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avoid fast-forwarding the CPU after exiting the BIOS

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This commit is contained in:
Jorj Bauer 2020-12-28 16:04:57 -05:00
parent 9f530fa2b5
commit d81cbb5607
2 changed files with 19 additions and 3 deletions
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8
sdl/aiie.cpp
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@ -36,6 +36,8 @@ volatile bool wantResume = false;
volatile bool cpuDebuggerRunning = false;
volatile bool cpuClockInitialized = false;
void doDebugging();
void readPrefs();
void writePrefs();
@ -118,14 +120,13 @@ static struct timespec runBIOS(struct timespec now)
static struct timespec runCPU(struct timespec now)
{
static bool initialized = false;
static struct timespec startTime;
static struct timespec nextInstructionTime;
if (!initialized) {
if (!cpuClockInitialized) {
do_gettime(&startTime);
do_gettime(&nextInstructionTime);
initialized = true;
cpuClockInitialized = true;
}
// Check for interrupt-like actions before running the CPU
@ -337,6 +338,7 @@ void loop()
g_display->redraw(); // Redraw the UI
((AppleDisplay*)(g_vm->vmdisplay))->modeChange(); // force a full re-draw and blit
cpuClockInitialized = false; // force it to reset so it doesn't fast-forward
wasBios = false;
}
}

14
teensy/teensy.ino
View File

@ -41,6 +41,8 @@ TeensyUSB usb;
Bounce resetButtonDebouncer = Bounce();
volatile bool cpuClockInitialized = false;
void onKeypress(int unicode)
{
/*
@ -309,6 +311,16 @@ void runCPU(uint32_t now)
static uint32_t countSinceLast = 0;
static uint32_t microsAtStart = micros();
static uint32_t microsForNext = microsAtStart + (countSinceLast * SPEEDCTL);
// Allow the BIOS to reset our timing
if (!cpuClockInitialized) {
nextResetMicros = 0;
countSinceLast = 0;
microsAtStart = micros();
microsForNext = microsAtStart + (countSinceLast * SPEEDCTL);
cpuClockInitialized = true;
}
if (now >= microsForNext) {
countSinceLast += g_cpu->Run(24); // The CPU runs in bursts of cycles. This '24' is the max burst we perform.
@ -361,6 +373,8 @@ void loop()
// Poll the keyboard before we start, so we can do selftest on startup
g_keyboard->maintainKeyboard();
// Reset the CPU clock so it doesn't fast-forward
cpuClockInitialized = false;
wasBios = false;
}
}