USB-HID

开源库

• libusb

基础使用

BOOL CMyUsbHid::Init()
{
  if (libusb_init(NULL) < 0) {
    printf("SDK初始化失败");
    return FALSE;
  }
  m_devHandle = libusb_open_device_with_vid_pid(NULL, m_vid, m_pid);
  if (m_devHandle == NULL) {
    printf("设备连接失败");
    libusb_exit(NULL);
    return FALSE;
  }
  return TRUE;
}
void CMyUsbHid::Release()
{
  if (m_devHandle)
  {
    libusb_close(m_devHandle);
    libusb_exit(NULL);
    m_devHandle = NULL;
  }
}
unsigned char* CMyUsbHid::Read(int &len)
{
  ZeroMemory(m_szData, sizeof(m_szData));
  uint8_t request_type = 0xA1;  // 161
  uint8_t bRequest = 0x01;
  uint16_t wValue = 0x0100;     // 256
  uint16_t wIndex = 0x0000;

  while (true)
  {
    len = libusb_control_transfer(m_devHandle, request_type, bRequest, wValue, wIndex, m_szData, 64, 500);

    if (len < 0) {
      Log(TEXT("单片机读失败"));
      return NULL;
    }
    if (len > 0)
      break;
    Sleep(100);
  }
  return m_szData;
}
BOOL CMyUsbHid::Write(unsigned char *szData, int &len)
{
  uint8_t request_type = 0x21;  // 33
  uint8_t bRequest = 0x09;
  uint16_t wValue = 0x0200;     // 512
  uint16_t wIndex = 0x0000;

  while(len > 0)
  {
    // 这里接口有问题，只能是64，使用len会写失败
    int re = libusb_control_transfer(m_devHandle, request_type, bRequest, wValue, wIndex, szData, 64, 3000);
    if (re < 0)
    {
      Log(TEXT("单片机写失败"));
      return FALSE;
    }

    len -= 64;
    szData += 64;
  }
  return TRUE;
}

Windows HID API 备记

1.获取设备信息，在建立连接时
HidD_GetAttributes
HidD_GetHidGuid
HidD_GetIndexedString
HidD_GetManufacturerString
HidD_GetPhysicalDescriptor
HidD_GetPreparsedData
HidD_GetProductString
HidD_GetSerialNumberString

2.设置输入缓冲大小
HidD_GetNumInputBuffers
HidD_SetNumInputBuffers

3.读数据
HidD_GetInputReport
ReadFile

4.写数据
HidD_SetOutputReport
ReadFile
HidD_SetFeature

5.HID语法信息
HidP_GetButtonCaps
HidP_GetButtons
HidP_GetButtonsEx
HidP_GetCaps
HidP_GetData
HidP_GetExtendedAttributes
HidP_GetLinkCollectionNodes
HidP_GetScaledUsageValue
HidP_GetSpecificButtonCaps
HidP_GetSpecificValueCaps
HidP_GetUsages
HidP_GetUsagesEx
HidP_GetUsageValue
HidP_GetUsageValueArray
HidP_GetValueCaps
HidP_InitializeReportForID
HidP_IsSameUsageAndPage
HidP_MaxDataListLength
HidP_MaxUsageListLength
HidP_SetButtons
HidP_SetData
HidP_SetScaledUsageValue
HidP_SetUsages
HidP_SetUsageValue
HidP_SetUsageValueArray
HidP_UnsetButtons
HidP_UnsetUsages
HidP_UsageAndPageListDifference
HidP_UsageListDifference

6.注意事项
读写数据的时候，数据大小必须是HidP_GetCaps获得的HIDP_CAPS的 InputReportByteLength/OutputReportByteLength