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path: root/n/lcd/src/lcd.c
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/* lcd.c */
/* lcd - affiche des messages sur l'�cran lcd. {{{
 *
 * Copyright (C) 2006 Christophe Le Blanc
 *
 * Robot APB Team/Efrei 2006.
 *        Web: http://assos.efrei.fr/robot/
 *      Email: robot AT efrei DOT fr
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * }}} */
#include "common.h"
#include "modules/twi/twi.h"
#include "modules/utils/utils.h"
#include "modules/uart/uart.h"
#include "modules/proto/proto.h"
#include "io.h"

#include <string.h>

void lcd_send_command (u8 cmd);

char key_read (void);
/* Envois une commande transit **/
void
lcd_transit_command (u8 cmd)
{
    lcd_send_command(cmd>>4);
    lcd_send_command(cmd);
}

/** Envois une commande. */
void
lcd_send_command (u8 cmd)
{
    PORTC = (PORTC & 0xf0) | (cmd & 0x0f);
    // Pas de RS car on n'�crit pas sur le lcd, c'est une commande !
    PORTD = PORTD | 0x80; // puis E � 1
    PORTD = PORTD & 0x7f; //
    utils_delay_us (40);
}

/* Envois un caract�re. */
void
lcd_send_character (u8 c)
{
    PORTC = (PORTC & 0xf0) | (c>>4); // c'est �a !
    PORTD = (PORTD | 0x40); // 1 � RS
    PORTD = PORTD | 0x80; // puis 1 � E
    PORTD = PORTD & 0x7f; // puis on remet 0 � E
    utils_delay_us (40);


    PORTC = (PORTC & 0xf0) | (c & 0xf); // c'est �a !
    PORTD = PORTD | 0x80; // puis 1 � E
    PORTD = PORTD & 0x7f; // puis on remet 0 � E
    PORTD = (PORTD & 0xBF); // 0 � RS
    utils_delay_us (40);
}

/* Envois une cha�ne de caract�re. */
void
lcd_send_string_n (const char *s, u8 i)
{
    u8 cpt ;
    lcd_transit_command(0x01); // suffit d'envoyer les bits de gauche � droite : D7D6D5D4 en hexa
    utils_delay_ms(2);
    lcd_transit_command(0x02);
    utils_delay_ms(2);
    for (cpt = 0 ; cpt < i ; cpt++)
      {
	if (cpt == 16)
	  {
	    lcd_transit_command(0xc0);
	    utils_delay_us(40);
	  }
	lcd_send_character(s[cpt]);
      }
}

//lcd_send_line(const char *s,u8 i,u8 l)
//{
//    u8 cpt ;
//    lcd_transit_command(0x01); // suffit d'envoyer les bits de gauche � droite : D7D6D5D4 en hexa
//    utils_delay_ms(2);
//    if ( l == 0 )
//        lcd_transit_command(0x02);
//    else
//	lcd_transit_command(0xc0);
//    utils_delay_ms(2);
//    for (cpt = 0 ; cpt < 16  && cpt < i ; cpt++)
//      {
//	lcd_send_character(s[cpt]);
//      }
//
//}

/* Envois une cha�ne de caract�re. */
void
lcd_send_string (const char *s)
{
    lcd_send_string_n (s, strlen (s));
}

/* Initialisation du lcd.  */
void 
lcd_init (void)
{
    DDRC = 0x0f;
    DDRD = 0xC0;
    // PD0 RX ( uart )
    // PD1 TX ( uart )
    // PD2 - PD5 clavier
    // PD6 RS ( lcd )
    // PD7 E  ( lcd )
    PORTD = 0x3C; // pull up
    DDRB = 0x01;
    utils_delay_ms (15); // suffit d'envoyer les bits de gauche � droite : D7D6D5D4 en hexa
    lcd_transit_command (0x01); // efface ecran
    lcd_transit_command (0x01);
    lcd_transit_command (0x13); // force 8 bits
    utils_delay_ms (4.5);
    lcd_transit_command (0x33);
    utils_delay_ms (1);
    lcd_transit_command (0x22); // passage mode 4 bits // def afficheur
    lcd_transit_command (0x80);
    utils_delay_ms (2); // affichage fonction
    lcd_transit_command (0xc0); // d�placement curseur
    lcd_transit_command (0x60); // efface ecran
    lcd_transit_command (0x10);
}

void
lcd_clear(void)
{
    lcd_send_command (0x0);
    lcd_send_command (0x1);
    utils_delay_ms (20);
}



char
key_get (char old_key)
{
    char new_key = key_read ();
    if (old_key == 0)
      {
	old_key = new_key;
	
	if (old_key != 0)
	    proto_send1b ('R', new_key);
	
