aiie/teensy/teensy.ino
2020-07-12 22:13:33 -04:00

446 lines
12 KiB
C++

#include <Arduino.h>
#include <Audio.h>
#include <SPI.h>
#include <TimeLib.h>
#include <Bounce2.h>
#include "bios.h"
#include "cpu.h"
#include "applevm.h"
#include "teensy-display.h"
#include "teensy-keyboard.h"
#include "teensy-speaker.h"
#include "teensy-paddles.h"
#include "teensy-filemanager.h"
#include "teensy-usb.h"
#include "appleui.h"
#include "teensy-prefs.h"
#include "teensy-println.h"
//#define DEBUG_TIMING
#define THREADED if (1)
#if F_CPU < 240000000
#pragma AiiE warning: performance will improve if you overclock the Teensy to 240MHz (F_CPU=240MHz) or 256MHz (F_CPU=256MHz)
#endif
#define RESETPIN 38
#define DEBUGPIN 23
#include "globals.h"
#include "teensy-crash.h"
BIOS bios;
// How many microseconds per cycle
#define SPEEDCTL ((float)1000000/(float)g_speed)
static time_t getTeensy3Time() { return Teensy3Clock.get(); }
TeensyUSB usb;
Bounce resetButtonDebouncer = Bounce();
void onKeypress(int unicode)
{
/*
shift/control/command are automatically applied
caps lock is oemkey 57
set the keyboard LED w/ ::capsLock(bool)
modifiers are <<8 bits for the right side:
command: 0x08; option/alt: 0x04; shift: 0x02; control: 0x01
F1..F12 are 194..205
Arrows: l/r/u/d 216/215/218/217
Delete: 127 (control-delete is 31)
home/pgup/down/delete/end: 210,211,214,212,213
numlock: oem 83
keypad: 210..218 as arrows &c, or digit ascii values w/ numlock on
enter: 10
*/
// vmkeyboard->keyDepressed(keypad.key[i].kchar);
}
void onKeyrelease(int unicode)
{
// vmkeyboard->keyReleased(keypad.key[i].kchar);
}
void setup()
{
Serial.begin(230400);
#if 1
// Wait for USB serial connection before booting while debugging
while (!Serial) {
yield();
}
#endif
delay(120); // let the power settle
pinMode(DEBUGPIN, OUTPUT); // for debugging
// enableFaultHandler();
// SCB_SHCSR |= SCB_SHCSR_BUSFAULTENA | SCB_SHCSR_USGFAULTENA | SCB_SHCSR_MEMFAULTENA;
// set the Time library to use Teensy 3.0's RTC to keep time
setSyncProvider(getTeensy3Time);
delay(100); // don't know if we need this
if (timeStatus() == timeSet) {
println("RTC set from Teensy");
} else {
println("Error while setting RTC");
}
pinMode(RESETPIN, INPUT);
digitalWrite(RESETPIN, HIGH);
analogReadRes(8); // We only need 8 bits of resolution (0-255) for paddles
analogReadAveraging(4); // ?? dunno if we need this or not.
println("creating virtual hardware");
g_speaker = new TeensySpeaker(18, 19); // FIXME abstract constants
println(" fm");
// First create the filemanager - the interface to the host file system.
g_filemanager = new TeensyFileManager();
// Construct the interface to the host display. This will need the
// VM's video buffer in order to draw the VM, but we don't have that
// yet.
println(" display");
g_display = new TeensyDisplay();
println(" UI");
g_ui = new AppleUI();
// Next create the virtual CPU. This needs the VM's MMU in order to
// run, but we don't have that yet.
println(" cpu");
g_cpu = new Cpu();
println(" usb");
usb.init();
usb.attachKeypress(onKeypress);
usb.attachKeyrelease(onKeyrelease);
// Create the virtual machine. This may read from g_filemanager to
// get ROMs if necessary. (The actual Apple VM we've built has them
// compiled in, though.) It will create its virutal hardware (MMU,
// video driver, floppy, paddles, whatever).
println(" vm");
Serial.flush();
g_vm = new AppleVM();
// Now that the VM exists and it has created an MMU, we tell the CPU
// how to access memory through the MMU.
println(" [setMMU]");
g_cpu->SetMMU(g_vm->getMMU());
// And the physical keyboard needs hooks in to the virtual keyboard...
