====== HW 04 - Readings and visualization on the embedded platform ======

  * Use the template project as it is described in: [[courses:be5b99cpl:labs:lab08]].
  * Finalize the code which allows to process the commands as described in:
[[courses:be5b99cpl:labs:lab09]].
  * Write the code which will send information about joystick actions. 

===== Joystic =====
The joystick is an asynchronous device which depends on actions provided by the user. Every action on the joystick will result in a datagram to be sent over serial line. The datagram will look lile
<code>
EVENT:JOY X
</code>
Where X means the action which was performend. It is a decimal number representing events described in 
[[courses:be5b99cpl:labs:lab08]] such as: JOY_SEL, JOY_DOWN, JOY_LEFT, JOY_RIGHT, JOY_UP.

The applicaton ([[courses:be5b99cpl:labs:lab08]]) will wait for this datagram when stopped by **#wait_for_joystick** directive. The X will be parsed and used for the flow control operation.


These parameters of the program will be evaluated:

  * 1 point - student is able to compile and upload the program with example of the display controls to the Nucleo board.
  * 1 point - the Nucleo program will generate string which will be sent out of the Nucleo board based on joystick events - see the description above. 
  * 2 points - the PC application is capable to receive the data sent by Nucleo
  * 1 point - the Nucleo program will be capable to receive the data from PC and store these data into a buffer. 
  * 2 points - the PC program will send the "DRAW:CIRCLE 64,80,30" command and the PC application will allow for parameter change.
  * 2 points - the Nucleo will draw the circle on the display based on the command received from PC application.
  * 1 point - the PC application is capable to open a file which is given as a parameter on a command line and the name can be entered from the menu. The program will write the content of the text file on the screen - the example of the text file is given in Lab12 description.