Adaptador de teclado PS2 para MSX – Parte 14

Olá Pessoal;

Segue os primeiros códigos do nosso programa;

Programa [main.c]

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Projeto: CONVERSOR DE TECLADO/MOUSE PS2 PARA MSX *
* MSXRevival *
* Dexter *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* REVISAO: 22/03/2012 *
* Definição das variaveis usadas *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Rotinas de definicoes de LCD e PIC utilizado *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#include <D:\Projetos\MSX\Teclado e Mouse PS2 para MSX\main.h>
#include <D:\Projetos\MSX\Teclado e Mouse PS2 para MSX\lcd.c>
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Programa Principal *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
void main()
{

// Inicializa o LCD
lcd_init();
// x = coluna
// y = linha
lcd_gotoxy(1,1);
printf(lcd_putc,”XXXXXXXXXXXXXXXX”);
lcd_gotoxy(1,2);
printf(lcd_putc,”XXXXXXXXXXXXXXXX”);

while(true)
{

delay_ms(3000); // Aguarda 3 segundos
lcd_init();
lcd_gotoxy(4,1);
printf(lcd_putc,”MSXREVIVAL”);
lcd_gotoxy(2,2);
printf(lcd_putc,”CONVERSOR PS/2″);
delay_ms(3000);
lcd_init();
lcd_gotoxy(5,1);
printf(lcd_putc,”PROJETOS”);
lcd_gotoxy(2,2);
printf(lcd_putc,”ELETRONICOS-MSX”);

}
}

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Fim do Programa *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

Programa [main.h]

#include <16f628a.h>
#include <stdio.h>

#FUSES NOWDT //No Watch Dog Timer
#FUSES HS //Internal RC Osc
#FUSES INTRC //Internal RC Osc
#FUSES NOPUT //No Power Up Timer
#FUSES NOPROTECT //Code not protected from reading
#FUSES NOBROWNOUT //No brownout reset
#FUSES MCLR //Master Clear pin enabled
#FUSES NOLVP //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOCPD //No EE protection

#use delay(clock=8000000)  //Velocidade

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Fim do Programa *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

E finalmente o driver que controla nosso LCD.

Programa [ lcd.c ]

///////////////////////////////////////////////////////////////////////////////
//// LCD.C ////
//// Driver for common LCD modules ////
//// ////
//// lcd_init() Must be called before any other function. ////
//// ////
//// lcd_putc(c) Will display c on the next position of the LCD. ////
//// The following have special meaning: ////
//// \f Clear display ////
//// \n Go to start of second line ////
//// \b Move back one position ////
//// ////
//// lcd_gotoxy(x,y) Set write position on LCD (upper left is 1,1) ////
//// ////
//// lcd_getc(x,y) Returns character at position x,y on LCD ////
//// ////
//// CONFIGURATION ////
//// The LCD can be configured in one of two ways: a.) port access or ////
//// b.) pin access. Port access requires the entire 7 bit interface ////
//// connected to one GPIO port, and the data bits (D4:D7 of the LCD) ////
//// connected to sequential pins on the GPIO port. Pin access ////
//// has no requirements, all 7 bits of the control interface can ////
//// can be connected to any GPIO using several ports. ////
//// ////
//// To use port access, #define LCD_DATA_PORT to the SFR location of ////
//// of the GPIO port that holds the interface, -AND- edit LCD_PIN_MAP ////
//// of this file to configure the pin order. If you are using a ////
//// baseline PIC (PCB), then LCD_OUTPUT_MAP and LCD_INPUT_MAP also must ////
//// be defined. ////
//// ////
//// Example of port access: ////
//// #define LCD_DATA_PORT getenv(“SFR:PORTD”) ////
//// ////
//// To use pin access, the following pins must be defined: ////
//// LCD_ENABLE_PIN ////
//// LCD_RS_PIN ////
//// LCD_RW_PIN ////
//// LCD_DATA0 ////
//// LCD_DATA1 ////
//// LCD_DATA2 ////
//// LCD_DATA3 ////
//// LCD_DATA4 ////
//// ////
//// Example of pin access: ////
//// #define LCD_ENABLE_PIN PIN_E0 ////
//// #define LCD_RS_PIN PIN_E1 ////
//// #define LCD_RW_PIN PIN_E2 ////
//// #define LCD_DATA0 PIN_D4 ////
//// #define LCD_DATA1 PIN_D5 ////
//// #define LCD_DATA2 PIN_D6 ////
//// #define LCD_DATA3 PIN_D7 ////
//// ////
///////////////////////////////////////////////////////////////////////////////
//// (C) Copyright 1996,2009 Custom Computer Services ////
//// This source code may only be used by licensed users of the CCS C ////
//// compiler. This source code may only be distributed to other ////
//// licensed users of the CCS C compiler. No other use, reproduction ////
//// or distribution is permitted without written permission. ////
//// Derivative programs created using this software in object code ////
//// form are not restricted in any way. ////
///////////////////////////////////////////////////////////////////////////

