// east facing red light connected to PB5 // east facing yellow light connected

ID: 3349235 • Letter: #

Question

// east facing red light connected to PB5

// east facing yellow light connected to PB4

// east facing green light connected to PB3

// north facing red light connected to PB2

// north facing yellow light connected to PB1

// north facing green light connected to PB0

// north facing car detector connected to PE1 (1=car present)

// east facing car detector connected to PE0 (1=car present)

#include "PLL.h"

#include "SysTick.h"

#define LIGHT (*((volatile unsigned long *)0x400050FC))

#define GPIO_PORTB_OUT (*((volatile unsigned long *)0x400050FC)) // bits 5-0

#define GPIO_PORTB_DIR_R (*((volatile unsigned long *)0x40005400))

#define GPIO_PORTB_AFSEL_R (*((volatile unsigned long *)0x40005420))

#define GPIO_PORTB_DEN_R (*((volatile unsigned long *)0x4000551C))

#define GPIO_PORTB_AMSEL_R (*((volatile unsigned long *)0x40005528))

#define GPIO_PORTB_PCTL_R (*((volatile unsigned long *)0x4000552C))

#define GPIO_PORTE_IN (*((volatile unsigned long *)0x4002400C)) // bits 1-0

#define SENSOR (*((volatile unsigned long *)0x4002400C))

#define GPIO_PORTE_DIR_R (*((volatile unsigned long *)0x40024400))

#define GPIO_PORTE_AFSEL_R (*((volatile unsigned long *)0x40024420))

#define GPIO_PORTE_DEN_R (*((volatile unsigned long *)0x4002451C))

#define GPIO_PORTE_AMSEL_R (*((volatile unsigned long *)0x40024528))

#define GPIO_PORTE_PCTL_R (*((volatile unsigned long *)0x4002452C))

#define SYSCTL_RCGC2_R (*((volatile unsigned long *)0x400FE108))

#define SYSCTL_RCGC2_GPIOE 0x00000010 // port E Clock Gating Control

#define SYSCTL_RCGC2_GPIOB 0x00000002 // port B Clock Gating Control

// Linked data structure

struct State {

unsigned long Out;

unsigned long Time;

unsigned long Next[4];};

typedef const struct State STyp;

#define goN 0

#define waitN 1

#define goE 2

#define waitE 3

STyp FSM[4]={

{0x21,3000,{goN,waitN,goN,waitN}},

{0x22, 500,{goE,goE,goE,goE}},

{0x0C,3000,{goE,goE,waitE,waitE}},

{0x14, 500,{goN,goN,goN,goN}}};

unsigned long S; // index to the current state

unsigned long Input;

int main(void){ volatile unsigned long delay;

PLL_Init(); // 80 MHz, Program 10.1

SysTick_Init(); // Program 10.2

SYSCTL_RCGC2_R |= 0x12; // 1) B E

delay = SYSCTL_RCGC2_R; // 2) no need to unlock

GPIO_PORTE_AMSEL_R &= ~0x03; // 3) disable analog function on PE1-0

GPIO_PORTE_PCTL_R &= ~0x000000FF; // 4) enable regular GPIO

GPIO_PORTE_DIR_R &= ~0x03; // 5) inputs on PE1-0

GPIO_PORTE_AFSEL_R &= ~0x03; // 6) regular function on PE1-0

GPIO_PORTE_DEN_R |= 0x03; // 7) enable digital on PE1-0

GPIO_PORTB_AMSEL_R &= ~0x3F; // 3) disable analog function on PB5-0

GPIO_PORTB_PCTL_R &= ~0x00FFFFFF; // 4) enable regular GPIO

GPIO_PORTB_DIR_R |= 0x3F; // 5) outputs on PB5-0

GPIO_PORTB_AFSEL_R &= ~0x3F; // 6) regular function on PB5-0

GPIO_PORTB_DEN_R |= 0x3F; // 7) enable digital on PB5-0

S = goN;

while(1){

LIGHT = FSM[S].Out; // set lights

SysTick_Wait10ms(FSM[S].Time);

Input = SENSOR; // read sensors

S = FSM[S].Next[Input];

}

how to do this traffic light code? thank you

as an FSM 2) The system starts with the LED on I 3) Wait about 62 ms 4) If the switch is pressed,then toggle the LED once, else turn the LED on. 5) Steps 3 and 4 are repeated over and over +3. 3V 3 V3 C1 u F U1e Booster Pack QIP SW3 NO switch R19 22% 1 2 74% PES R 1 10 k D1 LEDT1. 75 Re d GND PE1 27 PEO 18 7 40

Explanation / Answer

As we have to wait for 62ms in the code .So, to make it possible we have to change the delay function from 10ms to 62 ms.

