X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/6a46f0025a4d44ca2c747745f542e8f475dd9b28..652042111c7c058bd56d9847002f166507f492d4:/LUFA/Drivers/USB/Class/Device/CDC.h

diff --git a/LUFA/Drivers/USB/Class/Device/CDC.h b/LUFA/Drivers/USB/Class/Device/CDC.h
index 857d07335..f5a75077b 100644
--- a/LUFA/Drivers/USB/Class/Device/CDC.h
+++ b/LUFA/Drivers/USB/Class/Device/CDC.h
@@ -213,6 +213,11 @@
 			/** Creates a standard characer stream for the given CDC Device instance so that it can be used with all the regular
 			 *  functions in the avr-libc <stdio.h> library that accept a FILE stream as a destination (e.g. fprintf).
 			 *
+			 *  Reading data from this stream is non-blocking, i.e. in most instances, complete strings cannot be read in by a single
+			 *  fetch, as the endpoint will not be ready at some point in the transmission, aborting the transfer. However, this may
+			 *  be used when the read data is processed byte-per-bye (via getc()) or when the user application will implement its own
+			 *  line buffering.
+			 *
 			 *  \note The created stream can be given as stdout if desired to direct the standard output from all <stdio.h> functions
 			 *        to the given CDC interface.
 			 *
@@ -221,12 +226,21 @@
 			 */
 			void CDC_Device_CreateStream(USB_ClassInfo_CDC_Device_t* CDCInterfaceInfo, FILE* Stream);
 
+			/** Identical to CDC_Device_CreateStream(), except that reads are blocking until the calling stream function terminates
+			 *  the transfer. While blocking, the USB and CDC service tasks are called repeatedly to maintain USB communications.
+			 *
+			 *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class configuration and state
+			 *  \param[in,out] Stream  Pointer to a FILE structure where the created stream should be placed
+			 */
+			void CDC_Device_CreateBlockingStream(USB_ClassInfo_CDC_Device_t* CDCInterfaceInfo, FILE* Stream);
+
 	/* Private Interface - For use in library only: */
 	#if !defined(__DOXYGEN__)
 		/* Function Prototypes: */
 			#if defined(INCLUDE_FROM_CDC_CLASS_DEVICE_C)
 				static int CDC_Device_putchar(char c, FILE* Stream);
 				static int CDC_Device_getchar(FILE* Stream);
+				static int CDC_Device_getchar_Blocking(FILE* Stream);
 				
 				void CDC_Device_Event_Stub(void);
 				void EVENT_CDC_Device_LineEncodingChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)