typedef struct
{ // This structure is overlayed
BOOLEAN enable; // on to an I/O port to gain
BOOLEAN rs; // access to the LCD pins.
BOOLEAN rw; // The bits are allocated from
BOOLEAN unused; // low order up. ENABLE will
int data : 4; // be LSB pin of that port.
#if defined(__PCD__) // The port used will be LCD_DATA_PORT.
int reserved: 8;
#endif
} LCD_PIN_MAP;

#if defined(__PCB__)
// these definitions only need to be modified for baseline PICs.
// all other PICs use LCD_PIN_MAP or individual LCD_xxx pin definitions.
/* EN, RS, RW, UNUSED, DATA */
const LCD_PIN_MAP LCD_OUTPUT_MAP = {0, 0, 0, 0, 0};
const LCD_PIN_MAP LCD_INPUT_MAP = {0, 0, 0, 0, 0xF};
#endif

#ifndef LCD_ENABLE_PIN
#define lcd_output_enable(x) lcdlat.enable=x
#define lcd_enable_tris() lcdtris.enable=0
#else
#define lcd_output_enable(x) output_bit(LCD_ENABLE_PIN, x)
#define lcd_enable_tris() output_drive(LCD_ENABLE_PIN)
#endif

#ifndef LCD_RS_PIN
#define lcd_output_rs(x) lcdlat.rs=x
#define lcd_rs_tris() lcdtris.rs=0
#else
#define lcd_output_rs(x) output_bit(LCD_RS_PIN, x)
#define lcd_rs_tris() output_drive(LCD_RS_PIN)
#endif

#ifndef LCD_RW_PIN
#define lcd_output_rw(x) lcdlat.rw=x
#define lcd_rw_tris() lcdtris.rw=0
#else
#define lcd_output_rw(x) output_bit(LCD_RW_PIN, x)
#define lcd_rw_tris() output_drive(LCD_RW_PIN)
#endif

#ifndef LCD_DATA_PORT
#if defined(__PCB__)
#define LCD_DATA_PORT 0x06 //portb
#define set_tris_lcd(x) set_tris_b(x)
#elif defined(__PCM__)
#define LCD_DATA_PORT getenv(“SFR:PORTB”) //portd
#elif defined(__PCH__)
#define LCD_DATA_PORT getenv(“SFR:PORTB”) //portd
#elif defined(__PCD__)
#define LCD_DATA_PORT getenv(“SFR:PORTB”) //portd
#endif
#endif

#if defined(__PCB__)
LCD_PIN_MAP lcd, lcdlat;
#byte lcd = LCD_DATA_PORT
#byte lcdlat = LCD_DATA_PORT
#elif defined(__PCM__)
LCD_PIN_MAP lcd, lcdlat, lcdtris;
#byte lcd = LCD_DATA_PORT
#byte lcdlat = LCD_DATA_PORT
#byte lcdtris = LCD_DATA_PORT+0x80
#elif defined(__PCH__)
LCD_PIN_MAP lcd, lcdlat, lcdtris;
#byte lcd = LCD_DATA_PORT
#byte lcdlat = LCD_DATA_PORT+9
#byte lcdtris = LCD_DATA_PORT+0x12
#elif defined(__PCD__)
LCD_PIN_MAP lcd, lcdlat, lcdtris;
#word lcd = LCD_DATA_PORT
#word lcdlat = LCD_DATA_PORT+2
#word lcdtris = LCD_DATA_PORT-0x02
#endif

#ifndef LCD_TYPE
#define LCD_TYPE 2 // 0=5×7, 1=5×10, 2=2 lines
#endif

#ifndef LCD_LINE_TWO
#define LCD_LINE_TWO 0x40 // LCD RAM address for the second line
#endif

BYTE const LCD_INIT_STRING[4] = {0x20 | (lcd_type << 2), 0xc, 1, 6};
// These bytes need to be sent to the LCD
// to start it up.
BYTE lcd_read_nibble(void);

BYTE lcd_read_byte(void)
{
BYTE low,high;

#if defined(__PCB__)
set_tris_lcd(LCD_INPUT_MAP);
#else
#if (defined(LCD_DATA0) && defined(LCD_DATA1) && defined(LCD_DATA2) && defined(LCD_DATA3))
output_float(LCD_DATA0);
output_float(LCD_DATA1);
output_float(LCD_DATA2);
output_float(LCD_DATA3);
#else
lcdtris.data = 0xF;
#endif
#endif

lcd_output_rw(1);
delay_cycles(1);
lcd_output_enable(1);
delay_cycles(1);
high = lcd_read_nibble();

lcd_output_enable(0);
delay_cycles(1);
lcd_output_enable(1);
delay_us(1);
low = lcd_read_nibble();

lcd_output_enable(0);