I am also writing 1 code which i used in a project of mine where i used the delay fuction of 10 ms by using microcontroller. I use the LED and control them by triggering the pulse. So, plese check that code also. It must help you.

Code=

#include<reg52.h>

static int y;

sbit x=P3^3;

void msecdelay2();

void msecdelay5();

void main()

{

P1=0x0ff; // MAKE PORT1 AS INPUT & OUTPUT PORT

P2=0x00; // MAKE PORT2 AS OUTPUT PORT

x=1;

while(1)

{

if(P1==0x0fe) //if switch 1 is pressed

{

y=0;

while(P1=0x0f5)

{

if(y==0)

{

zcr(); //WAIT FOR ZERO CROSS REFERENCE

msecdelay2(); // DELAY FOR 2MSEC

P2=0x0f;

msecdelay5(); // DELAY FOR 5MSEC

P2=0x00;

y++; //increment y value

}

if(y==1)

{

zcr(); // WAIT FOR ZERO CROSS REFERENCE

msecdelay2(); // DELAY FOR 2MSEC

P2=0x0f;

msecdelay5(); // DELAY FOR 5MSEC

P2=0x00;

y++; //increment y value

}

if(y==2)

{

P2=0xf0;

msecdelay5(); // DELAY FOR 5MSEC

P2=0x00;

y++; //increment y value

}

if(y==3)

{

zcr(); // WAIT FOR ZERO CROSS REFERENCE

msecdelaY2(); // DELAY FOR 2MSEC

P2=0x0f0;

msecdelay5(); // DELAY FOR 5MSEC

P2=0x00;

y=0;

}

else if(P1=0xfc) //if switch2 is pressed

{

y=0;

while(P1==0xfa)

{

if(y==0)

{

zcr(); //WAIT FOR ZERO CROSS REFERENCE

msecdelay2(); // DELAY FOR 2MSEC

P2=0x0f;

msecdelay5(); // DELAY FOR 5MSEC

P2=0x00;

y++; //increment y value

}

if(y==1)

{

msecdelay2(); // DELAY FOR 2MSEC

P2=0x0f;

msecdelay5(); // DELAY FOR 5MSEC

P2=0x00;

y++; //increment y value

}

if(y==2)

{

zcr(); // WAIT FOR ZERO CROSS REFERENCE

msecdelay2(); // DELAY FOR 2MSEC

P2=0x0f;

msecdelay5(); // DELAY FOR 5MSEC

P2=0x00;

y++; //increment y value

}

if(y==3)

{

zcr(); // WAIT FOR ZERO CROSS REFERENCE

msecdelay2(); // DELAY FOR 2MSEC

P2=0xf0;

msecdelay5(); // DELAY FOR 5MSEC

P2=0x00;

y++ //increment y value

}

if(y==4)

{

zcr(); // WAIT FOR ZERO CROSS REFERENCE

msecdelay2(); // DELAY FOR 2MSEC

P2=0xf0;

msecdelay5(); // DELAY FOR 5MSEC

P2=0x00;

y++;

}

if(y==5)

{

zcr(); // WAIT FOR ZERO CROSS REFERENCE

P2=0xf0;

msecdelay5(); // DELAY FOR 5MSEC

P2=0x00;

y=0;

}

else

{

if(y==0)

{

zcr(); // WAIT FOR ZERO CROSS REFERENCE

msecdelay2(); DELAY FOR 2MSEC

P2=0x0f;

msecdelay5(); // DELAY FOR 5MSEC

P2=0x00;

y++; //increment y value

}

if(y==1)

{

zcr(); // WAIT FOR ZERO CROSS REFERENCE

msecdelaY2(); // DELAY FOR 2MSEC

P2=0xf0;

msecdelaY5(); // DELAY FOR 5MSEC

P2=0x00;

y=0;

}

void zcr(void) // ZERO CROSS REFERENCE FUNCTION

{

while(x==1);

while(x==0);

}

void msecdelay2()

{

unsigned int i,j;

for(i=0;i<1;i++)

{

for(j=0;j<50;j++)

{;}

}

void msecdelay5()

{

unsigned int m,n;

for(m=0;m<5;m++)

{

for(n=0;n<100;n++);

}

Given code by you=

/ east facing red light connected to PB5