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Added PRNT_Host_SendByte() and PRNT_Host_Flush() functions to the Host mode Printer Class driver. 

Modified PRNT_Host_USBTask() to flush the output pipe on each call.
This commit is contained in:
Dean Camera 2010-09-11 04:09:48 +00:00
parent 41c1fb3843
commit 12fb68ea1f
3 changed files with 97 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

60
LUFA/Drivers/USB/Class/Host/Printer.c
View File

@ -125,6 +125,11 @@ static uint8_t DCOMP_PRNT_NextPRNTInterfaceEndpoint(void* CurrentDescriptor)
return DESCRIPTOR_SEARCH_NotFound;
}
void PRNT_Host_USBTask(USB_ClassInfo_PRNT_Host_t* const PRNTInterfaceInfo)
{
PRNT_Host_Flush(PRNTInterfaceInfo);
}
uint8_t PRNT_Host_SetBidirectionalMode(USB_ClassInfo_PRNT_Host_t* const PRNTInterfaceInfo)
{
if (PRNTInterfaceInfo->State.AlternateSetting)
@ -182,6 +187,61 @@ uint8_t PRNT_Host_SoftReset(USB_ClassInfo_PRNT_Host_t* const PRNTInterfaceInfo)
return USB_Host_SendControlRequest(NULL);
}
uint8_t PRNT_Host_Flush(USB_ClassInfo_PRNT_Host_t* const PRNTInterfaceInfo)
{
if ((USB_HostState != HOST_STATE_Configured) || !(PRNTInterfaceInfo->State.IsActive))
return PIPE_READYWAIT_DeviceDisconnected;
uint8_t ErrorCode;
Pipe_SelectPipe(PRNTInterfaceInfo->Config.DataOUTPipeNumber);
Pipe_Unfreeze();
if (!(Pipe_BytesInPipe()))
return PIPE_READYWAIT_NoError;
bool BankFull = !(Pipe_IsReadWriteAllowed());
Pipe_ClearOUT();
if (BankFull)
{
if ((ErrorCode = Pipe_WaitUntilReady()) != PIPE_READYWAIT_NoError)
return ErrorCode;
Pipe_ClearOUT();
}
Pipe_Freeze();
return PIPE_READYWAIT_NoError;
}
uint8_t PRNT_Host_SendByte(USB_ClassInfo_PRNT_Host_t* const PRNTInterfaceInfo,
const uint8_t Data)
{
if ((USB_HostState != HOST_STATE_Configured) || !(PRNTInterfaceInfo->State.IsActive))
return PIPE_READYWAIT_DeviceDisconnected;
uint8_t ErrorCode;
Pipe_SelectPipe(PRNTInterfaceInfo->Config.DataOUTPipeNumber);
Pipe_Unfreeze();
if (!(Pipe_IsReadWriteAllowed()))
{
Pipe_ClearOUT();
if ((ErrorCode = Pipe_WaitUntilReady()) != PIPE_READYWAIT_NoError)
return ErrorCode;
}
Pipe_Write_Byte(Data);
Pipe_Freeze();
return PIPE_READYWAIT_NoError;
}
uint8_t PRNT_Host_SendString(USB_ClassInfo_PRNT_Host_t* const PRNTInterfaceInfo,
void* Buffer,
const uint16_t Length)

