The main file is project1P2.c
- program ARM Cortex-M4 Launchpad
- build a DAC circuit
- play simple songs using a speaker
- 16 MHz system clock
- output to a speaker via PA3
- SysTick timer interrupt priority 2
- Port F edge interrupt priority 5
- Happy Birthday
- Mary Had a Little Lamb
- Twinkle Twinkle Little Star