X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/f7ab433c67b86723385ec05ee9c7b96dd18e6dde..8c6c27d88bb40ecf55f369fc4499ec990d2d93d2:/Demos/Device/ClassDriver/CDC/CDC.c

diff --git a/Demos/Device/ClassDriver/CDC/CDC.c b/Demos/Device/ClassDriver/CDC/CDC.c
index 90cbaf0bc..8940ae042 100644
--- a/Demos/Device/ClassDriver/CDC/CDC.c
+++ b/Demos/Device/ClassDriver/CDC/CDC.c
@@ -60,27 +60,10 @@ USB_ClassInfo_CDC_Device_t VirtualSerial_CDC_Interface =
 			},
 	};
 
-#if 0
-/* NOTE: Here you can set up a standard stream using the created virtual serial port, so that the standard stream functions in
- *       <stdio.h> can be used on the virtual serial port (e.g. fprintf(&USBSerial, "Test"); to print a string).
+/** Standard file stream for the CDC interface when set up, so that the virtual CDC COM port can be
+ *  used like any regular character stream in the C APIs
  */
-
-static int CDC_putchar(char c, FILE *stream)
-{
-	CDC_Device_SendByte(&VirtualSerial_CDC_Interface, c);
-	return 0;
-}
-
-static int CDC_getchar(FILE *stream)
-{
-	if (!(CDC_Device_BytesReceived(&VirtualSerial_CDC_Interface)))
-	  return -1;
-
-	return CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface);
-}
-
-static FILE USBSerial = FDEV_SETUP_STREAM(CDC_putchar, CDC_getchar, _FDEV_SETUP_RW);
-#endif
+static FILE USBSerialStream;
 
 /** Main program entry point. This routine contains the overall program flow, including initial
  *  setup of all components and the main program loop.
@@ -89,6 +72,9 @@ int main(void)
 {
 	SetupHardware();
 	
+	/* Create a regular character stream for the interface so that it can be used with the stdio.h functions */
+	CDC_Device_CreateStream(&VirtualSerial_CDC_Interface, &USBSerialStream);
+
 	LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
 
 	for (;;)
@@ -143,8 +129,12 @@ void CheckJoystickMovement(void)
 	if ((ReportString != NULL) && (ActionSent == false))
 	{
 		ActionSent = true;
-		
-		CDC_Device_SendString(&VirtualSerial_CDC_Interface, ReportString, strlen(ReportString));		
+
+		/* Write the string to the virtual COM port via the created character stream */
+		fputs(ReportString, &USBSerialStream);
+
+		/* Alternatively, without the stream: */
+		// CDC_Device_SendString(&VirtualSerial_CDC_Interface, ReportString, strlen(ReportString));
 	}
 }