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[SOLVED] ATMega32 and 16*2 LCD

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yviswanathbe

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Hi,

I am doing LCD interfacing with AtMega32 Micro controller.
Just for testing i am sending one character in the main function while loop.But the character is priniting at first row second column. Even if i give the command first row, first column also same is happening.

I have tried this in PROTEUS software,but the result is same.

I have attached PROTEUS file and the source code.

can some body suggest me where i am doing wrong.

Thanks and Regards,
Viswanath
 

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  • atmega32V1.rar
    15 KB · Views: 93

Here is the code:
Code: 
#include <mega32.h>
#include <delay.h>
#include<stdio.h>


typedef unsigned char bit_8;                      


/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                              LCD Port Configuration
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/

#define LCD_PORT    PORTD
#define rs          PORTB.0
#define rw          PORTB.1
#define en          PORTB.2
#define flag        PIND.7
#define led         PORTB.1
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          LCD Command MACROS
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/

#define LCD_CLEAR             0x01
#define RETURN_HOME           0X02 
#define DEC_CURSOR            0x04
#define INC_CURSOR            0x06
#define DISP_OFF_CUR_OFF      0x08
#define DISP_OFF_CUR_ON       0x0A
#define DISP_ON_CUR_OFF       0x0C
#define DISP_ON_CUR_BLINK     0x0E
#define SHIFT_CUR_LEFT        0x10
#define SHIFT_CUR_RIGHT       0x14
#define SHIFT_DISP_LEFT       0x18
#define SHIFT_DISP_RIGHT      0x1C

/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                    Function Prototypes
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/

void lcd_init(void);                    // Initialize LCD
void busy(void);                              // Check Busy
void wrt_cmd(bit_8);                    // Sending Command
void wrt_data(bit_8);                    // Sending single character
void wrt_string(bit_8 *);          // Sending String
void wrt_value(bit_8);                    // Sending 8-bit Decimal value
void cursorxy(bit_8,bit_8);          // Bringing Cursor to (X,Y) location X -> 1,2 and Y -> 1-16
unsigned char *flash buf="Hello";

void lcd_init(void)
{
      wrt_cmd(0x38);
      wrt_cmd(0x06);
      wrt_cmd(0x08);
      wrt_cmd(0x01);
      wrt_cmd(0x0F);
      wrt_cmd(0x02);  
}

/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
**** Cheacking the busy flag of LCD
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/

void busy()
{
         // delay_ms(1000);
          //flag=1;
          PORTD=0x00;
          DDRD=0x00;
          rs=0;
          rw=1;
          led=1;
          while(flag!=0)
          {
                    en=0;
                    delay_ms(2);
                    en=1;
          }
          led=0;
          PORTD=0xFF;
          DDRD=0xFF;
}

/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          Writing command to LCD 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/

void wrt_cmd(bit_8 val)
{        
          busy();
          LCD_PORT=val;
          rs=0;
          rw=0;
          en=1;
          delay_ms(2);
          en=0;
}

/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          Writing string to LCD
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/

void wrt_string(char *string)
{
          busy();
          while(*string)
                    wrt_data(*string++);
}

/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          Writing data to LCD
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/

void wrt_data(bit_8 ch)
{
          busy();
          LCD_PORT = ch;
          rs=1;
          rw=0;
          en=1;
          delay_ms(2);
          en=0;
}

/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          Writing 8-bit Value to LCD
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/

void wrt_value(bit_8 x)
{
          bit_8 temp;
          temp = x/0x10;
          if(temp>9)
                    return;
          else
                    wrt_data(temp+0x30);
          temp = x%0x10;
          if(temp>9)
                    return;
          else
                    wrt_data(temp+0x30);
}

/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          Bringing Cursor to (X,Y) location of LCD
                    X -> 1,2
                    Y -> 1,16
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/

void cursorxy(bit_8 x, bit_8 y)
{
          if((x<1||x>2)&&(y<1||y>16))
          {
                    x=1;
                    y=1;
          }
          if(x == 1)
                    wrt_cmd(0x7F+y);
          else
                    wrt_cmd(0xBF+y);
}

void main()
{         
          
          PORTB=0x00;
          DDRB=0x07;
          //PORTD=0x00;
          //DDRD=0x00;
          delay_ms(20); 
          lcd_init();
            
               
          while(1)
          {
          delay_ms(1000);
          cursorxy(1,1);
          //wrt_cmd(0x80);              
          //delay_ms(100);
          //buf="Hello";
          //wrt_string(buf);
          //delay_ms(100);
          //wrt_cmd(0xC0);
          //delay_ms(100);
          wrt_data('A');
          //delay_ms(100);
          delay_ms(1000);
          }
}

Problem is, when you were defining RS, RW, etc, you defined RS as PORTB.0 but you also define led as PORTB.0 . So, when you are checking if the LCD is busy or not, you sent signals to RS. I changed LED to PORTB.1 and it's okay now.

Hope this helps.
Tahmid.
 

Hi Tahmid,

Thanks you very much.

Its working now.

Thanks and Regards,
Viswanath

---------- Post added at 10:55 ---------- Previous post was at 10:45 ----------


HI Tahmid,

One more question.

I am facing problem with write string function.