println(" keyboard");
g_keyboard = new TeensyKeyboard(g_vm->getKeyboard());
println(" paddles");
g_paddles = new TeensyPaddles(A3, A2, g_invertPaddleX, g_invertPaddleY);
// Now that all the virtual hardware is glued together, reset the VM
println("Resetting VM");
g_vm->Reset();
println("Reading prefs");
readPrefs(); // read from eeprom and set anything we need setting
// 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);
resetButtonDebouncer.attach(RESETPIN);
resetButtonDebouncer.interval(5); // ms
println("Drawing UI border");
g_display->redraw();
println("free-running");
Serial.flush();
// threads.setMicroTimer(); // use a 100uS timer instead of a 1mS timer
// threads.setSliceMicros(5);
// threads.addThread(runDebouncer);
}
// FIXME: move these memory-related functions elsewhere...
// This only gives you an estimated free mem size. It's not perfect.
uint32_t FreeRamEstimate()
{
uint32_t stackTop;
uint32_t heapTop;
// current position of the stack.
stackTop = (uint32_t) &stackTop;
// current position of heap.
void* hTop = malloc(1);
heapTop = (uint32_t) hTop;
free(hTop);
// The difference is the free, available ram.
return stackTop - heapTop;
}
#include "malloc.h"
int heapSize(){
return mallinfo().uordblks;
}
void biosInterrupt()
{
// wait for the interrupt button to be released
while (!resetButtonDebouncer.read())
;
// invoke the BIOS
if (bios.runUntilDone()) {
// if it returned true, we have something to store persistently in EEPROM.
writePrefs();
// Also might have changed the paddles state
TeensyPaddles *tmp = (TeensyPaddles *)g_paddles;
tmp->setRev(g_invertPaddleX, g_invertPaddleY);
}
// if we turned off debugMode, make sure to clear the debugMsg
if (g_debugMode == D_NONE) {
g_display->debugMsg("");
}
// Drain the speaker queue (FIXME: a little hacky)
g_speaker->maintainSpeaker(-1, -1);
// Force the display to redraw
g_display->redraw(); // Redraw the UI
((AppleDisplay*)(g_vm->vmdisplay))->modeChange(); // force a full re-draw and blit
// Poll the keyboard before we start, so we can do selftest on startup
g_keyboard->maintainKeyboard();
}
void runMaintenance(uint32_t now)
{
static uint32_t nextRuntime = 0;
THREADED {
if (now >= nextRuntime) {
nextRuntime = now + 100000; // FIXME: what's a good time here? 1/10 sec?
if (!resetButtonDebouncer.read()) {
// This is the BIOS interrupt. We immediately act on it.
biosInterrupt();
}
g_keyboard->maintainKeyboard();
usb.maintain();
}
}
}
#define TARGET_FPS 30
void runDisplay(uint32_t now)
{
// When do we want to reset our expectation of "normal"?
static uint32_t nextResetMicros = 0;
// how many full display refreshes have we managed in this second?
static uint32_t refreshCount = 0;
// how many micros until the next frame refresh?
static uint32_t microsAtStart = 0;
static uint32_t microsForNext = micros();
static uint32_t lastFps = 0;
THREADED {
// If it's time to draw the next frame, then do so
if (now >= microsForNext) {
refreshCount++;
microsForNext = microsAtStart + (1000000.0*((float)refreshCount/(float)TARGET_FPS));
doDebugging(lastFps);
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();
}
// Once a second, start counting all over again
if (now >= nextResetMicros) {
lastFps = refreshCount;
#ifdef DEBUG_TIMING
println("Display running at ", lastFps, " FPS");
#endif
nextResetMicros = now + 1000000;
refreshCount = 0;
microsAtStart = now;
microsForNext = microsAtStart + (1000000.0*((float)refreshCount/(float)TARGET_FPS));
}
}
}
// The debouncer is used in the bios, which blocks the main loop
// execution; so this thread updates the debouncer instead.
void runDebouncer()
{
static uint32_t nextRuntime = 0;
while (1) {
if (millis() >= nextRuntime) {
nextRuntime = millis() + 10;
resetButtonDebouncer.update();
} else {
yield();
// threads.yield();
}
}
}
void runCPU(uint32_t now)
{
static uint32_t nextResetMicros = 0;
static uint32_t countSinceLast = 0;
static uint32_t microsAtStart = micros();
static uint32_t microsForNext = microsAtStart + (countSinceLast * SPEEDCTL);
THREADED {
if (now >= microsForNext) {
countSinceLast += g_cpu->Run(24); // The CPU runs in bursts of cycles. This '24' is the max burst we perform.