48
LUFA/Drivers/USB/Class/Host/Printer.h
View File

@ -114,6 +114,14 @@
};
/* Function Prototypes: */
/** General management task for a given Printer host class interface, required for the correct operation of
* the interface. This should be called frequently in the main program loop, before the master USB management task
* \ref USB_USBTask().
*
* \param[in,out] PRNTInterfaceInfo Pointer to a structure containing a Printer Class host configuration and state.
*/
void PRNT_Host_USBTask(USB_ClassInfo_PRNT_Host_t* const PRNTInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
/** Host interface configuration routine, to configure a given Printer host interface instance using the
* Configuration Descriptor read from an attached USB device. This function automatically updates the given Printer
* instance's state values and configures the pipes required to communicate with the interface if it is found within
@ -159,6 +167,17 @@
*/
uint8_t PRNT_Host_SoftReset(USB_ClassInfo_PRNT_Host_t* const PRNTInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
/** Flushes any data waiting to be sent, ensuring that the send buffer is cleared.
*
* \pre This function must only be called when the Host state machine is in the HOST_STATE_Configured state or the
* call will fail.
*
* \param[in,out] PRNTInterfaceInfo Pointer to a structure containing a Printer Class host configuration and state.
*
* \return A value from the \ref Pipe_WaitUntilReady_ErrorCodes_t enum.
*/
uint8_t PRNT_Host_Flush(USB_ClassInfo_PRNT_Host_t* const PRNTInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
/** Sends the given raw data stream to the attached printer's input endpoint. This should contain commands that the
* printer is able to understand - for example, PCL data. Not all printers accept all printer languages; see
* \ref PRNT_Host_GetDeviceID() for details on determining acceptable languages for an attached printer.
@ -176,6 +195,22 @@
void* Buffer,
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 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 PRNT_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.
*
* \pre This function must only be called when the Host state machine is in the HOST_STATE_Configured state or the
* call will fail.
*
* \param[in,out] PRNTInterfaceInfo Pointer to a structure containing a Printer Class host configuration and state.
* \param[in] Data Byte of data to send to the device.
*
* \return A value from the \ref Pipe_WaitUntilReady_ErrorCodes_t enum.
*/
uint8_t PRNT_Host_SendByte(USB_ClassInfo_PRNT_Host_t* const PRNTInterfaceInfo,
const uint8_t Data) ATTR_NON_NULL_PTR_ARG(1);
/** Determines the number of bytes received by the printer interface from the device, waiting to be read. This indicates the number
* of bytes in the IN pipe bank only, and thus the number of calls to \ref PRNT_Host_ReceiveByte() which are guaranteed to succeed
* immediately. If multiple bytes are to be received, they should be buffered by the user application, as the pipe bank will not be
@ -220,19 +255,6 @@
char* const DeviceIDString,
const uint16_t BufferSize) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2);
/* Inline Functions: */
/** General management task for a given Printer host class interface, required for the correct operation of
* the interface. This should be called frequently in the main program loop, before the master USB management task
* \ref USB_USBTask().
*
* \param[in,out] PRNTInterfaceInfo Pointer to a structure containing a Printer Class host configuration and state.
*/
static inline void PRNT_Host_USBTask(USB_ClassInfo_PRNT_Host_t* const PRNTInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
static inline void PRNT_Host_USBTask(USB_ClassInfo_PRNT_Host_t* const PRNTInterfaceInfo)
{
(void)PRNTInterfaceInfo;
}
/* Private Interface - For use in library only: */
#if !defined(__DOXYGEN__)
/* Macros: */

3
LUFA/ManPages/ChangeLog.txt
View File

@ -16,7 +16,8 @@
* - Added new USB_Device_GetFrameNumber() and USB_Host_GetFrameNumber() functions to retrieve the current USB frame number
* - Added new USB_Host_EnableSOFEvents(), USB_Host_DisableSOFEvents() and EVENT_USB_Host_StartOfFrame() for the user application
* handling of USB Start of Frame events while in USB Host mode
* - Added new PRNT_Host_BytesReceived() and PRNT_Host_ReceiveByte() functions to the Print Host Class driver
* - Added new PRNT_Host_BytesReceived(), PRNT_Host_ReceiveByte(), PRNT_Host_SendByte() and PRNT_Host_Flush() functions to the
* Print Host Class driver
* - Added class specific descriptor type defines with standard USB-IF element naming
* - Added new project makefile template to the library and moved board driver stub files into in a new "CodeTemplates" directory
*