/**********************************************************************
* © 2006 Microchip Technology Inc.
*
* FileName: lcd.c
* Dependencies: p33FJ256GP710.h
* lcd.h
* delay.h
* Processor: dsPIC33F
* Compiler: MPLAB® C30 v2.01 or higher
*
* SOFTWARE LICENSE AGREEMENT:
* Microchip Technology Inc. (“Microchip”) licenses this software to you
* solely for use with Microchip dsPIC® digital signal controller
* products. The software is owned by Microchip and is protected under
* applicable copyright laws. All rights reserved.
*
* SOFTWARE IS PROVIDED “AS IS.” MICROCHIP EXPRESSLY DISCLAIMS ANY
* WARRANTY OF ANY KIND, WHETHER EXPRESS OR IMPLIED, INCLUDING BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE, OR NON-INFRINGEMENT. IN NO EVENT SHALL MICROCHIP
* BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT OR CONSEQUENTIAL
* DAMAGES, LOST PROFITS OR LOST DATA, HARM TO YOUR EQUIPMENT, COST OF
* PROCUREMENT OF SUBSTITUTE GOODS, TECHNOLOGY OR SERVICES, ANY CLAIMS
* BY THIRD PARTIES (INCLUDING BUT NOT LIMITED TO ANY DEFENSE THEREOF),
* ANY CLAIMS FOR INDEMNITY OR CONTRIBUTION, OR OTHER SIMILAR COSTS.
*
* REVISION HISTORY:
*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* Author Date Comments on this revision
*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* Richard Fischer 07/14/05 Explorer 16 board LCD support
* Priyabrata Sinha 01/27/06 Ported to non-prototype devices
*
*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* ADDITIONAL NOTES:
*
**********************************************************************/
#include "p33FJ256GP710.h"
#include "lcd.h"
#include "delay.h"
/*
For Explorer 16 board, here are the data and control signal definitions
RS -> RB15
E -> RD4
RW -> RD5
DATA -> RE0 - RE7
*/
// Control signal data pins
#define RW LATDbits.LATD5 // LCD R/W signal
#define RS LATBbits.LATB15 // LCD RS signal
#define E LATDbits.LATD4 // LCD E signal
//#define E LATFbits.LATF1 // LCD E signal
// Control signal pin direction
#define RW_TRIS TRISDbits.TRISD5
#define RS_TRIS TRISBbits.TRISB15
#define E_TRIS TRISDbits.TRISD4
//#define E_TRIS TRISFbits.TRISF1
// Data signals and pin direction
#define DATA LATE // Port for LCD data
#define DATAPORT PORTE
#define TRISDATA TRISE // I/O setup for data Port
/****************************************************************************/
/***** LCD SUBROUTINE *****/
void Init_LCD( void ) // initialize LCD display
{
// 15mS delay after Vdd reaches nnVdc before proceeding with LCD initialization
// not always required and is based on system Vdd rise rate
Delay(Delay_15mS_Cnt); // 15ms delay
/* set initial states for the data and control pins */
LATE &= 0xFF00;
RW = 0; // R/W state set low
RS = 0; // RS state set low
E = 0; // E state set low
/* set data and control pins to outputs */
TRISE &= 0xFF00;
RW_TRIS = 0; // RW pin set as output
RS_TRIS = 0; // RS pin set as output
E_TRIS = 0; // E pin set as output
/* 1st LCD initialization sequence */
DATA &= 0xFF00;
DATA |= 0x0038;
E = 1;
Nop();
Nop();
Nop();
E = 0; // toggle E signal
Delay(Delay_5mS_Cnt); // 5ms delay
/* 2nd LCD initialization sequence */
DATA &= 0xFF00;
DATA |= 0x0038;
E = 1;
Nop();
Nop();
Nop();
E = 0; // toggle E signal
Delay_Us( Delay200uS_count ); // 200uS delay
/* 3rd LCD initialization sequence */
DATA &= 0xFF00;
DATA |= 0x0038;
E = 1;
Nop();
Nop();
Nop();
E = 0; // toggle E signal
Delay_Us( Delay200uS_count ); // 200uS delay
lcd_cmd( 0x38 ); // function set
lcd_cmd( 0x0C ); // Display on/off control, cursor blink off (0x0C)
lcd_cmd( 0x06 ); // entry mode set (0x06)
}
void lcd_cmd( char cmd ) // subroutiune for lcd commands
{
// TRISD &= 0xFF00; // ensure RD0 - RD7 are outputs
DATA &= 0xFF00; // prepare RD0 - RD7
DATA |= cmd; // command byte to lcd
RW = 0; // ensure RW is 0
RS = 0;
E = 1; // toggle E line
Nop();
Nop();
Nop();
E = 0;
Delay(Delay_5mS_Cnt); // 5ms delay
}
void lcd_data( char data ) // subroutine for lcd data
{
// TRISD &= 0xFF00; // ensure RD0 - RD7 are outputs
RW = 0; // ensure RW is 0
RS = 1; // assert register select to 1
DATA &= 0xFF00; // prepare RD0 - RD7
DATA |= data; // data byte to lcd
E = 1;
Nop();
Nop();
Nop();
E = 0; // toggle E signal
RS = 0; // negate register select to 0
Delay_Us( Delay200uS_count ); // 200uS delay
Delay_Us( Delay200uS_count ); // 200uS delay
}
void puts_lcd( unsigned char *data, unsigned int count )
{
while ( count )
{
lcd_data( *data++ );
count --;
}
}
