2 * Filename: cfag12864b-example.c
4 * Description: cfag12864b LCD userspace example program
7 * Author: Copyright (C) Miguel Ojeda Sandonis
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.
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.
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
26 * ------------------------
27 * start of cfag12864b code
28 * ------------------------
34 #include <sys/types.h>
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))
46 #undef CFAG12864B_DOCHECK
47 #ifdef CFAG12864B_DOCHECK
48 #define CFAG12864B_CHECK(x, y) ((x) < CFAG12864B_WIDTH && \
49 (y) < CFAG12864B_HEIGHT)
51 #define CFAG12864B_CHECK(x, y) (1)
55 unsigned char * cfag12864b_mem;
56 unsigned char cfag12864b_buffer[CFAG12864B_SIZE];
59 * init a cfag12864b framebuffer device
61 * No error: return = 0
62 * Unable to open: return = -1
63 * Unable to mmap: return = -2
65 int cfag12864b_init(char *path)
67 cfag12864b_fd = open(path, O_RDWR);
68 if (cfag12864b_fd == -1)
71 cfag12864b_mem = mmap(0, CFAG12864B_SIZE, PROT_READ | PROT_WRITE,
72 MAP_SHARED, cfag12864b_fd, 0);
73 if (cfag12864b_mem == MAP_FAILED) {
82 * exit a cfag12864b framebuffer device
84 void cfag12864b_exit(void)
86 munmap(cfag12864b_mem, CFAG12864B_SIZE);
93 void cfag12864b_set(unsigned char x, unsigned char y)
95 if (CFAG12864B_CHECK(x, y))
96 cfag12864b_buffer[CFAG12864B_ADDRESS(x, y)] |=
97 CFAG12864B_BIT(x % CFAG12864B_BPB);
103 void cfag12864b_unset(unsigned char x, unsigned char y)
105 if (CFAG12864B_CHECK(x, y))
106 cfag12864b_buffer[CFAG12864B_ADDRESS(x, y)] &=
107 ~CFAG12864B_BIT(x % CFAG12864B_BPB);
111 * is set (x, y) pixel?
113 * Pixel off: return = 0
114 * Pixel on: return = 1
116 unsigned char cfag12864b_isset(unsigned char x, unsigned char y)
118 if (CFAG12864B_CHECK(x, y))
119 if (cfag12864b_buffer[CFAG12864B_ADDRESS(x, y)] &
120 CFAG12864B_BIT(x % CFAG12864B_BPB))
129 void cfag12864b_not(unsigned char x, unsigned char y)
131 if (cfag12864b_isset(x, y))
132 cfag12864b_unset(x, y);
134 cfag12864b_set(x, y);
138 * fill (set all pixels)
140 void cfag12864b_fill(void)
144 for (i = 0; i < CFAG12864B_SIZE; i++)
145 cfag12864b_buffer[i] = 0xFF;
149 * clear (unset all pixels)
151 void cfag12864b_clear(void)
155 for (i = 0; i < CFAG12864B_SIZE; i++)
156 cfag12864b_buffer[i] = 0;
160 * format a [128*64] matrix
162 * Pixel off: src[i] = 0
163 * Pixel on: src[i] > 0
165 void cfag12864b_format(unsigned char * matrix)
167 unsigned char i, j, n;
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 +
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] |=
185 void cfag12864b_blit(void)
187 memcpy(cfag12864b_mem, cfag12864b_buffer, CFAG12864B_SIZE);
191 * ----------------------
192 * end of cfag12864b code
193 * ----------------------
201 void example(unsigned char n)
204 unsigned char matrix[CFAG12864B_WIDTH * CFAG12864B_HEIGHT];
209 printf("Example %i/%i - ", n, EXAMPLES);
213 printf("Draw points setting bits");
215 for (i = 0; i < CFAG12864B_WIDTH; i += 2)
216 for (j = 0; j < CFAG12864B_HEIGHT; j += 2)
217 cfag12864b_set(i, j);
221 printf("Clear the LCD");
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);
235 printf("Fill the lcd");
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);
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);
254 puts(" - [Press Enter]");
257 int main(int argc, char *argv[])
264 "Usually: /dev/fb0, /dev/fb1...\n", argv[0]);
268 if (cfag12864b_init(argv[1])) {
269 printf("Can't init %s fbdev\n", argv[1]);
273 for (n = 1; n <= EXAMPLES; n++) {
276 while (getchar() != '\n');