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cvideo.h
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cvideo.h
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//
// Title: Pico-mposite Video Output
// Author: Dean Belfield
// Created: 26/01/2021
// Last Updated: 01/03/2022
//
// Modinfo:
// 31/01/2022: Tweaks to reflect code changes
// 02/02/2022: Added initialise_cvideo
// 04/02/2022: Added set_border
// 05/02/2022: Added support for colour composite board
// 20/02/2022: Bitmap is now dynamically allocated
// 01/03/2022: Tweaked sync parameters for colour version
#pragma once
#include "config.h"
#define piofreq_0 5.2083f // Clock frequency of state machine for PIO handling sync
// Clock frequency of state machine for PIO handling pixel data at various resolutions
// NB - In this application only the 320px version is used/tested
// Value needs to have a simple relationship to piofreq_0 to avoid jitter between HSYNC and horizontal
// image position - see https://github.com/breakintoprogram/pico-mposite/issues/6
#define piofreq_1_192 9.34f
#define piofreq_1_256 7.00f
#define piofreq_1_320 5.2083f
#define piofreq_1_342 5.2083f
#define piofreq_1_640 2.80f
#define sm_sync 0 // State machine number in the PIO for the sync data
#define sm_data 1 // State machine number in the PIO for the pixel data
#if opt_colour == 0
#define colour_base 0x10 // Start colour; for monochrome version this relates to black level voltage
#define colour_max 0x0f // Last available colour
#define HSLO 0x0001
#define HSHI 0x000d
#define VSLO HSLO
#define VSHI HSHI
#define BORD 0x8000
#define gpio_base 0
#define gpio_count 5
#define gpio_data_count gpio_count
// For debugging you may use these values to output hsync and vsync on the same pins as the colour mode
// as well as the normal monochrome composite sync/video
// #define HSLO 0x4201
// #define HSHI 0x400d
// #define VSLO 0x4101
// #define VSHI 0x400d
// #define BORD 0x8000
// #define gpio_count 10
#elif opt_colour == 1
#define colour_base 0x00
#define colour_max 0xFF
#define HSLO 0x4200
#define HSHI 0x4000
#define VSLO 0x4100
#define VSHI 0x4000
#define BORD 0x8000
#define gpio_base 0
#define gpio_count 10
#define gpio_data_count gpio_count
#else
#define colour_base 0x00
#define colour_max 0x7
#define HSLO 0x4000
#define HSHI 0x4008
#define VSLO HSLO
#define VSHI HSHI
// BORD must contain the sync level information as it is written by the sync PIO and not the data PIO
#define BORD 0x8008
#define gpio_base 3
#define gpio_count 4
// Setting gpio_data_count to less than gpio_count stops the data PIO writing to the bits only
// used for sync. Therefore the sync doesn't need to be included in the data bitmap
#define gpio_data_count 3
#endif
extern unsigned char * bitmap;
extern int width;
extern int height;
int initialise_cvideo(void);
int set_mode(int mode);
void cvideo_configure_pio_dma(PIO pio, uint sm, uint dma_channel, uint transfer_size, size_t buffer_size, irq_handler_t handler);
void cvideo_pio_handler(void);
void cvideo_dma_handler(void);
void wait_vblank(void);
void set_border(unsigned char colour);