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threads conversion

This commit is contained in:
Jorj Bauer 2020-07-08 16:37:26 -04:00
parent a78b4ff203
commit e1288db403
4 changed files with 213 additions and 133 deletions
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12
bios.cpp
View File

@ -7,6 +7,7 @@
#include "cpu.h"
#ifdef TEENSYDUINO
#include <TeensyThreads.h>
#include "teensy-paddles.h"
#endif
@ -147,14 +148,7 @@ bool BIOS::runUntilDone()
break;
case ACT_SPEED:
currentCPUSpeedIndex++;
#ifdef TEENSYDUINO
// The Teensy doesn't have any overhead to spare. Allow slowing
// down the virtual CPU, but not speeding it up...
currentCPUSpeedIndex %= 2;
#else
// Other variants can support double and quad speeds.
currentCPUSpeedIndex %= 4;
#endif
switch (currentCPUSpeedIndex) {
case CPUSPEED_HALF:
g_speed = 1023000/2;
@ -296,16 +290,18 @@ uint8_t BIOS::GetAction(int8_t selection)
#ifndef TEENSYDUINO
usleep(100)
#endif
threads.delay(1);
;
// Wait for either a keypress or the reset button to be pressed
}
#ifdef TEENSYDUINO
// FIXME: debounce!
if (digitalRead(RESETPIN) == LOW) {
// wait until it's no longer pressed
while (digitalRead(RESETPIN) == HIGH)
;
delay(100); // wait long enough for it to debounce
threads.delay(100); // wait long enough for it to debounce
// then return an exit code
return ACT_EXIT;
}

1
globals.cpp
View File

@ -12,7 +12,6 @@ VMui *g_ui;
int8_t g_volume = 15;
uint8_t g_displayType = 3; // FIXME m_perfectcolor
VMRam g_ram;
volatile bool g_inInterrupt = false;
volatile uint8_t g_debugMode = D_NONE;
bool g_prioritizeDisplay = false;
volatile bool g_biosInterrupt = false;

5
globals.h
View File

@ -47,11 +47,14 @@ extern VMui *g_ui;
extern int8_t g_volume;
extern uint8_t g_displayType;
extern VMRam g_ram;
extern volatile bool g_inInterrupt;
extern volatile uint8_t g_debugMode;
extern bool g_prioritizeDisplay;
extern volatile bool g_biosInterrupt;
extern uint32_t g_speed;
extern bool g_invertPaddleX;
extern bool g_invertPaddleY;
#include <TeensyThreads.h>
extern Threads::Mutex spi_lock;
#endif

