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authorDean Camera <dean@fourwalledcubicle.com>2009-11-13 13:24:04 +0000
committerDean Camera <dean@fourwalledcubicle.com>2009-11-13 13:24:04 +0000
commit588886878e0fe948417123b57c108a1bd7992f85 (patch)
treeb2a87de1c9a49c8c10f9978770a089071d03cb2e
parente625fd6df33ab2112779728622a717589f0b8417 (diff)
downloadlufa-588886878e0fe948417123b57c108a1bd7992f85.tar.gz
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lufa-588886878e0fe948417123b57c108a1bd7992f85.zip
Corrections, improvements and additions to the incomplete RNDISHost demo.
Change device demos which use the joystick to use the natural UP, DOWN, LEFT, RIGHT ordering in all demos when checking the joystick's position.
-rw-r--r--Demos/Device/ClassDriver/CDCMouse/CDCMouse.c6
-rw-r--r--Demos/Device/ClassDriver/Joystick/Joystick.c6
-rw-r--r--Demos/Device/ClassDriver/KeyboardMouse/KeyboardMouse.c7
-rw-r--r--Demos/Device/ClassDriver/Mouse/Mouse.c6
-rw-r--r--Demos/Device/LowLevel/Joystick/Joystick.c6
-rw-r--r--Demos/Device/LowLevel/Mouse/Mouse.c6
-rw-r--r--Demos/Host/Incomplete/RNDISEthernetHost/Lib/RNDISCommands.c47
-rw-r--r--Demos/Host/Incomplete/RNDISEthernetHost/Lib/RNDISCommands.h15
-rw-r--r--Demos/Host/Incomplete/RNDISEthernetHost/RNDISEthernetHost.c36
-rw-r--r--LUFA/Drivers/USB/LowLevel/OTG.h2
-rw-r--r--LUFA/Drivers/USB/USB.h9
-rw-r--r--LUFA/ManPages/ChangeLog.txt1
-rw-r--r--LUFA/ManPages/CompileTimeTokens.txt2
13 files changed, 90 insertions, 59 deletions
diff --git a/Demos/Device/ClassDriver/CDCMouse/CDCMouse.c b/Demos/Device/ClassDriver/CDCMouse/CDCMouse.c
index b625327fb..e21e0bcb4 100644
--- a/Demos/Device/ClassDriver/CDCMouse/CDCMouse.c
+++ b/Demos/Device/ClassDriver/CDCMouse/CDCMouse.c
@@ -210,10 +210,10 @@ bool CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDIn
else if (JoyStatus_LCL & JOY_DOWN)
MouseReport->Y = 1;
- if (JoyStatus_LCL & JOY_RIGHT)
- MouseReport->X = 1;
- else if (JoyStatus_LCL & JOY_LEFT)
+ if (JoyStatus_LCL & JOY_LEFT)
MouseReport->X = -1;
+ else if (JoyStatus_LCL & JOY_RIGHT)
+ MouseReport->X = 1;
if (JoyStatus_LCL & JOY_PRESS)
MouseReport->Button = (1 << 0);
diff --git a/Demos/Device/ClassDriver/Joystick/Joystick.c b/Demos/Device/ClassDriver/Joystick/Joystick.c
index 36a74a218..00bcb6fe4 100644
--- a/Demos/Device/ClassDriver/Joystick/Joystick.c
+++ b/Demos/Device/ClassDriver/Joystick/Joystick.c
@@ -148,10 +148,10 @@ bool CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDIn
else if (JoyStatus_LCL & JOY_DOWN)
JoystickReport->Y = 100;
- if (JoyStatus_LCL & JOY_RIGHT)
- JoystickReport->X = 100;
- else if (JoyStatus_LCL & JOY_LEFT)
+ if (JoyStatus_LCL & JOY_LEFT)
JoystickReport->X = -100;
+ else if (JoyStatus_LCL & JOY_RIGHT)
+ JoystickReport->X = 100;
if (JoyStatus_LCL & JOY_PRESS)
JoystickReport->Button = (1 << 1);
diff --git a/Demos/Device/ClassDriver/KeyboardMouse/KeyboardMouse.c b/Demos/Device/ClassDriver/KeyboardMouse/KeyboardMouse.c
index 77aa2a91a..caa33f907 100644
