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/*! \file lcdconf.h \brief Character LCD driver configuration. */ |
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//***************************************************************************** |
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// |
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// File Name : 'lcdconf.h' |
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// Title : Character LCD driver for HD44780/SED1278 displays |
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// (usable in mem-mapped, or I/O mode) |
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// Author : Pascal Stang - Copyright (C) 2000-2002 |
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// Created : 11/22/2000 |
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// Revised : 4/30/2002 |
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// Version : 1.1 |
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// Target MCU : Atmel AVR series |
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// Editor Tabs : 4 |
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// |
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// This code is distributed under the GNU Public License |
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// which can be found at http://www.gnu.org/licenses/gpl.txt |
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// |
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//***************************************************************************** |
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#ifndef LCDCONF_H |
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#define LCDCONF_H |
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// Define type of interface used to access the LCD |
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// LCD_MEMORY_INTERFACE: |
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// To use this mode you must supply the necessary hardware to connect the |
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// LCD to the CPU's memory bus. The CONTROL and DATA registers of the LCD |
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// (HD44780 chip) must appear in the CPU's memory map. This mode is faster |
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// than the port interface but requires a little extra hardware to make it |
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// work. It is especially useful when your CPU is already configured to |
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// use an external memory bus for other purposes (like accessing memory). |
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// |
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// LCD_PORT_INTERFACE: |
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// This mode allows you to connect the control and data lines of the LCD |
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// directly to the I/O port pins (no interfacing hardware is needed), |
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// but it generally runs slower than the LCD_MEMORY_INTERFACE. |
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// Depending on your needs, when using the LCD_PORT_INTERFACE, the LCD may |
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// be accessed in 8-bit or 4-bit mode. In 8-bit mode, one whole I/O port |
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// (pins 0-7) is required for the LCD data lines, but transfers are faster. |
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// In 4-bit mode, only I/O port pins 4-7 are needed for data lines, but LCD |
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// access is slower. In either mode, three additional port pins are |
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// required for the LCD interface control lines (RS, R/W, and E). |
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// Enable one of the following interfaces to your LCD |
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//#define LCD_MEMORY_INTERFACE |
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#define LCD_PORT_INTERFACE |
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// Enter the parameters for your chosen interface' |
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// if you chose the LCD_PORT_INTERFACE: |
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#ifdef LCD_PORT_INTERFACE |
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#ifndef LCD_CTRL_PORT |
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// port and pins you will use for control lines |
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#define LCD_CTRL_PORT PORTC |
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#define LCD_CTRL_DDR DDRC |
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#define LCD_CTRL_RS 2 |
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#define LCD_CTRL_RW 3 |
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#define LCD_CTRL_E 4 |
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#endif |
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#ifndef LCD_DATA_POUT |
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// port you will use for data lines |
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#define LCD_DATA_POUT PORTA |
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#define LCD_DATA_PIN PINA |
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#define LCD_DATA_DDR DDRA |
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// access mode you will use (default is 8bit unless 4bit is selected) |
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#define LCD_DATA_4BIT |
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#endif |
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#endif |
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// if you chose the LCD_MEMORY_INTERFACE: |
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#ifdef LCD_MEMORY_INTERFACE |
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#ifndef LCD_CTRL_ADDR |
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// CPU memory address of the LCD control register |
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#define LCD_CTRL_ADDR 0x1000 |
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#endif |
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#ifndef LCD_DATA_ADDR |
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// CPU memory address of the LCD data register |
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#define LCD_DATA_ADDR 0x1001 |
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#endif |
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#endif |
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// LCD display geometry |
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// change these definitions to adapt settings |
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#define LCD_LINES 2 // visible lines |
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#define LCD_LINE_LENGTH 16 // line length (in characters) |
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// cursor position to DDRAM mapping |
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#define LCD_LINE0_DDRAMADDR 0x00 |
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#define LCD_LINE1_DDRAMADDR 0x40 |
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#define LCD_LINE2_DDRAMADDR 0x14 |
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#define LCD_LINE3_DDRAMADDR 0x54 |
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// LCD delay |
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// This delay affects how quickly accesses are made to the LCD controller. |
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// The HD44780 LCD controller requires an access time of at least 1us. |
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// LCD_DELAY should be scaled to take at least half that time (500us). |
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// Each NOP takes 1 CPU clock cycle to execute. Thus, at 4MHz, you should |
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// use at least 2 NOPs, at 8MHz at least 4 NOPs, etc. |
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// You can also use the delay_us(xx) command for longer access times. |
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// LCD_DELAY is now automatically set in lcd.h, |
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// however, if you define it here, this definition will override the automatic setting |
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// use this for a fail-safe delay |
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//#define LCD_DELAY delay_us(5); |
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#endif |