/*
* 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.
*/
