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Because of its boot room, the LR35902 needs a custom clear mechanism.

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Signed-off-by: Adrian.Conlon <adrian.conlon@gmail.com>
This commit is contained in:
Adrian.Conlon 2017-08-10 20:30:37 +01:00
parent 787d9dd799
commit 7948962d70
3 changed files with 15 additions and 3 deletions
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8
LR35902/inc/Bus.h
View File

@ -79,6 +79,8 @@ namespace EightBit {
void reset();
virtual void clear() override;
void writeRegister(int offset, uint8_t content) {
return Memory::write(BASE + offset, content);
}
@ -95,10 +97,13 @@ namespace EightBit {
writeRegister(LY, 0);
}
void disableBootRom() { m_disableBootRom = true; }
void enableBootRom() { m_disableBootRom = false; }
void loadBootRom(const std::string& path);
bool isBootRom(uint16_t address) const {
return (address < m_boot.size()) && !peek(BASE + BOOT_DISABLE);
return !m_disableBootRom && (address < m_boot.size()) && !peek(BASE + BOOT_DISABLE);
}
virtual uint8_t peek(uint16_t address) const;
@ -107,5 +112,6 @@ namespace EightBit {
private:
std::array<uint8_t, 0x100> m_boot;
bool m_disableBootRom;
};
}

8
LR35902/src/Bus.cpp
View File

@ -2,7 +2,8 @@
#include "Bus.h"
EightBit::Bus::Bus()
: Memory(0xffff) {
: Memory(0xffff),
m_disableBootRom(false) {
}
void EightBit::Bus::reset() {
@ -10,6 +11,11 @@ void EightBit::Bus::reset() {
writeRegister(LCDC, 0x91);
}
void EightBit::Bus::clear() {
Memory::clear();
m_boot.fill(0);
}
void EightBit::Bus::loadBootRom(const std::string& path) {
auto size = loadMemory(path, 0);
if (size != 0x100)

2
inc/Memory.h
View File

@ -91,7 +91,7 @@ namespace EightBit {
write(value);
}
void clear();
virtual void clear();
void loadRom(const std::string& path, uint16_t offset);
void loadRam(const std::string& path, uint16_t offset);