WinUsb的同步传输收发

这里以USB Gddget- source/sink创建的设备为例，详见：https://www.usbzh.com/article/detail-1581.html

这里的同步端点位于inter=0,alt=1接口描述符下，有端点地址分别为0x02和0x82,PacektSize都为1024

接收例程为：

#define numPackets 10
void CWinUsbToolDlg::TestISORead()
{
    INT index = GetDlgItemInt(IDC_EDIT_ALT_INTERFACE);
    WINUSB_PIPE_INFORMATION info[4];
    for (int i = 0; i < 4; i++)
    {
        BOOL isok = WinUsb_QueryPipe(m_dev.m_WinusbHandle, index, i, &info[i]);
    }
    BOOL isok1 = m_dev.SetAlternate(index);

    UCHAR buff[1024* numPackets];
    WINUSB_ISOCH_BUFFER_HANDLE hIsochBuffer = NULL;
    BOOL bResult = WinUsb_RegisterIsochBuffer(m_dev.m_WinusbHandle, 0x82, buff, sizeof(buff), &hIsochBuffer);

    USBD_ISO_PACKET_DESCRIPTOR  IsoPacketDesc[numPackets];
    for (int i = 0; m_IsRcv; i++)
    {
        OVERLAPPED overlap;
        memset(&overlap, 0, sizeof(overlap));
        overlap.hEvent = m_dev.m_hEvent;
        ResetEvent(m_dev.m_hEvent);

        bResult = WinUsb_ReadIsochPipeAsap(hIsochBuffer, 0, sizeof(buff), FALSE, numPackets, IsoPacketDesc, &overlap);
        if (!bResult && GetLastError() != ERROR_IO_PENDING) 
        {
            printf("WinUsb_ReadIsochPipe failed immediately. Error: %d\n", GetLastError());
            break;
        }

        // 7. 等待异步操作完成（如果需要同步等待）
        DWORD dwBytesTransferred = 0;
        bResult = GetOverlappedResult(m_dev.m_WinusbHandle, &overlap, &dwBytesTransferred, TRUE);
        if (!bResult)
        {
            DWORD e = GetLastError();
            printf("GetOverlappedResult failed. Error: %d\n", GetLastError());
            break;
        }
    }

    if (hIsochBuffer != NULL)
    {
        WinUsb_UnregisterIsochBuffer(hIsochBuffer);
    }
}

发送例程：

void CWinUsbToolDlg::TestISOWrite()
{
    INT index = GetDlgItemInt(IDC_EDIT_ALT_INTERFACE);
    WINUSB_PIPE_INFORMATION info[4];
    for (int i = 0; i < 4; i++)
    {
        BOOL isok = WinUsb_QueryPipe(m_dev.m_WinusbHandle, index, i, &info[i]);
    }
    BOOL isok1 = m_dev.SetAlternate(index);

    UCHAR buff[1024 * numPackets];
    WINUSB_ISOCH_BUFFER_HANDLE hIsochBuffer = NULL;
    BOOL bResult = WinUsb_RegisterIsochBuffer(m_dev.m_WinusbHandle, 0x02, buff, sizeof(buff), &hIsochBuffer);

    for (int i = 0; m_IsRcv; i++)
    {
        OVERLAPPED overlap;
        memset(&overlap, 0, sizeof(overlap));
        overlap.hEvent = m_dev.m_hEvent;
        ResetEvent(m_dev.m_hEvent);
        memset(buff,i, 1024 * numPackets);

        bResult = WinUsb_WriteIsochPipeAsap(hIsochBuffer, 0, sizeof(buff), FALSE, &overlap);
        if (!bResult && GetLastError() != ERROR_IO_PENDING)
        {
            printf("WinUsb_ReadIsochPipe failed immediately. Error: %d\n", GetLastError());
            break;
        }

        // 7. 等待异步操作完成（如果需要同步等待）
        DWORD dwBytesTransferred = 0;
        bResult = GetOverlappedResult(m_dev.m_WinusbHandle, &overlap, &dwBytesTransferred, TRUE);
        if (!bResult)
        {
            DWORD e = GetLastError();
            printf("GetOverlappedResult failed. Error: %d\n", GetLastError());
            break;
        }
    }
}