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3 Wire LCD with 4094 Shift Register

 
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sshahryiar



Joined: 05 May 2010
Posts: 94
Location: Dhaka, Bangladesh

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3 Wire LCD with 4094 Shift Register
PostPosted: Thu Aug 27, 2015 4:54 am     Reply with quote
LCD.h

Code:

#define SDO pin_A0
#define SCK pin_A1
#define STB pin_A2

#define clear_display 0x01
#define goto_home 0x02
         
#define cursor_direction_inc (0x04 | 0x02)
#define cursor_direction_dec (0x04 | 0x00)
#define display_shift (0x04 | 0x01)
#define display_no_shift (0x04 | 0x00)

#define display_on (0x08 | 0x04)
#define display_off (0x08 | 0x02)
#define cursor_on (0x08 | 0x02)                           
#define cursor_off (0x08 | 0x00)
#define blink_on (0x08 | 0x01)
#define blink_off (0x08 | 0x00)
                                   
#define _8_pin_interface (0x20 | 0x10)
#define _4_pin_interface (0x20 | 0x00)
#define _2_row_display (0x20 | 0x08)
#define _1_row_display (0x20 | 0x00)
#define _5x10_dots (0x20 | 0x40)
#define _5x7_dots (0x20 | 0x00)
                                                   
#define dly 0x01


unsigned char data_value = 0x00;
                                   
                                                                         
void SIPO();
void LCD_init(); 
void LCD_command(unsigned char value);
void LCD_send_data(unsigned char value);
void LCD_4bit_send(unsigned char lcd_data);                                     
void LCD_putstr(char *lcd_string);               
void LCD_putchar(char char_data);             
void LCD_clear_home();           
void LCD_goto(unsigned char x_pos, unsigned char y_pos);   



LCD.c

Code:

#include "lcd.h"


void SIPO()
{
    unsigned char clk = 0x08;
    unsigned char temp = 0x00;
   
    temp = data_value;
    output_low(STB);
                                               
    while(clk > 0)                                     
    {                       
        output_bit(SDO, (temp & 0x80));
        output_high(SCK);
        temp <<= 1;   
        clk--;                 
        output_low(SCK);   
    }       
    output_high(STB);   
}
                             

void LCD_init()
{                                     
    unsigned char t = 0x0A;

    data_value = 0x08;
    SIPO();
    while(t > 0x00)
    {   
            delay_ms(dly);
            t--;
    };     
   
    data_value = 0x30;
    SIPO();
                             
    data_value |= 0x08;
    SIPO();
    delay_ms(dly);
    data_value &= 0xF7;
    SIPO();
    delay_ms(dly);
             
    data_value = 0x30;
    SIPO();
                   
    data_value |= 0x08;
    SIPO();
    delay_ms(dly);
    data_value &= 0xF7;
    SIPO();
    delay_ms(dly);

    data_value = 0x30;
    SIPO();

    data_value |= 0x08;
    SIPO();
    delay_ms(dly);
    data_value &= 0xF7;
    SIPO();
    delay_ms(dly);

    data_value = 0x20;
    SIPO();
                   
    data_value |= 0x08;
    SIPO();
    delay_ms(dly);
    data_value &= 0xF7;
    SIPO();
    delay_ms(dly);

    LCD_command(_4_pin_interface | _2_row_display | _5x7_dots);         
    LCD_command(display_on | cursor_off | blink_off);     
    LCD_command(clear_display);         
    LCD_command(cursor_direction_inc | display_no_shift);       
}   


void LCD_command(unsigned char value)
{                                   
    data_value &= 0xFB;
    SIPO();
    LCD_4bit_send(value);           
}
   

void LCD_send_data(unsigned char value)
{                               
    data_value |= 0x04;
    SIPO();
    LCD_4bit_send(value);
} 
   

void LCD_4bit_send(unsigned char lcd_data)       
{
    unsigned char temp = 0x00;
     