#if defined(__PCB__)
set_tris_lcd(LCD_INPUT_MAP);
#else
#if (defined(LCD_DATA0) && defined(LCD_DATA1) && defined(LCD_DATA2) && defined(LCD_DATA3))
output_drive(LCD_DATA0);
output_drive(LCD_DATA1);
output_drive(LCD_DATA2);
output_drive(LCD_DATA3);
#else
lcdtris.data = 0x0;
#endif
#endif

return( (high<<4) | low);
}

BYTE lcd_read_nibble(void)
{
#if (defined(LCD_DATA0) && defined(LCD_DATA1) && defined(LCD_DATA2) && defined(LCD_DATA3))
BYTE n = 0x00;

/* Read the data port */
n |= input(LCD_DATA0);
n |= input(LCD_DATA1) << 1;
n |= input(LCD_DATA2) << 2;
n |= input(LCD_DATA3) << 3;

return(n);
#else
return(lcd.data);
#endif
}

void lcd_send_nibble(BYTE n)
{
#if (defined(LCD_DATA0) && defined(LCD_DATA1) && defined(LCD_DATA2) && defined(LCD_DATA3))
/* Write to the data port */
output_bit(LCD_DATA0, BIT_TEST(n, 0));
output_bit(LCD_DATA1, BIT_TEST(n, 1));
output_bit(LCD_DATA2, BIT_TEST(n, 2));
output_bit(LCD_DATA3, BIT_TEST(n, 3));
#else
lcdlat.data = n;
#endif

delay_cycles(1);
lcd_output_enable(1);
delay_us(2);
lcd_output_enable(0);
}

void lcd_send_byte(BYTE address, BYTE n)
{
lcd_output_rs(0);
while ( bit_test(lcd_read_byte(),7) ) ;
lcd_output_rs(address);
delay_cycles(1);
lcd_output_rw(0);
delay_cycles(1);
lcd_output_enable(0);
lcd_send_nibble(n >> 4);
lcd_send_nibble(n & 0xf);
}

void lcd_init(void)
{
BYTE i;

#if defined(__PCB__)
set_tris_lcd(LCD_OUTPUT_MAP);
#else
#if (defined(LCD_DATA0) && defined(LCD_DATA1) && defined(LCD_DATA2) && defined(LCD_DATA3))
output_drive(LCD_DATA0);
output_drive(LCD_DATA1);
output_drive(LCD_DATA2);
output_drive(LCD_DATA3);
#else
lcdtris.data = 0x0;
#endif
lcd_enable_tris();
lcd_rs_tris();
lcd_rw_tris();
#endif

lcd_output_rs(0);
lcd_output_rw(0);
lcd_output_enable(0);

delay_ms(15);
for(i=1;i<=3;++i)
{
lcd_send_nibble(3);
delay_ms(5);
}

lcd_send_nibble(2);
for(i=0;i<=3;++i)
lcd_send_byte(0,LCD_INIT_STRING[i]);
}

void lcd_gotoxy(BYTE x, BYTE y)
{
BYTE address;

if(y!=1)
address=LCD_LINE_TWO;
else
address=0;

address+=x-1;
lcd_send_byte(0,0×80|address);
}

void lcd_putc(char c)
{
switch (c)
{
case ‘\f’ : lcd_send_byte(0,1);
delay_ms(2);
break;

case ‘\n’ : lcd_gotoxy(1,2); break;

case ‘\b’ : lcd_send_byte(0,0×10); break;

default : lcd_send_byte(1,c); break;
}
}

char lcd_getc(BYTE x, BYTE y)
{
char value;

lcd_gotoxy(x,y);
while ( bit_test(lcd_read_byte(),7) ); // wait until busy flag is low
lcd_output_rs(1);
value = lcd_read_byte();
lcd_output_rs(0);

return(value);
}

O resultado final nessa primeira etapa pode ser visto na figura abaixo;

Projeto2

Com essa primeira  etapa concluída, sabemos que nosso PIC pode se comunicar com um LCD 16×2 em 4 bits utilizando a linguagem C da qual utilizei o compilador CCS.

Vocês podem reparar que fiz algumas modificações para tornar o programa bem simples, quero manter a simplicidade do projeto ao máximo para que qualquer pessoa possa construir seu conversor/adaptador.

Nossa próxima etapa agora é coletar os dados digitados no teclado do PC (PS2) e apresenta-lo no LCD.

Até mais

[]´s

MsxRevival

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