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Isaac Marino Bavaresco[IMB-yahoo-J86] Says
//==============================================================================
// Copyright (c) 2005-2010, Isaac Marino Bavaresco
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Neither the name of the author nor the
// names of its contributors may be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ''AS IS'' AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//==============================================================================
// isaacbavaresco@yahoo.com.br
//==============================================================================
// Set TAB width to 4 characters
//==============================================================================
#if !defined __LCD_CFG_H__
#define __LCD_CFG_H__
//==============================================================================
//##############################################################################
//# #
//# THIS FILE IS HEAVILY HARDWARE-DEPENDANT #
//# #
//# IT MUST BE CHANGED TO FIT YOUR BOARD'S CIRCUIT AND CLOCK #
//# #
//##############################################################################
// This version is taylored for my board at 8MHz and Hi-Tech PICC.
// Change this file for your own needs.
//==============================================================================
//
// PIC16F648A
//
// +-----------------U-----------------+
// | |
// LCD_DI <- ==| 1 RA2/AN2/Vref AN1/RA1 18 |== -> LCD_D4
// | |
// LCD_E <- ==| 2 RA3/AN3/CMP1 AN0/RA0 15 |== -> LCD_D5
// | |
// PWRON <- ==| 3 RA4/T0CKI/CMP2 OSC1/RA7 16 |== -> LCD_D6
// | |
// RIGHT -> ==| 4 RA5/!MCLR OSC2/RA6 15 |== -> LCD_D7
// | |
// ==| 5 GND VCC 14 |==
// | |
// <- ==| 6 RB0/INT T1OSI/RB7 13 |== <- UP
// | |
// RXD -> ==| 7 RB1/RX/DT T1CKI/T1OSO/RB6 12 |== <- DOWN
// | |
// TXD <- ==| 8 RB2/TX/CK RB5 11 |== ->
// | |
// LEFT -> ==| 9 RB3/CCP1 RB4 10 |== ->
// | |
// +-----------------------------------+
//
//
//==============================================================================
#include <pic.h>
//==============================================================================
// Define this macro if your board uses the LCD R/!W pin.
//#define USE_READ_PIN
// Define this macro if you want to detect when the LCD is not connected or is
// damaged. Works only if using the R/!W pin.
//#define DETECT_FAILURE
// Number of repetitions before signailng a defective display.
//#define NUMBER_OF_READS_TIMEOUT 2000
// Define this macro if your board uses four bit interface.
#define USE_FOUR_BIT_INTERFACE
//==============================================================================
//==============================================================================
//==============================================================================
//==============================================================================
// Helper macros. Depend on your board.
#define DATAPORT_OUT PORTA
#define DATAPORT_IN PORTA
#define DATAPORT_DIR TRISA
#define LCD_D4 RA1
#define LCD_D5 RA0
#define LCD_D6 RA7
#define LCD_D7 RA6
#define LCD_E RA3
#define LCD_E_DIR TRISA3
#if defined USE_READ_PIN
#define LCD_RW RB6
#define LCD_RW_DIR TRISB6
#endif // defined USE_READ_PIN
#define LCD_DI RA2
#define LCD_DI_DIR TRISA2
//==============================================================================
// These macros depend on the model of your LCD module.
// The size your screen will have at startup.
#define INITIAL_MAXX 16
#define INITIAL_MAXY 2
// The maximum size your screen may have. Larger sizes will use more RAM if your
// board doesn't use the R/!W pin, because a screen-buffer is kept in RAM to
// allow scroll operations.
#define MAXIMUM_MAXX 16
#define MAXIMUM_MAXY 2
// The usual is 8, but 4 is more useful for such a narrow display.