/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Writing string to LCD
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/

void wrt_string(char *string)
{
busy();
while(*string)
wrt_data(*string++);
}

if i give wrt_string("HELLO"); in the main loop i am getting the following error
"function argument #1 of type 'flash unsigned char * *' is incompatible with required parameter of type 'bit_8 *'"

and is working only when i declare a variable as unsigned char *flash buf="Hello"; and passing this parameter in to the wrt_string function.

what could be the reason for compilation error? (I am using codevision avr.)

Regards,
Viswanath
 

Hi,
I think you wrote
Code: 
wrt_string('HELLO');
This shows error.

But if I write
Code: 
wrt_string("HELLO");
This is fine and does not show any error.

I used this and it simulates fine.
Code: 
#include <mega32.h>
#include <delay.h>
#include<stdio.h>


typedef unsigned char bit_8;                      


/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                              LCD Port Configuration
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/

#define LCD_PORT    PORTD
#define rs          PORTB.0
#define rw          PORTB.1
#define en          PORTB.2
#define flag        PIND.7
#define led         PORTB.1
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          LCD Command MACROS
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/

#define LCD_CLEAR             0x01
#define RETURN_HOME           0X02 
#define DEC_CURSOR            0x04
#define INC_CURSOR            0x06
#define DISP_OFF_CUR_OFF      0x08
#define DISP_OFF_CUR_ON       0x0A
#define DISP_ON_CUR_OFF       0x0C
#define DISP_ON_CUR_BLINK     0x0E
#define SHIFT_CUR_LEFT        0x10
#define SHIFT_CUR_RIGHT       0x14
#define SHIFT_DISP_LEFT       0x18
#define SHIFT_DISP_RIGHT      0x1C

/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                    Function Prototypes
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/

void lcd_init(void);                    // Initialize LCD
void busy(void);                              // Check Busy
void wrt_cmd(bit_8);                    // Sending Command
void wrt_data(bit_8);                    // Sending single character
void wrt_string(bit_8 *);          // Sending String
void wrt_value(bit_8);                    // Sending 8-bit Decimal value
void cursorxy(bit_8,bit_8);          // Bringing Cursor to (X,Y) location X -> 1,2 and Y -> 1-16
unsigned char *flash buf="Hello";

void lcd_init(void)
{
      wrt_cmd(0x38);
      wrt_cmd(0x06);
      wrt_cmd(0x08);
      wrt_cmd(0x01);
      wrt_cmd(0x0F);
      wrt_cmd(0x02);  
}

/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
**** Cheacking the busy flag of LCD
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/

void busy()
{
         // delay_ms(1000);
          //flag=1;
          PORTD=0x00;
          DDRD=0x00;
          rs=0;
          rw=1;
          led=1;
          while(flag!=0)
          {
                    en=0;
                    delay_ms(2);
                    en=1;
          }
          led=0;
          PORTD=0xFF;
          DDRD=0xFF;
}

/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          Writing command to LCD 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/

void wrt_cmd(bit_8 val)
{        
          busy();
          LCD_PORT=val;
          rs=0;
          rw=0;
          en=1;
          delay_ms(2);
          en=0;
}

/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          Writing string to LCD
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/

void wrt_string(char *string)
{
          busy();
          while(*string)
                    wrt_data(*string++);
}

/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          Writing data to LCD
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/

void wrt_data(bit_8 ch)
{
          busy();
          LCD_PORT = ch;
          rs=1;
          rw=0;
          en=1;
          delay_ms(2);
          en=0;
}

/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          Writing 8-bit Value to LCD
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/

void wrt_value(bit_8 x)
{
          bit_8 temp;
          temp = x/0x10;
          if(temp>9)
                    return;
          else
                    wrt_data(temp+0x30);
          temp = x%0x10;
          if(temp>9)
                    return;
          else
                    wrt_data(temp+0x30);
}

/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          Bringing Cursor to (X,Y) location of LCD
                    X -> 1,2
                    Y -> 1,16
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/

void cursorxy(bit_8 x, bit_8 y)
{
          if((x<1||x>2)&&(y<1||y>16))
          {
                    x=1;
                    y=1;
          }
          if(x == 1)
                    wrt_cmd(0x7F+y);
          else
                    wrt_cmd(0xBF+y);
}

void main()
{         
          
          PORTB=0x00;
          DDRB=0x07;
          //PORTD=0x00;
          //DDRD=0x00;
          delay_ms(20); 
          lcd_init();
            
               
          while(1)
          {
          delay_ms(1000);
          cursorxy(1,1);
          //wrt_cmd(0x80);              
          //delay_ms(100);
          //buf="Hello";
          //wrt_string(buf);
          //delay_ms(100);
          //wrt_cmd(0xC0);
          //delay_ms(100);
          wrt_data('A');   
          cursorxy(1,3);
          //delay_ms(100);
          wrt_string("HELLO");
          delay_ms(1000);
          }
}

Hope this helps.
Tahmid.
 
Hi Tahmid,

I did same as you did.
I am still getting the error.

Which version are you using?
I am using Code Vision AVR 2.03.

is the problem with my code vision avr?

Thanks and Regards,
Viswanath

---------- Post added at 11:41 ---------- Previous post was at 11:35 ----------

Hi Tahmid,

Now it is working fine.

I have uninstalled and re installed the software.

Thanks for your time.

Regards,
Viswanath
 

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