328
teensy/teensy.ino
View File

@ -1,7 +1,8 @@
#include <Arduino.h>
#include <SPI.h>
#include <TimeLib.h>
#include <TimerOne.h>
#include <TeensyThreads.h>
#include <Bounce2.h>
#include "bios.h"
#include "cpu.h"
#include "applevm.h"
@ -26,9 +27,6 @@
#include "globals.h"
#include "teensy-crash.h"
uint32_t nextInstructionMicros;
uint32_t startMicros;
BIOS bios;
// How many microseconds per cycle
@ -38,6 +36,17 @@ static time_t getTeensy3Time() { return Teensy3Clock.get(); }
TeensyUSB usb;
int cpuThreadId;
int displayThreadId;
int maintenanceThreadId;
int biosThreadId = -1;
Bounce resetButtonDebouncer = Bounce();
Threads::Mutex cpulock; // For the BIOS to suspend CPU cleanly
Threads::Mutex displaylock; // For the BIOS to shut down the display cleanly
volatile bool g_writePrefsFromMainLoop = false;
void onKeypress(int unicode)
{
Serial.print("onKeypress:");
@ -186,24 +195,29 @@ void setup()
println("Reading prefs");
readPrefs(); // read from eeprom and set anything we need setting
startMicros = nextInstructionMicros = micros();
// Debugging: insert a disk on startup...
//((AppleVM *)g_vm)->insertDisk(0, "/A2DISKS/UTIL/mock2dem.dsk", false);
//((AppleVM *)g_vm)->insertDisk(0, "/A2DISKS/JORJ/disk_s6d1.dsk", false);
// ((AppleVM *)g_vm)->insertDisk(0, "/A2DISKS/GAMES/ALIBABA.DSK", false);
// pinMode(56, OUTPUT);
// pinMode(57, OUTPUT);
Serial.print("Free RAM: ");
println(FreeRamEstimate());
resetButtonDebouncer.attach(RESETPIN);
resetButtonDebouncer.interval(5); // ms
println("free-running");
Timer1.initialize(3);
Timer1.attachInterrupt(runCPU);
Timer1.start();
threads.setMicroTimer(); // use a 100uS timer instead of a 1mS timer
cpuThreadId = threads.addThread(runCPU);
displayThreadId = threads.addThread(runDisplay);
maintenanceThreadId = threads.addThread(runMaintenance);
// Set the relative priorities of the threads by defining how long a "slice"
// is for each (in 100uS "ticks")
// At a ratio of 50:10:1, we get about 30FPS and 100% CPU speed.
threads.setTimeSlice(displayThreadId, 100);
threads.setTimeSlice(cpuThreadId, 20);
threads.setTimeSlice(maintenanceThreadId, 1);
}
// FIXME: move these memory-related functions elsewhere...
@ -234,156 +248,229 @@ int heapSize(){
void biosInterrupt()
{
Timer1.stop();
// Make sure the CPU and display don't run while we're in interrupt.
Threads::Scope lock1(cpulock);
Threads::Scope lock2(displaylock);
Serial.println("Waiting for button to be released");
// wait for the interrupt button to be released
while (digitalRead(RESETPIN) == LOW)
while (!resetButtonDebouncer.read())
;
Serial.println("Invoking BIOS");
// invoke the BIOS
if (bios.runUntilDone()) {
// if it returned true, we have something to store persistently in EEPROM.
writePrefs();
// The EEPROM doesn't like to be written to from a thread?
Serial.println("Writing prefs");
g_writePrefsFromMainLoop = true;
while (g_writePrefsFromMainLoop) {
Serial.println("Waiting for prefs to be written");
delay(100);
// wait for write to complete
}
// Also might have changed the paddles state
Serial.println("Updating paddle state");
TeensyPaddles *tmp = (TeensyPaddles *)g_paddles;
tmp->setRev(g_invertPaddleX, g_invertPaddleY);
}
Serial.println("Cleaning up");
// if we turned off debugMode, make sure to clear the debugMsg
if (g_debugMode == D_NONE) {
g_display->debugMsg("");
}
// clear the CPU next-step counters
#if 0
// FIXME: this is to prevent the CPU from racing to catch up, and we need sth in the threads world
g_cpu->cycles = 0;
nextInstructionMicros = micros();
startMicros = micros();
#endif
// Drain the speaker queue (FIXME: a little hacky)
g_speaker->maintainSpeaker(-1, -1);
Serial.println("Forcing display redraw");
// Force the display to redraw
g_display->redraw(); // Redraw the UI
((AppleDisplay*)(g_vm->vmdisplay))->modeChange(); // force a full re-draw and blit
Serial.println("re-priming keyboard");
// Poll the keyboard before we start, so we can do selftest on startup
g_keyboard->maintainKeyboard();
Timer1.start();
}
//bool debugState = false;
//bool debugLCDState = false;
// FIXME: how often does this really need to run? We can threads.yield() when we're running too quickly
void runMaintenance()
{
uint32_t nextRuntime = 0;
while (1) {
if (millis() > nextRuntime) {
nextRuntime = millis() + 100; // FIXME: what's a good time here
if (biosThreadId == -1) {
// bios is not running; see if it should be
if (!resetButtonDebouncer.read()) {
// This is the BIOS interrupt. We immediately act on it.
