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fceux
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add iowrite.readbyte() lua function, to read the last value written to write-only port. it currently supports only general sound registers ($4000-4013, $4015, $4017).

This commit is contained in:
gocha 2011-02-13 22:41:19 +00:00
parent 7ee2494ba7
commit 9cc4ee1d77
4 changed files with 21 additions and 0 deletions
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2
src/fceu.cpp
View File

@ -205,6 +205,8 @@ static readfunc *AReadG;
static writefunc *BWriteG;
static int RWWrap=0;
uint8 IOWriteLog[0x10000];
//mbg merge 7/18/06 docs
//bit0 indicates whether emulation is paused
//bit1 indicates whether emulation is in frame step mode

2
src/fceu.h
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@ -54,6 +54,8 @@ uint8 FCEU_ReadRomByte(uint32 i);
extern readfunc ARead[0x10000];
extern writefunc BWrite[0x10000];
extern uint8 IOWriteLog[0x10000];
enum GI {
GI_RESETM2 =1,
GI_POWER =2,

13
src/lua-engine.cpp
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@ -1206,6 +1206,8 @@ static int rom_gethash(lua_State *L) {
else lua_pushstring(L, "");
return 1;
}
static int iowrite_readbyte(lua_State *L) { int addr = luaL_checkinteger(L,1); lua_pushinteger(L, (addr >= 0 && addr <= 0xFFFF) ? IOWriteLog[addr] : 0); return 1; }
static int iowrite_readbytesigned(lua_State *L) { int addr = luaL_checkinteger(L,1); lua_pushinteger(L, (addr >= 0 && addr <= 0xFFFF) ? (signed char)IOWriteLog[addr] : 0); return 1; }
static int memory_readbyte(lua_State *L) { lua_pushinteger(L, FCEU_CheatGetByte(luaL_checkinteger(L,1))); return 1; }
static int memory_writebyte(lua_State *L) { FCEU_CheatSetByte(luaL_checkinteger(L,1), luaL_checkinteger(L,2)); return 0; }
static int memory_readbyterange(lua_State *L) {
@ -4699,6 +4701,16 @@ static const struct luaL_reg memorylib [] = {
{NULL,NULL}
};
static const struct luaL_reg iowritelib [] = {
{"readbyte", iowrite_readbyte},
{"readbytesigned", iowrite_readbytesigned},
// alternate naming scheme for unsigned
{"readbyteunsigned", iowrite_readbyte},
{NULL,NULL}
};
static const struct luaL_reg joypadlib[] = {
{"get", joypad_get},
{"getdown", joypad_getdown},
@ -4921,6 +4933,7 @@ int FCEU_LoadLuaCode(const char *filename, const char *arg) {
luaL_register(L, "emu", emulib); // added for better cross-emulator compatibility
luaL_register(L, "FCEU", emulib); // kept for backward compatibility
luaL_register(L, "memory", memorylib);
luaL_register(L, "iowrite", iowritelib);
luaL_register(L, "rom", romlib);
luaL_register(L, "joypad", joypadlib);
luaL_register(L, "zapper", zapperlib);

4
src/sound.cpp
View File

@ -239,6 +239,7 @@ static void SQReload(int x, uint8 V)
static DECLFW(Write_PSG)
{
IOWriteLog[A] = V;
A&=0x1F;
switch(A)
{
@ -311,6 +312,7 @@ static DECLFW(Write_PSG)
static DECLFW(Write_DMCRegs)
{
IOWriteLog[A] = V;
A&=0xF;
switch(A)
@ -342,6 +344,7 @@ static DECLFW(Write_DMCRegs)
static DECLFW(StatusWrite)
{
int x;
IOWriteLog[A] = V;
DoSQ1();
DoSQ2();
@ -1005,6 +1008,7 @@ static void RDoNoise(void)
DECLFW(Write_IRQFM)
{
IOWriteLog[A] = V;
V=(V&0xC0)>>6;
fcnt=0;
if(V&0x2)