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PIC16F628A and LCD driver

 
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glavic



Joined: 13 Jul 2005
Posts: 7

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PIC16F628A and LCD driver
PostPosted: Wed Jul 13, 2005 10:56 am     Reply with quote
I am writing my own LCD driver, because driver included in CCS inst alowing you to define each pin.

main.c
Code:
#include <16F628A.h>
#fuses NOWDT, PUT, NOPROTECT, BROWNOUT, NOMCLR, NOLVP, INTRC_IO, NOCPD
#use delay(clock=4000000)

#include <driver.lcd.c>


void main ()
{
   delay_ms(200);
   lcd_init();

   while (true)
   {
      
   }
}



driver.lcd.c
Code:
#define   LCD_rs   PIN_B1
#define   LCD_en   PIN_B0

#define   LCD_d4   PIN_B4
#define   LCD_d5   PIN_B5
#define   LCD_d6   PIN_B6
#define   LCD_d7   PIN_B7

BYTE const LCD_INIT_STRING[5] =
{
   0x28,   // function set         [2 lines, 5x10 dots]
   0x10,   // cursor or display shift   [cursor move=off, shift to the left]
   0x0C,   // display on/off control   [display=on, cursor displayed=off, cursor blinks=off]
   0x06,   // entry mode set         [decrement, don't shift display]
   0x01      // clear display
};

void lcd_clock ()
{
   delay_us(2);
   output_high(LCD_en);
   delay_us(2);
   output_low(LCD_en);
}

void lcd_send_nibble (byte n)
{
   output_bit(LCD_d4, shift_right(&n,1,0) );
   output_bit(LCD_d5, shift_right(&n,1,0) );
   output_bit(LCD_d6, shift_right(&n,1,0) );
   output_bit(LCD_d7, shift_right(&n,1,0) );

   lcd_clock();
}

void lcd_send_cmd (byte n)
{
   output_low(LCD_rs);
   lcd_send_nibble(n >> 4);
   delay_us(1);
   lcd_send_nibble(n & 0x0F);
}

void lcd_init()
{
   int count;

   output_low(LCD_rs);
   output_low(LCD_en);
   delay_ms(15);

   for (count=0; count < 3; ++count)
   {
      lcd_send_nibble(0x03);
      delay_ms(5);
   }

   lcd_send_nibble(0x02);

   for (count=0; count < 5; ++count)
   {
      lcd_send_cmd(LCD_INIT_STRING[count]);
   }
}



Lcd doesnt want to intialize.
R/W pin is connected to the ground, because i wont read nothing from lcd, just write.

p.s. sory for my bad English.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Jul 13, 2005 11:39 am     Reply with quote
If you want to do it that way, then study Jon Ficks driver for ideas.
He's using a similar method:
http://www.vermontficks.org/lcdc2.htm
glavic



Joined: 13 Jul 2005
Posts: 7

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PostPosted: Wed Jul 13, 2005 4:43 pm     Reply with quote
PCM programmer wrote:
If you want to do it that way, then study Jon Ficks driver for ideas.
He's using a similar method:
http://www.vermontficks.org/lcdc2.htm
Tnx, it works.
Kit
Guest
PostPosted: Thu Jul 14, 2005 3:34 am     Reply with quote
When I tried to compile the source code vermontficks.com
the compiler said that "cSkip" is undefined.

I have read through again the source code, and i have no idea what is that.
btw, i commented the if (!cSkip) and it works.

Can anyone answer my questions?
glavic



Joined: 13 Jul 2005
Posts: 7

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PostPosted: Thu Jul 14, 2005 4:08 am     Reply with quote
Kit wrote:
When I tried to compile the source code vermontficks.com
the compiler said that "cSkip" is undefined.

I have read through again the source code, and i have no idea what is that.
btw, i commented the if (!cSkip) and it works.

Can anyone answer my questions?
Jep, cSkip is undefined.

Just change function >
Code:
#separate void LCD_PutChar ( unsigned int cX )
    {
    /* this subroutine works specifically for 4-bit Port A */
    if ( !cSkip )
        {
        output_high ( LCD_RS );
        LCD_SetData ( swap ( cX ) );     /* send high nibble */
        LCD_PulseEnable();
        LCD_SetData ( swap ( cX ) );     /* send low nibble */
        LCD_PulseEnable();
        output_low ( LCD_RS );
        }
    }


to

Code:
#separate void LCD_PutChar ( unsigned int cX )
    {
    /* this subroutine works specifically for 4-bit Port A */
        output_high ( LCD_RS );
        LCD_PutCmd( cX );
        output_low ( LCD_RS );
    }
guest
Guest
PostPosted: Sun Jul 24, 2005 1:36 pm     Reply with quote
Same here,

No way that i am able to get the picc lcd driver running.
It works perfectly with the pic16f877, but not with the 84a or the 628a.

Why i dunno.

http://www.vermontficks.org/lcdc2.htm

This one works without any problem.

regards,

Evert
guest
Guest
PostPosted: Sun Jul 24, 2005 2:04 pm     Reply with quote
Same here,

No way that i am able to get the picc lcd driver running.
It works perfectly with the pic16f877, but not with the 84a or the 628a.

Why i dunno.

http://www.vermontficks.org/lcdc2.htm

This one works without any problem.

regards,

Evert
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