--- a/Demos/Device/ClassDriver/KeyboardMouse/KeyboardMouse.c
+++ b/Demos/Device/ClassDriver/KeyboardMouse/KeyboardMouse.c
@@ -170,6 +170,7 @@ bool CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDIn
uint8_t JoyStatus_LCL = Joystick_GetStatus();
uint8_t ButtonStatus_LCL = Buttons_GetStatus();
+ /* Determine which interface must have its report generated */
if (HIDInterfaceInfo == &Keyboard_HID_Interface)
{
USB_KeyboardReport_Data_t* KeyboardReport = (USB_KeyboardReport_Data_t*)ReportData;
@@ -207,10 +208,10 @@ bool CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDIn
else if (JoyStatus_LCL & JOY_DOWN)
MouseReport->Y = 1;
- if (JoyStatus_LCL & JOY_RIGHT)
- MouseReport->X = 1;
- else if (JoyStatus_LCL & JOY_LEFT)
+ if (JoyStatus_LCL & JOY_LEFT)
MouseReport->X = -1;
+ else if (JoyStatus_LCL & JOY_RIGHT)
+ MouseReport->X = 1;
if (JoyStatus_LCL & JOY_PRESS)
MouseReport->Button = (1 << 0);
diff --git a/Demos/Device/ClassDriver/Mouse/Mouse.c b/Demos/Device/ClassDriver/Mouse/Mouse.c
index c53d429a4..c29cc15ef 100644
--- a/Demos/Device/ClassDriver/Mouse/Mouse.c
+++ b/Demos/Device/ClassDriver/Mouse/Mouse.c
@@ -148,10 +148,10 @@ bool CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDIn
else if (JoyStatus_LCL & JOY_DOWN)
MouseReport->Y = 1;
- if (JoyStatus_LCL & JOY_RIGHT)
- MouseReport->X = 1;
- else if (JoyStatus_LCL & JOY_LEFT)
+ if (JoyStatus_LCL & JOY_LEFT)
MouseReport->X = -1;
+ else if (JoyStatus_LCL & JOY_RIGHT)
+ MouseReport->X = 1;
if (JoyStatus_LCL & JOY_PRESS)
MouseReport->Button = (1 << 0);
diff --git a/Demos/Device/LowLevel/Joystick/Joystick.c b/Demos/Device/LowLevel/Joystick/Joystick.c
index 6d04c8fa6..aa5244c15 100644
--- a/Demos/Device/LowLevel/Joystick/Joystick.c
+++ b/Demos/Device/LowLevel/Joystick/Joystick.c
@@ -156,10 +156,10 @@ bool GetNextReport(USB_JoystickReport_Data_t* ReportData)
else if (JoyStatus_LCL & JOY_DOWN)
ReportData->Y = 100;
- if (JoyStatus_LCL & JOY_RIGHT)
- ReportData->X = 100;
- else if (JoyStatus_LCL & JOY_LEFT)
+ if (JoyStatus_LCL & JOY_LEFT)
ReportData->X = -100;
+ else if (JoyStatus_LCL & JOY_RIGHT)
+ ReportData->X = 100;
if (JoyStatus_LCL & JOY_PRESS)
ReportData->Button = (1 << 1);
diff --git a/Demos/Device/LowLevel/Mouse/Mouse.c b/Demos/Device/LowLevel/Mouse/Mouse.c
index 2f7a63f7f..4b318e30c 100644
--- a/Demos/Device/LowLevel/Mouse/Mouse.c
+++ b/Demos/Device/LowLevel/Mouse/Mouse.c
@@ -238,10 +238,10 @@ void CreateMouseReport(USB_MouseReport_Data_t* ReportData)
else if (JoyStatus_LCL & JOY_DOWN)
ReportData->Y = 1;
- if (JoyStatus_LCL & JOY_RIGHT)
- ReportData->X = 1;
- else if (JoyStatus_LCL & JOY_LEFT)
+ if (JoyStatus_LCL & JOY_LEFT)
ReportData->X = -1;
+ else if (JoyStatus_LCL & JOY_RIGHT)
+ ReportData->X = 1;
if (JoyStatus_LCL & JOY_PRESS)
ReportData->Button = (1 << 0);
diff --git a/Demos/Host/Incomplete/RNDISEthernetHost/Lib/RNDISCommands.c b/Demos/Host/Incomplete/RNDISEthernetHost/Lib/RNDISCommands.c
index e248b18da..4802bedb9 100644
