Add new USB_Host_SetInterfaceAltSetting() convenience function.

5 files changed, 65 insertions, 13 deletions

diff --git a/LUFA/Drivers/USB/Class/Host/Printer.c b/LUFA/Drivers/USB/Class/Host/Printer.c
index 278df2e3f..290393ac5 100644
--- a/LUFA/Drivers/USB/Class/Host/Printer.c
+++ b/LUFA/Drivers/USB/Class/Host/Printer.c
@@ -181,19 +181,11 @@ uint8_t PRNT_Host_SetBidirectionalMode(USB_ClassInfo_PRNT_Host_t* const PRNTInte
 	{
 		uint8_t ErrorCode;
 
-		USB_ControlRequest = (USB_Request_Header_t)
-			{
-				.bmRequestType = (REQDIR_HOSTTODEVICE | REQTYPE_STANDARD | REQREC_INTERFACE),
-				.bRequest      = REQ_SetInterface,
-				.wValue        = PRNTInterfaceInfo->State.AlternateSetting,
-				.wIndex        = PRNTInterfaceInfo->State.InterfaceNumber,
-				.wLength       = 0,
-			};
-
-		Pipe_SelectPipe(PIPE_CONTROLPIPE);
-
-		if ((ErrorCode = USB_Host_SendControlRequest(NULL)) != HOST_SENDCONTROL_Successful)
-		  return ErrorCode;
+		if ((ErrorCode = USB_Host_SetInterfaceAltSetting(PRNTInterfaceInfo->State.InterfaceNumber,
+		                                                 PRNTInterfaceInfo->State.AlternateSetting)) != HOST_SENDCONTROL_Successful)
+		{
+			return ErrorCode;
+		}
 	}
 
 	return HOST_SENDCONTROL_Successful;
diff --git a/LUFA/Drivers/USB/Core/AVR8/Host_AVR8.c b/LUFA/Drivers/USB/Core/AVR8/Host_AVR8.c
index 6c45265d7..d18e023c7 100644
--- a/LUFA/Drivers/USB/Core/AVR8/Host_AVR8.c
+++ b/LUFA/Drivers/USB/Core/AVR8/Host_AVR8.c
@@ -351,5 +351,22 @@ uint8_t USB_Host_ClearPipeStall(const uint8_t EndpointNum)
 	return USB_Host_SendControlRequest(NULL);
 }
 
+uint8_t USB_Host_SetInterfaceAltSetting(const uint8_t InterfaceNum,
+                                        const uint8_t AltSetting)
+{
+	USB_ControlRequest = (USB_Request_Header_t)
+		{
+			.bmRequestType = (REQDIR_HOSTTODEVICE | REQTYPE_STANDARD | REQREC_INTERFACE),
+			.bRequest      = REQ_SetInterface,
+			.wValue        = AltSetting,
+			.wIndex        = InterfaceNum,
+			.wLength       = 0,
+		};
+
+	Pipe_SelectPipe(PIPE_CONTROLPIPE);
+
+	return USB_Host_SendControlRequest(NULL);
+}
+
 #endif
 
diff --git a/LUFA/Drivers/USB/Core/AVR8/Host_AVR8.h b/LUFA/Drivers/USB/Core/AVR8/Host_AVR8.h
index 836c83b67..58d980442 100644
--- a/LUFA/Drivers/USB/Core/AVR8/Host_AVR8.h
+++ b/LUFA/Drivers/USB/Core/AVR8/Host_AVR8.h
@@ -330,6 +330,19 @@
 			 */
 			uint8_t USB_Host_ClearPipeStall(const uint8_t EndpointIndex);
 
+			/** Selects a given alternative setting for the specfied interface, via a SET INTERFACE standard request to
+			 *  the attached device.
+			 *
+			 *  \note After this routine returns, the control pipe will be selected.
+			 *
+			 *  \param[in] InterfaceIndex  Index of the interface whose alternative setting is to be altered.
+			 *  \param[in] AltSetting      Index of the interface's alternative setting which is to be selected.
+			 *
+			 *  \return A value from the \ref USB_Host_SendControlErrorCodes_t enum to indicate the result.
+			 */
+			uint8_t USB_Host_SetInterfaceAltSetting(const uint8_t InterfaceNum,
+													const uint8_t AltSetting);
+
 	/* Private Interface - For use in library only: */
 	#if !defined(__DOXYGEN__)
 		/* Macros: */
diff --git a/LUFA/Drivers/USB/Core/UC3/Host_UC3.c b/LUFA/Drivers/USB/Core/UC3/Host_UC3.c
index 88a7df5c4..02cb1e68e 100644
--- a/LUFA/Drivers/USB/Core/UC3/Host_UC3.c
+++ b/LUFA/Drivers/USB/Core/UC3/Host_UC3.c
@@ -351,5 +351,22 @@ uint8_t USB_Host_ClearPipeStall(const uint8_t EndpointNum)
 	return USB_Host_SendControlRequest(NULL);

 }

 

+uint8_t USB_Host_SetInterfaceAltSetting(const uint8_t InterfaceNum,

+                                        const uint8_t AltSetting)

+{

+	USB_ControlRequest = (USB_Request_Header_t)

+		{

+			.bmRequestType = (REQDIR_HOSTTODEVICE | REQTYPE_STANDARD | REQREC_INTERFACE),

+			.bRequest      = REQ_SetInterface,

+			.wValue        = AltSetting,

+			.wIndex        = InterfaceNum,

+			.wLength       = 0,

+		};

+

+	Pipe_SelectPipe(PIPE_CONTROLPIPE);

+

+	return USB_Host_SendControlRequest(NULL);

+}

+

 #endif

 

diff --git a/LUFA/Drivers/USB/Core/UC3/Host_UC3.h b/LUFA/Drivers/USB/Core/UC3/Host_UC3.h
index 6040eb32b..c5dfe76fd 100644
--- a/LUFA/Drivers/USB/Core/UC3/Host_UC3.h
+++ b/LUFA/Drivers/USB/Core/UC3/Host_UC3.h
@@ -331,6 +331,19 @@
 			 */

 			uint8_t USB_Host_ClearPipeStall(const uint8_t EndpointIndex);

 

+			/** Selects a given alternative setting for the specfied interface, via a SET INTERFACE standard request to

+			 *  the attached device.

+			 *

+			 *  \note After this routine returns, the control pipe will be selected.

+			 *

+			 *  \param[in] InterfaceIndex  Index of the interface whose alternative setting is to be altered.

+			 *  \param[in] AltSetting      Index of the interface's alternative setting which is to be selected.

+			 *

+			 *  \return A value from the \ref USB_Host_SendControlErrorCodes_t enum to indicate the result.

+			 */

+			uint8_t USB_Host_SetInterfaceAltSetting(const uint8_t InterfaceNum,

+													const uint8_t AltSetting);

+

 	/* Private Interface - For use in library only: */

 	#if !defined(__DOXYGEN__)

 		/* Macros: */