[SOLVED] Rotary Encoder Interfacing with PIC18F27j53 Micro-Controller??

xpress_embedo · Feb 25, 2013

Hello!! Everyone i am using this rotary encoder

https://in.element14.com/bourns/3315c-001-016l/encoder-16cycles/dp/9354026?Ntt=9354026

But it is not working properly
I am using PIC18F27j53 Micro-Controller

My RC6 pin is connected to Channel A and RC7 to Channel-B

Here is my Code, please help me what to do

Code C - [expand]
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/*
Programmer :- Arun Sharma
 
Audio Controller Firmware for PIC18F27j53 Micro-Controller
 
Firmware Version -> v0.0
This version includes basic start up of project from roots.
First phase of development process
*/
#include <p18F27J53.h>
#include <delays.h>
 
/******************CONFIGURATION BITS****************/
#pragma config WDTEN = OFF          //WDT disabled (enabled by SWDTEN bit)
#pragma config PLLDIV = 5           //Divide by 5 (20 MHz oscillator input)
#pragma config STVREN = ON          //stack overflow/underflow reset enabled
#pragma config XINST = OFF          //Extended instruction set disabled
#pragma config CPUDIV = OSC1        //No CPU system clock divide
#pragma config CP0 = OFF            //Program memory is not code-protected
#pragma config OSC = HSPLL          //HS oscillator, PLL enabled, HSPLL used by USB
#pragma config FCMEN = OFF          //Fail-Safe Clock Monitor disabled
#pragma config IESO = OFF           //Two-Speed Start-up disabled
#pragma config WDTPS = 32768        //1:32768
#pragma config DSWDTOSC = INTOSCREF //DSWDT uses INTOSC/INTRC as clock
#pragma config RTCOSC = T1OSCREF    //RTCC uses T1OSC/T1CKI as clock
#pragma config DSBOREN = OFF        //Zero-Power BOR disabled in Deep Sleep
#pragma config DSWDTEN = OFF        //Disabled
#pragma config DSWDTPS = 8192       //1:8,192 (8.5 seconds)
#pragma config IOL1WAY = OFF        //IOLOCK bit can be set and cleared
#pragma config MSSP7B_EN = MSK7     //7 Bit address masking
#pragma config WPFP = PAGE_1        //Write Protect Program Flash Page 0
#pragma config WPEND = PAGE_0       //Start protection at page 0
#pragma config WPCFG = OFF          //Write/Erase last page protect Disabled
#pragma config WPDIS = OFF          //WPFP[5:0], WPEND, and WPCFG bits ignored
#pragma config CFGPLLEN = OFF
/****************************************************/
 
 
/****************PIN DETAILS****************/
#define LCD_RS  LATAbits.LATA2
#define LCD_EN  LATAbits.LATA3
#define LCD_DATA LATB
#define LCD_CLEAR 0x01
#define LCD_CURSOR_OFF 0x06
#define FIRST_ROW 0x80
#define SECOND_ROW 0xC0
#define ENCODER_A PORTCbits.RC6
#define ENCODER_B PORTCbits.RC7
/********************************************/
 
 
/******************Function Prototypes*****************/
void Delay_ms(unsigned int time);
void Lcd4_Init(void);
void Lcd4_Cmd(unsigned char value);
void Lcd4_Write(unsigned char value);
void Lcd4_Write_Text(unsigned char msg[]);
unsigned char * CopyConstToRAM(unsigned char *dest, const rom unsigned char * src);
void Clear_Destination_Buffer(void);
void HIGH_ISR(void);
void LOW_ISR(void);
/***********************************************/
 
const rom unsigned char text[] = "ESSEL SHYAM!";
const rom unsigned char love[] = "PIC";
unsigned char ram_msg[16];
unsigned char character[] = {0,10,21,17,17,10,4,0};
 
unsigned int count = 0;
unsigned char flag = 0;
unsigned char time_A = 0, time_B = 0;
/******************ISR CODE*********************/
#pragma code high_vector = 0x08
void interrupt_at_high_vector(void)
{
    _asm
        GOTO HIGH_ISR
    _endasm
}
#pragma code
 
#pragma interrupt HIGH_ISR
void HIGH_ISR(void)
{
    if(INTCON3bits.INT1E & INTCON3bits.INT1IF)
    {
        if(ENCODER_B == 1)
        {
            if(count <= 999)
                count++;
                flag = 1;
        }
        else if(ENCODER_B == 0)
        {
            if(count > 0)
                count--;
                flag = 1;
        }
        //while(ENCODER_A == 0);    //Stay Here
        INTCON3bits.INT1F = 0;
    }
}
 
void main()
{
    unsigned char i;
    unsigned char ones,tens,hundreds;
    unsigned int temp;
    
    EECON2 = 0x55;
    EECON2 = 0xAA;
    PPSCONbits.IOLOCK = 0;      //Allow Remapping
    
    RPINR1 = 0x11;             //RP17 as External_Interrupt Pin
        
    EECON2 = 0x55;
    EECON2 = 0xAA;
    PPSCONbits.IOLOCK = 1;    
    
    
    Lcd4_Init();
    Lcd4_Cmd(LCD_CLEAR);
    Lcd4_Cmd(LCD_CURSOR_OFF);
    Lcd4_Cmd(LCD_CLEAR);
    CopyConstToRAM(ram_msg,text);
    Lcd4_Write_Text(ram_msg);
    Delay_ms(10);
    
