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標題: PIC單片機的USB接口的應用 一個簡單的USB CDC 測試程序 [打印本頁]
作者: oldspring    時間: 2018-10-22 10:43
標題: PIC單片機的USB接口的應用 一個簡單的USB CDC 測試程序
本帖最后由 oldspring 于 2018-10-22 10:45 編輯

單片機的USB接口，通常用法，
1）HID  是Human Interface Device的縮寫，由其名稱可以了解HID設備是直接與人交互的設備，例如鍵盤、鼠標與游戲桿等。不過HID設備并不一定要有人機接口，只要符合HID類別規范的設備都是HID設備。（參考百度 https://baike.baidu.com/item/USB-HID）
2）CDC 虛擬串口，可與PC機直接聯機通訊，如同RS232。
3）USB MSC (Mass Storageclass) MSC是一種計算機和移動設備之間的傳輸協議，它允許一個通用串行總線（USB）設備來訪問主機的計算設備，使兩者之間進行文件傳輸。設備包括：移動硬盤，移動光驅，U盤，SD、TF等儲存卡讀卡器，數碼相機，手機等等
..........

注意：
1）每一個USB設備，都需要一個獨立的身份編碼 （ID），它由 2 組數字組成，一個是開發商代碼（Vender ID），另一個是產品代碼（Product ID）。如果是PIC使用者，可以向Microchip公司申請獲得免費的身份編碼。
2）USB CDC 虛擬串口接口的用法與其他的 USB 接口有所不同，它在聯接PC 時，Windows 操作系統會提示安裝驅動文件（xxxx.inf)。這個文件的基本內容包含USB CDC 的身份編碼 （ID）和開發者的有關信息。

以下介紹一個簡單的CDC 測試程序范例，希望對大家有幫助。
  1. program CDCDevice_Custom

  3. ' Buffer of 64 bytes
  4. dim buffer as byte[64] absolute 0x500
  5. dim dataReceived as byte
  6. dim dataReceivedSize as word

  8. sub procedure USBDev_CDCParamsChanged()
  9. end sub

  11. ' USB interrupt service routine
  12. sub procedure interrupt()
  13.   ' Call library interrupt handler routine
  14.   USBDev_IntHandler()
  15. end sub

  17. ' Callback function which will be called on received packet
  18. sub procedure USBDev_CDCDataReceived(dim size as word)
  19.   dataReceived = 1
  20.   dataReceivedSize = size
  21. end sub


  24. main:
  25.   dataReceived = 0

  27.   ADCON1 = ADCON1 or 0x0F  ' Configure all ports with analog function as digital
  28.   CMCON  = CMCON  or 7     ' Disable comparators

  30.   ' Initialize HID Class
  31.   USBDev_CDCInit()

  33.   ' Initialize USB device module
  34.   USBDev_Init()

  36.   ' Enable USB device interrupt
  37.   IPEN_bit = 1
  38.   USBIP_bit = 1
  39.   USBIE_bit = 1
  40.   GIEH_bit = 1

  42.   ' Infinite loop
  43.   while(1)
  44.       ' If device is configured
  45.       if USB_CDC_DeviceConfigured then
  46.         ' Prepare receive buffer
  47.         USBDev_CDCSetReceiveBuffer(@buffer)
  48.         ' Reset configured flag
  49.         USB_CDC_DeviceConfigured = false
  50.       end if
  51.       
  52.       if(dataReceived = 1) then
  53.         dataReceived = 0
  54.         ' Send back received packet
  55.         USBDev_CDCSendData(@buffer, dataReceivedSize)
  56.         ' Prepare receive buffer
  57.         USBDev_CDCSetReceiveBuffer(@buffer)
  58.       end if

  60.   wend

  62. end.
復制代碼
  1. module CDC_Descriptor

  3. const _USB_CDC_INT_EP_IN as byte = 1    ' Communication interface IN endpoint
  4. const _USB_CDC_BULK_EP_IN as byte = 2   ' Data interface IN endpoint
  5. const _USB_CDC_BULK_EP_OUT as byte = 3  ' Data interface OUT endpoint

  7. const _USB_CDC_MANUFACTURER_STRING  as string[16] = "Mikroelektronika"
  8. const _USB_CDC_PRODUCT_STRING       as string[8] = "VCP Demo"
  9. const _USB_CDC_SERIALNUMBER_STRING  as string[10] = "0x00000004"
  10. const _USB_CDC_CONFIGURATION_STRING as string[22] = "CDC Config desc string"
  11. const _USB_CDC_INTERFACE_STRING     as string[25] = "CDC Interface desc string"

