mirror of
https://github.com/arduino/Arduino.git
synced 2024-12-02 13:24:12 +01:00
98 lines
3.6 KiB
C
Executable File
98 lines
3.6 KiB
C
Executable File
/*! \file lcdconf.h \brief Character LCD driver configuration. */
|
|
//*****************************************************************************
|
|
//
|
|
// File Name : 'lcdconf.h'
|
|
// Title : Character LCD driver for HD44780/SED1278 displays
|
|
// (usable in mem-mapped, or I/O mode)
|
|
// Author : Pascal Stang - Copyright (C) 2000-2002
|
|
// Created : 11/22/2000
|
|
// Revised : 4/30/2002
|
|
// Version : 1.1
|
|
// Target MCU : Atmel AVR series
|
|
// Editor Tabs : 4
|
|
//
|
|
// This code is distributed under the GNU Public License
|
|
// which can be found at http://www.gnu.org/licenses/gpl.txt
|
|
//
|
|
//*****************************************************************************
|
|
|
|
#ifndef LCDCONF_H
|
|
#define LCDCONF_H
|
|
|
|
// Define type of interface used to access the LCD
|
|
// LCD_MEMORY_INTERFACE:
|
|
// To use this mode you must supply the necessary hardware to connect the
|
|
// LCD to the CPU's memory bus. The CONTROL and DATA registers of the LCD
|
|
// (HD44780 chip) must appear in the CPU's memory map. This mode is faster
|
|
// than the port interface but requires a little extra hardware to make it
|
|
// work. It is especially useful when your CPU is already configured to
|
|
// use an external memory bus for other purposes (like accessing memory).
|
|
//
|
|
// LCD_PORT_INTERFACE:
|
|
// This mode allows you to connect the control and data lines of the LCD
|
|
// directly to the I/O port pins (no interfacing hardware is needed),
|
|
// but it generally runs slower than the LCD_MEMORY_INTERFACE.
|
|
// Depending on your needs, when using the LCD_PORT_INTERFACE, the LCD may
|
|
// be accessed in 8-bit or 4-bit mode. In 8-bit mode, one whole I/O port
|
|
// (pins 0-7) is required for the LCD data lines, but transfers are faster.
|
|
// In 4-bit mode, only I/O port pins 4-7 are needed for data lines, but LCD
|
|
// access is slower. In either mode, three additional port pins are
|
|
// required for the LCD interface control lines (RS, R/W, and E).
|
|
|
|
// Enable one of the following interfaces to your LCD
|
|
//#define LCD_MEMORY_INTERFACE
|
|
#define LCD_PORT_INTERFACE
|
|
|
|
// Enter the parameters for your chosen interface'
|
|
// if you chose the LCD_PORT_INTERFACE:
|
|
#ifdef LCD_PORT_INTERFACE
|
|
#ifndef LCD_CTRL_PORT
|
|
// port and pins you will use for control lines
|
|
#define LCD_CTRL_PORT PORTC
|
|
#define LCD_CTRL_DDR DDRC
|
|
#define LCD_CTRL_RS 2
|
|
#define LCD_CTRL_RW 3
|
|
#define LCD_CTRL_E 4
|
|
#endif
|
|
#ifndef LCD_DATA_POUT
|
|
// port you will use for data lines
|
|
#define LCD_DATA_POUT PORTA
|
|
#define LCD_DATA_PIN PINA
|
|
#define LCD_DATA_DDR DDRA
|
|
// access mode you will use (default is 8bit unless 4bit is selected)
|
|
//#define LCD_DATA_4BIT
|
|
#endif
|
|
#endif
|
|
|
|
// if you chose the LCD_MEMORY_INTERFACE:
|
|
#ifdef LCD_MEMORY_INTERFACE
|
|
#ifndef LCD_CTRL_ADDR
|
|
// CPU memory address of the LCD control register
|
|
#define LCD_CTRL_ADDR 0x1000
|
|
#endif
|
|
#ifndef LCD_DATA_ADDR
|
|
// CPU memory address of the LCD data register
|
|
#define LCD_DATA_ADDR 0x1001
|
|
#endif
|
|
#endif
|
|
|
|
|
|
// LCD display geometry
|
|
// change these definitions to adapt settings
|
|
#define LCD_LINES 4 // visible lines
|
|
#define LCD_LINE_LENGTH 20 // line length (in characters)
|
|
// cursor position to DDRAM mapping
|
|
#define LCD_LINE0_DDRAMADDR 0x00
|
|
#define LCD_LINE1_DDRAMADDR 0x40
|
|
#define LCD_LINE2_DDRAMADDR 0x14
|
|
#define LCD_LINE3_DDRAMADDR 0x54
|
|
|
|
// LCD delay
|
|
// This delay affects how quickly accesses are made to the LCD controller.
|
|
// If your clock frequency is low, you can reduce the number of NOPs in the
|
|
// delay. If your clock frequency is high, you may need to add NOPs.
|
|
// The number of NOPs should be between at least 1 and up to 20.
|
|
#define LCD_DELAY asm volatile ("nop\n nop\n nop\n nop\n");
|
|
|
|
#endif
|