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-rw-r--r--Documentation/auxdisplay/cfag12864b-example.c281
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diff --git a/Documentation/auxdisplay/cfag12864b-example.c b/Documentation/auxdisplay/cfag12864b-example.c
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-/*
- * Filename: cfag12864b-example.c
- * Version: 0.1.0
- * Description: cfag12864b LCD userspace example program
- * License: GPLv2
- *
- * Author: Copyright (C) Miguel Ojeda Sandonis
- * Date: 2006-10-31
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- */
-
-/*
- * ------------------------
- * start of cfag12864b code
- * ------------------------
- */
-
-#include <string.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/mman.h>
-
-#define CFAG12864B_WIDTH (128)
-#define CFAG12864B_HEIGHT (64)
-#define CFAG12864B_SIZE (128 * 64 / 8)
-#define CFAG12864B_BPB (8)
-#define CFAG12864B_ADDRESS(x, y) ((y) * CFAG12864B_WIDTH / \
- CFAG12864B_BPB + (x) / CFAG12864B_BPB)
-#define CFAG12864B_BIT(n) (((unsigned char) 1) << (n))
-
-#undef CFAG12864B_DOCHECK
-#ifdef CFAG12864B_DOCHECK
- #define CFAG12864B_CHECK(x, y) ((x) < CFAG12864B_WIDTH && \
- (y) < CFAG12864B_HEIGHT)
-#else
- #define CFAG12864B_CHECK(x, y) (1)
-#endif
-
-int cfag12864b_fd;
-unsigned char * cfag12864b_mem;
-unsigned char cfag12864b_buffer[CFAG12864B_SIZE];
-
-/*
- * init a cfag12864b framebuffer device
- *
- * No error: return = 0
- * Unable to open: return = -1
- * Unable to mmap: return = -2
- */
-static int cfag12864b_init(char *path)
-{
- cfag12864b_fd = open(path, O_RDWR);
- if (cfag12864b_fd == -1)
- return -1;
-
- cfag12864b_mem = mmap(0, CFAG12864B_SIZE, PROT_READ | PROT_WRITE,
- MAP_SHARED, cfag12864b_fd, 0);
- if (cfag12864b_mem == MAP_FAILED) {
- close(cfag12864b_fd);
- return -2;
- }
-
- return 0;
-}
-
-/*
- * exit a cfag12864b framebuffer device
- */
-static void cfag12864b_exit(void)
-{
- munmap(cfag12864b_mem, CFAG12864B_SIZE);
- close(cfag12864b_fd);
-}
-
-/*
- * set (x, y) pixel
- */
-static void cfag12864b_set(unsigned char x, unsigned char y)
-{
- if (CFAG12864B_CHECK(x, y))
- cfag12864b_buffer[CFAG12864B_ADDRESS(x, y)] |=
- CFAG12864B_BIT(x % CFAG12864B_BPB);
-}
-
-/*
- * unset (x, y) pixel
- */
-static void cfag12864b_unset(unsigned char x, unsigned char y)
-{
- if (CFAG12864B_CHECK(x, y))
- cfag12864b_buffer[CFAG12864B_ADDRESS(x, y)] &=
- ~CFAG12864B_BIT(x % CFAG12864B_BPB);
-}
-
-/*
- * is set (x, y) pixel?
