HOW TO SET UP COMPARATOR INTERRUPT:

1. GPIO Pins
    > GPIO_DEN = 0x0000000F
    > GPIO_AMSEL = 0x00000080

2. Comparator setup (you can do this part)



-=-=-=-=-=-=-=-=-=-=- FIRST TASK: RECREATE SYSCONFIG LED FLASH -=-=-=-=-=-=-=-=-=-=-=-=-=-
1. Setup SysTick peripheral (IDENTICAL to ST version)
2. Setup LED (VERY SIMILAR to ST version)
3. Go
