Added applicaiton flow.

Inc/murasaki_2_ug.hpp

@@ -453,6 +453,63 @@
  * }
  * @endcode
  *
+ * In this sample, the first half of the InitPlatform() is building a murasaki::debugger
+ * variable. Because this variable is utilized for the debug of the entire application,
+ * there is a value to make it at first.
+ *
+ * Probably the most critical statement in this part is creation of the DebuggerUart class object.
+ *
+ * @code
+ *    murasaki::platform.uart_console = new murasaki::DebuggerUart(&huart3);
+ * @endcode
+ *
+ * In this statement, the DebgguerUart receives the pointer to the huart3 as a parameter.
+ * The hauart3 is a handle variable of the UART3 generated by CubeMx. Let's remind the
+ * UART3 is utilized as communication path through the USB. So, in this sample code,
+ * we are making debugging console through the USB-serial line of the Nucleo F722ZE board.
+ *
+ * Because the huart3 is generated into the main.c directory, we have to declare this
+ * variable as external variable. You can find the declaration around the top of the
+ * Src/murasaki_platform.cpp.
+ *
+ * @code
+ * extern UART_HandleTypeDef huart3;
+ * @endcode
+ *
+ * Note that the UART port number is vary among the different Nucleo board. So, the
+ * porting programmer have responsibility to refer the right UART.
+ *
+ * The second half of the InitPlatform() is the creation part of the other peripheral
+ * object. This part is fully depend on the application. Programmer can define any
+ * object, by modifying the murasaki::Platform struct in the Inc/platform_defs.hpp.
+ *
+ * The second function called from the @ref StartDefaultTask() is the @ref ExecPlatform().
+ * This function is also defined in the @ref Src/murasaki_platform.cpp.
+ *
+ *
+ * @code
+ * void ExecPlatform()
+ * {
+
+ *     murasaki::platform.task1->Start();
+
+
+ *     // print a message with counter value to the console.
+ *     murasaki::debugger->Printf("Push user button to display the I2C slave device \n\r");
+
+
+ *     // Loop forever
+ *     while (true) {
+ *         murasaki::platform.sync_with_button->Wait();
+ *         I2cSearch(murasaki::platform.i2c_master);
+
+ *     }
+ * }
+ *  @endcode
+ *
+ * This function is the body of application. So, you can read GPIO, ADC other peripherals.
+ * And output to the DAC, GPIO, and other peripherals from here.
+ *
  */
 
 /**