((AppleVM *)g_vm)->cpuMaintenance(g_cpu->cycles);
microsForNext = microsAtStart + (countSinceLast * SPEEDCTL);
}
if (now >= nextResetMicros) {
nextResetMicros = now + 1000000;
#ifdef DEBUG_TIMING
float pct = (100.0 * (float)countSinceLast) / (float)g_speed;
sprintf(debugBuf, "CPU running at %f%%", pct);
println(debugBuf);
#endif
countSinceLast = 0;
microsAtStart = now;
microsForNext = microsAtStart + (countSinceLast * SPEEDCTL);
}
}
}
void loop()
{
uint32_t now = micros();
runCPU(now);
runDisplay(now);
runMaintenance(now);
}
void doDebugging(uint32_t lastFps)
{
switch (g_debugMode) {
case D_SHOWFPS:
sprintf(debugBuf, "%lu FPS", lastFps);
g_display->debugMsg(debugBuf);
break;
case D_SHOWMEMFREE:
sprintf(debugBuf, "%lu %u", FreeRamEstimate(), heapSize());
g_display->debugMsg(debugBuf);
break;
case D_SHOWPADDLES:
sprintf(debugBuf, "%u %u", g_paddles->paddle0(), g_paddles->paddle1());
g_display->debugMsg(debugBuf);
break;
case D_SHOWPC:
sprintf(debugBuf, "%X", g_cpu->pc);
g_display->debugMsg(debugBuf);
break;
case D_SHOWCYCLES:
sprintf(debugBuf, "%lX", g_cpu->cycles);
g_display->debugMsg(debugBuf);
break;
case D_SHOWTIME:
sprintf(debugBuf, "%.2d:%.2d:%.2d", hour(), minute(), second());
g_display->debugMsg(debugBuf);
break;
case D_SHOWDSK:
{
uint8_t sd = ((AppleVM *)g_vm)->disk6->selectedDrive();
sprintf(debugBuf, "s %d t %d",
sd,
((AppleVM *)g_vm)->disk6->headPosition(sd));
g_display->debugMsg(debugBuf);
}
break;
}
}
void readPrefs()
{
TeensyPrefs np;
prefs_t p;
if (np.readPrefs(&p)) {
g_volume = p.volume;
g_displayType = p.displayType;
g_debugMode = p.debug;
g_speed = (p.speed * (1023000/2)); // steps of half normal speed
if (g_speed < (1023000/2))
g_speed = (1023000/2);
if (p.disk1[0]) {
((AppleVM *)g_vm)->insertDisk(0, p.disk1);
}
if (p.disk2[0]) {
((AppleVM *)g_vm)->insertDisk(1, p.disk2);
}
if (p.hd1[0]) {
((AppleVM *)g_vm)->insertHD(0, p.hd1);
}
if (p.hd2[0]) {
((AppleVM *)g_vm)->insertHD(1, p.hd2);
}
}
g_invertPaddleX = p.invertPaddleX;
g_invertPaddleY = p.invertPaddleY;
// Update the paddles with the new inversion state
((TeensyPaddles *)g_paddles)->setRev(g_invertPaddleX, g_invertPaddleY);
}
void writePrefs()
{
TeensyPrefs np;
prefs_t p;
p.magic = PREFSMAGIC;
p.prefsSize = sizeof(prefs_t);
p.version = PREFSVERSION;
p.invertPaddleX = g_invertPaddleX;
p.invertPaddleY = g_invertPaddleY;
p.volume = g_volume;
p.displayType = g_displayType;
p.debug = g_debugMode;
p.speed = g_speed / (1023000/2);
strcpy(p.disk1, ((AppleVM *)g_vm)->DiskName(0));
strcpy(p.disk2, ((AppleVM *)g_vm)->DiskName(1));
strcpy(p.hd1, ((AppleVM *)g_vm)->HDName(0));
strcpy(p.hd2, ((AppleVM *)g_vm)->HDName(1));
bool ret = np.writePrefs(&p);
}