#define TAB_WIDTH 4
//==============================================================================
// Interrupt-related macros
// If you don't need to disable interrupts, just define them all as empty macros
// The macro 'DeclareIntSaveVar' must declare 's' with a type suitable to hold
// the CPU's current interrupts (enabled/disabled) state
#define DeclareIntSaveVar( s ) unsigned char s
// The macro 'SaveInterruptsState' must save the current interrupts state to 's'
#define SaveInterruptsState( s ) (( s ) = INTCON & 0xc0 )
// The macro 'RestoreInterruptsState' must restore the previous interrupts state
// from 's'
#define RestoreInterruptsState( s ) ( INTCON = INTCON | ( s ))
// The macro 'DisableInterrupts' must disable all interrupts that may interfere
// with the LCD interface (for instance, an interrupt that uses the LCD interface
// pins to scan a keyboard)
#define DisableInterrupts() ( INTCON = INTCON & 0x3f )
//==============================================================================
// Data port manipulation macros
// The macro 'SetDataPortAsInputs' must set the data port bits (4 or 8,
// depending on the used mode) as inputs
#if defined USE_READ_PIN
#define SetDataPortAsInputs() ( DATAPORT_DIR |= 0xc3 )
#else // defined USE_READ_PIN
#define SetDataPortAsInputs()
#endif // defined USE_READ_PIN
// The macro 'SetDataPortAsOutputs' must set the data port bits (4 or 8,
// depending on the used mode) as outputs
#define SetDataPortAsOutputs() ( DATAPORT_DIR &= 0x3c )
// In 8-bit mode, the macro 'ReadDataPortValue' must read all 8 bits of the
// data port to 's', in 4-bit mode it must read the 4 bits of the data
// port to the higher 4 bits of 's'
#define ReadDataPortValue( s ) do \
{ \
s = 0; \
if( LCD_D7 ) s |= 0x80; \
if( LCD_D6 ) s |= 0x40; \
if( LCD_D5 ) s |= 0x20; \
if( LCD_D4 ) s |= 0x10; \
} \
while( 0 )
// In 8-bit mode, the macro 'SetDataPortValue' must output all the 8 bits of 's'
// to the data port, in 4-bit mode it must output the higher 4 bits of 's' to the
// data port
#define SetDataPortValue( s ) do \
{ \
char t; \
t = DATAPORT_OUT & 0x3c; \
if( s & 0x80 ) t |= 0x40; \
if( s & 0x40 ) t |= 0x80; \
if( s & 0x20 ) t |= 0x01; \
if( s & 0x10 ) t |= 0x02; \
DATAPORT_OUT = t; \
} \
while( 0 )
//( DATAPORT_OUT = DATAPORT_OUT & 0xf0 | ((( s ) >> 4 ) & 0x0f ))
// The following macros are only needed if you are using 4-bit interface
#if defined USE_FOUR_BIT_INTERFACE
// The macro 'ReadDataPortValueLow' must read the 4 bits of the data
// port to the lower 4 bits of 's' without disturbing its 4 higher bits.
#define ReadDataPortValueLow( s ) do \
{ \
if( LCD_D7 ) s |= 0x08; \
if( LCD_D6 ) s |= 0x04; \
if( LCD_D5 ) s |= 0x02; \
if( LCD_D4 ) s |= 0x01; \
} \
while( 0 )
// The macro 'SetDataPortValueLow' must output the lower 4 bits of 's' to
// the data port.
#define SetDataPortValueLow( s ) do \
{ \
char t; \
t = DATAPORT_OUT & 0x3c; \
if( s & 0x08 ) t |= 0x40; \
if( s & 0x04 ) t |= 0x80; \
if( s & 0x02 ) t |= 0x01; \
if( s & 0x01 ) t |= 0x02; \
DATAPORT_OUT = t; \
} \
while( 0 )
#endif // defined USE_FOUR_BIT_INTERFACE
//==============================================================================
// Control pins manipulation macros
#if defined USE_READ_PIN
#define SetRWAsRead() ( LCD_RW = 1 )
#define SetRWAsWrite() ( LCD_RW = 0 )
#define SetRWAsOutput() ( LCD_RW_DIR = 0 )
#else // defined USE_READ_PIN
#define SetRWAsRead()
#define SetRWAsWrite()
#define SetRWAsOutput()
#endif // defined USE_READ_PIN
#define SetDIValue( s ) ( LCD_DI = ( s ))
#define SetDIAsData() ( LCD_DI = 1 )
#define SetDIAsInstruction() ( LCD_DI = 0 )
#define SetDIAsOutput() ( LCD_DI_DIR = 0 )
#define SetEAsEnabled() ( LCD_E = 1 )
#define SetEAsDisabled() ( LCD_E = 0 )
#define SetEAsOutput() ( LCD_E_DIR = 0 )
//==============================================================================
void Delay_10us( unsigned short t );
// Delay macros.
