clcd.c

#include <xc.h>
#include "clcd.h"

void clcd_write(unsigned char byte, unsigned char mode)  // byte -> 'A', 1
{
    CLCD_RS = (__bit)mode;
    
    CLCD_DATA_PORT = byte & 0xF0;   // 0x41 & 0xF0 : 0x40 : 0100 0000 (RD7 to RD4)
    CLCD_EN = HI;
    __delay_us(100);
    CLCD_EN = LOW;

    CLCD_DATA_PORT = (unsigned char)((byte & 0x0F) << 4); // 0x41 & 0x0F : 0000 0001 << 4 = PORTD 
    CLCD_EN = HI;
    __delay_us(100);
    CLCD_EN = LOW;
    
    __delay_us(4100); // 4.1msec
}

static void init_display_controller(void)
{
    /* Startup Time for the CLCD controller */
    __delay_ms(30);
    
    /* The CLCD Startup Sequence */
    clcd_write(EIGHT_BIT_MODE, INST_MODE);
    __delay_us(4100);
    clcd_write(EIGHT_BIT_MODE, INST_MODE);
    __delay_us(100);
    clcd_write(EIGHT_BIT_MODE, INST_MODE);
    __delay_us(1); 
    
    clcd_write(FOUR_BIT_MODE, INST_MODE);
    __delay_us(100);
    clcd_write(TWO_LINES_5x8_4_BIT_MODE, INST_MODE);
    __delay_us(100);
    clcd_write(CLEAR_DISP_SCREEN, INST_MODE);
    __delay_us(500);
    clcd_write(DISP_ON_AND_CURSOR_OFF, INST_MODE);
    __delay_us(100);
}

void init_clcd(void)
{
    /* Setting the CLCD Data Port as Output */
    CLCD_DATA_PORT_DDR = 0x00;
    
    /* Setting the RS and EN lines as Output */
    CLCD_RS_DDR = 0;
    CLCD_EN_DDR = 0;
    
    init_display_controller();
}

void clcd_putch(const char data, unsigned char addr)
{
    clcd_write(addr, INST_MODE);
    clcd_write(data, DATA_MODE);
}

void clcd_print(const char *str, unsigned char addr)
{
    clcd_write(addr, INST_MODE);
    
    while (*str != '\0')
    {
        clcd_write(*str, DATA_MODE); 
        str++;
    }
}