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+/*

+ * This project contains an application demonstrating the use of the 

+ * FreeRTOS.org mini real time scheduler on the Luminary Micro LM3S811 Eval

+ * board.  See http://www.FreeRTOS.org for more information.

+ *

+ * main() simply sets up the hardware, creates all the demo application tasks, 

+ * then starts the scheduler.  http://www.freertos.org/a00102.html provides

+ * more information on the standard demo tasks. 

+ *

+ * In addition to a subset of the standard demo application tasks, main.c also

+ * defines the following tasks: 

+ *

+ * + A 'Print' task.  The print task is the only task permitted to access the

+ * LCD - thus ensuring mutual exclusion and consistent access to the resource.

+ * Other tasks do not access the LCD directly, but instead send the text they

+ * wish to display to the print task.  The print task spends most of its time

+ * blocked - only waking when a message is queued for display.

+ *

+ * + A 'Button handler' task.  The eval board contains a user push button that

+ * is configured to generate interrupts.  The interrupt handler uses a 

+ * semaphore to wake the button handler task - demonstrating how the priority 

+ * mechanism can be used to defer interrupt processing to the task level.  The

+ * button handler task sends a message both to the LCD (via the print task) and

+ * the UART where it can be viewed using a dumb terminal (via the UART to USB

+ * converter on the eval board).  NOTES:  The dumb terminal must be closed in 

+ * order to reflash the microcontroller.  A very basic interrupt driven UART

+ * driver is used that does not use the FIFO.  19200 baud is used.

+ *

+ * + A 'check' task.  The check task only executes every five seconds but has a

+ * high priority so is guaranteed to get processor time.  Its function is to

+ * check that all the other tasks are still operational and that no errors have

+ * been detected at any time.  If no errors have every been detected 'PASS' is

+ * written to the display (via the print task) - if an error has ever been

+ * detected the message is changed to 'FAIL'.  The position of the message is

+ * changed for each write.

+ */
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