Embedded labsheet 10

Labsheet10.txt

// LaunchPad built-in hardware
// SW1 left switch is negative logic PF4 on the Launchpad
// SW2 right switch is negative logic PF0 on the Launchpad
// red LED connected to PF1 on the Launchpad
// blue LED connected to PF2 on the Launchpad
// green LED connected to PF3 on the Launchpad

// 1. Pre-processor Directives Section
// Constant declarations to access port registers using 
// symbolic names instead of addresses
// TExaS.o is the object code for the real-board grader
#include "tm4c123gh6pm.h"
/*Actually below registers are referred in the header file
#define GPIO_PORTF_DATA_R       (*((volatile unsigned long *)0x400253FC))
#define GPIO_PORTF_DIR_R        (*((volatile unsigned long *)0x40025400))
#define GPIO_PORTF_AFSEL_R      (*((volatile unsigned long *)0x40025420))
#define GPIO_PORTF_PUR_R        (*((volatile unsigned long *)0x40025510))
#define GPIO_PORTF_DEN_R        (*((volatile unsigned long *)0x4002551C))
#define GPIO_PORTF_LOCK_R       (*((volatile unsigned long *)0x40025520))
#define GPIO_PORTF_CR_R         (*((volatile unsigned long *)0x40025524))
#define GPIO_PORTF_AMSEL_R      (*((volatile unsigned long *)0x40025528))
#define GPIO_PORTF_PCTL_R       (*((volatile unsigned long *)0x4002552C))
#define SYSCTL_RCGC2_R          (*((volatile unsigned long *)0x400FE108))
*/
// 2. Declarations Section
//   Global Variables
unsigned long SW1;  // input from PF4,PF0
unsigned long Out;      // outputs to PF3,PF2,PF1 (multicolor LED)

//   Function Prototypes
void PortE_Init(void);
void Delay(void);

// 3. Subroutines Section
// MAIN: Mandatory for a C Program to be executable
int main(void){    
  PortE_Init();        // Call initialization of port PF4, PF3, PF2, PF1, PF0    
  while(1){
    SW1 = GPIO_PORTE_DATA_R&0x01;     // read PE0 into SW1
     if((SW1)){                			// button1 is pressed
			GPIO_PORTE_DATA_R=~(GPIO_PORTE_DATA_R);
			Delay();
			GPIO_PORTE_DATA_R=~(GPIO_PORTE_DATA_R);
			Delay();

	}
		else{  
				GPIO_PORTE_DATA_R = 0x02;   // LED is red
		}
	}
}
// Subroutine to initialize port F pins for input and output
// PF4 and PF0 are input SW1 and SW2 respectively
// PF3,PF2,PF1 are outputs to the LED
// Inputs: None
// Outputs: None
// Notes: These five pins are connected to hardware on the LaunchPad
void PortE_Init(void){ volatile unsigned long d;
  SYSCTL_RCGC2_R |= 0x00000010;     // 1) E clock
  d = SYSCTL_RCGC2_R;                //Dummy instruction to wait for clock to stabilize  
  GPIO_PORTE_CR_R |= 0x03;           // allow changes to PE1-0       
  GPIO_PORTE_AMSEL_R &=~(0x03);        // 3) disable analog function
  GPIO_PORTE_PCTL_R &=~(0x03);   // 4) GPIO clear bit PCTL  
  GPIO_PORTE_DIR_R |= 0x02;          // 5) PE0 input, PE1 output   
  GPIO_PORTE_AFSEL_R = 0x00;        // 6) no alternate function       
  GPIO_PORTE_DEN_R |= 0x03;          // 7) enable digital pins PE1-PE0        
}


void Delay(void){
unsigned long volatile time;
time = 1000000; // counter value for delay
while(time){
time--;
}
}
// Color    LED(s) PortF
// dark     ---    0
// red      R--    0x02
// blue     --B    0x04
// green    -G-    0x08
// yellow   RG-    0x0A
// sky blue -GB    0x0C
// white    RGB    0x0E
// pink     R-B    0x06