Applications of Embe ...

#include <main.h> // the file main.h with the

          // initial settings is included.

          // This file must be placed in the same

          // folder with the project.

          // Also the 18F4550.h file must exist

          // in the same folder with the project            

#byte PORTB =0xF81  

/* We attribute to the memory position 0xF81 the name PORTB. This means that we define an 8-bit variable whose value will be stored to the memory position F81h.*/                                                           

void init (void);                      

void timer0_int(void);        

//function for our delay

void mydelay_100us(int); 

int32 counter_time=0;                                                            

//Declare a variable to count the interrupts.

//It will increment by 1 every 100 µs

int32 counter_time_old=0;                                                 

int32 aaa=1;                                                                      

void main(){                            

   init();    

   while (TRUE){

      PORTB=PORTB^0b11111111;

      mydelay_100us(500); 

      //delay 500Χ100μs=50 000 μs= 50 ms

   }                             

}

//Interrupt Service Routine

#INT_TIMER0                     

void timer0_int(void) {

   set_timer0(64336);                                                         

   counter_time++;                                                             

}

void init (void) {      

   SETUP_TIMER_0(T0_INTERNAL | T0_DIV_1 );                                        

   set_timer0(64336);                                                         

   enable_interrupts(INT_TIMER0);                                           

   enable_interrupts(GLOBAL);                                              

   set_tris_b(0x00);         

   PORTB=0x00;                                                               

}

void mydelay_100us(aaa){

   counter_time_old=counter_time;                                                 

   while(counter_time < counter_time_old+aaa) {  }

}