blob: 2caeea5e49932e1c3e132a55794373c3fe65dbad [file] [log] [blame]
Miguel Ojeda Sandonis70e84042007-02-10 01:44:32 -08001/*
2 * Filename: cfag12864b-example.c
3 * Version: 0.1.0
4 * Description: cfag12864b LCD userspace example program
5 * License: GPLv2
6 *
Miguel Ojeda450c6222008-07-04 09:59:33 -07007 * Author: Copyright (C) Miguel Ojeda Sandonis
Miguel Ojeda Sandonis70e84042007-02-10 01:44:32 -08008 * Date: 2006-10-31
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 *
23 */
24
25/*
26 * ------------------------
27 * start of cfag12864b code
28 * ------------------------
29 */
30
31#include <string.h>
32#include <fcntl.h>
33#include <unistd.h>
34#include <sys/types.h>
35#include <sys/stat.h>
36#include <sys/mman.h>
37
38#define CFAG12864B_WIDTH (128)
39#define CFAG12864B_HEIGHT (64)
40#define CFAG12864B_SIZE (128 * 64 / 8)
41#define CFAG12864B_BPB (8)
42#define CFAG12864B_ADDRESS(x, y) ((y) * CFAG12864B_WIDTH / \
43 CFAG12864B_BPB + (x) / CFAG12864B_BPB)
44#define CFAG12864B_BIT(n) (((unsigned char) 1) << (n))
45
46#undef CFAG12864B_DOCHECK
47#ifdef CFAG12864B_DOCHECK
48 #define CFAG12864B_CHECK(x, y) ((x) < CFAG12864B_WIDTH && \
49 (y) < CFAG12864B_HEIGHT)
50#else
51 #define CFAG12864B_CHECK(x, y) (1)
52#endif
53
54int cfag12864b_fd;
55unsigned char * cfag12864b_mem;
56unsigned char cfag12864b_buffer[CFAG12864B_SIZE];
57
58/*
59 * init a cfag12864b framebuffer device
60 *
61 * No error: return = 0
62 * Unable to open: return = -1
63 * Unable to mmap: return = -2
64 */
65int cfag12864b_init(char *path)
66{
67 cfag12864b_fd = open(path, O_RDWR);
68 if (cfag12864b_fd == -1)
69 return -1;
70
71 cfag12864b_mem = mmap(0, CFAG12864B_SIZE, PROT_READ | PROT_WRITE,
72 MAP_SHARED, cfag12864b_fd, 0);
73 if (cfag12864b_mem == MAP_FAILED) {
74 close(cfag12864b_fd);
75 return -2;
76 }
77
78 return 0;
79}
80
81/*
82 * exit a cfag12864b framebuffer device
83 */
84void cfag12864b_exit(void)
85{
86 munmap(cfag12864b_mem, CFAG12864B_SIZE);
87 close(cfag12864b_fd);
88}
89
90/*
91 * set (x, y) pixel
92 */
93void cfag12864b_set(unsigned char x, unsigned char y)
94{
95 if (CFAG12864B_CHECK(x, y))
96 cfag12864b_buffer[CFAG12864B_ADDRESS(x, y)] |=
97 CFAG12864B_BIT(x % CFAG12864B_BPB);
98}
99
100/*
101 * unset (x, y) pixel
102 */
103void cfag12864b_unset(unsigned char x, unsigned char y)
104{
105 if (CFAG12864B_CHECK(x, y))
106 cfag12864b_buffer[CFAG12864B_ADDRESS(x, y)] &=
107 ~CFAG12864B_BIT(x % CFAG12864B_BPB);
108}
109
110/*
111 * is set (x, y) pixel?