    //Store Heart in CGRAM of LCD
    Lcd4_Cmd(64);
    for (i=0;i<=7;i++)
    {
        Lcd4_Write(character[i]);
    }
    
    Lcd4_Cmd(SECOND_ROW);
    Lcd4_Write('I');
    Lcd4_Write(' ');    
    Lcd4_Write(0);      //Custom Character
    Lcd4_Write(' ');
    CopyConstToRAM(ram_msg,love);
    Lcd4_Write_Text(ram_msg);
    
    TRISCbits.TRISC6 = 1;       //Rotary Encoder_A as Input
    TRISCbits.TRISC7 = 1;       //Rotary Encoder_B as Input
    
    //Enable Interrupts
    INTCON3bits.INT1E = 1;
    INTCON3bits.INT1IP = 1;     //High Priority
    INTCON2bits.INTEDG1 = 0;    //Interrupt on Falling Edge
    INTCON3bits.INT1F = 0;    
    INTCONbits.PEIE = 1;
    INTCONbits.GIE = 1;
    INTCON3bits.INT1F = 0;
    while(1)
    {
        if(flag != 0)
        {
            Lcd4_Cmd(LCD_CLEAR);
            
            temp = count;
            
            ones = temp%10;
            temp = temp/10;
            tens = temp%10;
            temp = temp/10;
            hundreds = temp%10;
            
            Lcd4_Write(hundreds | 0x30);
            Lcd4_Write(tens | 0x30);
            Lcd4_Write(ones | 0x30);
                        
            flag = 0;
        }
    }
}
 
/**************Function Definitions*************/
void Delay_ms(unsigned int time)
{
    unsigned int first;
    unsigned int second;
    for(first=0;first<time;first++)
    {
        for(second=0;second<650;second++)
        {
            Delay1TCY();
        }
    }
}
void Lcd4_Cmd(unsigned char value)
{
    LCD_RS = 0;
    LCD_DATA = ((value>>4) & 0x0F);
    LCD_EN = 1;
    Delay_ms(1);
    LCD_EN = 0;
    LCD_DATA = (value & 0x0F);
    LCD_EN = 1;
    Delay_ms(1);
    LCD_EN = 0;
    Delay_ms(1);
}
void Lcd4_Write(unsigned char value)
{
    LCD_RS = 1;
    LCD_DATA = ((value>>4) & 0x0F);
    LCD_EN = 1;
    Delay_ms(1);
    LCD_EN = 0;
    LCD_DATA = (value & 0x0F);
    LCD_EN = 1;
    Delay_ms(1);
    LCD_EN = 0;
    Delay_ms(1);
}
 
void Lcd4_Write_Text(unsigned char msg[])
{
    while(*msg)
    {
        Lcd4_Write(*msg);
        msg++;
    }
}
 
void Lcd4_Init(void)
{
    TRISB = 0x00;
    TRISAbits.TRISA2 = 0;
    TRISAbits.TRISA3 = 0;
        
    LCD_RS = 0;     //Command Register
    LCD_EN = 0;
    
    LCD_DATA = 0x03;
    
    LCD_EN = 1;
    Delay_ms(1);
    LCD_EN = 0;
    Delay_ms(1);
    
    LCD_EN = 1;
    Delay_ms(1);
    LCD_EN = 0;
    Delay_ms(1);
    
    LCD_EN = 1;
    Delay_ms(1);
    LCD_EN = 0;
    Delay_ms(1);
    
    Delay_ms(1);
    LCD_DATA = 0x02;    // Four bit mode
    LCD_EN = 1;
    Delay_ms(1);
    LCD_EN = 0;
    Delay_ms(1);   
    
    Lcd4_Cmd(0x28);
    Lcd4_Cmd(0x0C);
    Lcd4_Cmd(0x01);
    Lcd4_Cmd(0x06);
}
unsigned char * CopyConstToRAM(unsigned char *dest, const rom unsigned char * src)
{
    Clear_Destination_Buffer();
    for(;*dest++ = *src++;)
        ;
    return dest;
}
void Clear_Destination_Buffer()
{
    unsigned char i;
    for(i=0;i<16;i++)
    {
        ram_msg[i] = 0;
    }
}
/***********************************************/

On oscilloscope pulses are perfect,
Both lines are pulled up by 10k resistor

Please help.
Waiting for reply

xpress_embedo · Feb 25, 2013

Can any one help me please???

jayanth.devarayanadurga · Mar 30, 2013

What do you mean by not working properly. If you explain what is the actual problem then we can try to solve it.

xpress_embedo · Mar 30, 2013

Thanks for your reply.
Actually i am not able to sense the pulses of rotary encode.

upand_at_them · Mar 30, 2013

To develop better debugging skills, start with a simpler program. Get rid of the RAM writing stuff and get rid of the LCD stuff. You want the program down to the simplest form where it works or does not work.

Then connect an LED to one pin, turn it off in your initialize routine, and turn it on in your interrupt routine. This will tell you if your interrupts are working. Once this works you can add in the additional things one and a time.

abidr · Apr 1, 2013

It's a 2 bit quadrature code,output encoder

I used to have a working code for this type of encoder but it was for PIC16F87xA series, if you are interested I 'll post the code once I get back home.

You could modify it for 18F series, but do understand it will be useful only if you understand pic interrupts and make the transition from16F to 18F

xpress_embedo · Apr 1, 2013

I had solved my problm.
And i use timer for this

[SOLVED] Rotary Encoder Interfacing with PIC18F27j53 Micro-Controller??

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