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#include <p18cxxx.h>
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#include "lcd_4b.h"
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#define RS LATDbits.LATD0
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#define R_W LATDbits.LATD1
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#define E LATDbits.LATD2
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#define DATA LATD
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// Initialize PORTD
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void init_port_lcd (void)
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{
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TRISD = 0; // PORTD is an output
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LATD = 0x00;
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}
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// Write a character at current cursor position
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void lcd_car (unsigned char car)
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{
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tpo_us (200);
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RS = 1;
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R_W = 0;
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E = 0;
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DATA = ((car & 0xf0) | (DATA & 0x0f)); // storing higher bits in DATA
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tpo_us (10);
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E = 1;
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tpo_us (10);
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E = 0;
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car <<= 4;
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DATA = ((car & 0xf0) | (DATA & 0x0f)); // storing lower bits in DATA
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tpo_us (10);
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E = 1;
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tpo_us (10);
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E = 0;
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}
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// Write data to CGRAM/DDRAM
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void lcd_com (unsigned char commande)
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{
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tpo_us (100);
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RS = 0;
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R_W = 0;
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E = 0;
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DATA = ((commande & 0xf0) | (DATA & 0x0f));
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tpo_us (10);
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E = 1;
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tpo_us (10);
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E = 0;
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commande <<= 4;
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DATA = ((commande & 0xf0) | (DATA & 0x0f));
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tpo_us (10);
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E = 1;
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tpo_us (10);
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E = 0;
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}
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// Write data to CGRAM/DDRAM during initialization
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void lcd_com_init (unsigned char commande)
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{
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RS = 0;
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R_W = 0;
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E = 0;
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DATA = ((commande & 0xf0) | (DATA & 0x0f));
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tpo_us (10);
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E = 1;
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tpo_us (10);
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E = 0;
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}
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// 4-bit initialization
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void init_lcd (void)
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{
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tpo_ms (50);
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lcd_com_init (0x30); // Function set
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tpo_ms (5);
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lcd_com_init (0x30); // Function set
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tpo_us (150);
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lcd_com_init (0x30); // Function set
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tpo_us (150);
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lcd_com_init (0x20); // Function set
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lcd_com (0x28); // 4-bit interface, 4 display lines, 5x8 characters
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lcd_com (0x0C); // Cursor off and display on
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lcd_com (0x01); // Display clear
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lcd_com (0x06); // Entry mode set
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tpo_ms (5);
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}
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// Write a string at current cursor position
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void lcd_str (unsigned char *str)
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{
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unsigned char i=0;
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while(str[i]!= '\0')
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{
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lcd_car (str[i]);
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i++;
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}
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}
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// Fonctions de gestion du timer 0
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void tpo_ms (unsigned short tmr_val)
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{
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unsigned char data;
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T0CON = 0b00000100; // run in 16-bit timer, 1:32 prescale value
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tmr_val = 65535 - (375 * tmr_val);
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data = (tmr_val >> 8);
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TMR0H = data;
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TMR0L = tmr_val;
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T0CONbits.TMR0ON = 1; // starts the timer
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while (INTCONbits.TMR0IF == 0);
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T0CONbits.TMR0ON = 0; // stops the timer
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INTCONbits.TMR0IF = 0;
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}
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void tpo_us (unsigned short tmr_val)
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{
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unsigned char data;
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T0CON = 0b00001000; // run in 16-bit timer, no prescaler
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tmr_val = 65535 - ( 12 * tmr_val);
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data = (tmr_val >> 8);
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TMR0H = data;
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TMR0L = tmr_val;
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T0CONbits.TMR0ON = 1; // starts the timer
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while (INTCONbits.TMR0IF == 0);
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T0CONbits.TMR0ON = 0; // stops the timer
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INTCONbits.TMR0IF = 0;
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}
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