Improved demo.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@7384 35acf78f-673a-0410-8e92-d51de3d6d3f4

demos/STM32/CMSIS-STM32F407-DISCOVERY/main.c

@@ -62,8 +62,9 @@ int main(void) {
   osKernelStart();
 
   /* In the ChibiOS/RT CMSIS RTOS implementation the main() is an
-     usable thread.*/
+     usable thread, here we just sleep in a loop printing a message.*/
   while (TRUE) {
+    sdWrite(&SD2, (uint8_t *)"Hello World!\r\n", 14);
     osDelay(500);
   }
 }