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feat: Enhance APU and SPC700 Logging and Instruction Handling

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- Updated APU boot ROM comments for clarity and completeness, including details on multi-byte transfer acknowledgments.
- Improved logging in APU and SPC700 classes to provide comprehensive tracing during execution, particularly for transfer protocols and MOVS instructions.
- Refactored MOVS, MOVSX, and MOVSY methods to use consistent address handling, enhancing readability and maintainability.
- Added conditional logging for specific addresses to aid in debugging and tracking state changes during instruction execution.
This commit is contained in:
scawful
2025-10-06 12:57:42 -04:00
parent a881c0f8e1
commit ba40ddab2a
3 changed files with 55 additions and 34 deletions
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31
src/app/emu/audio/spc700.cc
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@@ -54,10 +54,20 @@ void Spc700::RunOpcode() {
return;
}
if (step == 0) {
// Debug: Log SPC execution in IPL ROM range and multi-step state
// Debug: Comprehensive IPL ROM tracing for transfer protocol debugging
static int spc_exec_count = 0;
if ((PC >= 0xFFCF && PC <= 0xFFFF) && spc_exec_count++ < 50) {
LOG_INFO("SPC", "Execute: PC=$%04X step=0 bstep=%d", PC, bstep);
bool in_critical_range = (PC >= 0xFFCF && PC <= 0xFFFF);
bool is_transfer_loop = (PC >= 0xFFDB && PC <= 0xFFEB);
if (in_critical_range && spc_exec_count++ < 200) {
LOG_INFO("SPC", "Execute: PC=$%04X step=0 bstep=%d Y=%02X A=%02X", PC, bstep, Y, A);
}
if (is_transfer_loop && spc_exec_count < 500) {
// Read ports to log transfer state
uint8_t f4_val = callbacks_.read(0xF4);
uint8_t f5_val = callbacks_.read(0xF5);
LOG_INFO("SPC", "TRANSFER LOOP: PC=$%04X Y=%02X F4=%02X F5=%02X",
PC, Y, f4_val, f5_val);
}
// Only read new opcode if previous instruction is complete
@@ -1061,7 +1071,10 @@ void Spc700::ExecuteInstructions(uint8_t opcode) {
}
case 0xc4: { // movs dp
LOG_INFO("SPC", "Case 0xC4 reached: bstep=%d PC=$%04X", bstep, PC);
MOVS(dp());
uint16_t adr = dp();
LOG_INFO("SPC", "About to call MOVS: bstep=%d adr=$%04X", bstep, adr);
MOVS(adr);
LOG_INFO("SPC", "After MOVS: bstep=%d", bstep);
break;
}
case 0xc5: { // movs abs
@@ -1093,7 +1106,11 @@ void Spc700::ExecuteInstructions(uint8_t opcode) {
break;
}
case 0xcb: { // movsy dp
MOVSY(dp());
uint16_t addr = dp();
if (addr == 0x00F4) {
LOG_INFO("SPC", "MOVSY writing Y=$%02X to F4 at PC=$%04X", Y, PC);
}
MOVSY(addr);
break;
}
case 0xcc: { // movsy abs
@@ -1269,6 +1286,10 @@ void Spc700::ExecuteInstructions(uint8_t opcode) {
case 0xef: { // sleep imp
// Emulate low-power idle without halting the core permanently.
// Advance timers/DSP via idle callbacks, but do not set stopped_.
static int sleep_log = 0;
if (sleep_log++ < 5) {
LOG_WARN("SPC", "SLEEP executed at PC=$%04X - entering low power mode", PC - 1);
}
read(PC);
for (int i = 0; i < 4; ++i) callbacks_.idle(true);
break;