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121 lines
4.5 KiB
C
121 lines
4.5 KiB
C
/// @file
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/// Commodore 64 Registers and Constants
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#ifndef __C64__
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#error "Target platform must be C64"
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#endif
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#include <mos6526.h>
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#include <mos6569.h>
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#include <mos6581.h>
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/// Processor port data direction register
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char* const PROCPORT_DDR = (char*)0x00;
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/// Mask for PROCESSOR_PORT_DDR which allows only memory configuration to be written
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const char PROCPORT_DDR_MEMORY_MASK = 0b00000111;
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/// Processor Port Register controlling RAM/ROM configuration and the datasette
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char* const PROCPORT = (char*)0x01;
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/// RAM in all three areas 0xA000, 0xD000, 0xE000
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const char PROCPORT_RAM_ALL = 0b00000000;
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/// RAM in 0xA000, 0xE000 I/O in 0xD000
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const char PROCPORT_RAM_IO = 0b00000101;
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/// RAM in 0xA000, 0xE000 CHAR ROM in 0xD000
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const char PROCPORT_RAM_CHARROM = 0b00000001;
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/// RAM in 0xA000, I/O in 0xD000, KERNEL in 0xE000
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const char PROCPORT_KERNEL_IO = 0b00000110;
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/// BASIC in 0xA000, I/O in 0xD000, KERNEL in 0xE000
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const char PROCPORT_BASIC_KERNEL_IO = 0b00000111;
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/// The address of the CHARGEN character set
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char* const CHARGEN = (char*)0xd000;
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/// The SID MOS 6581/8580
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struct MOS6581_SID * const SID = (struct MOS6581_SID *)0xd400;
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/// The VIC-II MOS 6567/6569
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struct MOS6569_VICII* const VICII = (struct MOS6569_VICII*)0xd000;
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/// Color Ram
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char * const COLORRAM = (char*)0xd800;
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/// Color Ram
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char * const COLS = (char*)0xd800;
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/// Default address of screen character matrix
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char * const DEFAULT_SCREEN = (char*)0x0400;
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/// Default address of the chargen font (upper case)
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char * const DEFAULT_FONT_UPPER = (char*)0x1000;
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/// Default address of the chargen font (mixed case)
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char * const DEFAULT_FONT_MIXED = (char*)0x1800;
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/// The CIA#1: keyboard matrix, joystick #1/#2
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struct MOS6526_CIA * const CIA1 = (struct MOS6526_CIA *)0xdc00;
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/// The CIA#2: Serial bus, RS-232, VIC memory bank
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struct MOS6526_CIA * const CIA2 = (struct MOS6526_CIA *)0xdd00;
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/// CIA#1 timer A
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unsigned int* const CIA1_TIMER_A = (unsigned int*)0xdc04;
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/// CIA#1 timer B
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unsigned int* const CIA1_TIMER_B = (unsigned int*)0xdc06;
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/// CIA#1 timer A&B as one single 32-bit value
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unsigned long* const CIA1_TIMER_AB = (unsigned long*)0xdc04;
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/// CIA#1 Interrupt for reading in ASM
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char * const CIA1_INTERRUPT = (char*)0xdc0d;
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/// CIA#2 timer A
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unsigned int* const CIA2_TIMER_A = (unsigned int*)0xdd04;
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/// CIA#2 timer B
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unsigned int* const CIA2_TIMER_B = (unsigned int*)0xdd06;
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/// CIA#2 timer A&B as one single 32-bit value
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unsigned long* const CIA2_TIMER_AB = (unsigned long*)0xdd04;
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/// CIA#2 Interrupt for reading in ASM
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char * const CIA2_INTERRUPT = (char*)0xdd0d;
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/// Pointer to interrupt function
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typedef void (*IRQ_TYPE)(void);
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/// The vector used when the KERNAL serves IRQ interrupts
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IRQ_TYPE * const KERNEL_IRQ = (IRQ_TYPE*)0x0314;
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/// The vector used when the KERNAL serves NMI interrupts
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IRQ_TYPE * const KERNEL_NMI = (IRQ_TYPE*)0x0318;
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/// The vector used when the HARDWARE serves NMI interrupts
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IRQ_TYPE * const HARDWARE_NMI = (IRQ_TYPE*)0xfffa;
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/// The vector used when the HARDWARE is RESET
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IRQ_TYPE * const HARDWARE_RESET = (IRQ_TYPE*)0xfffc;
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/// The vector used when the HARDWARE serves IRQ interrupts
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IRQ_TYPE * const HARDWARE_IRQ = (IRQ_TYPE*)0xfffe;
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/// The colors of the C64
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const char BLACK = 0x0;
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const char WHITE = 0x1;
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const char RED = 0x2;
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const char CYAN = 0x3;
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const char PURPLE = 0x4;
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const char GREEN = 0x5;
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const char BLUE = 0x6;
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const char YELLOW = 0x7;
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const char ORANGE = 0x8;
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const char BROWN = 0x9;
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const char PINK = 0xa;
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const char DARK_GREY= 0xb;
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const char GREY = 0xc;
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const char LIGHT_GREEN = 0xd;
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const char LIGHT_BLUE = 0xe;
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const char LIGHT_GREY = 0xf;
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/// Get the value to store into D018 to display a specific screen and charset/bitmap
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/// Optimized for ASM from (char)((((unsigned int)screen&0x3fff)/0x40)|(((unsigned int)charset&0x3fff)/0x400));
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char toD018(char* screen, char* gfx);
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/// Get the value to store into DD00 (CIA 2 port A) to choose a specific VIC bank
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/// Optimized for ASM from %00000011 ^ (char)((unsigned int)gfx/0x4000)
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char toDd00(char* gfx);
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/// Get the sprite pointer for a sprite.
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/// The sprite pointer is the index of the sprite within the graphics bank and equal to the sprite (char)(sprite_addr/64)
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/// The sprite pointers are stored SCREEN+0x3f8+sprite_id to set the pointer of each sprite
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char toSpritePtr(char* sprite);
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/// Select a specific VIC graphics bank by setting the CIA 2 port A (0xdd00) as needed
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void vicSelectGfxBank(char* gfx);
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/// Initialize SID voice 3 for random number generation
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void sid_rnd_init();
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/// Get a random number from the SID voice 3,
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/// Must be initialized with sid_rnd_init()
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char sid_rnd();
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