Introduction: Tiva C Projects: Control Blinking RGB LED by Switch

By LinkedIn Porfile
About: Embedded Systems

How to control blinking RGB LED by switch

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

Step 1: Watch the Video

Step 2: How to Use GPIO Pins

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

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

Step 3: Let`s Write a Code

#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

}

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