/// <summary>
/// Gets the device string descriptor from the specified device.
/// </summary>
/// <param name="device">The device info of the device to get the descriptor from.</param>
/// <returns>True if USB transfer completed successfully. Otherwise, false.</returns>
public static StringInfo GetDeviceStringDescriptor(USBDeviceInfo device)
{
#if USB_TRACE
DBGMSG("USB: GET_DESCRIPTOR string");
#endif
StringInfo result = null;
StringDescriptor* descriptor = (StringDescriptor*)FOS_System.Heap.AllocZeroed((uint)sizeof(StringDescriptor), "USBManager : GetDeviceStringDescriptor");
try
{
ushort size = (ushort)sizeof(StringDescriptor);
USBTransfer transfer = new USBTransfer();
device.hc.SetupTransfer(device, transfer, USBTransferType.Control, 0, 64);
device.hc.SETUPTransaction(transfer, 8, 0x80, 6, 3, 0, 0, size);
device.hc.INTransaction(transfer, false, descriptor, size);
device.hc.OUTTransaction(transfer, true, null, 0);
device.hc.IssueTransfer(transfer);
if (transfer.success)
{
if (descriptor->length > 0)
{
int totalLangs = 0;
for (int i = 0; i < 10; i++)
{
if (descriptor->languageID[i] >= 0x0400 && descriptor->languageID[i] <= 0x0465)
{
totalLangs++;
}
}
result = new StringInfo()
{
LanguageIds = new ushort[totalLangs]
};
totalLangs = 0;
for (int i = 0; i < 10; i++)
{
if (descriptor->languageID[i] >= 0x0400 && descriptor->languageID[i] <= 0x0465)
{
result.LanguageIds[totalLangs++] = descriptor->languageID[i];
}
}
}
else
{
result = new StringInfo()
{
LanguageIds = new ushort[0]
};
}
#if USB_TRACE
ShowString(result);
#endif
}
}
finally
{
FOS_System.Heap.Free(descriptor);
}
return result;
}
private static void ShowString(StringInfo info)
{
DBGMSG("Languages: ");
for (byte i = 0; i < info.LanguageIds.Length; i++)
{
DBGMSG(StringInfo.GetLanguageName(info.LanguageIds[i]));
}
}