mirror of
https://github.com/MoleskiCoder/EightBit.git
synced 2024-07-10 19:29:00 +00:00
119 lines
1.8 KiB
C++
119 lines
1.8 KiB
C++
#pragma once
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#include "Memory.h"
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namespace EightBit {
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class Bus : public Memory {
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public:
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enum {
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TotalLineCount = 154
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};
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enum {
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VideoRam = 0x8000
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};
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enum {
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BASE = 0xFF00,
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// Port/Mode Registers
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P1 = 0x0,
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SB = 0x1,
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SC = 0x2,
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DIV = 0x4,
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TIMA = 0x5,
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TMA = 0x6,
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TAC = 0x7,
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// Interrupt Flags
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IF = 0xF,
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IE = 0xFF,
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// LCD Display Registers
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LCDC = 0x40,
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STAT = 0x41,
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SCY = 0x42,
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SCX = 0x43,
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LY = 0x44,
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LYC = 0x45,
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DMA = 0x46,
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BGP = 0x47,
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OBP0 = 0x48,
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OBP1 = 0x49,
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WY = 0x4A,
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WX = 0x4B,
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// Sound Registers
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NR10 = 0x10,
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NR11 = 0x11,
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NR12 = 0x12,
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NR13 = 0x13,
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NR14 = 0x14,
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NR21 = 0x16,
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NR22 = 0x17,
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NR23 = 0x18,
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NR24 = 0x19,
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NR30 = 0x1A,
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NR31 = 0x1B,
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NR32 = 0x1C,
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NR33 = 0x1D,
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NR34 = 0x1E,
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NR41 = 0x20,
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NR42 = 0x21,
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NR43 = 0x22,
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NR44 = 0x23,
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NR50 = 0x24,
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NR51 = 0x25,
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NR52 = 0x26,
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WPRAM_START = 0x30,
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WPRAM_END = 0x3F,
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// Boot rom control
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BOOT_DISABLE = 0x50,
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};
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Bus();
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void reset();
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void writeRegister(int offset, uint8_t content) {
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REG(offset) = content;
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fireWriteBusEvent();
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}
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uint8_t readRegister(int offset) {
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auto returned = REG(offset);
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fireReadBusEvent();
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return returned;
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}
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void incrementLY() {
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REG(LY) = (REG(LY) + 1) % TotalLineCount;
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}
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void resetLY() {
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REG(LY) = 0;
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}
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void loadBootRom(const std::string& path);
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bool isBootRom(uint16_t address) const {
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return (address < m_boot.size()) && !peek(BASE + BOOT_DISABLE);
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}
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virtual uint8_t peek(uint16_t address) const;
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virtual uint8_t& reference();
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private:
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std::array<uint8_t, 0x100> m_boot;
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uint8_t& REG(int offset) {
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ADDRESS().word = BASE + offset;
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return Memory::reference();
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}
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};
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} |