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Prevent the CDC Device Class driver from sending empty IN packets on every service task call - only send termination packets when data is in the endpoint.

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This commit is contained in:
Dean Camera 2009-09-10 06:41:57 +00:00
parent b221e7d175
commit e918d977b1
4 changed files with 23 additions and 19 deletions
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34
LUFA/Drivers/USB/Class/Device/CDC.c
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@ -143,11 +143,11 @@ uint8_t CDC_Device_SendByte(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo,
Endpoint_SelectEndpoint(CDCInterfaceInfo->Config.DataINEndpointNumber);
if (!(Endpoint_IsReadWriteAllowed()))
{
uint8_t ErrorCode;
{
Endpoint_ClearIN();
uint8_t ErrorCode;
if ((ErrorCode = Endpoint_WaitUntilReady()) != ENDPOINT_READYWAIT_NoError)
return ErrorCode;
}
@ -161,20 +161,26 @@ uint8_t CDC_Device_Flush(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
if ((USB_DeviceState != DEVICE_STATE_Configured) || !(CDCInterfaceInfo->State.LineEncoding.BaudRateBPS))
return ENDPOINT_READYWAIT_NoError;
Endpoint_SelectEndpoint(CDCInterfaceInfo->Config.DataINEndpointNumber);
if (Endpoint_BytesInEndpoint())
{
uint8_t ErrorCode;
uint8_t ErrorCode;
Endpoint_ClearIN();
if ((ErrorCode = Endpoint_WaitUntilReady()) != ENDPOINT_READYWAIT_NoError)
return ErrorCode;
}
Endpoint_SelectEndpoint(CDCInterfaceInfo->Config.DataINEndpointNumber);
if (!(Endpoint_BytesInEndpoint()))
return ENDPOINT_READYWAIT_NoError;
bool BankFull = !(Endpoint_IsReadWriteAllowed());
Endpoint_ClearIN();
return Endpoint_WaitUntilReady();
if (BankFull)
{
if ((ErrorCode = Endpoint_WaitUntilReady()) != ENDPOINT_READYWAIT_NoError)
return ErrorCode;
Endpoint_ClearIN();
}
return ENDPOINT_READYWAIT_NoError;
}
uint16_t CDC_Device_BytesReceived(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)