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10 <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>
11 00002 <span class="comment">//*****************************************************************************</span>
12 00003 <span class="comment">//</span>
13 00004 <span class="comment">// File Name : 'lcdconf.h'</span>
14 00005 <span class="comment">// Title : Character LCD driver for HD44780/SED1278 displays</span>
15 00006 <span class="comment">// (usable in mem-mapped, or I/O mode)</span>
16 00007 <span class="comment">// Author : Pascal Stang - Copyright (C) 2000-2002</span>
17 00008 <span class="comment">// Created : 11/22/2000</span>
18 00009 <span class="comment">// Revised : 4/30/2002</span>
19 00010 <span class="comment">// Version : 1.1</span>
20 00011 <span class="comment">// Target MCU : Atmel AVR series</span>
21 00012 <span class="comment">// Editor Tabs : 4</span>
22 00013 <span class="comment">//</span>
23 00014 <span class="comment">// This code is distributed under the GNU Public License</span>
24 00015 <span class="comment">// which can be found at http://www.gnu.org/licenses/gpl.txt</span>
25 00016 <span class="comment">//</span>
26 00017 <span class="comment">//*****************************************************************************</span>
27 00018
28 00019 <span class="preprocessor">#ifndef LCDCONF_H</span>
29 00020 <span class="preprocessor"></span><span class="preprocessor">#define LCDCONF_H</span>
30 00021 <span class="preprocessor"></span>
31 00022 <span class="comment">// Define type of interface used to access the LCD</span>
32 00023 <span class="comment">// LCD_MEMORY_INTERFACE:</span>
33 00024 <span class="comment">// To use this mode you must supply the necessary hardware to connect the</span>
34 00025 <span class="comment">// LCD to the CPU's memory bus. The CONTROL and DATA registers of the LCD</span>
35 00026 <span class="comment">// (HD44780 chip) must appear in the CPU's memory map. This mode is faster</span>
36 00027 <span class="comment">// than the port interface but requires a little extra hardware to make it</span>
37 00028 <span class="comment">// work. It is especially useful when your CPU is already configured to</span>
38 00029 <span class="comment">// use an external memory bus for other purposes (like accessing memory).</span>
39 00030 <span class="comment">//</span>
40 00031 <span class="comment">// LCD_PORT_INTERFACE:</span>
41 00032 <span class="comment">// This mode allows you to connect the control and data lines of the LCD</span>
42 00033 <span class="comment">// directly to the I/O port pins (no interfacing hardware is needed),</span>
43 00034 <span class="comment">// but it generally runs slower than the LCD_MEMORY_INTERFACE.</span>
44 00035 <span class="comment">// Depending on your needs, when using the LCD_PORT_INTERFACE, the LCD may</span>
45 00036 <span class="comment">// be accessed in 8-bit or 4-bit mode. In 8-bit mode, one whole I/O port</span>
46 00037 <span class="comment">// (pins 0-7) is required for the LCD data lines, but transfers are faster.</span>
47 00038 <span class="comment">// In 4-bit mode, only I/O port pins 4-7 are needed for data lines, but LCD</span>
48 00039 <span class="comment">// access is slower. In either mode, three additional port pins are</span>
49 00040 <span class="comment">// required for the LCD interface control lines (RS, R/W, and E).</span>
50 00041
51 00042 <span class="comment">// Enable one of the following interfaces to your LCD</span>
52 00043 <span class="comment">//#define LCD_MEMORY_INTERFACE</span>
53 00044 <span class="preprocessor">#define LCD_PORT_INTERFACE</span>
54 00045 <span class="preprocessor"></span>
55 00046 <span class="comment">// Enter the parameters for your chosen interface'</span>
56 00047 <span class="comment">// if you chose the LCD_PORT_INTERFACE:</span>
57 00048 <span class="preprocessor">#ifdef LCD_PORT_INTERFACE</span>
58 00049 <span class="preprocessor"></span><span class="preprocessor"> #ifndef LCD_CTRL_PORT</span>
59 00050 <span class="preprocessor"></span> <span class="comment">// port and pins you will use for control lines</span>
60 00051 <span class="preprocessor"> #define LCD_CTRL_PORT PORTC</span>
61 00052 <span class="preprocessor"></span><span class="preprocessor"> #define LCD_CTRL_DDR DDRC</span>
62 00053 <span class="preprocessor"></span><span class="preprocessor"> #define LCD_CTRL_RS 2</span>
