT_SIZE (8bit)
0x95,0x40, // REPORT_COUNT (64Byte)
0x81,0x02, // INPUT (Data,Var,Abs)
0x09,0x04, // USAGE ID - Vendor defined
0x15,0x00, // LOGICAL_MINIMUM (0)
0x26,0x00,0xFF, // LOGICAL_MAXIMUM (255)
0x75,0x08, // REPORT_SIZE (8bit)
0x95,0x40, // REPORT_COUNT (64Byte)
0x91,0x02, // OUTPUT (Data,Var,Abs)

0xc0 /* END_COLLECTION */
#endif
};
4.将对应的USB HID 输入端口初始化添加上去

uint8_t USBD_HID_Init (void *pdev,
uint8_t cfgidx)
{

/* Open EP IN */
DCD_EP_Open(pdev,
HID_IN_EP,
HID_IN_PACKET,
USB_OTG_EP_INT);
DCD_EP_Open(pdev,
HID_OUT_EP,
HID_OUT_PACKET,
USB_OTG_EP_INT);
#if 1
/* Prepare Out endpoint to receive next packet */
DCD_EP_PrepareRx(pdev,
HID_OUT_EP,
(uint8_t*)(USB_HID_Rx_Buffer),
HID_OUT_PACKET);
#endif
return USBD_OK;
}

/**
* @brief USBD_HID_Init
* DeInitialize the HID layer
* @param pdev: device instance
* @param cfgidx: Configuration index
* @retval status
*/
uint8_t USBD_HID_DeInit (void *pdev,
uint8_t cfgidx)
{
/* Close HID EPs */
DCD_EP_Close (pdev , HID_IN_EP);
DCD_EP_Close (pdev , HID_OUT_EP);
return USBD_OK;
}
5.在usbd_hid_cdc_wrapper.c的USBD_HID_CDC_CfgDesc中，同样的添加USB输入端口，而IAD和配置接口那些人家已经帮你添加好了，照着用就行

__ALIGN_BEGIN static uint8_t USBD_HID_CDC_CfgDesc[USB_HID_CDC_CONFIG_DESC_SIZ] __ALIGN_END =
{
0x09, /* bLength: Configuration Descriptor size */
USB_CONFIGURATION_DESCRIPTOR_TYPE, /* bDescriptorType: Configuration */
USB_HID_CDC_CONFIG_DESC_SIZ,
/* wTotalLength: Bytes returned */
0x00,
0x03, /*bNumInterfaces: 3 interfaces (2 for CDC, 1 for MSC)*/
0x01, /*bConfigurationValue: Configuration value*/
0x00, /*iConfiguration: Index of string descriptor describing
the configuration*/
0xE0, /*bmAttributes: bus powered and Support Remote Wake-up */
0x32, /*MaxPower 100 mA: this current is used for detecting Vbus*/

/************** Descriptor of Joystick Mouse interface ****************/
/* 09 */
0x09, /*bLength: Interface Descriptor size*/
USB_INTERFACE_DESCRIPTOR_TYPE,/*bDescriptorType: Interface descriptor type*/
HID_INTERFACE, /*bInterfaceNumber: Number of Interface*/
0x00, /*bAlternateSetting: Alternate setting*/
0x02, /*bNumEndpoints*/
0x03, /*bInterfaceClass: HID*/
0x01, /*bInterfaceSubClass : 1=BOOT, 0=no boot*/
0x02, /*nInterfaceProtocol : 0=none, 1=keyboard, 2=mouse*/
0, /*iInterface: Index of string descriptor*/
/******************** Descriptor of Joystick Mouse HID ********************/
/* 18 */
0x09, /*bLength: HID Descriptor size*/
HID_DESCRIPTOR_TYPE, /*bDescriptorType: HID*/
0x11, /*bcdHID: HID Class Spec release number*/
0x01,
0x00, /*bCountryCode: Hardware target country*/
0x01, /*bNumDescriptors: Number of HID class descriptors to follow*/
0x22, /*bDescriptorType*/
HID_MOUSE_REPORT_DESC_SIZE,/*wItemLength: Total length of Report descriptor*/
0x00,
/******************** Descriptor of Mouse endpoint ********************/
/* 27 */
0x07, /*bLength: Endpoint Descriptor size*/
USB_ENDPOINT_DESCRIPTOR_TYPE, /*bDescriptorType:*/

