CommonPIC32

examples/vga-dual/vga.h

154:c8a37eb47211
2021-12-14 Paul Boddie Fixed pin labels: RB10/PGEC3 should be RB10/PGED2.
     1 /*     2  * Generate a VGA signal using a PIC32 microcontroller.     3  *     4  * Copyright (C) 2017, 2018 Paul Boddie <paul@boddie.org.uk>     5  *     6  * This program is free software: you can redistribute it and/or modify     7  * it under the terms of the GNU General Public License as published by     8  * the Free Software Foundation, either version 3 of the License, or     9  * (at your option) any later version.    10  *    11  * This program is distributed in the hope that it will be useful,    12  * but WITHOUT ANY WARRANTY; without even the implied warranty of    13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the    14  * GNU General Public License for more details.    15  *    16  * You should have received a copy of the GNU General Public License    17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.    18  */    19     20 #ifndef __VGA_H__    21 #define __VGA_H__    22     23 #include "vga_common.h"    24     25 #define LINE_LENGTH             160 /* pixels */    26 #define LINE_COUNT              128 /* display lines per frame */    27 #define FRAME_COUNT             2   /* double-buffered display */    28     29 /* 24MHz cycle measurements. */    30     31 #define HFREQ_LIMIT             643    32 #define HSYNC_START             460    33 #define HSYNC_LIMIT             64    34 #define HSYNC_END               (HSYNC_START + HSYNC_LIMIT)    35     36 /* Framebuffer properties. */    37     38 #define SCREEN_SIZE             (LINE_LENGTH * LINE_COUNT)    39     40 /* A frame has an entire screen plus one line to allow horizontal scrolling,    41    since a horizontal scroll offset causes the final transfer line to exceed the    42    screen limit. */    43     44 #define FRAME_SIZE              (SCREEN_SIZE + LINE_LENGTH)    45     46 /* Transfer and pixel allocation properties. */    47     48 #define TRANSFER_CELL_SIZE      (LINE_LENGTH / 2)    49 #define CELL_SIZE               4    50     51 #endif /* __VGA_H__ */