Content originally posted in LPCWare by micronpn on Wed Jul 16 04:08:54 MST 2014
I need to detect what type of device is connected to the USB Host port initially on a LPC1769 so that I could switch to call the right event functions related to the right devices.
Actually I put "in the middle" genric EVENT callback functions that inside should be able to detect the right device.
The first trial was done with a USB memory key and a Virtual Com device with this simple code:
void EVENT_USB_Host_DeviceEnumerationComplete(const uint8_t corenum)
{
uint16_t ConfigDescriptorSize;
uint8_t ConfigDescriptorData[512], bRet;
if((bRet = USB_Host_GetDeviceConfigDescriptor(corenum, 1, &ConfigDescriptorSize, ConfigDescriptorData, sizeof(ConfigDescriptorData))) != HOST_GETCONFIG_Successful)
{
DEBUGOUT("Error Retrieving Configuration Descriptor.\r\n");
return;
}
int iRet = USB_MS_Enumerated(corenum, &ConfigDescriptorSize, ConfigDescriptorData);
if(iRet == -1)
{
int iRet = USB_CDC_Enumerated(corenum, &ConfigDescriptorSize, ConfigDescriptorData);
if(iRet == -1)
{
DEBUGOUT("Unsupported or unknown attached device!!!\r\n");
return;
}
}
}
but in practice if I don't put the USB memory key in the USB host connector the code loops for ever in USB_MS_Enumerated(..) without exiting so that the next instructions are not executed at all.
I suppose that there is a function that should be able to return the type of the device connected to the USB host port. Am I wrong?
Kind regards,
Massimo