112 *
113 * Pixel off: return = 0
114 * Pixel on: return = 1
115 */
116unsigned char cfag12864b_isset(unsigned char x, unsigned char y)
117{
118 if (CFAG12864B_CHECK(x, y))
119 if (cfag12864b_buffer[CFAG12864B_ADDRESS(x, y)] &
120 CFAG12864B_BIT(x % CFAG12864B_BPB))
121 return 1;
122
123 return 0;
124}
125
126/*
127 * not (x, y) pixel
128 */
129void cfag12864b_not(unsigned char x, unsigned char y)
130{
131 if (cfag12864b_isset(x, y))
132 cfag12864b_unset(x, y);
133 else
134 cfag12864b_set(x, y);
135}
136
137/*
138 * fill (set all pixels)
139 */
140void cfag12864b_fill(void)
141{
142 unsigned short i;
143
144 for (i = 0; i < CFAG12864B_SIZE; i++)
145 cfag12864b_buffer[i] = 0xFF;
146}
147
148/*
149 * clear (unset all pixels)
150 */
151void cfag12864b_clear(void)
152{
153 unsigned short i;
154
155 for (i = 0; i < CFAG12864B_SIZE; i++)
156 cfag12864b_buffer[i] = 0;
157}
158
159/*
160 * format a [128*64] matrix
161 *
162 * Pixel off: src[i] = 0
163 * Pixel on: src[i] > 0
164 */
165void cfag12864b_format(unsigned char * matrix)
166{
167 unsigned char i, j, n;
168
169 for (i = 0; i < CFAG12864B_HEIGHT; i++)
170 for (j = 0; j < CFAG12864B_WIDTH / CFAG12864B_BPB; j++) {
171 cfag12864b_buffer[i * CFAG12864B_WIDTH / CFAG12864B_BPB +
172 j] = 0;
173 for (n = 0; n < CFAG12864B_BPB; n++)
174 if (matrix[i * CFAG12864B_WIDTH +
175 j * CFAG12864B_BPB + n])
176 cfag12864b_buffer[i * CFAG12864B_WIDTH /
177 CFAG12864B_BPB + j] |=
178 CFAG12864B_BIT(n);
179 }
180}
181
182/*
183 * blit buffer to lcd
184 */
185void cfag12864b_blit(void)
186{
187 memcpy(cfag12864b_mem, cfag12864b_buffer, CFAG12864B_SIZE);
188}
189
190/*
191 * ----------------------
192 * end of cfag12864b code
193 * ----------------------
194 */
195
196#include <stdio.h>
197#include <string.h>
198
199#define EXAMPLES 6
200
201void example(unsigned char n)
202{
203 unsigned short i, j;
204 unsigned char matrix[CFAG12864B_WIDTH * CFAG12864B_HEIGHT];
205
206 if (n > EXAMPLES)
207 return;
208
209 printf("Example %i/%i - ", n, EXAMPLES);
210
211 switch (n) {
212 case 1:
213 printf("Draw points setting bits");
214 cfag12864b_clear();
215 for (i = 0; i < CFAG12864B_WIDTH; i += 2)
216 for (j = 0; j < CFAG12864B_HEIGHT; j += 2)
217 cfag12864b_set(i, j);
218 break;
219
220 case 2:
221 printf("Clear the LCD");
222 cfag12864b_clear();
223 break;
224
225 case 3:
226 printf("Draw rows formatting a [128*64] matrix");
227 memset(matrix, 0, CFAG12864B_WIDTH * CFAG12864B_HEIGHT);
228 for (i = 0; i < CFAG12864B_WIDTH; i++)
229 for (j = 0; j < CFAG12864B_HEIGHT; j += 2)
230 matrix[j * CFAG12864B_WIDTH + i] = 1;
231 cfag12864b_format(matrix);
232 break;
233
234 case 4:
235 printf("Fill the lcd");
236 cfag12864b_fill();
237 break;
238
239 case 5:
240 printf("Draw columns unsetting bits");
241 for (i = 0; i < CFAG12864B_WIDTH; i += 2)
242 for (j = 0; j < CFAG12864B_HEIGHT; j++)
243 cfag12864b_unset(i, j);
244 break;
245
246 case 6:
247 printf("Do negative not-ing all bits");
248 for (i = 0; i < CFAG12864B_WIDTH; i++)
249 for (j = 0; j < CFAG12864B_HEIGHT; j ++)
250 cfag12864b_not(i, j);
251 break;
252 }
253
254 puts(" - [Press Enter]");
255}
256
257int main(int argc, char *argv[])
258{
259 unsigned char n;
260
261 if (argc != 2) {
262 printf(
263 "Sintax: %s fbdev\n"
264 "Usually: /dev/fb0, /dev/fb1...\n", argv[0]);
265 return -1;
266 }
267
268 if (cfag12864b_init(argv[1])) {
269 printf("Can't init %s fbdev\n", argv[1]);
270 return -2;
271 }
272
273 for (n = 1; n <= EXAMPLES; n++) {
274 example(n);
275 cfag12864b_blit();
276 while (getchar() != '\n');
277 }
278
279 cfag12864b_exit();
280
281 return 0;
282}