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examples/lm4f/stellaris-ek-lm4f120xl/miniblink/README

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+README
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+
+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.
+
+