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Altered the CDC Deivice and Host Class drivers' receive byte routines, so that no data is indicated by a negative return value.

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Added auto flushing of OUT data to the CDC Host Class driver's USBTask function to automatically flush the send pipe buffer.
This commit is contained in:
Dean Camera 2010-07-30 03:52:11 +00:00
parent 7c8d16fd7a
commit 24e621a8d8
13 changed files with 89 additions and 59 deletions
Download patch file Download diff file Expand all files Collapse all files

32
LUFA/Drivers/USB/Class/Device/CDC.c
View file

@ -128,11 +128,6 @@ void CDC_Device_USBTask(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
{
if ((USB_DeviceState != DEVICE_STATE_Configured) || !(CDCInterfaceInfo->State.LineEncoding.BaudRateBPS))
return;
Endpoint_SelectEndpoint(CDCInterfaceInfo->Config.DataOUTEndpointNumber);
if (Endpoint_IsOUTReceived() && !(Endpoint_BytesInEndpoint()))
Endpoint_ClearOUT();
CDC_Device_Flush(CDCInterfaceInfo);
}
@ -222,19 +217,24 @@ uint16_t CDC_Device_BytesReceived(USB_ClassInfo_CDC_Device_t* const CDCInterface
}
}
uint8_t CDC_Device_ReceiveByte(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
int16_t CDC_Device_ReceiveByte(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
{
uint8_t ReceivedByte = -1;
if ((USB_DeviceState != DEVICE_STATE_Configured) || !(CDCInterfaceInfo->State.LineEncoding.BaudRateBPS))
return 0;
Endpoint_SelectEndpoint(CDCInterfaceInfo->Config.DataOUTEndpointNumber);
uint8_t DataByte = Endpoint_Read_Byte();
if (!(Endpoint_IsOUTReceived()))
return -1;
else if (Endpoint_BytesInEndpoint())
ReceivedByte = Endpoint_Read_Byte();
if (!(Endpoint_BytesInEndpoint()))
Endpoint_ClearOUT();
return DataByte;
return ReceivedByte;
}
void CDC_Device_SendControlLineStateChange(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
@ -282,24 +282,28 @@ static int CDC_Device_putchar(char c,
static int CDC_Device_getchar(FILE* Stream)
{
if (!(CDC_Device_BytesReceived((USB_ClassInfo_CDC_Device_t*)fdev_get_udata(Stream))))
int16_t ReceivedByte = CDC_Device_ReceiveByte((USB_ClassInfo_CDC_Device_t*)fdev_get_udata(Stream));
if (ReceivedByte < 0)
return _FDEV_EOF;
return CDC_Device_ReceiveByte((USB_ClassInfo_CDC_Device_t*)fdev_get_udata(Stream));
return ReceivedByte;
}
static int CDC_Device_getchar_Blocking(FILE* Stream)
{
while (!(CDC_Device_BytesReceived((USB_ClassInfo_CDC_Device_t*)fdev_get_udata(Stream))))
int16_t ReceivedByte;
while ((ReceivedByte = CDC_Device_ReceiveByte((USB_ClassInfo_CDC_Device_t*)fdev_get_udata(Stream))) < 0)
{
if (USB_DeviceState == DEVICE_STATE_Unattached)
return _FDEV_EOF;
CDC_Device_USBTask((USB_ClassInfo_CDC_Device_t*)fdev_get_udata(Stream));
USB_USBTask();
USB_USBTask();
}
return CDC_Device_ReceiveByte((USB_ClassInfo_CDC_Device_t*)fdev_get_udata(Stream));
return ReceivedByte;
}
#endif

14
LUFA/Drivers/USB/Class/Device/CDC.h
View file

@ -233,7 +233,10 @@
uint8_t CDC_Device_SendByte(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo,
const uint8_t Data) ATTR_NON_NULL_PTR_ARG(1);
/** Determines the number of bytes received by the CDC interface from the host, waiting to be read.
/** Determines the number of bytes received by the CDC interface from the host, waiting to be read. This indicates the number
* of bytes in the OUT endpoint bank only, and thus the number of calls to \ref CDC_Device_ReceiveByte() which are guaranteed to
* succeed immediately. If multiple bytes are to be received, they should be buffered by the user application, as the endpoint
* bank will not be released back to the USB controller until all bytes are read.
*
* \pre This function must only be called when the Device state machine is in the DEVICE_STATE_Configured state or
* the call will fail.
@ -245,17 +248,18 @@
uint16_t CDC_Device_BytesReceived(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
/** Reads a byte of data from the host. If no data is waiting to be read of if a USB host is not connected, the function
* returns 0. The \ref CDC_Device_BytesReceived() function should be queried before data is received to ensure that no data
* underflow occurs.
* returns a negative value. The \ref CDC_Device_BytesReceived() function may be queried in advance to determine how many
* bytes are currently buffered in the CDC interface's data receive endpoint bank, and thus how many repeated calls to this
* function which are guaranteed to succeed.
*
* \pre This function must only be called when the Device state machine is in the DEVICE_STATE_Configured state or
* the call will fail.
*
* \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state.
*
* \return Next received byte from the host, or 0 if no data received.
* \return Next received byte from the host, or a negative value if no data received.
*/
uint8_t CDC_Device_ReceiveByte(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
int16_t CDC_Device_ReceiveByte(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
/** Flushes any data waiting to be sent, ensuring that the send buffer is cleared.
*