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Add new USB_Host_GetDeviceStringDescriptor() convenience function.

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This commit is contained in:
Dean Camera 2009-12-06 13:37:30 +00:00
parent c49bdcb7c9
commit c1fa230618
3 changed files with 33 additions and 0 deletions
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16
LUFA/Drivers/USB/LowLevel/Host.c
View file

@ -308,6 +308,22 @@ uint8_t USB_Host_GetDeviceDescriptor(void* const DeviceDescriptorPtr)
return USB_Host_SendControlRequest(DeviceDescriptorPtr);
}
uint8_t USB_Host_GetDeviceStringDescriptor(uint8_t Index, void* const Buffer, uint8_t BufferLength)
{
USB_ControlRequest = (USB_Request_Header_t)
{
bmRequestType: (REQDIR_DEVICETOHOST | REQTYPE_STANDARD | REQREC_DEVICE),
bRequest: REQ_GetDescriptor,
wValue: (DTYPE_String << 8) | Index,
wIndex: 0,
wLength: BufferLength,
};
Pipe_SelectPipe(PIPE_CONTROLPIPE);
return USB_Host_SendControlRequest(Buffer);
}
uint8_t USB_Host_ClearPipeStall(uint8_t EndpointNum)
{
if (Pipe_GetPipeToken() == PIPE_TOKEN_IN)

16
LUFA/Drivers/USB/LowLevel/Host.h
View file

@ -201,6 +201,22 @@
*/
uint8_t USB_Host_GetDeviceDescriptor(void* const DeviceDescriptorPtr);
/** Convenience function. This routine sends a GetDescriptor standard request to the attached
* device, requesting the string descriptor of the specified index. This can be used to easily
* retrieve string descriptors from the device by index, after the index is obtained from the
* Device or Configuration descriptors.
*
* \note After this routine returns, the control pipe will be selected.
*
* \param[in] Index Index of the string index to retrieve
* \param[out] Buffer Pointer to the destination buffer where the retrieved string decriptor is
* to be stored
* \param[in] BufferLength Maximum size of the string descriptor which can be stored into the buffer
*
* \return A value from the \ref USB_Host_SendControlErrorCodes_t enum to indicate the result.
*/
uint8_t USB_Host_GetDeviceStringDescriptor(uint8_t Index, void* const Buffer, uint8_t BufferLength);
/** Clears a stall condition on the given pipe, via a ClearFeature request to the attached device.
*
* \note After this routine returns, the control pipe will be selected.

1
LUFA/ManPages/ChangeLog.txt
View file

@ -22,6 +22,7 @@
* - Added new HID_ALIGN_DATA() macro to return the pre-retrieved value of a HID report item, left-aligned to a given datatype
* - Added new PreviousValue to the HID Report Parser report item structure, for easy monitoring of previous report item values
* - Added new EVK527 board target
* - Added new USB_Host_GetDeviceStringDescriptor() convenience function
*
* <b>Changed:</b>
* - Removed code in the Keyboard demos to send zeroed reports between two reports with differing numbers of keycodes