debounce.c and answered questions.While you don’t need to turn in the code for this part, I still recommend you do it! The sample uses the TimerA1 module for PWM and the watchdog timer as a “tick” generator, which is probably a good framework.
Before implementing the full code for this lab, you should start by getting the sound aspect set up. Wire a piezo buzzer between to 2 PWM-capable pins. By connecting the device in this manner and enabling one or both channels, the volume of the sound can be changed. Write code that plays a standard 8-note octave scale (or different pattern if you choose) starting from middle C (see Wikipedia table). Each note should be played for 1 second. The scale should then repeat. Every other scale should be a higher volume. Sample code to get you going is in piezo_sample.c.
The point of this portion of the lab is to implement switch debouncing in software. The switches provided to you in class are reasonable, but still bounce noticeably.
Humans can control their fingers on timescales of hundreds of milliseconds. In the final portion of this lab, you will build a system which trains you to tap your fingers as fast as possible in a particular pattern. Wire two buttons on your breadboard to your MSP430. You will learn to press them in the pattern 1, 2, 1, 1, 2, 2. The system will mark your progress with an LED and a tone-playing buzzer. The LED should get progressively brighter and the tone progressively higher frequency as pattern is entered faster and faster. You should choose the values such that they are noticable and there are at least 8 levels. If pattern is entered incorrectly, LED and sound should go off. At any time, you should be able to reset the training by holding both buttons simultaneously for 2 s. Resetting should cause the LED to flash.
Save this code as debounce.c. Create a demo video that shows you playing and then resetting
and playing again. Upload your answered questions, code and the video URL to owlspace.
Bonus: Implement a system in which doing something (entering the reset pattern twice?) causes the system to enter a “programming” mode, in which the pattern can be changed.