exercise_3_notes.txt

1.Modify the existing polling code in Keypad::Init and 
Keypad::read_data to include the necessary interrupt code. 
You’ll be using the SetPinIrq and DisableIrq functions for this. 

keyboard can poll keys correctly yay


2.Complete the Keypad::KeyPadISR1to include the code that handles
 the keypad presses and transmits that info into the appropriate task. 


3.You should see each button press represent a different character
 or string on the keypad. The provided mapping is given in keypad.cpp. 
Change the map to get unique outputs for each of the sixteen keys. 
Use the serial console to display the value that each button maps to. 


4.Once your interrupts are working correctly, you must pass the 
value read from the keypad encoder to the UserMain runtime loop 
or to a new task created for the purpose. Using a queue to pass 
the keypad values is the recommended way. 
Consult the uC documentation on how to use queues. 
How you choose to pass this information via the queue is a 
design decision on your part.