1 /* 2 * Filename: cfag12864b-example.c 3 * Version: 0.1.0 4 * Description: cfag12864b LCD userspace example program 5 * License: GPLv2 6 * 7 * Author: Copyright (C) Miguel Ojeda Sandonis 8 * 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 54 int cfag12864b_fd; 55 unsigned char * cfag12864b_mem; 56 unsigned 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 */ 65 static int 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 */ 84 static void cfag12864b_exit(void) 85 { 86 munmap(cfag12864b_mem, CFAG12864B_SIZE); 87 close(cfag12864b_fd); 88 } 89 90 /* 91 * set (x, y) pixel 92 */ 93 static void 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 */ 103 static void 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 */ 116 static unsigned 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 */ 129 static void 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 */ 140 static void 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 */ 151 static void 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 */ 165 static void 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 */ 185 static void 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> 197 198 #define EXAMPLES 6 199 200 static void example(unsigned char n) 201 { 202 unsigned short i, j; 203 unsigned char matrix[CFAG12864B_WIDTH * CFAG12864B_HEIGHT]; 204 205 if (n > EXAMPLES) 206 return; 207 208 printf("Example %i/%i - ", n, EXAMPLES); 209 210 switch (n) { 211 case 1: 212 printf("Draw points setting bits"); 213 cfag12864b_clear(); 214 for (i = 0; i < CFAG12864B_WIDTH; i += 2) 215 for (j = 0; j < CFAG12864B_HEIGHT; j += 2) 216 cfag12864b_set(i, j); 217 break; 218 219 case 2: 220 printf("Clear the LCD"); 221 cfag12864b_clear(); 222 break; 223 224 case 3: 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); 231 break; 232 233 case 4: 234 printf("Fill the lcd"); 235 cfag12864b_fill(); 236 break; 237 238 case 5: 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); 243 break; 244 245 case 6: 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); 250 break; 251 } 252 253 puts(" - [Press Enter]"); 254 } 255 256 int main(int argc, char *argv[]) 257 { 258 unsigned char n; 259 260 if (argc != 2) { 261 printf( 262 "Sintax: %s fbdev\n" 263 "Usually: /dev/fb0, /dev/fb1...\n", argv[0]); 264 return -1; 265 } 266 267 if (cfag12864b_init(argv[1])) { 268 printf("Can't init %s fbdev\n", argv[1]); 269 return -2; 270 } 271 272 for (n = 1; n <= EXAMPLES; n++) { 273 example(n); 274 cfag12864b_blit(); 275 while (getchar() != '\n'); 276 } 277 278 cfag12864b_exit(); 279 280 return 0; 281 } 282