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<h1>lcdconf.h</h1><a href="lcdconf_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001 <span class="comment">/*! \file lcdconf.h \brief Character LCD driver configuration. */</span>
00002 <span class="comment">//*****************************************************************************</span>
00003 <span class="comment">//</span>
00004 <span class="comment">// File Name : 'lcdconf.h'</span>
00005 <span class="comment">// Title : Character LCD driver for HD44780/SED1278 displays</span>
00006 <span class="comment">// (usable in mem-mapped, or I/O mode)</span>
00007 <span class="comment">// Author : Pascal Stang - Copyright (C) 2000-2002</span>
00008 <span class="comment">// Created : 11/22/2000</span>
00009 <span class="comment">// Revised : 4/30/2002</span>
00010 <span class="comment">// Version : 1.1</span>
00011 <span class="comment">// Target MCU : Atmel AVR series</span>
00012 <span class="comment">// Editor Tabs : 4</span>
00013 <span class="comment">//</span>
00014 <span class="comment">// This code is distributed under the GNU Public License</span>
00015 <span class="comment">// which can be found at http://www.gnu.org/licenses/gpl.txt</span>
00016 <span class="comment">//</span>
00017 <span class="comment">//*****************************************************************************</span>
00018
00019 <span class="preprocessor">#ifndef LCDCONF_H</span>
00020 <span class="preprocessor"></span><span class="preprocessor">#define LCDCONF_H</span>
00021 <span class="preprocessor"></span>
00022 <span class="comment">// Define type of interface used to access the LCD</span>
00023 <span class="comment">// LCD_MEMORY_INTERFACE:</span>
00024 <span class="comment">// To use this mode you must supply the necessary hardware to connect the</span>
00025 <span class="comment">// LCD to the CPU's memory bus. The CONTROL and DATA registers of the LCD</span>
00026 <span class="comment">// (HD44780 chip) must appear in the CPU's memory map. This mode is faster</span>
00027 <span class="comment">// than the port interface but requires a little extra hardware to make it</span>
00028 <span class="comment">// work. It is especially useful when your CPU is already configured to</span>
00029 <span class="comment">// use an external memory bus for other purposes (like accessing memory).</span>
00030 <span class="comment">//</span>
00031 <span class="comment">// LCD_PORT_INTERFACE:</span>
00032 <span class="comment">// This mode allows you to connect the control and data lines of the LCD</span>
00033 <span class="comment">// directly to the I/O port pins (no interfacing hardware is needed),</span>
00034 <span class="comment">// but it generally runs slower than the LCD_MEMORY_INTERFACE.</span>
00035 <span class="comment">// Depending on your needs, when using the LCD_PORT_INTERFACE, the LCD may</span>
00036 <span class="comment">// be accessed in 8-bit or 4-bit mode. In 8-bit mode, one whole I/O port</span>
00037 <span class="comment">// (pins 0-7) is required for the LCD data lines, but transfers are faster.</span>
00038 <span class="comment">// In 4-bit mode, only I/O port pins 4-7 are needed for data lines, but LCD</span>
00039 <span class="comment">// access is slower. In either mode, three additional port pins are</span>
00040 <span class="comment">// required for the LCD interface control lines (RS, R/W, and E).</span>
00041
00042 <span class="comment">// Enable one of the following interfaces to your LCD</span>
00043 <span class="comment">//#define LCD_MEMORY_INTERFACE</span>
00044 <span class="preprocessor">#define LCD_PORT_INTERFACE</span>
00045 <span class="preprocessor"></span>
00046 <span class="comment">// Enter the parameters for your chosen interface'</span>
00047 <span class="comment">// if you chose the LCD_PORT_INTERFACE:</span>
00048 <span class="preprocessor">#ifdef LCD_PORT_INTERFACE</span>
00049 <span class="preprocessor"></span><span class="preprocessor"> #ifndef LCD_CTRL_PORT</span>
00050 <span class="preprocessor"></span> <span class="comment">// port and pins you will use for control lines</span>
00051 <span class="preprocessor"> #define LCD_CTRL_PORT PORTC</span>