#define Delay500ns() asm( "nop" )
// This macro is defined this way (without calling a function) to save call-stack
// levels, because it is used in the deepest function of the package.
// NOTE: The last "nop" is important to prevent the optimizer to optimize the sequence.
#define Delay37us() do \
{ \
asm( "movlw 9" ); \
asm( "addlw -1" ); \
asm( "btfss 3,2" ); \
asm( "goto $-2" ); \
asm( "nop " ); \
} \
while( 0 )
#define Delay100us() Delay_10us( 10 )
// This macro is defined this way (without calling a function) to save call-stack
// levels, because it is used in the deepest function of the package.
// NOTE: The last "nop" is important to prevent the optimizer to optimize the sequence.
#define Delay1520us() do \
{ \
asm( "movlw 254" ); \
asm( "nop " ); \
asm( "nop " ); \
asm( "addlw -1" ); \
asm( "btfss 3,2" ); \
asm( "goto $-4" ); \
asm( "nop " ); \
} \
while( 0 )
#define Delay4100us() Delay_10us( 410 )
#define Delay15ms() Delay_10us( 1500 )
//==============================================================================
// Macro or prototype for the function 'Beep'. Define it as an empty macro if
// your board doesn't have a buzzer or the like.
#define Beep()
//==============================================================================
// This macro defines the name that your 'putc' function must have to be linked
// with the library functions ('printf', etc).
// For MPLAB-C18 it is '_user_putc', for Hi-Tech PICC it is 'putch'.
#define LCD_PUTC putch
//==============================================================================
#endif // !defined __LCD_CFG_H__
//==============================================================================
ON 20100424@9:45:22 PM at page:
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Isaac Marino Bavaresco[IMB-yahoo-J86] Code:
/techref/member/IMB-yahoo-J86/lcd-lite.c.htm
ON 20100424@9:46:02 PM at page:
On a web page you were interested in at:
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Isaac Marino Bavaresco[IMB-yahoo-J86] Says
//==============================================================================
// Copyright (c) 2005-2010, Isaac Marino Bavaresco
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Neither the name of the author nor the
// names of its contributors may be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ''AS IS'' AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//==============================================================================
// isaacbavaresco@yahoo.com.br
//==============================================================================
// Set TAB width to 4 characters
//==============================================================================
#include "LCDcfg-lite.h"
//==============================================================================
//==============================================================================
//==============================================================================
//==============================================================================
//==============================================================================
#if defined USE_READ_PIN && defined DETECT_FAILURE
// Flag to indicate that the display is defective.
unsigned char displayfailed = 0;
#endif // defined USE_READ_PIN && defined DETECT_FAILURE
//==============================================================================
#define LCDWriteCmd(c) LCDWrite((c),0)
#define LCDWriteData(c) LCDWrite((c),1)
#define CMD_CLEAR_DISPLAY 0x01
#define CMD_SET_DDRAM_ADDRESS 0x80
//==============================================================================
// Writes a character or command to the display.
// Arguments:
// c The character or command to be written
// di Type of write: 0 = command, 1 = character
static void LCDWrite( unsigned char c, unsigned char di )
{
// Variable to save the interrupts state at function entry.
DeclareIntSaveVar( Aux );
#if defined USE_READ_PIN
unsigned char s;
#if defined DETECT_FAILURE
unsigned short n = NUMBER_OF_READS_TIMEOUT;
// The display has failed previously...
if( displayfailed )
// ... so we will not even try to access it
return;
#endif // defined DETECT_FAILURE
#endif // defined USE_READ_PIN
SaveInterruptsState( Aux );
#if defined USE_READ_PIN
// Repeat while bit BUSY == 1
do
{
RestoreInterruptsState( Aux );
// At this point a pending interrupt may be serviced, so we don't
// block the system for too long. On return, no assumption is
// made about the state of the LCD interface pins, an interrupt
// routine may change the value or direction of any pin, except
// of the ENABLE pin.
DisableInterrupts();
SetDataPortAsInputs();
// Set READ/!WRITE pin as read (1)
SetRWAsRead();
// Set DATA/!INSTRUCTION pin as instruction (0)
SetDIAsInstruction();
// Effectivate the data transfer.
