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 <maxextreme@gmail.com> 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 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} 283