biosThreadId = threads.addThread(biosInterrupt);
}
} else if (threads.getState(biosThreadId) != Threads::RUNNING) {
// When the BIOS thread exits, we clean up
Serial.println("Cleaing up bios thread");
threads.wait(biosThreadId);
Serial.println("BIOS thread is cleaned");
biosThreadId = -1;
}
g_keyboard->maintainKeyboard();
usb.maintain();
static unsigned long nextBattCheck = millis() + 30;// debugging
static int batteryLevel = 0; // static for debugging code! When done
// debugging, this can become a local
// in the appropriate block below
if (millis() >= nextBattCheck) {
// FIXME: what about rollover?
nextBattCheck = millis() + 3 * 1000; // check every 3 seconds
// This is a bit disruptive - but the external 3.3v will drop along with the battery level, so we should use the more stable (I hope) internal 1.7v.
// The alternative is to build a more stable buck/boost regulator for reference...
batteryLevel = analogRead(BATTERYPIN);
/* LiIon charge to a max of 4.2v; and we should not let them discharge below about 3.5v.
* With a resistor voltage divider of Z1=39k, Z2=10k we're looking at roughly 20.4% of
* those values: (10/49) * 4.2 = 0.857v, and (10/49) * 3.5 = 0.714v. Since the external
* voltage reference flags as the battery drops, we can't use that as an absolute
* reference. So using the INTERNAL 1.1v reference, that should give us a reasonable
* range, in theory; the math shows the internal reference to be about 1.27v (assuming
* the resistors are indeed 39k and 10k, which is almost certainly also wrong). But
* then the high end would be 172, and the low end is about 142, which matches my
* actual readings here very well.
*
* Actual measurements:
* 3.46v = 144 - 146
* 4.21v = 172
*/
#if 0
Serial.print("battery: ");
println(batteryLevel);
#endif
if (batteryLevel < 146)
batteryLevel = 146;
if (batteryLevel > 168)
batteryLevel = 168;
batteryLevel = map(batteryLevel, 146, 168, 0, 100);
g_ui->drawPercentageUIElement(UIePowerPercentage, batteryLevel);
}
} else {
threads.delay(10);
// threads.yield();
}
}
}
// FIXME: figure out how to limit this to 30 FPS (or whatver) so we can
// appropriately use threads.yield()
void runDisplay()
{
while (1) {
{
Threads::Scope lock(displaylock);
doDebugging();
// FIXME: this is sometimes *VERY* slow.
uint32_t startDisp = millis();
uint32_t cpuBefore = g_cpu->cycles;
g_ui->blit();
g_vm->vmdisplay->lockDisplay();
if (g_vm->vmdisplay->needsRedraw()) { // necessary for the VM to redraw
// Used to get the dirty rect and blit just that rect. Could still do,
// but instead, I'm just wildly wasting resources. MWAHAHAHA
// AiieRect what = g_vm->vmdisplay->getDirtyRect();
g_vm->vmdisplay->didRedraw();
// g_display->blit(what);
}
g_display->blit(); // Blit the whole thing, including UI area
g_vm->vmdisplay->unlockDisplay();
uint32_t dispTime = millis() - startDisp;
uint32_t cpuAfter = g_cpu->cycles;
if (dispTime > 75) {
Serial.print("Slow blit: ");
Serial.print(dispTime);
Serial.print(" cpu ran: ");
Serial.println(cpuAfter - cpuBefore);
}
}
}
}
void runCPU()
{
g_inInterrupt = true;
// Debugging: to watch when the speaker is triggered...
// static bool debugState = false;
// debugState = !debugState;
// digitalWrite(56, debugState);
// Relatively critical timing: CPU needs to run ahead at least 4
// cycles, b/c we're calling this interrupt (runCPU, that is) just
// about 1/3 as fast as we should; and the speaker is updated
// directly from within it, so it needs to be real-ish time.
if (micros() > nextInstructionMicros) {
// Debugging: to watch when the CPU is triggered...
// static bool debugState = false;
// debugState = !debugState;
// digitalWrite(56, debugState);
uint8_t executed = g_cpu->Run(24);
uint32_t nextInstructionMicros;
uint32_t startMicros;
startMicros = nextInstructionMicros = micros();
// The CPU of the Apple //e ran at 1.023 MHz. Adjust when we think
// the next instruction should run based on how long the execution
// was ((1000/1023) * numberOfCycles) - which is about 97.8%.
nextInstructionMicros = startMicros + ((double)g_cpu->cycles * (double)SPEEDCTL);
((AppleVM *)g_vm)->cpuMaintenance(g_cpu->cycles);
uint32_t startMillis = millis();
Serial.println("CPU thread is started");
while (1) {
// Relatively critical timing: CPU needs to run ahead at least 4
// cycles, b/c we're calling this interrupt (runCPU, that is) just
// about 1/3 as fast as we should; and the speaker is updated
