1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/include/vga_display_cpu.h Fri Nov 02 02:15:09 2018 +0100
1.3 @@ -0,0 +1,95 @@
1.4 +/*
1.5 + * VGA display-related functions.
1.6 + *
1.7 + * Copyright (C) 2018 Paul Boddie <paul@boddie.org.uk>
1.8 + *
1.9 + * This program is free software: you can redistribute it and/or modify
1.10 + * it under the terms of the GNU General Public License as published by
1.11 + * the Free Software Foundation, either version 3 of the License, or
1.12 + * (at your option) any later version.
1.13 + *
1.14 + * This program is distributed in the hope that it will be useful,
1.15 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
1.16 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1.17 + * GNU General Public License for more details.
1.18 + *
1.19 + * You should have received a copy of the GNU General Public License
1.20 + * along with this program. If not, see <http://www.gnu.org/licenses/>.
1.21 + */
1.22 +
1.23 +#ifndef __VGA_DISPLAY_CPU_H__
1.24 +#define __VGA_DISPLAY_CPU_H__
1.25 +
1.26 +#include "pic32_c.h"
1.27 +#include "display.h"
1.28 +
1.29 +
1.30 +
1.31 +/* Display configuration type. */
1.32 +
1.33 +typedef struct
1.34 +{
1.35 + /* Current display state handler. */
1.36 +
1.37 + void (*state_handler)();
1.38 +
1.39 + /* Transfer properties. */
1.40 +
1.41 + int line_timer;
1.42 + uint32_t output;
1.43 +
1.44 + /* Horizontal and vertical sync peripherals. */
1.45 +
1.46 + int hsync_unit, vsync_unit;
1.47 +
1.48 + /* Current scanline. */
1.49 +
1.50 + uint32_t line;
1.51 +
1.52 + /* Pointers to pixel lines. */
1.53 +
1.54 + uint8_t *linedata;
1.55 +
1.56 + /* General display configuration. */
1.57 +
1.58 + display_config_t *display_config;
1.59 +
1.60 +} vga_display_t;
1.61 +
1.62 +
1.63 +
1.64 +/* Initialisation. */
1.65 +
1.66 +void init_vga(display_config_t *display_config, int line_timer);
1.67 +
1.68 +void init_vga_with_timer(display_config_t *display_config, int line_timer);
1.69 +
1.70 +void vga_configure_sync(int hsync_unit, int vsync_unit);
1.71 +
1.72 +void vga_configure_transfer(uint32_t output);
1.73 +
1.74 +/* Interrupt handlers. */
1.75 +
1.76 +void vga_interrupt_handler(void);
1.77 +void vga_transfer_interrupt_handler(void);
1.78 +
1.79 +/* Display state handlers. */
1.80 +
1.81 +void vbp_active(void);
1.82 +void visible_active(void);
1.83 +void vfp_active(void);
1.84 +void vsync_active(void);
1.85 +
1.86 +/* Display operations. */
1.87 +
1.88 +void start_visible(void);
1.89 +void update_visible(void);
1.90 +void stop_visible(void);
1.91 +void update_transfers(int enable);
1.92 +
1.93 +/* Vertical sync operations. */
1.94 +
1.95 +void vsync_high(void);
1.96 +void vsync_low(void);
1.97 +
1.98 +#endif /* __VGA_DISPLAY_CPU_H__ */