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add experimental single-cycle step control to spc700

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scawful
2024-05-11 13:56:19 -04:00
parent d42421a5a6
commit a6907044bd
3 changed files with 57 additions and 25 deletions
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31
src/app/emu/audio/spc700.cc
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@@ -22,6 +22,7 @@ void Spc700::Reset(bool hard) {
SP = 0x00;
PSW = ByteToFlags(0x00);
}
step = 0;
stopped_ = false;
reset_wanted_ = true;
}
@@ -44,7 +45,14 @@ void Spc700::RunOpcode() {
callbacks_.idle(true);
return;
}
ExecuteInstructions(ReadOpcode());
if (step == 0) {
bstep = 0;
opcode = ReadOpcode();
step = 1;
return;
}
ExecuteInstructions(opcode);
if (step == 1) step = 0; // reset step for non cycle-stepped opcodes.
}
void Spc700::ExecuteInstructions(uint8_t opcode) {
@@ -814,7 +822,6 @@ void Spc700::ExecuteInstructions(uint8_t opcode) {
A--;
PSW.Z = (A == 0);
PSW.N = (A & 0x80);
;
break;
}
case 0x9d: { // movxp imp
@@ -843,7 +850,6 @@ void Spc700::ExecuteInstructions(uint8_t opcode) {
A = yva & 0xff;
PSW.Z = (A == 0);
PSW.N = (A & 0x80);
;
break;
}
case 0x9f: { // xcn imp
@@ -991,7 +997,6 @@ void Spc700::ExecuteInstructions(uint8_t opcode) {
}
PSW.Z = (A == 0);
PSW.N = (A & 0x80);
;
break;
}
case 0xbf: { // mov ind+
@@ -1069,7 +1074,21 @@ void Spc700::ExecuteInstructions(uint8_t opcode) {
break;
}
case 0xd0: { // bne rel
DoBranch(ReadOpcode(), !PSW.Z);
switch (step++) {
case 1:
dat = ReadOpcode();
if (PSW.Z) step = 0;
break;
case 2:
callbacks_.idle(false);
break;
case 3:
callbacks_.idle(false);
PC += (int8_t)dat;
step = 0;
break;
}
// DoBranch(ReadOpcode(), !PSW.Z);
break;
}
case 0xd4: { // movs dpx
@@ -1276,8 +1295,6 @@ void Spc700::ExecuteInstructions(uint8_t opcode) {
throw std::runtime_error("Unknown SPC opcode: " + std::to_string(opcode));
break;
}
//LogInstruction(initialPC, opcode);
}
void Spc700::LogInstruction(uint16_t initial_pc, uint8_t opcode) {