Blinky

/* 

Toggling LEDs using special function registers by their names defined in the TivaWare header file

Runs on TI EK-TM4C123GXl LaunchPad Board

*/

#include <stdint.h>

#include "inc/tm4c123gh6pm.h"

void delayMs(int n);

int main(void)

{

    SYSCTL_RCGC2_R |= 0x00000020;     /* enable clock to GPIOF at clock gating control register */

    GPIO_PORTF_DIR_R = 0x0E;          /* enable the GPIO pins for the LED (PF3, 2, 1) as output */

    GPIO_PORTF_DEN_R = 0x0E;         /* enable the GPIO pins for digital function */

    while(1) {

        GPIO_PORTF_DATA_R = 0x0E;     /* turn on all LEDs */

        delayMs(500);

        GPIO_PORTF_DATA_R = 0;        /* turn off all LEDs */

        delayMs(500);

    }

}

/* delay n milliseconds (16 MHz CPU clock) */

void delayMs(int n)

{

    int i, j;

    for(i = 0 ; i < n; i++)

        for(j = 0; j < 3180; j++) {}   /* do nothing for 1 ms */

}

See Also

1. TM4C123GH6PM GPIO Programming
2. EK-TM4C123GXL LaunchPad Board
3. Switch Inputs and LED Outputs in TM4C123