Encoder with PIC MPLAB IDE (예제1)

Naver

 [pic portb change interrupt]

pic16 예제

[PIC INTERRUPT-ON-Change]

http://www.circuitvalley.com/2012/10/rotary-encoders-interfacing-pic18-avr.html

Rotary Encoder Interfacing with PIC Microcontroller

Rotary Encoder PIC18.zip

Source code 는 총 3개로 나뉘어 있다.

lcd16.h lcd16.c main.c

우선 봐야할 것은 lcd16.h이다.

이 안에있는 #include <p18F458.h>

#include <delays.h>역시 주목해야한다.

p18f458.h

delays.h

▼▼▼▼▼lcd16.h▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼

#ifndef __lcd16_h_

#define __lcd16_h_

#include <p18F458.h>

#define RS PORTCbits.RC3        //정의한다. RS를 포트C3로

#define EN PORTCbits.RC2        //정의한다. EN을 포트C2로

void numToLcd(unsigned char);                //lcd16.c안의 method참고

void gotoXy(unsigned char  ,unsigned char);    //

void lcdInit(void);

void lcdCmd(unsigned char);

void lcdData(unsigned char);

void lcdWriteNibble(unsigned char);

void waitLcd(unsigned char);

void prints(const rom char * message);

#endif

▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲

▼▼▼▼▼lcd16.c▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼

#include "lcd16.h"

void lcdCmd(unsigned char Data)    //4번 메소드

{

EN=0;

PORTD =((Data >> 4) & 0x0F);

RS=0; //because sending command

EN=1;

waitLcd(2);

EN=0;

PORTD  = (Data & 0x0F);

EN =1;

waitLcd(2);

EN=0;

}

void lcdData(unsigned char l)   //5번 메소드

{

EN=0;

PORTD =((l >> 4) & 0x0F);

RS=1;  //because sending data

EN=1;

waitLcd(2);

EN=0;

PORTD  = (l & 0x0F);

RS=1;  //because sending data

EN=1;

waitLcd(2);

EN=0;

}

void lcdInit(void)    //3번 메소드

{

RS=0;

EN=0;

PORTD= 0x3;

waitLcd(40);

EN=1;

EN=0;

waitLcd(5);

EN=1;

EN=0;

waitLcd(5);

EN=1;

EN=0;

waitLcd(2);

PORTD=2;

EN=1;

EN=0;

lcdCmd(0x28);   //set data length 4 bit 2 line

waitLcd(250); 

lcdCmd(0x0E);   // set display on cursor on blink on

waitLcd(250);

lcdCmd(0x01); // clear lcd 

waitLcd(250);

lcdCmd(0x06);  // cursor shift direction

waitLcd(250);

lcdCmd(0x80);  //set ram address

waitLcd(250);

}

void waitLcd(unsigned char x)

{

unsigned char i;

for (x ;x>1;x--)

{

for (i=0;i<=110;i++);

}

}

//gotoXy(column, row);

void gotoXy(unsigned char  x,unsigned char y)        //2번 메소드

{

     if(x<40)

     {

          if(y) x|=0b01000000;

          x|=0b10000000;

          lcdCmd(x);

      }

}

void prints(const rom char * message){ // Write message to LCD (C string type)

lcdCmd(0x8); // disable display;

while (*message){ // Look for end of string

lcdData(*message++);

}

lcdCmd(0xE); // enable display;

}

void clearLcd(void)

{

// Send command to LCD (0x01)

lcdCmd(0x01);

}

void numToLcd(unsigned char num)        //1번 메소드

{

lcdData((num/100)+0x30);

lcdData(((num/10)%10)+0x30);

lcdData((num%10)+0x30);

}

▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲

▼▼▼▼▼main.c▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼

/* 

 * File:   main.c

 * Author: Gaurav

 *

 * Created on September 2, 2013, 11:49 PM

 */

#pragma config OSC = HS, OSCS = OFF //configuration settings 

#pragma config PWRT= OFF , BOR=OFF, BORV = 27

#pragma config WDT = OFF

#pragma config LVP =OFF , STVR =OFF

#include <p18f458.h> 

#include "lcd16.h" //includes the lcd routines header file, 

//the rotary encoder is not dependent on this 

//but in this demo required to display.

#include <delays.h> //C18 compiler delay routine header file  

/*

 * 관련자료 링크

 *  Delay1KTCYx :: Delay multiples of 1000 Tcy

 *  Delay1TCY :: Nop()

 *  Delay10TCYx :: 2560 cycles

 *  Delay100TCYx :: 25600 cycles

 *  Delay1KTCYx :: 256000 cycles

 */

#define REA LATBbits.LATB4 // Rotary encoder pin definition

#define REB LATBbits.LATB5    //정의한다. REB를 래치 B 비트들중.래치B5 라고

//C18 Header에서 LATBbits에 대해 정의되있다.

//Hi-Tech에서는 다르게 정의한다.

void pbchange(void);

//portb change routine this routine is being called by the interrrupt serivice routine on portb change interrupts

void callISR(void);

#pragma code highPI = 0x008 // to put the code on Interrupt Vector 

void highPI(void)

{

_asm 

goto callISR

 _endasm

}

#pragma code 

#pragma interrupt callISR //checks which one of the interrupt is occured

void callISR(void)

{

 if(INTCONbits.RBIF==1) //check for PortB change interrupt

{

       pbchange(); //call the routine

}

}

unsigned char count; //this variable will incremented or decremented on encoder rotation

void main() {

   

TRISD = 0x00; // set the PORTD to output 

TRISC = 0x00; // set the PORTC to output

    TRISBbits.TRISB4=1; // set rotary encoder pins to input

TRISBbits.TRISB5=1;

lcdInit(); // inilized the LCD

prints("Count = ");  

numToLcd(count); // display count to lcd

INTCON2bits.RBPU  =0; // enable pullups 

INTCONbits.RBIF = 0; // clear the interrupt flag 

INTCONbits.RBIE = 1; // enable PORTB change interrupt

    INTCONbits.GIE  = 1; // enable the global interrupt

while(1)

{

}

}

void pbchange(void )

{

unsigned char state;

static unsigned char oldstate;  // this variable need to be static as it has to retain the value between calls 

Delay1KTCYx(5); // delay for 1ms here for debounce 

state= REB<<1 | REA; //  combine the pin status and assign to state variable 

if(oldstate==0x0){

if( state ==0x1)

{

count--; //decrement the count 

gotoXy(8,0); //goto proper position on the LCD screen

numToLcd(count); //display the count value on to LCD

}else if( state == 0x2)

{

count++; //decrement the count 

gotoXy(8,0); //goto proper position on the LCD screen

numToLcd(count); //display the count value on to LCD

}

}

oldstate = state; // store the current state value to oldstate value this value will be used in next call

PORTB = PORTB; // read or Any read or write of PORTB,This will end the mismatch condition

INTCONbits.RBIF = 0; // clear the porb change intrrupt flag 

}

▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