For coast down reason, i need put at least four CY7C68013A(EZ-USB-FX2) devices on one PC's USB ports, but i don't know how my application software to know which one is the correct one to control? or, if i open four instances of the application waftware, how can the four instances and the four devices can be one to one correspondence? thank you!

 Hi,

        Are you using cypress library for Host application development?  You can select devices based on VID/PID value.

    Please see http://www.cypress.com/?rID=12974, http://www.cypress.com/?rID=53165 and http://www.cypress.com/?rID=43538, these ANs would be helpful for you.

      Can you tell us more about your application so that we can help you out.

 Thanks

Prajith

Hi, i'm sorry for hand slip to click the "report abuse". YES, I used CYUSB.LIB to create a application in vc++ 6.0 platform, this .lib has a function bool CCyUSBDevice::Open(UCHAR dev) to open different CY7C68013A devices, but i don't know how to sent data to the one device that i want. If the XferData() can know whiche device it shout send to? or someone else function can do it? thanks!

the structure of my design is:

useing application to download firmwire into CY7C68013A's RAM everytime when i open it. 

useing Xferdata() to transfer data to CY7C68013A

when firmwire get the data, useing "switch" to decide which function should be called base on the data.

 Hi,

  Using below code identify your device number and then thransfer data.   

//  Look for a device having VID = 0547, PID = 1002

 CCyUSBDevice *USBDevice  = new  CCyUSBDevice(NULL);   //  Create an instance of CCyUSBDevice

int   devices = USBDevice->DeviceCount();

int   vID, pID;

int  d = 0;

do   {

 USBDevice->Open(d);   // Open automatically  calls Close() if necessary

 vID = USBDevice->VendorID;

 pID  = USBDevice->ProductID;

 d++;

}   while  ((d < devices ) && (vID != 0x0547) &&  (pID != 0x1002));

Thanks

Prajith