SetEAsEnabled();
// Wait for the minimum 'tHIGH'.
Delay500ns();
// Read the status byte (only high nibble if in 4-bit mode).
ReadDataPortValue( s );
// Low half of the trasfer cycle.
SetEAsDisabled();
// Wait for the minimum 'tLOW'.
Delay500ns();
#if defined USE_FOUR_BIT_INTERFACE
// When using a 4-bit interface we need to do a dummy read
// Effectivate the data transfer.
SetEAsEnabled();
// Wait for the minimum 'tHIGH'.
Delay500ns();
// Low half of the trasfer cycle.
SetEAsDisabled();
// Wait for the minimum 'tLOW'.
Delay500ns();
#endif // defined USE_FOUR_BIT_INTERFACE
// Set READ/!WRITE pin as write (0)
SetRWAsWrite();
}
#if !defined DETECT_FAILURE
// Repeat until the BUSY bit is zero
while( s & 0x80 );
#else // !defined DETECT_FAILURE
// Repeat until the BUSY bit is zero or until the maximum number of repetitions.
while(( s & 0x80 ) && ( --n != 0u ));
// We tried the maximum number of times...
if( n == 0u )
// ... so we flag the display as failed
displayfailed = 1;
#endif // !defined DETECT_FAILURE
#else // defined USE_READ_PIN
DisableInterrupts();
#endif // defined USE_READ_PIN
//--------------------------------------------------------------------------
// Now we may send the data.
//--------------------------------------------------------------------------
// Set READ/!WRITE pin as write (0)
SetRWAsWrite();
// Set DATA/!INSTRUCTION pin as data (1).
SetDIValue( di );
// The data (only high nibble if in 4-bit mode) is output to the data port.
SetDataPortValue( c );
SetDataPortAsOutputs();
// Effectivate the data transfer.
SetEAsEnabled();
// Wait for the minimum 'tHIGH'.
Delay500ns();
// Low half of the trasfer cycle.
SetEAsDisabled();
// Wait for the minimum 'tLOW'.
Delay500ns();
#if defined USE_FOUR_BIT_INTERFACE
// The low nibble is output to the data port.
SetDataPortValueLow( c );
// Effectivate the data transfer.
SetEAsEnabled();
// Wait for the minimum 'tHIGH'.
Delay500ns();
// Low half of the trasfer cycle.
SetEAsDisabled();
// Wait for the minimum 'tLOW'.
Delay500ns();
#endif // defined USE_FOUR_BIT_INTERFACE
SetDataPortAsInputs();
RestoreInterruptsState( Aux );
#if !defined USE_READ_PIN
// If we are not reading the busy flag, then we must wait at least for
// the worst-case execution time before any other command ca be executed.
// This write is a "clear screen" or a "home cursor" command...
if( di == 0 && c <= 3 )
// ... that takes up to 1.52ms to execute.
Delay1520us();
// For all other writes...
else
// ... the execution time is no more than 37us.
Delay37us();
#endif // !defined USE_READ_PIN
}
//==============================================================================
// Reads one data byte from the LCD.
#if defined USE_READ_PIN
static unsigned char LCDReadData( void )
{
// Variable to save the interrupts state at function entry.
DeclareIntSaveVar( Aux );
// Variable to temporarily hold the value read.
unsigned char s;
#if defined DETECT_FAILURE
// Variable to count the number of busy flag reads before an error is signaled.
unsigned short n = NUMBER_OF_READS_TIMEOUT;
// If the display failed previously...
if( displayfailed )
// ... we are not using it until some routine clears the error flag.
return 0x00;
#endif // defined DETECT_FAILURE
SaveInterruptsState( Aux );
// Repeat while busy flag == 1
do
{
RestoreInterruptsState( Aux );
// At this point a pending interrupt may be serviced, so we don't
// block the system for too long. On return, no assumption is
// made about the state of the LCD interface pins, an interrupt
// routine may change the value or direction of any pin, except
// of the ENABLE pin.
DisableInterrupts();
SetDataPortAsInputs();
// Set the READ/!WRITE pin as read (1)
SetRWAsRead();
// Set DATA/!INSTRUCTION pin as instruction (0)
SetDIAsInstruction();
// Effectivate the data transfer.
