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Added support to the MIDI Class drivers for packed data, where multiple MIDI events are packed into a single USB packet. Added new MIDI Class driver flush routines to override packing behaviour.

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This commit is contained in:
Dean Camera 2010-01-05 13:52:34 +00:00
parent 60e9641222
commit d97db1120b
13 changed files with 113 additions and 14 deletions
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10
LUFA/Drivers/USB/Class/Host/CDC.h
View file

@ -175,7 +175,9 @@
uint8_t CDC_Host_SendControlLineStateChange(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
/** Sends a given string to the attached USB device, if connected. If a device is not connected when the function is called, the
* string is discarded.
* string is discarded. Bytes will be queued for transmission to the device until either the pipe bank becomes full, or the
* \ref CDC_Host_Flush() function is called to flush the pending data to the host. This allows for multiple bytes to be
* packed into a single pipe packet, increasing data throughput.
*
* \note This function must only be called when the Host state machine is in the HOST_STATE_Configured state or the
* call will fail.
@ -189,8 +191,10 @@
uint8_t CDC_Host_SendString(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo, char* Data, const uint16_t Length)
ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2);
/** Sends a given byte to the attached USB device, if connected. If a host is not connected when the function is called, the
* byte is discarded.
/** Sends a given byte to the attached USB device, if connected. If a device is not connected when the function is called, the
* byte is discarded. Bytes will be queued for transmission to the device until either the pipe bank becomes full, or the
* \ref CDC_Host_Flush() function is called to flush the pending data to the host. This allows for multiple bytes to be
* packed into a single pipe packet, increasing data throughput.
*
* \note This function must only be called when the Host state machine is in the HOST_STATE_Configured state or the
* call will fail.

27
LUFA/Drivers/USB/Class/Host/MIDI.c
View file

@ -122,6 +122,26 @@ static uint8_t DComp_MIDI_Host_NextMIDIStreamingDataEndpoint(void* const Current
return DESCRIPTOR_SEARCH_NotFound;
}
uint8_t MIDI_Host_Flush(USB_ClassInfo_MIDI_Host_t* const MIDIInterfaceInfo)
{
if (USB_HostState != HOST_STATE_Configured)
return PIPE_RWSTREAM_DeviceDisconnected;
uint8_t ErrorCode;
Pipe_SelectPipe(MIDIInterfaceInfo->Config.DataOUTPipeNumber);
if (Pipe_BytesInPipe())
{
Pipe_ClearOUT();
if ((ErrorCode = Pipe_WaitUntilReady()) != PIPE_READYWAIT_NoError)
return ErrorCode;
}
return PIPE_READYWAIT_NoError;
}
uint8_t MIDI_Host_SendEventPacket(USB_ClassInfo_MIDI_Host_t* const MIDIInterfaceInfo, MIDI_EventPacket_t* const Event)
{
if ((USB_HostState != HOST_STATE_Configured) || !(MIDIInterfaceInfo->State.IsActive))
@ -136,7 +156,8 @@ uint8_t MIDI_Host_SendEventPacket(USB_ClassInfo_MIDI_Host_t* const MIDIInterface
if ((ErrorCode = Pipe_Write_Stream_LE(Event, sizeof(MIDI_EventPacket_t), NO_STREAM_CALLBACK)) != PIPE_RWSTREAM_NoError)
return ErrorCode;
Pipe_ClearOUT();
if (!(Pipe_IsReadWriteAllowed()))
Pipe_ClearOUT();
}
return PIPE_RWSTREAM_NoError;
@ -153,7 +174,9 @@ bool MIDI_Host_ReceiveEventPacket(USB_ClassInfo_MIDI_Host_t* const MIDIInterface
return false;
Pipe_Read_Stream_LE(Event, sizeof(MIDI_EventPacket_t), NO_STREAM_CALLBACK);
Pipe_ClearIN();
if (!(Pipe_IsReadWriteAllowed()))
Pipe_ClearIN();
return true;
}

11
LUFA/Drivers/USB/Class/Host/MIDI.h
View file

@ -125,6 +125,17 @@
uint8_t MIDI_Host_SendEventPacket(USB_ClassInfo_MIDI_Host_t* const MIDIInterfaceInfo,
MIDI_EventPacket_t* const Event) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2);
/** Flushes the MIDI send buffer, sending any queued MIDI events to the device. This should be called to override the
* \ref MIDI_Host_SendEventPacket() function's packing behaviour, to flush queued events. Events are queued into the
* pipe bank until either the pipe bank is full, or \ref MIDI_Host_Flush() is called. This allows for multiple MIDI
* events to be packed into a single pipe packet, increasing data throughput.
*
* \param[in,out] MIDIInterfaceInfo Pointer to a structure containing a MIDI Class configuration and state
*
* \return A value from the \ref Pipe_WaitUntilReady_ErrorCodes_t enum
*/
uint8_t MIDI_Host_Flush(USB_ClassInfo_MIDI_Host_t* const MIDIInterfaceInfo);
/** Receives a MIDI event packet from the device.
*
* \note This function must only be called when the Host state machine is in the HOST_STATE_Configured state or the