Added stdio.h stream examples for the virtual CDC UART in the CDC host demos.

[pub/USBasp.git] / Demos / Host / LowLevel / CDCHost / CDCHost.c

diff --git a/Demos/Host/LowLevel/CDCHost/CDCHost.c b/Demos/Host/LowLevel/CDCHost/CDCHost.c
index 7a1788b..0b09c5a 100644 (file)
--- a/Demos/Host/LowLevel/CDCHost/CDCHost.c
+++ b/Demos/Host/LowLevel/CDCHost/CDCHost.c
@@ -36,6 +36,52 @@
  \r
 #include "CDCHost.h"\r
 \r
+#if 0\r
+/* NOTE: Here you can set up a standard stream using the created virtual serial port, so that the standard stream functions in\r
+ *       <stdio.h> can be used on the virtual serial port (e.g. fprintf(&USBSerial, "Test"); to print a string).\r
+ */\r
+       \r
+static int CDC_putchar(char c, FILE *stream)\r
+{        \r
+       Pipe_SelectPipe(CDC_DATAPIPE_OUT);\r
+       \r
+       if (Pipe_WaitUntilReady())\r
+         return -1;\r
+\r
+       Pipe_Write_Byte(c);\r
+       Pipe_ClearIN();\r
+       \r
+       return 0;\r
+}\r
+\r
+static int CDC_getchar(FILE *stream)\r
+{\r
+       int c;\r
+\r
+       Pipe_SelectPipe(CDC_DATAPIPE_IN);\r
+       \r
+       for (;;)\r
+       {\r
+               if (Pipe_WaitUntilReady())\r
+                 return -1;\r
+       \r
+               if (!(Pipe_BytesInPipe()))\r
+               {\r
+                       Pipe_ClearOUT();\r
+               }\r
+               else\r
+               {\r
+                       c = Pipe_Read_Byte();\r
+                       break;\r
+               }\r
+       }\r
+       \r
+       return c;\r
+}\r
+\r
+static FILE USBSerial = FDEV_SETUP_STREAM(CDC_putchar, CDC_getchar, _FDEV_SETUP_RW);\r
+#endif\r
+\r
 /** Main program entry point. This routine configures the hardware required by the application, then\r
  *  enters a loop to run the application tasks in sequence.\r
  */\r