// directly from within it, so it needs to be real-ish time.
if (micros() >= nextInstructionMicros) {
uint32_t expectedCycles = (micros() - startMicros) * SPEEDCTL;
uint8_t executed;
cpulock.lock(); // Blocking; if the BIOS is running, we stall here
executed = g_cpu->Run(24);
cpulock.unlock();
// The CPU of the Apple //e ran at 1.023 MHz. Adjust when we think
// the next instruction should run based on how long the execution
// was ((1000/1023) * numberOfCycles) - which is about 97.8%.
if (expectedCycles > g_cpu->cycles) {
nextInstructionMicros = micros();
#if 0
// show a warning on serial about our current performance
double percentage = ((double)g_cpu->cycles / (double)expectedCycles) * 100.0;
static uint32_t nextWarningTime = 0;
if (millis() > nextWarningTime) {
static char buf[100];
sprintf(buf, "CPU running at %f%% of %d", percentage, g_speed);
Serial.println(buf);
nextWarningTime = millis() + 1000;
}
#endif
} else {
nextInstructionMicros = startMicros + ((double)g_cpu->cycles * (double)SPEEDCTL);
}
((AppleVM *)g_vm)->cpuMaintenance(g_cpu->cycles);
} else {
// threads.yield();
threads.delay(1);
}
}
g_inInterrupt = false;
}
void loop()
{
if (digitalRead(RESETPIN) == LOW) {
// This is the BIOS interrupt. We immediately act on it.
biosInterrupt();
}
resetButtonDebouncer.update();
g_keyboard->maintainKeyboard();
usb.maintain();
//debugLCDState = !debugLCDState;
//digitalWrite(57, debugLCDState);
doDebugging();
// FIXME: this is sometimes *VERY* slow.
uint32_t startDisp = millis();
uint32_t cpuBefore = g_cpu->cycles;
g_ui->blit();
g_vm->vmdisplay->lockDisplay();
if (g_vm->vmdisplay->needsRedraw()) { // necessary for the VM to redraw
// Used to get the dirty rect and blit just that rect. Could still do,
// but instead, I'm just wildly wasting resources. MWAHAHAHA
// AiieRect what = g_vm->vmdisplay->getDirtyRect();
g_vm->vmdisplay->didRedraw();
// g_display->blit(what);
}
g_display->blit(); // Blit the whole thing, including UI area
g_vm->vmdisplay->unlockDisplay();
uint32_t dispTime = millis() - startDisp;
uint32_t cpuAfter = g_cpu->cycles;
if (dispTime > 30) {
Serial.print("Slow blit: ");
Serial.print(dispTime);
Serial.print(" cpu ran: ");
Serial.println(cpuAfter - cpuBefore);
}
static unsigned long nextBattCheck = millis() + 30;// debugging
static int batteryLevel = 0; // static for debugging code! When done
// debugging, this can become a local
// in the appropriate block below
if (millis() >= nextBattCheck) {
// FIXME: what about rollover?
nextBattCheck = millis() + 3 * 1000; // check every 3 seconds
// This is a bit disruptive - but the external 3.3v will drop along with the battery level, so we should use the more stable (I hope) internal 1.7v.
// The alternative is to build a more stable buck/boost regulator for reference...
batteryLevel = analogRead(BATTERYPIN);
/* LiIon charge to a max of 4.2v; and we should not let them discharge below about 3.5v.
* With a resistor voltage divider of Z1=39k, Z2=10k we're looking at roughly 20.4% of
* those values: (10/49) * 4.2 = 0.857v, and (10/49) * 3.5 = 0.714v. Since the external
* voltage reference flags as the battery drops, we can't use that as an absolute
* reference. So using the INTERNAL 1.1v reference, that should give us a reasonable
* range, in theory; the math shows the internal reference to be about 1.27v (assuming
* the resistors are indeed 39k and 10k, which is almost certainly also wrong). But
* then the high end would be 172, and the low end is about 142, which matches my
* actual readings here very well.
*
* Actual measurements:
* 3.46v = 144 - 146
* 4.21v = 172
*/
#if 1
Serial.print("battery: ");
println(batteryLevel);
#endif
if (batteryLevel < 146)
batteryLevel = 146;
if (batteryLevel > 168)
batteryLevel = 168;
batteryLevel = map(batteryLevel, 146, 168, 0, 100);
g_ui->drawPercentageUIElement(UIePowerPercentage, batteryLevel);
if (g_writePrefsFromMainLoop) {
Serial.println("Writing prefs");
writePrefs();
g_writePrefsFromMainLoop = false;
}
}
@ -481,10 +568,7 @@ void writePrefs()
TeensyPrefs np;
prefs_t p;
g_display->clrScr();
g_display->drawString(M_SELECTED, 80, 100,"Writing prefs...");
g_display->flush();
Serial.println("writePrefs()");
p.magic = PREFSMAGIC;
p.prefsSize = sizeof(prefs_t);
p.version = PREFSVERSION;
@ -502,7 +586,5 @@ void writePrefs()
strcpy(p.hd1, ((AppleVM *)g_vm)->HDName(0));
strcpy(p.hd2, ((AppleVM *)g_vm)->HDName(1));
Timer1.stop();
bool ret = np.writePrefs(&p);
Timer1.start();
}