  13. const _USB_CDC_CONFIG_DESC_SIZ   as byte = 3*9 + 3*5 + 4 + 3*7

  15. 'String Descriptor Zero, Specifying Languages Supported by the Device
  16. const USB_CDC_LangIDDesc as byte[4] = (
  17.   0x04,
  18.   _USB_DEV_DESCRIPTOR_TYPE_STRING,
  19.   0x409 and 0xFF,
  20.   0x409 >> 8)

  22. ' device descriptor
  23. const USB_CDC_device_descriptor as byte[18] = (
  24.   0x12,       ' bLength
  25.   0x01,       ' bDescriptorType
  26.   0x00,       ' bcdUSB
  27.   0x02,
  28.   0x02,       ' bDeviceClass : CDC code
  29.   0x00,       ' bDeviceSubClass
  30.   0x00,       ' bDeviceProtocol
  31.   0x40,       ' bMaxPacketSize0
  32.   0x00, 0x00, ' idVendor
  33.   0x00, 0x04, ' idProduct
  34.   0x00,       ' bcdDevice
  35.   0x01,
  36.   0x01,       ' iManufacturer
  37.   0x02,       ' iProduct
  38.   0x03,       ' iSerialNumber
  39.   0x01        ' bNumConfigurations
  40.   )

  42. 'contain configuration descriptor, all interface descriptors, and endpoint
  43. 'descriptors for all of the interfaces
  44. const USB_CDC_cfg_descriptor as byte[_USB_CDC_CONFIG_DESC_SIZ] = (
  45.     ' Configuration Descriptor
  46.     0x09,   '  bLength: Configuration Descriptor size
  47.     0x02,   '  bDescriptorType: Configuration
  48.     _USB_CDC_CONFIG_DESC_SIZ,       '  wTotalLength: number of returned bytes
  49.     _USB_CDC_CONFIG_DESC_SIZ >> 8,
  50.     0x02,   '  bNumInterfaces: 2 interfaces
  51.     0x01,   '  bConfigurationValue: Configuration value
  52.     0x00,   '  iConfiguration: Index of string descriptor describing the configuration
  53.     0xC0,   '  bmAttributes: self powered
  54.     0x32,   '  bMaxPower: 100 mA

  56.     ' Interface Descriptor
  57.     0x09,   '  bLength: Interface Descriptor size
  58.     _USB_DEV_DESCRIPTOR_TYPE_INTERFACE,  '  bDescriptorType: Interface
  59.     0x00,   '  bInterfaceNumber: Number of Interface
  60.     0x00,   '  bAlternateSetting: Alternate setting
  61.     0x01,   '  bNumEndpoints: One endpoint used
  62.     0x02,   '  bInterfaceClass: Communication Interface Class
  63.     0x02,   '  bInterfaceSubClass: Abstract Control Model
  64.     0x01,   '  bInterfaceProtocol: AT commands
  65.     0x00,   '  iInterface: string descriptor index

  67.     ' Header Functional Descriptor
  68.     0x05,   '  bLength: Descriptor size
  69.     0x24,   '  bDescriptorType: CS_INTERFACE
  70.     0x00,   '  bDescriptorSubtype: Header Functional Descriptor
  71.     0x10,   '  bcdCDC: specification release number
  72.     0x01,

  74.     ' Call Management Functional Descriptor
  75.     0x05,   '  bFunctionLength: Descriptor size
  76.     0x24,   '  bDescriptorType: CS_INTERFACE
  77.     0x01,   '  bDescriptorSubtype: Call Management Functional descriptor
  78.     0x00,   '  bmCapabilities: Device does not handle call management itself
  79.     0x01,   '  bDataInterface: 1

  81.     ' Abstract Control Management Functional Descriptor
  82.     0x04,   '  bFunctionLength: Descriptor size
  83.     0x24,   '  bDescriptorType: CS_INTERFACE
  84.     0x02,   '  bDescriptorSubtype: Abstract Control Management descriptor
  85.     0x02,   '  bmCapabilities:  Device supports the request combination of
  86.             '  Set_Line_Coding, Set_Control_Line_State,
  87.             '  Get_Line_Coding, and the notification Serial_State

