All digital pins of the device can be used as general-purpose input/output
(GPIO). GPIOs can be used for various purposes. The GPIO module on the CC3200
consists of four GPIO blocks:
* GPIO A0
* GPIO A1
* GPIO A2
* GPIO A3
Each GPIO block provides eight GPIOs. The GPIO module supports 30 programmable
GPIO pins, depending on the peripheral used.
## Application details
The objective of this application is to showcase GPIO control using Driverlib
API calls. The LEDs connected to the GPIOs on the LaunchPad are used to
indicate GPIO output. The GPIOs are driven high and low periodically in order
to turn the LEDs on and off.
## Source Files briefly explained
* **main.c**: Contains the core logic to drive GPIOs and inturn blink the LEDs.
* **gpio\_if.c**: Contains the Driverlib API calls to drive the GPIOs
* **pinmux.c**: Generated by the PinMUX utility. GPIO pins are brought out on
the device boundry using the Driverlib Pinmux API calls.
* **startup\_\*.c** - Initialize vector table and IDE related functions
## Usage
1. Run the reference application.
* Open the project in CCS/IAR. Build the application and debug to load to the device, or flash the binary using [UniFlash](http://processors.wiki.ti.com/index.php/CC3100_%26_CC3200_UniFlash_Quick_Start_Guide).
2. Verify the LaunchPad LEDs (D5, D6 and D7) toggle on and off.