63 00054 <span class="preprocessor"></span><span class="preprocessor"> #define LCD_CTRL_RW 3</span>
64 00055 <span class="preprocessor"></span><span class="preprocessor"> #define LCD_CTRL_E 4</span>
65 00056 <span class="preprocessor"></span><span class="preprocessor"> #endif</span>
66 00057 <span class="preprocessor"></span><span class="preprocessor"> #ifndef LCD_DATA_POUT</span>
67 00058 <span class="preprocessor"></span> <span class="comment">// port you will use for data lines</span>
68 00059 <span class="preprocessor"> #define LCD_DATA_POUT PORTA</span>
69 00060 <span class="preprocessor"></span><span class="preprocessor"> #define LCD_DATA_PIN PINA</span>
70 00061 <span class="preprocessor"></span><span class="preprocessor"> #define LCD_DATA_DDR DDRA</span>
71 00062 <span class="preprocessor"></span> <span class="comment">// access mode you will use (default is 8bit unless 4bit is selected)</span>
72 00063 <span class="comment">//#define LCD_DATA_4BIT</span>
73 00064 <span class="preprocessor"> #endif</span>
74 00065 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
75 00066 <span class="preprocessor"></span>
76 00067 <span class="comment">// if you chose the LCD_MEMORY_INTERFACE:</span>
77 00068 <span class="preprocessor">#ifdef LCD_MEMORY_INTERFACE</span>
78 00069 <span class="preprocessor"></span><span class="preprocessor"> #ifndef LCD_CTRL_ADDR</span>
79 00070 <span class="preprocessor"></span> <span class="comment">// CPU memory address of the LCD control register</span>
80 00071 <span class="preprocessor"> #define LCD_CTRL_ADDR 0x1000</span>
81 00072 <span class="preprocessor"></span><span class="preprocessor"> #endif</span>
82 00073 <span class="preprocessor"></span><span class="preprocessor"> #ifndef LCD_DATA_ADDR</span>
83 00074 <span class="preprocessor"></span> <span class="comment">// CPU memory address of the LCD data register</span>
84 00075 <span class="preprocessor"> #define LCD_DATA_ADDR 0x1001</span>
85 00076 <span class="preprocessor"></span><span class="preprocessor"> #endif</span>
86 00077 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
87 00078 <span class="preprocessor"></span>
88 00079
89 00080 <span class="comment">// LCD display geometry</span>
90 00081 <span class="comment">// change these definitions to adapt settings</span>
91 00082 <span class="preprocessor">#define LCD_LINES 4 // visible lines</span>
92 00083 <span class="preprocessor"></span><span class="preprocessor">#define LCD_LINE_LENGTH 20 // line length (in characters)</span>
93 00084 <span class="preprocessor"></span><span class="comment">// cursor position to DDRAM mapping</span>
94 00085 <span class="preprocessor">#define LCD_LINE0_DDRAMADDR 0x00</span>
95 00086 <span class="preprocessor"></span><span class="preprocessor">#define LCD_LINE1_DDRAMADDR 0x40</span>
96 00087 <span class="preprocessor"></span><span class="preprocessor">#define LCD_LINE2_DDRAMADDR 0x14</span>
97 00088 <span class="preprocessor"></span><span class="preprocessor">#define LCD_LINE3_DDRAMADDR 0x54</span>
98 00089 <span class="preprocessor"></span>
99 00090 <span class="comment">// LCD delay</span>
100 00091 <span class="comment">// This delay affects how quickly accesses are made to the LCD controller.</span>
101 00092 <span class="comment">// The HD44780 LCD controller requires an access time of at least 1us.</span>
102 00093 <span class="comment">// LCD_DELAY should be scaled to take at least half that time (500us).</span>
103 00094 <span class="comment">// Each NOP takes 1 CPU clock cycle to execute. Thus, at 4MHz, you should</span>
104 00095 <span class="comment">// use at least 2 NOPs, at 8MHz at least 4 NOPs, etc.</span>
105 00096 <span class="comment">// You can also use the delay_us(xx) command for longer access times.</span>
106 00097
107 00098 <span class="comment">// LCD_DELAY is now automatically set in lcd.h,</span>
108 00099 <span class="comment">// however, if you define it here, this definition will override the automatic setting</span>
109 00100
110 00101 <span class="comment">// use this for a fail-safe delay</span>
111 00102 <span class="comment">//#define LCD_DELAY delay_us(5);</span>
112 00103
113 00104 <span class="preprocessor">#endif</span>
114 </pre></div><hr size="1"><address style="align: right;"><small>Generated on Sun Oct 29 03:41:06 2006 for Procyon AVRlib by&nbsp;
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