SetEAsEnabled();
// Wait for the minimum 'tHIGH'.
Delay500ns();
// Read the status byte (only high nibble if in 4-bit mode).
ReadDataPortValue( s );
// Low half of the trasfer cycle.
SetEAsDisabled();
// Wait for the minimum 'tLOW'.
Delay500ns();
#if defined USE_FOUR_BIT_INTERFACE
// When using a 4-bit interface we need to do a dummy read
// Effectivate the data transfer.
SetEAsEnabled();
// Wait for the minimum 'tHIGH'.
Delay500ns();
// Low half of the trasfer cycle.
SetEAsDisabled();
// Wait for the minimum 'tLOW'.
Delay500ns();
#endif // defined USE_FOUR_BIT_INTERFACE
// Set READ/!WRITE pin as write (0)
SetRWAsWrite();
}
// Test the LCD's BUSY flag.
#if !defined DETECT_FAILURE
while( s & 0x80 );
#else // !defined DETECT_FAILURE
while(( s & 0x80 ) && ( --n != 0u ));
if( n == 0u )
displayfailed = 1;
#endif // !defined DETECT_FAILURE
//--------------------------------------------------------------------------
// Now we can read the data.
//--------------------------------------------------------------------------
// Set READ/!WRITE pin as read (1)
SetRWAsRead();
// Set DATA/!INSTRUCTION pin as data (1).
SetDIAsData();
// Effectivate the data transfer.
SetEAsEnabled();
// Wait for the minimum 'tHIGH'.
Delay500ns();
// Read the data byte (only high nibble if in 4-bit mode).
ReadDataPortValue( s );
// Low half of the trasfer cycle.
SetEAsDisabled();
// Wait for the minimum 'tLOW'.
Delay500ns();
#if defined USE_FOUR_BIT_INTERFACE
// Effectivate the data transfer.
SetEAsEnabled();
// Wait for the minimum 'tHIGH'.
Delay500ns();
// Read the data byte (low nibble only).
ReadDataPortValueLow( s );
// Low half of the trasfer cycle.
SetEAsDisabled();
// Wait for the minimum 'tLOW'.
Delay500ns();
#endif // defined USE_FOUR_BIT_INTERFACE
// Set READ/!WRITE pin as write (0)
SetRWAsWrite();
RestoreInterruptsState( Aux );
// Return the read data.
return s;
}
#endif // defined USE_READ_PIN
//==============================================================================
//==============================================================================
//==============================================================================
//==============================================================================
//
//
// Hardware-independent part
//
//
//==============================================================================
//==============================================================================
//==============================================================================
//==============================================================================
//==============================================================================
// Current coordinates of the cursor.
static unsigned char cursorx = 0, cursory = 0;
// Number of columns and lines of the screen.
static unsigned char maxx = INITIAL_MAXX, maxy = INITIAL_MAXY;
//==============================================================================
unsigned char getmaxx( void )
{
return maxx;
}
//==============================================================================
unsigned char getmaxy( void )
{
return maxy;
}
//==============================================================================
unsigned char getcursorx( void )
{
return cursorx + 1;
}
//==============================================================================
unsigned char getcursory( void )
{
return cursory + 1;
}
//==============================================================================
void clrscr( void )
{
// interruptstate_t Aux;
//
// SaveInterruptsState( Aux );
// DisableInterrupts();
// Locate the cursor at the top-left corner of the screen
cursorx = 0;
cursory = 0;
// Send the clear screen command to the LCD controller
LCDWriteCmd( CMD_CLEAR_DISPLAY );
// RestoreInterruptsState( Aux );
}
//==============================================================================
void gotoxy( unsigned char x, unsigned char y )
{
// interruptstate_t Aux;
//
// SaveInterruptsState( Aux );
// DisableInterrupts();
// If the coordinates are valid...
if( x <= maxx && y <= maxy )
{
// If the column is different than zero...
if( x != 0u )
// ... change the current column to it.
cursorx = x - 1;
// If the line is different than zero...
if( y != 0u )
// ... change the current line to it.
cursory = y - 1;
// We need to positon the hardware cursor to the right place.