HID_IN_EP, /*bEndpointAddress: Endpoint Address (IN)*/
0x03, /*bmAttributes: Interrupt endpoint*/
HID_IN_PACKET, /*wMaxPacketSize: 4 Byte max */
0x00,
0x0A, /*bInterval: Polling Interval (10 ms)*/
/* 34 */
0x07, /*bLength: Endpoint Descriptor size*/
USB_ENDPOINT_DESCRIPTOR_TYPE, /*bDescriptorType:*/

HID_OUT_EP, /*bEndpointAddress: Endpoint Address (IN)*/
0x03, /*bmAttributes: Interrupt endpoint*/
HID_OUT_PACKET, /*wMaxPacketSize: 4 Byte max */
0x00,
HID_FS_BINTERVAL, /*bInterval: Polling Interval (10 ms)*/
/* 41 */
/******** /IAD should be positioned just before the CDC interfaces ******
IAD to associate the two 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 */
USB_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType: Interface */
/* Interface descriptor type */
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 */
0x00, /* 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 */
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: */
0x02, /* 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 */

} ;
6.在usbd_conf.h文件中修改输入输出端口和大小

#defineHID_IN_EP0x81
#define HID_IN_PACKET0x40

#defineHID_OUT_EP0x01
#define HID_OUT_PACKET 0x40

#define CDC_IN_EP 0x83 /* EP1 for data IN */
#define CDC_OUT_EP 0x03 /* EP1 for data OUT */
#define CDC_CMD_EP 0x82 /* EP2 for CDC commands */
7.在usb_conf.h中修改缓冲区大小，这里不改端口3是发不出数据的

#ifdef USB_OTG_FS_CORE
#define RX_FIFO_FS_SIZE 64
#define TX0_FIFO_FS_SIZE 64
#define TX1_FIFO_FS_SIZE 64
#define TX2_FIFO_FS_SIZE 64
#define TX3_FIFO_FS_SIZE 64
7.在main中while循环中添加一下测试代码

uint8_t test_buf[64]={2,2,3,4,5,6,2,4,5};
while(1)
{
if(usbstatus!=bDeviceState)
{
usbstatus=bDeviceState;
if(usbstatus==1)
{
POINT_COLOR=BLUE;
//LCD_ShowString(30,130,200,16,16,"USB Connected ");
LED1=0;//DS1ÁÁ
}else
{
POINT_COLOR=RED;
//LCD_ShowString(30,130,200,16,16,"USB disConnected ");
LED1=1;//DS1Ãð
}
}
if(USB_USART_RX_STA&0x8000)
{
VCP_DataRx(USB_USART_RX_BUF,64);
len=USB_USART_RX_STA&0x3FFF;

//USBD_HID_SendReport(&USB_OTG_dev,test_buf,64);
for(t=0;t<len;t++)
{
VCP_DataTx(USB_USART_RX_BUF[t]);
}
usb_printf("\r\n\r\n");
USB_USART_RX_STA=0;
}else
{
times++;
if(times%5000==0)
{

}
if(times%200==0)
{
delay_ms(20);
USBD_HID_SendReport(&USB_OTG_dev,test_buf,64);
delay_ms(20);
}
if(times%30==0)LED0=!LED0;
delay_ms(10);
}
这样就改好了，编译下载下去就可以在电脑端看到你的CDC和HID设备了

这是USB抓包和串口测试

代码可自行下载

https://download.csdn.net/download/C_linux_233/85165930

热心网友时间：2024-02-16 19:10

可以。
USB的CDC类是USB通信设备类的简称。
CDC类是USB组织定义的一类专门给各种通信设备（电信通信设备和中速网络通信设备）使用的USB子类。
根据CDC类所针对通信设备的不同，CDC类又被分成以下不同的模型：USB传统纯电话业务（POTS）模型，USB ISDN模型和USB网络模型。
其中，USB传统纯电话业务模型，有可分为直接线控制模型、抽象控制模型和USB电话模型。
虚拟串口就属于USB传统纯电话业务模型下的抽象控制模型。