--- a/Demos/Host/Incomplete/RNDISEthernetHost/Lib/RNDISCommands.c
+++ b/Demos/Host/Incomplete/RNDISEthernetHost/Lib/RNDISCommands.c
@@ -98,18 +98,20 @@ uint8_t RNDIS_KeepAlive(void)
return HOST_SENDCONTROL_Successful;
}
-uint8_t RNDIS_InitializeDevice(uint16_t MaxPacketSize, RNDIS_Initialize_Complete_t* InitMessageResponse)
+uint8_t RNDIS_InitializeDevice(uint16_t HostMaxPacketSize, uint16_t* DeviceMaxPacketSize)
{
uint8_t ErrorCode;
- RNDIS_Initialize_Message_t InitMessage;
+ RNDIS_Initialize_Message_t InitMessage;
+ RNDIS_Initialize_Complete_t InitMessageResponse;
InitMessage.MessageType = REMOTE_NDIS_INITIALIZE_MSG;
InitMessage.MessageLength = sizeof(RNDIS_Initialize_Message_t);
InitMessage.RequestId = RequestID++;
+
InitMessage.MajorVersion = REMOTE_NDIS_VERSION_MAJOR;
InitMessage.MinorVersion = REMOTE_NDIS_VERSION_MINOR;
- InitMessage.MaxTransferSize = sizeof(RNDIS_Packet_Message_t) + MaxPacketSize;
+ InitMessage.MaxTransferSize = HostMaxPacketSize;
if ((ErrorCode = RNDIS_SendEncapsulatedCommand(&InitMessage,
sizeof(RNDIS_Initialize_Message_t))) != HOST_SENDCONTROL_Successful)
@@ -117,11 +119,16 @@ uint8_t RNDIS_InitializeDevice(uint16_t MaxPacketSize, RNDIS_Initialize_Complete
return ErrorCode;
}
- if ((ErrorCode = RNDIS_GetEncapsulatedResponse(InitMessageResponse,
+ if ((ErrorCode = RNDIS_GetEncapsulatedResponse(&InitMessageResponse,
sizeof(RNDIS_Initialize_Complete_t))) != HOST_SENDCONTROL_Successful)
{
return ErrorCode;
}
+
+ if (InitMessageResponse.Status != REMOTE_NDIS_STATUS_SUCCESS)
+ return RNDIS_COMMAND_FAILED;
+
+ *DeviceMaxPacketSize = InitMessageResponse.MaxTransferSize;
return HOST_SENDCONTROL_Successful;
}
@@ -138,13 +145,13 @@ uint8_t RNDIS_SetRNDISProperty(uint32_t Oid, void* Buffer, uint16_t Length)
RNDIS_Set_Complete_t SetMessageResponse;
- SetMessageData.SetMessage.MessageType = REMOTE_NDIS_SET_MSG;
- SetMessageData.SetMessage.MessageLength = sizeof(RNDIS_Set_Message_t) + Length;
- SetMessageData.SetMessage.RequestId = RequestID++;
+ SetMessageData.SetMessage.MessageType = REMOTE_NDIS_SET_MSG;
+ SetMessageData.SetMessage.MessageLength = sizeof(RNDIS_Set_Message_t) + Length;
+ SetMessageData.SetMessage.RequestId = RequestID++;
- SetMessageData.SetMessage.Oid = Oid;
+ SetMessageData.SetMessage.Oid = Oid;
SetMessageData.SetMessage.InformationBufferLength = Length;
- SetMessageData.SetMessage.InformationBufferOffset = 0;
+ SetMessageData.SetMessage.InformationBufferOffset = (sizeof(RNDIS_Set_Message_t) - sizeof(RNDIS_Message_Header_t));
SetMessageData.SetMessage.DeviceVcHandle = 0;
memcpy(&SetMessageData.ContigiousBuffer, Buffer, Length);
@@ -161,19 +168,22 @@ uint8_t RNDIS_SetRNDISProperty(uint32_t Oid, void* Buffer, uint16_t Length)
return ErrorCode;
}
+ if (SetMessageResponse.Status != REMOTE_NDIS_STATUS_SUCCESS)
+ return RNDIS_COMMAND_FAILED;
+
return HOST_SENDCONTROL_Successful;
}
-uint8_t RNDIS_QueryRNDISProperty(uint32_t Oid, void* Buffer, uint16_t Length)