LCDWriteCmd( CMD_SET_DDRAM_ADDRESS | (( cursory << 6 ) & 0x40 ) | ( cursorx & 0x3f ) + ( cursory & 0x02 ? maxx : 0 ));
}
// RestoreInterruptsState( Aux );
}
//==============================================================================
// This routine's real name is defined in the file 'LCDcfg-lite.h'.
// The name must be chosen to allow the library routines (printf, etc.) to link
// to it.
void LCD_PUTC( char c )
{
// interruptstate_t Aux;
//
// SaveInterruptsState( Aux );
// DisableInterrupts();
switch( c )
{
//----------------------------------------------------------------------
// '\a' = BELL
case '\a':
Beep();
// RestoreInterruptsState( Aux );
return /*0*/;
//----------------------------------------------------------------------
// '\b' = BACKSPACE
case '\b':
// The cursor is not on the first column, ...
if( cursorx > 0u )
// ... decrement the column.
cursorx--;
// The cursor is on the first column but it is not on the first line, ...
else if( cursory > 0u )
{
// ... position the cursor at the end of the previous line.
cursory--;
cursorx = maxx - 1;
}
// The LCD must be updated with the correct cursor coordinates.
LCDWriteCmd( 0x80 | (( cursory << 6 ) & 0x40 ) | ( cursorx & 0x0f ) + ( cursory & 0x02 ? maxx : 0 ));
// ... finished.
// RestoreInterruptsState( Aux );
return /*0*/;
//----------------------------------------------------------------------
// '\f' = FORMFEED
case '\f':
// Clear the screen.
// Locate the cursor at the top-left corner of the screen
cursorx = 0;
cursory = 0;
// Send the clear screen command to the LCD controller
LCDWriteCmd( CMD_CLEAR_DISPLAY );
// RestoreInterruptsState( Aux );
return /*0*/;
//----------------------------------------------------------------------
// '\n' = NEWLINE
case '\n':
// Return the cursor to the beginning of the line.
cursorx = 0;
// Fall-through to 'VTAB', to increment the line
//----------------------------------------------------------------------
// '\v' = VTAB
case '\v':
// Increment the line number.
cursory++;
// Outside the 'switch' we will check if a wrap-around is needed.
break;
//----------------------------------------------------------------------
// '\r' = CR (carriage return)
case '\r':
// Return the cursor to the beginning of the line.
cursorx = 0;
// The LCD must be updated with the correct cursor coordinates.
LCDWriteCmd( 0x80 | (( cursory << 6 ) & 0x40 ) | ( cursorx & 0x0f ) + ( cursory & 0x02 ? maxx : 0 ));
// Fim
// RestoreInterruptsState( Aux );
return /*0*/;
//----------------------------------------------------------------------
// Aqui tratamos do caractere tabulação ('\t' = TAB)
case '\t':
{
// We need a temporary variable.
unsigned char Temp;
// Calculate the column of the next tabulation.
Temp = ( cursorx + TAB_WIDTH ) & ~( TAB_WIDTH - 1 );
// The cursor will be beyond the column after the last, ...
if( Temp > maxx )
// ... restrict the cursor to the column after the last.
Temp = maxx;
// Calculate how many spaces must be inserted.
Temp -= cursorx;
// Advance the column to its final position.
cursorx += Temp;
// Print as many spaces as needed to reach the final position
for( ; Temp; Temp-- )
LCDWriteData( ' ' );
// The cursor ended beyond the last column, ...
if( cursorx >= maxx )
{
// ... position the cursor to the beginning of the next line.
cursorx = 0;
cursory++;
// Outside the 'switch' we will check if a wrap-around is needed.
break;
}
// The cursor is yet on the same line, we may return right now.
// RestoreInterruptsState( Aux );
return /*0*/;
}
//----------------------------------------------------------------------
// Here we cope with the printable characters.
default:
// Print the character.
LCDWriteData( c );
// Increment the column.
cursorx++;
// The cursor ended beyond the last column, ...
if( cursorx >= maxx )
{
// ... position the cursor to the beginning of the next line.
cursorx = 0;
cursory++;
// Outside the 'switch' we will check if a wrap-around is needed.
break;
}
// The cursor is yet on the same line, we may return right now.
