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 static 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 static void cfag12864b_exit(void)
86 munmap(cfag12864b_mem
, CFAG12864B_SIZE
);
93 static 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 static 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 static 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 static 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 static void cfag12864b_fill(void)
144 for (i
= 0; i
< CFAG12864B_SIZE
; i
++)
145 cfag12864b_buffer
[i
] = 0xFF;
149 * clear (unset all pixels)
151 static 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 static 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 static void cfag12864b_blit(void)
187 memcpy(cfag12864b_mem
, cfag12864b_buffer
, CFAG12864B_SIZE
);
191 * ----------------------
192 * end of cfag12864b code
193 * ----------------------
200 static void example(unsigned char n
)
203 unsigned char matrix
[CFAG12864B_WIDTH
* CFAG12864B_HEIGHT
];
208 printf("Example %i/%i - ", n
, EXAMPLES
);
212 printf("Draw points setting bits");
214 for (i
= 0; i
< CFAG12864B_WIDTH
; i
+= 2)
215 for (j
= 0; j
< CFAG12864B_HEIGHT
; j
+= 2)
216 cfag12864b_set(i
, j
);
220 printf("Clear the LCD");
225 printf("Draw rows formatting a [128*64] matrix");
226 memset(matrix
, 0, CFAG12864B_WIDTH
* CFAG12864B_HEIGHT
);
227 for (i
= 0; i
< CFAG12864B_WIDTH
; i
++)
228 for (j
= 0; j
< CFAG12864B_HEIGHT
; j
+= 2)
229 matrix
[j
* CFAG12864B_WIDTH
+ i
] = 1;
230 cfag12864b_format(matrix
);
234 printf("Fill the lcd");
239 printf("Draw columns unsetting bits");
240 for (i
= 0; i
< CFAG12864B_WIDTH
; i
+= 2)
241 for (j
= 0; j
< CFAG12864B_HEIGHT
; j
++)
242 cfag12864b_unset(i
, j
);
246 printf("Do negative not-ing all bits");
247 for (i
= 0; i
< CFAG12864B_WIDTH
; i
++)
248 for (j
= 0; j
< CFAG12864B_HEIGHT
; j
++)
249 cfag12864b_not(i
, j
);
253 puts(" - [Press Enter]");
256 int main(int argc
, char *argv
[])
263 "Usually: /dev/fb0, /dev/fb1...\n", argv
[0]);
267 if (cfag12864b_init(argv
[1])) {
268 printf("Can't init %s fbdev\n", argv
[1]);
272 for (n
= 1; n
<= EXAMPLES
; n
++) {
275 while (getchar() != '\n');
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