------------------------------------------------------------------------------ README ------------------------------------------------------------------------------ This example demonstrates the following: * Configuriong GPIO pins * Toggling GPIO pins * Setting up and using GPIO interrupts * Unlocking protected GPIO pins * Controlling the system clock * Changing the system clock on the fly Flashes the Red, Green and Blue diodes on the board, in order. The system clock starts at 80MHz. Pressing SW2 toggles the system clock between 80MHz, 57MHz, 40MHz ,20MHz, and 16MHz by changing the PLL divisor. Pressing SW1 bypasses the PLL completely, and runs off the raw 16MHz clock provided by the external crystal oscillator. The LEDs will toggle at different speeds, depending on the system clock. The system clock changes are handled within the interrupt service routine.