+uint8_t RNDIS_QueryRNDISProperty(uint32_t Oid, void* Buffer, uint16_t MaxLength)
{
uint8_t ErrorCode;
- RNDIS_Query_Message_t QueryMessage;
+ RNDIS_Query_Message_t QueryMessage;
struct
{
RNDIS_Query_Complete_t QueryMessageResponse;
- uint8_t ContigiousBuffer[Length];
+ uint8_t ContigiousBuffer[MaxLength];
} QueryMessageResponseData;
QueryMessage.MessageType = REMOTE_NDIS_QUERY_MSG;
@@ -181,7 +191,7 @@ uint8_t RNDIS_QueryRNDISProperty(uint32_t Oid, void* Buffer, uint16_t Length)
QueryMessage.RequestId = RequestID++;
QueryMessage.Oid = Oid;
- QueryMessage.InformationBufferLength = Length;
+ QueryMessage.InformationBufferLength = 0;
QueryMessage.InformationBufferOffset = 0;
QueryMessage.DeviceVcHandle = 0;
@@ -197,12 +207,15 @@ uint8_t RNDIS_QueryRNDISProperty(uint32_t Oid, void* Buffer, uint16_t Length)
return ErrorCode;
}
- memcpy(Buffer, &QueryMessageResponseData.ContigiousBuffer, Length);
+ if (QueryMessageResponseData.QueryMessageResponse.Status != REMOTE_NDIS_STATUS_SUCCESS)
+ return RNDIS_COMMAND_FAILED;
+
+ memcpy(Buffer, &QueryMessageResponseData.ContigiousBuffer, MaxLength);
return HOST_SENDCONTROL_Successful;
}
-uint8_t RNDIS_GetPacketSize(uint16_t* PacketSize)
+uint8_t RNDIS_GetPacketLength(uint16_t* PacketLength)
{
uint8_t ErrorCode;
@@ -213,7 +226,9 @@ uint8_t RNDIS_GetPacketSize(uint16_t* PacketSize)
return ErrorCode;
}
- *PacketSize = (uint16_t)DeviceMessage.DataLength;
+ *PacketLength = (uint16_t)DeviceMessage.DataLength;
+
+ Pipe_Discard_Stream(DeviceMessage.DataOffset - (sizeof(RNDIS_Packet_Message_t) - sizeof(RNDIS_Message_Header_t)));
return PIPE_RWSTREAM_NoError;
}
diff --git a/Demos/Host/Incomplete/RNDISEthernetHost/Lib/RNDISCommands.h b/Demos/Host/Incomplete/RNDISEthernetHost/Lib/RNDISCommands.h
index 55f848bd0..af3e7cc92 100644
--- a/Demos/Host/Incomplete/RNDISEthernetHost/Lib/RNDISCommands.h
+++ b/Demos/Host/Incomplete/RNDISEthernetHost/Lib/RNDISCommands.h
@@ -188,22 +188,25 @@
#define REMOTE_NDIS_VERSION_MINOR 0x00
/** Pipe number for the RNDIS data IN pipe */
- #define RNDIS_DATAPIPE_IN 1
+ #define RNDIS_DATAPIPE_IN 1
/** Pipe number for the RNDIS data OUT pipe */
- #define RNDIS_DATAPIPE_OUT 2
+ #define RNDIS_DATAPIPE_OUT 2
/** Pipe number for the RNDIS notification pipe */
- #define RNDIS_NOTIFICATIONPIPE 3
+ #define RNDIS_NOTIFICATIONPIPE 3
+ /** Additional error code for RNDIS functions when a device returns a logical command failure */
+ #define RNDIS_COMMAND_FAILED 0xC0
+
/* Function Prototypes: */
uint8_t RNDIS_SendEncapsulatedCommand(void* Buffer, uint16_t Length);
uint8_t RNDIS_GetEncapsulatedResponse(void* Buffer, uint16_t Length);
uint8_t RNDIS_KeepAlive(void);
- uint8_t RNDIS_InitializeDevice(uint16_t MaxPacketSize, RNDIS_Initialize_Complete_t* InitMessageResponse);
+ uint8_t RNDIS_InitializeDevice(uint16_t HostMaxPacketSize, uint16_t* DeviceMaxPacketSize);
uint8_t RNDIS_SetRNDISProperty(uint32_t Oid, void* Buffer, uint16_t Length);
- uint8_t RNDIS_QueryRNDISProperty(uint32_t Oid, void* Buffer, uint16_t Length);
