====== Lab03 - Nucleo Echo ======
 
  * Find the appropriate device (serial line) to receive data - use ''cat'' command to receive the data and ''echo'' for sending data.
  * Write a program that will open the communication device and print the data sent from Nucleo.
  * Get a good grasp of blocking and non-blocking functions.
  * Get familiar with HomeWork 02.

===== Instructions =====
  * Download the files of this lab from {{ :courses:be5b99cpl:labs:ide_usart_2.zip |}}.
  * Compile the code and upload it to the board according to Lab02.
  * Open a terminal and write the code below to get data from board.

<code>
stty -F /dev/ttyACM0 -brkint -icrnl -imaxbel -opost -onlcr -isig -icanon -iexten -echo -echoe -echoctl -echoke 115200
cat /dev/ttyACM0 
</code>

If you face any problem in this stage inform lab instructors.

  * In another terminal write code
<code>
echo led1 >/dev/ttyACM0
</code>

After this command, green led on your board should turn on. If you send the code below,

<code>
echo led0 >/dev/ttyACM0
</code>

green led should be off.

  * This way, a communication bridge between board and PC is built. Check ''main.c'' file to find out how this bridge was built.


===== Lab Tasks =====
Modify main.c in a way that
  * Switch the logic of led0 and led1, in a way that led0 turns on the green led and led1 turns it off.
  * When board starts to work, make it print your name.
  * when command ''name'' is given to board, make it print your name.
  * Avoid board from printing repetitive strings until the input is changed.
  * define a command ''ledb'' which blinks led with a frequency of 20 Hz. In order to do this, you should decrease the waiting time of the receiver function to 10 ms.