    temp = (lcd_data & 0xF0);
    data_value &= 0x0F;   
    data_value |= temp;   
    SIPO();
                                         
    data_value |= 0x08;
    SIPO();
    delay_ms(dly);
    data_value &= 0xF7;
    SIPO();
    delay_ms(dly);
   
    temp = (lcd_data & 0x0F);
    temp <<= 0x04;     
    data_value &= 0x0F; 
    data_value |= temp;                           
    SIPO();
               
    data_value |= 0x08;
    SIPO();
    delay_ms(dly);
    data_value &= 0xF7;
    SIPO();
    delay_ms(dly);
} 


void LCD_putstr(char *lcd_string)
{
    while (*lcd_string != '\0')   
    {
        LCD_send_data(*lcd_string);
        lcd_string++;
    };
}


void LCD_putchar(char char_data)
{
    LCD_send_data(char_data);
}


void LCD_clear_home()
{
    LCD_command(clear_display);
    LCD_command(goto_home);
}


void LCD_goto(unsigned char x_pos,unsigned char y_pos)
{                                                   
    if(y_pos == 0)   
    {                             
        LCD_command(0x80 | x_pos);
    }
    else
    {                                             
        LCD_command(0x80 | 0x40 | x_pos);
    }
}



Example:

Code:

#include <12F675.h>


#device *= 16

                                 
#fuses NOWDT, PROTECT, CPD, NOMCLR, INTRC_IO, BROWNOUT, PUT

                               
#use delay (internal = 4MHz)   
#include "lcd.c"                         


void setup();                       


void main()
{         
    char txt1[] = {"MicroArena"};
    char txt2[] = {"SShahryiar"};
                                   
    setup();
                                         
    LCD_goto(3, 0);                             
    LCD_putstr(txt1);
    LCD_goto(3, 1);
    LCD_putstr(txt2); 
    while(TRUE)
    {
    };
}                                       
           


void setup()
{
    disable_interrupts(GLOBAL);
    setup_comparator(NC_NC_NC_NC);
    setup_ADC(ADC_off);
    setup_ADC_ports(no_analogs);
    setup_timer_0(T0_internal);     
    setup_timer_1(T1_disabled);
    set_timer0(0); 
    set_timer1(0);
    LCD_init(); 
    LCD_clear_home(); 
    delay_ms(200);       
}




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SShahryiar
asmboy



Joined: 20 Nov 2007
Posts: 2128
Location: albany ny

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PostPosted: Fri Aug 28, 2015 6:24 pm     Reply with quote
has this ever been BUILT with hardware and checked?

or is this 101% Proteus/Isis ?
sshahryiar



Joined: 05 May 2010
Posts: 94
Location: Dhaka, Bangladesh

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LCD reply
PostPosted: Fri Aug 28, 2015 7:29 pm     Reply with quote
I'm not an absolute believer of simulations and so whatever I do, I do it in real life.... Check this out: https://www.youtube.com/watch?v=XMWXVP_9nwY

Although in the video I tested the code with a ATTiny45, it also works with PICs too....
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SShahryiar
asmboy



Joined: 20 Nov 2007
Posts: 2128
Location: albany ny

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PostPosted: Fri Aug 28, 2015 7:33 pm     Reply with quote
thats good to see. Nicely done.
Nascimento



Joined: 30 Dec 2015
Posts: 3

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PostPosted: Thu Dec 31, 2015 8:04 am     Reply with quote
hi friend you could send the pcb 4094?
ps: google translator
asmboy



Joined: 20 Nov 2007
Posts: 2128
Location: albany ny

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PostPosted: Thu Dec 31, 2015 4:05 pm     Reply with quote
i don't understand why you don't use the 74HC595 for which CCS provides a driver in the examples section.
name 74595.c in the DRIVERS folder of your CCS install

here is a link to the datasheet for the 4094 which i do NOT reccomend.

http://www.mouser.com/ds/2/405/cd4094b-439708.pdf
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