voltagemeterdlg.cpp

AVR--USB--PC_USB电压表(mega8实现)

// VoltageMeterDlg.cpp : implementation file
//

#include "stdafx.h"
#include "VoltageMeter.h"
#include "VoltageMeterDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

#include "usb.h"

#define USBDEV_SHARED_VENDOR    0x16C0  /* VOTI */
#define USBDEV_SHARED_PRODUCT   0x05DC  /* Obdev's free shared PID */

static int  usbGetStringAscii(usb_dev_handle *dev, int index, int langid, char *buf, int buflen)
{
char    buffer[256];
int     rval, i;

    if((rval = usb_control_msg(dev, USB_ENDPOINT_IN, USB_REQ_GET_DESCRIPTOR, (USB_DT_STRING << 8) + index, langid, buffer, sizeof(buffer), 1000)) < 0)
        return rval;
    if(buffer[1] != USB_DT_STRING)
        return 0;
    if((unsigned char)buffer[0] < rval)
        rval = (unsigned char)buffer[0];
    rval /= 2;
    /* lossy conversion to ISO Latin1 */
    for(i=1;i<rval;i++)
	{
        if(i > buflen)				/* destination buffer overflow */
            break;
        buf[i-1] = buffer[2 * i];
        if(buffer[2 * i + 1] != 0)  /* outside of ISO Latin1 range */
            buf[i-1] = '?';
    }
    buf[i-1] = 0;
    return i-1;
}


#define PSCMD_ECHO  0
#define PSCMD_GET   1
#define PSCMD_ON    2
#define PSCMD_OFF   3
/* These are the vendor specific SETUP commands implemented by our USB device */


/* PowerSwitch uses the free shared default VID/PID. If you want to see an
 * example device lookup where an individually reserved PID is used, see our
 * RemoteSensor reference implementation.
 */

#define USB_ERROR_NOTFOUND  1
#define USB_ERROR_ACCESS    2
#define USB_ERROR_IO        3

static int usbOpenDevice(usb_dev_handle **device, int vendor, char *vendorName, int product, char *productName)
{
struct usb_bus      *bus;
struct usb_device   *dev;
usb_dev_handle      *handle = NULL;
int                 errorCode = USB_ERROR_NOTFOUND;
static int          didUsbInit = 0;

//Cstring msg;

    if(!didUsbInit)
	{
        didUsbInit = 1;
        usb_init();
    }
    usb_find_busses();
    usb_find_devices();
    for(bus=usb_get_busses(); bus; bus=bus->next)
	{
        for(dev=bus->devices; dev; dev=dev->next)
		{
            if(dev->descriptor.idVendor == vendor && dev->descriptor.idProduct == product)
			{
                char    string[256];
                int     len;
                handle = usb_open(dev); /* we need to open the device in order to query strings */
                if(!handle)
				{
                    errorCode = USB_ERROR_ACCESS;
                    //fprintf(stderr, "Warning: cannot open USB device: %s\n", usb_strerror());
                    //AfxMessageBox("Could not open USB device");
					continue;
                }
                if(vendorName == NULL && productName == NULL) /* name does not matter */
				{ 
                    break;
                }
                /* now check whether the names match: */
                len = usbGetStringAscii(handle, dev->descriptor.iManufacturer, 0x0409, string, sizeof(string));
                if(len < 0)
				{
                    errorCode = USB_ERROR_IO;
                    //fprintf(stderr, "Warning: cannot query manufacturer for device: %s\n", usb_strerror());
					//AfxMessageBox("Could not read USB device manufacturer ");
				}
				else
				{
                    errorCode = USB_ERROR_NOTFOUND;
                    /* fprintf(stderr, "seen device from vendor ->%s<-\n", string); */
                    if(strcmp(string, vendorName) == 0)
					{
                        len = usbGetStringAscii(handle, dev->descriptor.iProduct, 0x0409, string, sizeof(string));
                        if(len < 0)
						{
                            errorCode = USB_ERROR_IO;
                            //fprintf(stderr, "Warning: cannot query product for device: %s\n", usb_strerror());
								