00052 <span class="preprocessor"></span><span class="preprocessor"> #define LCD_CTRL_DDR DDRC</span>
00053 <span class="preprocessor"></span><span class="preprocessor"> #define LCD_CTRL_RS 2</span>
00054 <span class="preprocessor"></span><span class="preprocessor"> #define LCD_CTRL_RW 3</span>
00055 <span class="preprocessor"></span><span class="preprocessor"> #define LCD_CTRL_E 4</span>
00056 <span class="preprocessor"></span><span class="preprocessor"> #endif</span>
00057 <span class="preprocessor"></span><span class="preprocessor"> #ifndef LCD_DATA_POUT</span>
00058 <span class="preprocessor"></span> <span class="comment">// port you will use for data lines</span>
00059 <span class="preprocessor"> #define LCD_DATA_POUT PORTA</span>
00060 <span class="preprocessor"></span><span class="preprocessor"> #define LCD_DATA_PIN PINA</span>
00061 <span class="preprocessor"></span><span class="preprocessor"> #define LCD_DATA_DDR DDRA</span>
00062 <span class="preprocessor"></span> <span class="comment">// access mode you will use (default is 8bit unless 4bit is selected)</span>
00063 <span class="comment">//#define LCD_DATA_4BIT</span>
00064 <span class="preprocessor"> #endif</span>
00065 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
00066 <span class="preprocessor"></span>
00067 <span class="comment">// if you chose the LCD_MEMORY_INTERFACE:</span>
00068 <span class="preprocessor">#ifdef LCD_MEMORY_INTERFACE</span>
00069 <span class="preprocessor"></span><span class="preprocessor"> #ifndef LCD_CTRL_ADDR</span>
00070 <span class="preprocessor"></span> <span class="comment">// CPU memory address of the LCD control register</span>
00071 <span class="preprocessor"> #define LCD_CTRL_ADDR 0x1000</span>
00072 <span class="preprocessor"></span><span class="preprocessor"> #endif</span>
00073 <span class="preprocessor"></span><span class="preprocessor"> #ifndef LCD_DATA_ADDR</span>
00074 <span class="preprocessor"></span> <span class="comment">// CPU memory address of the LCD data register</span>
00075 <span class="preprocessor"> #define LCD_DATA_ADDR 0x1001</span>
00076 <span class="preprocessor"></span><span class="preprocessor"> #endif</span>
00077 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
00078 <span class="preprocessor"></span>
00079
00080 <span class="comment">// LCD display geometry</span>
00081 <span class="comment">// change these definitions to adapt settings</span>
00082 <span class="preprocessor">#define LCD_LINES 4 // visible lines</span>
00083 <span class="preprocessor"></span><span class="preprocessor">#define LCD_LINE_LENGTH 20 // line length (in characters)</span>
00084 <span class="preprocessor"></span><span class="comment">// cursor position to DDRAM mapping</span>
00085 <span class="preprocessor">#define LCD_LINE0_DDRAMADDR 0x00</span>
00086 <span class="preprocessor"></span><span class="preprocessor">#define LCD_LINE1_DDRAMADDR 0x40</span>
00087 <span class="preprocessor"></span><span class="preprocessor">#define LCD_LINE2_DDRAMADDR 0x14</span>
00088 <span class="preprocessor"></span><span class="preprocessor">#define LCD_LINE3_DDRAMADDR 0x54</span>
00089 <span class="preprocessor"></span>
00090 <span class="comment">// LCD delay</span>
00091 <span class="comment">// This delay affects how quickly accesses are made to the LCD controller.</span>
00092 <span class="comment">// The HD44780 LCD controller requires an access time of at least 1us.</span>
00093 <span class="comment">// LCD_DELAY should be scaled to take at least half that time (500us).</span>
00094 <span class="comment">// Each NOP takes 1 CPU clock cycle to execute. Thus, at 4MHz, you should</span>
00095 <span class="comment">// use at least 2 NOPs, at 8MHz at least 4 NOPs, etc.</span>
00096 <span class="comment">// You can also use the delay_us(xx) command for longer access times.</span>
00097
00098 <span class="comment">// LCD_DELAY is now automatically set in lcd.h,</span>
00099 <span class="comment">// however, if you define it here, this definition will override the automatic setting</span>
00100
00101 <span class="comment">// use this for a fail-safe delay</span>
00102 <span class="comment">//#define LCD_DELAY delay_us(5);</span>
00103
00104 <span class="preprocessor">#endif</span>
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