llvm-mos-sdk/atari2600__constants_8h_source.html

// Copyright 2023 LLVM-MOS Project

// Licensed under the Apache License, Version 2.0 with LLVM Exceptions.

// See https://github.com/llvm-mos/llvm-mos-sdk/blob/main/LICENSE for license

// information.


// Originally from cc65.


#ifndef _ATARI2600_CONSTANTS_H

#define _ATARI2600_CONSTANTS_H


// TIA - CONSTANTS


#define HMOVE_L7          (0x70)

#define HMOVE_L6          (0x60)

#define HMOVE_L5          (0x50)

#define HMOVE_L4          (0x40)

#define HMOVE_L3          (0x30)

#define HMOVE_L2          (0x20)

#define HMOVE_L1          (0x10)

#define HMOVE_0           (0x00)

#define HMOVE_R1          (0xF0)

#define HMOVE_R2          (0xE0)

#define HMOVE_R3          (0xD0)

#define HMOVE_R4          (0xC0)

#define HMOVE_R5          (0xB0)

#define HMOVE_R6          (0xA0)

#define HMOVE_R7          (0x90)

#define HMOVE_R8          (0x80)


// Values for ENAMx and ENABL

#define DISABLE_BM        (0b00)

#define ENABLE_BM         (0b10)


// Values for RESMPx

#define LOCK_MISSILE      (0b10)

#define UNLOCK_MISSILE    (0b00)


// Values for REFPx

#define NO_REFLECT        (0b0000)

#define REFLECT           (0b1000)


// Values for NUSIZx

#define ONE_COPY          (0b000)

#define TWO_COPIES        (0b001)

#define TWO_MED_COPIES    (0b010)

#define THREE_COPIES      (0b011)

#define TWO_WIDE_COPIES   (0b100)

#define DOUBLE_SIZE       (0b101)

#define THREE_MED_COPIES  (0b110)

#define QUAD_SIZE         (0b111)

#define MSBL_SIZE1        (0b000000)

#define MSBL_SIZE2        (0b010000)

#define MSBL_SIZE4        (0b100000)

#define MSBL_SIZE8        (0b110000)


// Values for CTRLPF

#define PF_PRIORITY       (0b100)

#define PF_SCORE          (0b10)

#define PF_REFLECT        (0b01)

#define PF_NO_REFLECT     (0b00)


// Values for SWCHB

#define P1_DIFF_MASK      (0b10000000)

#define P0_DIFF_MASK      (0b01000000)

#define BW_MASK           (0b00001000)

#define SELECT_MASK       (0b00000010)

#define RESET_MASK        (0b00000001)


#define VERTICAL_DELAY    (1)


// SWCHA joystick bits

#define MOVE_RIGHT        (0b01111111)

#define MOVE_LEFT         (0b10111111)

#define MOVE_DOWN         (0b11011111)

#define MOVE_UP           (0b11101111)

#define P0_JOYSTICK_MASK  (0b11110000)

#define P1_JOYSTICK_MASK  (0b00001111)


// SWCHA paddle bits

#define P0_TRIGGER_PRESSED (0b01111111)

#define P1_TRIGGER_PRESSED (0b10111111)

#define P2_TRIGGER_PRESSED (0b11110111)

#define P3_TRIGGER_PRESSED (0b11111011)


// Values for VBLANK

#define DUMP_PORTS        (0b10000000)

#define ENABLE_LATCHES    (0b01000000)

#define DISABLE_TIA       (0b00000010)

#define ENABLE_TIA        (0b00000000)


// Values for VSYNC

#define START_VERT_SYNC   (0b10)

#define STOP_VERT_SYNC    (0b00)


#endif