- uint8_t RNDIS_GetPacketSize(uint16_t* PacketSize);
+ uint8_t RNDIS_QueryRNDISProperty(uint32_t Oid, void* Buffer, uint16_t MaxLength);
+ uint8_t RNDIS_GetPacketLength(uint16_t* PacketLength);
#endif
diff --git a/Demos/Host/Incomplete/RNDISEthernetHost/RNDISEthernetHost.c b/Demos/Host/Incomplete/RNDISEthernetHost/RNDISEthernetHost.c
index a64dfbdf2..c84f0c00c 100644
--- a/Demos/Host/Incomplete/RNDISEthernetHost/RNDISEthernetHost.c
+++ b/Demos/Host/Incomplete/RNDISEthernetHost/RNDISEthernetHost.c
@@ -138,31 +138,33 @@ void PrintIncommingPackets(void)
puts_P(PSTR("DATA IN\r\n"));
- uint16_t PacketSize;
- if ((ErrorCode = RNDIS_GetPacketSize(&PacketSize)) != HOST_SENDCONTROL_Successful)
+ uint16_t PacketLength;
+ if ((ErrorCode = RNDIS_GetPacketLength(&PacketLength)) != HOST_SENDCONTROL_Successful)
{
printf_P(PSTR(ESC_FG_RED "Packet Reception Error.\r\n"
- " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
+ " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
+ return;
}
- else if (PacketSize > 2048)
+
+ printf_P(PSTR("***PACKET (Size %d)***\r\n"), PacketLength);
+
+ if (PacketLength > 1024)
{
- printf_P(PSTR(ESC_FG_RED "Packet of Size %d Too Large.\r\n" ESC_FG_WHITE), PacketSize);
- Pipe_Discard_Stream(PacketSize);
+ puts_P(PSTR(ESC_FG_RED "Packet too large.\r\n" ESC_FG_WHITE));
+ Pipe_Discard_Stream(PacketLength);
}
else
{
- uint8_t PacketBuffer[PacketSize];
+ uint8_t PacketBuffer[PacketLength];
- Pipe_Read_Stream_LE(&PacketBuffer, PacketSize);
+ Pipe_Read_Stream_LE(&PacketBuffer, PacketLength);
- printf("***PACKET (Size %d)***\r\n", PacketSize);
- for (uint16_t i = 0; i < PacketSize; i++)
- {
- printf("%02x ", PacketBuffer[i]);
- }
- printf("\r\n\r\n");
+ for (uint16_t i = 0; i < PacketLength; i++)
+ printf("%02x ", PacketBuffer[i]);
}
+ printf("\r\n\r\n");
+
LEDs_SetAllLEDs(LEDMASK_USB_READY);
Pipe_ClearIN();
@@ -213,8 +215,8 @@ void RNDIS_Host_Task(void)
break;
}
- RNDIS_Initialize_Complete_t InitMessageResponse;
- if ((ErrorCode = RNDIS_InitializeDevice(1024, &InitMessageResponse)) != HOST_SENDCONTROL_Successful)
+ uint16_t DeviceMaxPacketSize;
+ if ((ErrorCode = RNDIS_InitializeDevice(1024, &DeviceMaxPacketSize)) != HOST_SENDCONTROL_Successful)
{
printf_P(PSTR(ESC_FG_RED "Error Initializing Device.\r\n"
" -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
@@ -227,7 +229,7 @@ void RNDIS_Host_Task(void)
break;
}
- printf_P(PSTR("Device Max Transfer Size: %lu bytes.\r\n"), InitMessageResponse.MaxTransferSize);
+ printf_P(PSTR("Device Max Transfer Size: %lu bytes.\r\n"), DeviceMaxPacketSize);
/* We set the default filter to only receive packets we would be interested in */
uint32_t PacketFilter = (RNDIS_PACKET_TYPE_DIRECTED | RNDIS_PACKET_TYPE_BROADCAST | RNDIS_PACKET_TYPE_ALL_MULTICAST);
diff --git a/LUFA/Drivers/USB/LowLevel/OTG.h b/LUFA/Drivers/USB/LowLevel/OTG.h
index a5ad6bad7..942079904 100644
--- a/LUFA/Drivers/USB/LowLevel/OTG.h
+++ b/LUFA/Drivers/USB/LowLevel/OTG.h
@@ -29,7 +29,7 @@