- *
- * Pixel off: return = 0
- * Pixel on: return = 1
- */
-static unsigned char cfag12864b_isset(unsigned char x, unsigned char y)
-{
- if (CFAG12864B_CHECK(x, y))
- if (cfag12864b_buffer[CFAG12864B_ADDRESS(x, y)] &
- CFAG12864B_BIT(x % CFAG12864B_BPB))
- return 1;
-
- return 0;
-}
-
-/*
- * not (x, y) pixel
- */
-static void cfag12864b_not(unsigned char x, unsigned char y)
-{
- if (cfag12864b_isset(x, y))
- cfag12864b_unset(x, y);
- else
- cfag12864b_set(x, y);
-}
-
-/*
- * fill (set all pixels)
- */
-static void cfag12864b_fill(void)
-{
- unsigned short i;
-
- for (i = 0; i < CFAG12864B_SIZE; i++)
- cfag12864b_buffer[i] = 0xFF;
-}
-
-/*
- * clear (unset all pixels)
- */
-static void cfag12864b_clear(void)
-{
- unsigned short i;
-
- for (i = 0; i < CFAG12864B_SIZE; i++)
- cfag12864b_buffer[i] = 0;
-}
-
-/*
- * format a [128*64] matrix
- *
- * Pixel off: src[i] = 0
- * Pixel on: src[i] > 0
- */
-static void cfag12864b_format(unsigned char * matrix)
-{
- unsigned char i, j, n;
-
- for (i = 0; i < CFAG12864B_HEIGHT; i++)
- for (j = 0; j < CFAG12864B_WIDTH / CFAG12864B_BPB; j++) {
- cfag12864b_buffer[i * CFAG12864B_WIDTH / CFAG12864B_BPB +
- j] = 0;
- for (n = 0; n < CFAG12864B_BPB; n++)
- if (matrix[i * CFAG12864B_WIDTH +
- j * CFAG12864B_BPB + n])
- cfag12864b_buffer[i * CFAG12864B_WIDTH /
- CFAG12864B_BPB + j] |=
- CFAG12864B_BIT(n);
- }
-}
-
-/*
- * blit buffer to lcd
- */
-static void cfag12864b_blit(void)
-{
- memcpy(cfag12864b_mem, cfag12864b_buffer, CFAG12864B_SIZE);
-}
-
-/*
- * ----------------------
- * end of cfag12864b code
- * ----------------------
- */
-
-#include <stdio.h>
-
-#define EXAMPLES 6
-
-static void example(unsigned char n)
-{
- unsigned short i, j;
- unsigned char matrix[CFAG12864B_WIDTH * CFAG12864B_HEIGHT];
-
- if (n > EXAMPLES)
- return;
-
- printf("Example %i/%i - ", n, EXAMPLES);
-
- switch (n) {
- case 1:
- printf("Draw points setting bits");
- cfag12864b_clear();
- for (i = 0; i < CFAG12864B_WIDTH; i += 2)
- for (j = 0; j < CFAG12864B_HEIGHT; j += 2)
- cfag12864b_set(i, j);
- break;
-
- case 2:
- printf("Clear the LCD");
- cfag12864b_clear();
- break;
-
- case 3:
- printf("Draw rows formatting a [128*64] matrix");
- memset(matrix, 0, CFAG12864B_WIDTH * CFAG12864B_HEIGHT);
- for (i = 0; i < CFAG12864B_WIDTH; i++)
- for (j = 0; j < CFAG12864B_HEIGHT; j += 2)
- matrix[j * CFAG12864B_WIDTH + i] = 1;
- cfag12864b_format(matrix);
- break;
-
- case 4:
- printf("Fill the lcd");
- cfag12864b_fill();
- break;
-
- case 5:
- printf("Draw columns unsetting bits");
- for (i = 0; i < CFAG12864B_WIDTH; i += 2)
- for (j = 0; j < CFAG12864B_HEIGHT; j++)
- cfag12864b_unset(i, j);
- break;
-
- case 6:
- printf("Do negative not-ing all bits");
- for (i = 0; i < CFAG12864B_WIDTH; i++)
- for (j = 0; j < CFAG12864B_HEIGHT; j ++)
- cfag12864b_not(i, j);
- break;
- }
-
- puts(" - [Press Enter]");
-}
-
-int main(int argc, char *argv[])
-{
- unsigned char n;
-
- if (argc != 2) {
- printf(
- "Sintax: %s fbdev\n"
- "Usually: /dev/fb0, /dev/fb1...\n", argv[0]);
- return -1;
- }
-
- if (cfag12864b_init(argv[1])) {
- printf("Can't init %s fbdev\n", argv[1]);
- return -2;
- }
-
- for (n = 1; n <= EXAMPLES; n++) {
- example(n);
- cfag12864b_blit();
- while (getchar() != '\n');
- }
-
- cfag12864b_exit();
-
- return 0;
-}