      }
    else if (new_key == 0)
      {
	char i = 0;
	while ( key_read () == 0 && i < 3 )
	  {
	    utils_delay_ms(250); // was 100ms
	    if ( i == 2 )
	        old_key = 0;
	    i++;
	  }
      }
    else if ( old_key != new_key )
      {
 	proto_send1b ('R', new_key);
	old_key = new_key;
      }
    return old_key;
}

char
key_read (void)
{
    char key = 0;
    PORTC = (PORTC & 0xf0) | 0x0f;
    uint8_t i = 0;
     while ( key == 0 && i < 4 )
      {
	switch (i)
	  {
	  case 0 : PORTC = (PORTC & 0xf0) | 0x0E;
		   break;
	  case 1 : PORTC = (PORTC & 0xf0) | 0x0D;
		   break;
	  case 2 : PORTC = (PORTC & 0xf0) | 0x0B;
		   break;
	  case 3 : PORTC = (PORTC & 0xf0) | 0x07;
		   break;
	  }
	uint8_t key_tmp = PIND;
	if ( ~(key_tmp & 0x3c) & 0x04  )
    switch (i)
	      {
	      case 0 : key = '1';
		       break;
	      case 1 : key = '4';
		       break;
	      case 2 : key = '7';
		       break;
	      case 3 : key = 'A';
		       break;
	      }
	else if ( ~(key_tmp & 0x3c) & 0x08)
	    switch (i)
	      {
	      case 0 : key = '2';
		       break;
	      case 1 : key = '5';
		       break;
	      case 2 : key = '8';
		       break;
	      case 3 : key = '0';
		       break;
	      }
	else if ( ~(key_tmp & 0x3c) & 0x10)
	    switch (i)
	      {
	      case 0 : key = '3';
		       break;
	      case 1 : key = '6';
		       break;
	      case 2 : key = '9';
		       break;
	      case 3 : key = 'B';
		       break;
	      }
	else if ( ~(key_tmp & 0x3c) & 0x20)
	    switch (i)
	      {
	      case 0 : key = '3';
		       break;
	      case 1 : key = 'E';
		       break;
	      case 2 : key = 'D';
		       break;
	      case 3 : key = 'C';
		       break;
	      }
	i++;
//	if (i==4)
//	    i=0;
    }
    PORTC = (PORTC & 0xf0);
    return key;
}


void
proto_callback (uint8_t cmd, uint8_t size, uint8_t *args)
{
    switch (cmd)
      {
      // reset
      case 'z':
	if (size != 0)
	  {
	    proto_send0 ('?');
	    return;
	  }
	else
	  {
	    utils_reset ();
	  }
	break;
      // affiche un message 32 caract�re
      case 'p':
	lcd_send_string_n (args, size);
	break;
      // Efface l'�cran
      case 'C':
	if (size != 0)
	  {
	    proto_send0 ('?');
	    return;
	  }
	else
	  {
	    lcd_clear ();
	  }
	break;
      // Lit une touche au clavier (bloquant)
      // revoit un caract�re {1234567890ABCDEF}
      case 'R':
	proto_send1b ('R',key_read ());
	break;
      default:
	/* This is to handle default commands, return an error. */
	proto_send0 ('?');
	return;
      }
    /* When no error acknoledge. */
    proto_send (cmd, size, args);
}

/* Fonction principale */
int
main (void)
{
    char old_key = 0;
    uint8_t data_rcpt[TWI_SL_RCPT_SIZE];
    sei ();
    uart0_init ();
    lcd_init ();
    twi_init(0x02);
    proto_send0 ('z');
    lcd_send_string (" LCD initialise                 ");
    while (1)
      {
	if (uart0_poll ())
	    proto_accept (uart0_getc ());
	utils_delay_ms(3);
	old_key = key_get (old_key);

	if (twi_sl_poll (data_rcpt, TWI_SL_RCPT_SIZE))
	  {
	    lcd_send_string_n(data_rcpt,32);
	  }

	twi_sl_update (&old_key, TWI_SL_SEND_SIZE);
	
      }
    return 0;
}