Question

Hi,

Please can anyone help me to solve this question in ARM assembly language ASAP??

Thank you,

Task 4 On the Cornish, there is a pedestrian traffic light with a push button. Under normal condition, the green light is on for the cars to go, and the pedestrian light is red. When a pedestrian wants to cross, he/she presses on the push button and the red light turns on for the cars and green for pedestrian. Design this traffic light controller No request Initial state Green Request Yellow Red

Answer 1

#include lpc21xx.h
int main()
{
int i;
PINSEL0=0x00000000; //port 0 set to GPIO
IO0DIR=0x00000001; // 0th bit of port 0 will act as o/p for green light
IO1DIR=0x00000001; // 1st bit of port 0 will act as o/p for yellow light
IO2DIR=0x00000001; // 2nd bit of port 0 will act as o/p for red light

PINSEL2=0x00000000; //Port 1 as GPIO
IO1DIR=0x00000000;
while(1)
{
   if((0x00010000&IO1PIN)==0x00000000) //giving input at p1.16
   {
       IO1SET=0x00000001; // anode of led is connected to 0th bit of Port0
       for(i=0;i<100000;i++); //to create some delay(give delay of 1 ms)
       // adjust the value according to your oscilator frequency
       IO0SET=0x00000010; //turning yellow ON 1st pin of port 0
       for(i=0;i<100000;i++); //to create some delay (give delay of 1 sec)
       IO0CLR=0x00000010; //turning yellow off
       IO0SET=0x00000100; //turning red ON 2nd pin of port 0
       for(i=0;i<100000;i++); //give delay of 5 sec
       IO0CLR=0x00000100; //turning red off
      
   }
   else
   {
   IO1CLR=0x00000001;
   }
  
      
}