  89.     ' Union Functional Descriptor
  90.     0x05,   '  bFunctionLength: Descriptor size
  91.     0x24,   '  bDescriptorType: CS_INTERFACE
  92.     0x06,   '  bDescriptorSubtype: Union functional descriptor
  93.     0x00,   '  bMasterInterface: Communication class interface
  94.     0x01,   '  bSlaveInterface0: Data Class Interface

  96.     ' Interrupt IN Endpoint Descriptor
  97.     0x07,   '  bLength: Endpoint Descriptor size
  98.     _USB_DEV_DESCRIPTOR_TYPE_ENDPOINT,   '  bDescriptorType: Endpoint
  99.     0x80 or _USB_CDC_INT_EP_IN,          '  bEndpointAddress
  100.     0x03,   '  bmAttributes: Interrupt
  101.     0x08,   '  wMaxPacketSize
  102.     0x00,
  103.     0xFF,   '  bInterval

  105.     ' Data class interface descriptor
  106.     0x09,   '  bLength: Endpoint Descriptor size
  107.     _USB_DEV_DESCRIPTOR_TYPE_INTERFACE,  '  bDescriptorType:
  108.     0x01,   '  bInterfaceNumber: Number of Interface
  109.     0x00,   '  bAlternateSetting: Alternate setting
  110.     0x02,   '  bNumEndpoints: Two endpoints used
  111.     0x0A,   '  bInterfaceClass: CDC
  112.     0x00,   '  bInterfaceSubClass
  113.     0x00,   '  bInterfaceProtocol
  114.     0x00,   '  iInterface

  116.     ' Bulk OUT Endpoint Descriptor
  117.     0x07,   '  bLength: Endpoint Descriptor size
  118.     _USB_DEV_DESCRIPTOR_TYPE_ENDPOINT,   '  bDescriptorType: Endpoint
  119.     _USB_CDC_BULK_EP_OUT,                '  bEndpointAddress
  120.     0x02,   '  bmAttributes: Bulk
  121.     64,     '  wMaxPacketSize
  122.     0x00,
  123.     0x00,   '  bInterval: ignore for Bulk transfer

  125.     ' Bulk IN Endpoint Descriptor
  126.     0x07,   '  bLength: Endpoint Descriptor size
  127.     _USB_DEV_DESCRIPTOR_TYPE_ENDPOINT,   '  bDescriptorType: Endpoint
  128.     0x80 or _USB_CDC_BULK_EP_IN,         '  bEndpointAddress
  129.     0x02,   '  bmAttributes: Bulk
  130.     64,     '  wMaxPacketSize
  131.     0x00,
  132.     0x00    '  bInterval
  133. )
  134.   

  136. end.
復制代碼

以下是USB CDC的驅動文件內容，開發者可以根據需要進行相關信息的修改。
  1. Signature="$Windows NT[        DISCUZ_CODE_2        ]quot;
  2. Class=Ports
  3. ClassGuid={4D36E978-E325-11CE-BFC1-08002BE10318}
  4. Provider=%ProviderName%
  5. DriverVer=04/30/2013,1.0.0.0
  6. CatalogFile.ntx86=VCPDriverX86.cat
  7. CatalogFile.ntamd64=VCPDriverX64.cat

  9. [MANUFACTURER]
  10. %ProviderName%=DeviceList, NTx86, NTamd64

  12. [DeviceList.NTx86]
  13. %MikroeCDC%=DriverInstall,USB\VID_0000&PID_0400

  15. [DeviceList.NTamd64]
  16. %MikroeCDC%=DriverInstall,USB\VID_0000&PID_0400

  18. [DriverInstall]
  19. include=mdmcpq.inf
  20. CopyFiles=FakeModemCopyFileSection
  21. AddReg=LowerFilterAddReg,SerialPropPageAddReg

  23. [DriverInstall.Services]
  24. include = mdmcpq.inf
  25. AddService = usbser, 0x00000002, LowerFilter_Service_Inst

  27. [SerialPropPageAddReg]
  28. HKR,,EnumPropPages32,,"MsPorts.dll,SerialPortPropPageProvider"

  30. [Strings]
  31. ProviderName = "MikroElektronika"
  32. MikroeCDC = "Mikroe Virtual Com Port"
復制代碼

詳細內容，請參考：http://www.raoushi.com/bbs/dpj-138111-1.html




VCPDriver.zip

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