						}
						else
						{
                            errorCode = USB_ERROR_NOTFOUND;
                            /* fprintf(stderr, "seen product ->%s<-\n", string); */
                            if(strcmp(string, productName) == 0)
                                break;
                        }
                    }
                }
                usb_close(handle);
                handle = NULL;
            }
        }
        if(handle)
            break;
    }
    if(handle != NULL)
	{
        errorCode = 0;
        *device = handle;
    }
    return errorCode;
}

usb_dev_handle      *handle = NULL;
unsigned char       buffer[8];			//USB data buffer

/////////////////////////////////////////////////////////////////////////////
// CVoltageMeterDlg dialog

CVoltageMeterDlg::CVoltageMeterDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CVoltageMeterDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CVoltageMeterDlg)
	m_check_1 = FALSE;
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CVoltageMeterDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CVoltageMeterDlg)
	DDX_Control(pDX, IDC_LCD, m_lcd);
	DDX_Check(pDX, IDC_CHECK1, m_check_1);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CVoltageMeterDlg, CDialog)
	//{{AFX_MSG_MAP(CVoltageMeterDlg)
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_CHECK1, OnCheck1)
	ON_WM_TIMER()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CVoltageMeterDlg message handlers

BOOL CVoltageMeterDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	// TODO: Add extra initialization here

	m_lcd.SetBkColor(RGB(120,130,255));
	m_lcd.SetColor(RGB( 110, 120, 240 ),RGB( 20, 20, 20 ));	
	m_lcd.SetText("--.--");

	SetTimer(1,1000,NULL);			// detect device

	return TRUE;  // return TRUE  unless you set the focus to a control
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CVoltageMeterDlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CVoltageMeterDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CVoltageMeterDlg::OnCheck1() 
{
	// TODO: Add your control notification handler code here
	UpdateData(true);
	
	if (m_check_1)
	{
		::SetWindowPos(this->m_hWnd,HWND_TOPMOST,0,0,0,0,SWP_NOMOVE|SWP_NOSIZE);  // top view
	}
	else
	{
		::SetWindowPos(this->m_hWnd,HWND_NOTOPMOST,0,0,0,0,SWP_NOMOVE|SWP_NOSIZE);  // normal view
	}
	
}

void CVoltageMeterDlg::readUSB()
{
	
	int nBytes = usb_control_msg(handle, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_IN, 
		PSCMD_GET, 0, 0, (char *)buffer, sizeof(buffer), 5000);
	if(nBytes < 2)
	{
		UsbErrMessage(nBytes);
		KillTimer(2);
		SetTimer(1,1000,NULL);			// detect device
	}
	else
	{
		CString a;
		
		int ad_data = (buffer[0] + buffer[1]*256);
		float fOut = (float)((2.56 * ad_data)*10)/1024;
		
		if (fOut < 10)
			a.Format(" %2.2f", fOut);
		else
			a.Format("%2.2f", fOut);

		m_lcd.SetText(a);
	}

}

void CVoltageMeterDlg::UsbErrMessage(int e)
{
	if (handle)
		usb_close(handle);

	m_lcd.SetText("--.--");
}

void CVoltageMeterDlg::OnTimer(UINT nIDEvent) 
{
	// TODO: Add your message handler code here and/or call default

	if (nIDEvent == 1)
	{
		if(usbOpenDevice(&handle, USBDEV_SHARED_VENDOR, "www.icbean.com", USBDEV_SHARED_PRODUCT, "VoltageMeter") != 0)
		{
			//UsbErrMessage(0);
		}
		else
		{
			KillTimer(1);
			SetTimer(2,100,NULL);			
			readUSB();
		}
	}
	else
	{
		readUSB();
	}

	CDialog::OnTimer(nIDEvent);
}