*/
/** \ingroup Group_USB
- * @defgroup Group_OTGManagement USB On The Go (OTG) Management
+ * @defgroup Group_OTG USB On The Go (OTG) Management
*
* This module contains macros for embedded USB hosts with dual role On The Go capabilities, for managing role
* exchange. OTG is a way for two USB dual role devices to talk to one another directly without fixed device/host
diff --git a/LUFA/Drivers/USB/USB.h b/LUFA/Drivers/USB/USB.h
index b9b506fb1..223967008 100644
--- a/LUFA/Drivers/USB/USB.h
+++ b/LUFA/Drivers/USB/USB.h
@@ -54,6 +54,15 @@
* Driver and framework for the USB controller hardware on the USB series of AVR microcontrollers. This module
* consists of many submodules, and is designed to provide an easy way to configure and control USB host, device
* or OTG mode USB applications.
+ *
+ * The USB stack requires the sole control over the USB controller in the microcontroller only; i.e. it does not
+ * require any additional AVR timers, etc. to operate. This ensures that the USB stack requires as few resources
+ * as possible.
+ *
+ * The USB stack can be used in Device Mode for connections to USB Hosts (see \ref Group_Device), in Host mode for
+ * hosting of other USB devices (see \ref Group_Host), or as a dual role device which can either act as a USB host
+ * or device depending on what peripheral is connected (see \ref Group_OTG). Both modes also require a common set
+ * of USB management functions found \ref Group_USBManagement.
*/
/** \ingroup Group_USB
diff --git a/LUFA/ManPages/ChangeLog.txt b/LUFA/ManPages/ChangeLog.txt
index b3a3d927d..d58a070af 100644
--- a/LUFA/ManPages/ChangeLog.txt
+++ b/LUFA/ManPages/ChangeLog.txt
@@ -33,6 +33,7 @@
* item's attributes, to expose more information on the item (including it's type, collection path, etc.)
* - Changed MouseHostWithParser demos to check that the report items have a Mouse usage collection as a parent at some point,
* to prevent Joysticks from enumerating with the demo
+ * - Corrected the name of the misnamed USB_GetDeviceConfigDescriptor() function to USB_Host_GetDeviceConfigDescriptor().
*
* <b>Fixed:</b>
* - Fixed PrinterHost demo returning invalid Device ID data when the attached device does not have a
diff --git a/LUFA/ManPages/CompileTimeTokens.txt b/LUFA/ManPages/CompileTimeTokens.txt
index f41c196c6..d8d4edbb3 100644
--- a/LUFA/ManPages/CompileTimeTokens.txt
+++ b/LUFA/ManPages/CompileTimeTokens.txt
@@ -177,5 +177,5 @@
* <b>INTERRUPT_CONTROL_ENDPOINT</b> - ( \ref Group_USBManagement ) \n
* Some applications prefer to not call the USB_USBTask() management task reguarly while in device mode, as it can complicate code significantly.
* Instead, when device mode is used this token can be passed to the library via the -D switch to allow the library to manage the USB control
- * endpoint entirely via interrupts asynchronously to the user application.
+ * endpoint entirely via USB controller interrupts asynchronously to the user application.
*/