Tiva C Projects: Control Blinking RGB LED by Switch

How to control blinking RGB LED by switch

In this instructable, we will combine this instructable with this one.

To use GPIO pin as an output pin, look at this instructable

To use GPIO pin as an input pin, look at this instructable

#define SYSCTL_RCGCGPIO_R (*((volatile int *) 0x400FE608))

#define GPIO_PORTF_DIR_R (*((volatile int *) 0x40025400))

#define GPIO_PORTF_DEN_R (*((volatile int *) 0x4002551C))

#define GPIO_PORTF_DATA_R (*((volatile int *) 0x4002507C))

#define GPIO_PORTF_PUR_R (*((volatile int *) 0x40025510))

#define GPIO_PORTF_LOCK_R (*((volatile int *) 0x40025520))

#define GPIO_PORTF_CR_R (*((volatile int *) 0x40025524))

#define GPIO_PORTF_CLK_EN 0x20 //clock enable of PORTF

#define GPIO_PORTF_PIN0_EN 0x01 //Enable SW2

#define GPIO_PORTF_PIN1_EN 0x02 //Enable RED LED

#define GPIO_PORTF_PIN2_EN 0x04 //Enable BLUE LED

#define GPIO_PORTF_PIN3_EN 0x08 //Enable GREEN LED

#define GPIO_PORTF_PIN4_EN 0x10 //Enable SW1

void PORTF_Init(void);

void Delay(unsigned int);

int main(void)

{

unsigned char flag = 0;

unsigned int SW1,SW2;

PORTF_Init();

while(1)

{

SW1 = GPIO_PORTF_DATA_R & 0x10;

SW2 = GPIO_PORTF_DATA_R & 0x01;

if(!SW1 && SW2) //if SW1 is pressed and SW2 is not

{

flag = 1;

}

else if(SW1 &&!SW2) //if SW2 is pressed and SW1 is not

{

flag = 2;

}

if(flag == 1)

{

GPIO_PORTF_DATA_R = 0x02; //Turn on RED LED

Delay(50); //Delay 50 msec

GPIO_PORTF_DATA_R = 0x04; //Turn on BLUE LED

Delay(50); //Delay 50 msec

GPIO_PORTF_DATA_R = 0x08; //Turn on GREEN LED

Delay(50); //Delay 50 msec

}

else

{

GPIO_PORTF_DATA_R = 0x00; //Turn off RGB LED

}

}

}

//Delay Function (pass number in msec)

void Delay(unsigned int counter)

{

volatile unsigned int i; //volatile keyword is very important for blinking LED correctly

counter *= 4000;

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

}

void PORTF_Init(void)

{

SYSCTL_RCGCGPIO_R |= GPIO_PORTF_CLK_EN; //enable clock of PORTF

GPIO_PORTF_LOCK_R = 0x4C4F434B; //unlock GPIO of PORTF

GPIO_PORTF_CR_R = 0x01; //Enable GPIOPUR register enable to commit

GPIO_PORTF_PUR_R |= GPIO_PORTF_PIN0_EN + GPIO_PORTF_PIN4_EN; //Enable Pull Up SW1,SW2 GPIO_PORTF_DIR_R |= GPIO_PORTF_PIN1_EN + GPIO_PORTF_PIN2_EN + GPIO_PORTF_PIN3_EN; //Make PF1,PF2,PF3 as output and PF4 as input by default

GPIO_PORTF_DEN_R |= GPIO_PORTF_PIN0_EN + GPIO_PORTF_PIN1_EN + GPIO_PORTF_PIN2_EN+ GPIO_PORTF_PIN3_EN + GPIO_PORTF_PIN4_EN; //enable PF1,PF2,PF3,PF4 pins as digital GPIO

}