// RestoreInterruptsState( Aux );
return /*0*/;
}
//--------------------------------------------------------------------------
// The cursor is beyond the last line, ...
if( cursory >= maxy )
// ... position it on the last line...
cursory = 0;
// We must position the LCD cursor on the right place.
LCDWriteCmd( 0x80 | (( cursory << 6 ) & 0x40 ) | ( cursorx & 0x0f ) + ( cursory & 0x02 ? maxx : 0 ));
//--------------------------------------------------------------------------
// RestoreInterruptsState( Aux );
return /*0*/;
}
//==============================================================================
/*
void LCDControlCursor( unsigned char Mode )
{
LCDWriteCmd(( Mode & 0x03 ) | 0x0c );
}
//==============================================================================
void LCDDefineChar( unsigned char Char, const unsigned char *Pattern )
{
unsigned char c;
LCDWriteCmd((( Char << 3 ) & 0x38 ) | 0x40 );
for( c = 8; c; c-- )
LCDWriteData( *Pattern++ );
LCDWriteCmd( 0x80 | (( cursory << 6 ) & 0x40 ) | ( cursorx & 0x3f ) + ( cursory & 0x02 ? maxx : 0 ));
}
*/
//==============================================================================
void LCDInit( void )
{
// Initialize the LCD data interface.
// The initial value of the LCD's ENABLE pin is 0 (disabled).
SetEAsDisabled();
// The LCD's ENABLE pin is an output.
SetEAsOutput();
// The initial value of the LCD's READ/!WRITE pin is 0 (write).
SetRWAsWrite();
// The LCD's READ/!WRITE pin is an output.
SetRWAsOutput();
// The initial value of the LCD's DATA/!INSTRUCTION pin is 0 (data).
SetDIAsInstruction();
// The LCD's DATA/!INSTRUCTION pin is an output.
SetDIAsOutput();
// Chip initialization, following data-sheet procedure.
// Delay mandated by the data-sheet
// "Wait for more than 15 ms after VCC rises to 4.5 V."
// or
// "Wait for more than 40 ms after VCC rises to 2.7 V."
Delay15ms();
// Value to set the LCD interface to 8 bits, irrespective of the real board
// interface length.
SetDataPortValue( 0x30 );
SetDataPortAsOutputs();
// The command to change the interface to 8 bits must be issued 3 times.
// Issue the command (first time).
SetEAsEnabled();
// Wait for the minimum 'tHIGH'.
Delay500ns();
// Low half of the trasfer cycle.
SetEAsDisabled();
// Delay mandated by the data-sheet
// "Wait for more than 4.1 ms."
Delay4100us();
// Issue the command (second time).
SetEAsEnabled();
// Wait for the minimum 'tHIGH'.
Delay500ns();
// Low half of the trasfer cycle.
SetEAsDisabled();
// Delay mandated by the data-sheet
// "Wait for more than 100 µs."
Delay100us();
// Issue the command (third time).
SetEAsEnabled();
// Wait for the minimum 'tHIGH'.
Delay500ns();
// Low half of the trasfer cycle.
SetEAsDisabled();
#if !defined USE_READ_PIN
// Wait for the execution time.
Delay37us();
#endif // !defined USE_READ_PIN
// Set the correct interface length
#if defined USE_FOUR_BIT_INTERFACE
// "Function set (Set interface to be 4 bits long.) Interface is 8 bits in length."
LCDWriteCmd( 0x28 );
#else // defined USE_FOUR_BIT_INTERFACE
// "Function set (Interface is 8 bits long.)"
LCDWriteCmd( 0x38 );
#endif // defined USE_FOUR_BIT_INTERFACE
// Turn display on
LCDWriteCmd( 0x0c );
// Clear display
LCDWriteCmd( CMD_CLEAR_DISPLAY );
}
//==============================================================================
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Isaac Marino Bavaresco[IMB-yahoo-J86] edited the page. Difference:
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ON 20100428@5:24:28 PM at page:
On a web page you were interested in at:
http://www.piclist.com/techref/member/IMB-yahoo-J86/lcd-lite.c.htm#
Isaac Marino Bavaresco[IMB-yahoo-J86] edited the page. Difference:
http://www.piclist.com/techref/diff.asp?url=H:\techref\member\IMB-yahoo-J86\lcd-lite.c.htm&version=0