Hi guys, i'm doing a img processing project.
i need "read" data from USB device.
My colleage gave me a "precode" USB device that will generate 512bytes data about per 40 microsecond.
so i wrote some data to keep reading it.
here is the code, i hope it easy to read.
int main()
{
CCyUSBDevice *USBDevice = new CCyUSBDevice(NULL);
CCyBulkEndPoint *bulkIn = NULL;
bulkIn = (CCyBulkEndPoint *)USBDevice->EndPoints[3];
bulkIn->TimeOut=500; //rewrite it for saving time
LONG len =512;
unsigned char data2[512]={0};
int flag = 0;
while(true)
{
while(!flag)
{
flag = bulkIn->XferData(data2,len);
if(!flag)
{
flag = bulkIn->XferData(data2,len);
std::cout<<"failed ";
}
else
{
flag = false;
}
}
}
return 0;
}
basically the code using a flag to determinate run xferdata() again or nor.
the problem i met is, when xferdata() return false to var flag.
system will call xferdata() agian. since then, my system will keep return false.
i have tried delete the CCyUSBDevice intances and create a new one to connect the same endpoint again.
code:
if(!flag)
{
delete USBDevice;
USBDevice = NULL;
CCyUSBDevice *USBDevice = new CCyUSBDevice(NULL);
CCyBulkEndPoint *bulkIn = NULL;
bulkIn = (CCyBulkEndPoint *)USBDevice->EndPoints[3];
flag = bulkIn->XferData(data2,len);
std::cout<<"failed ";
}
seems like new intances still unable to read data from the same endpoint.
ps:lasterror is 997
anyone know how to deal with the "return false" situation?
Thanks!
