mirror of
https://github.com/JorjBauer/aiie.git
synced 2024-10-31 09:15:51 +00:00
596 lines
18 KiB
C++
596 lines
18 KiB
C++
#include <Arduino.h>
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#include <TimeLib.h>
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#include <Bounce2.h>
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#include "bios.h"
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#include "cpu.h"
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#include "applevm.h"
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#include "teensy-display.h"
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#include "teensy-keyboard.h"
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#include "teensy-speaker.h"
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#include "teensy-paddles.h"
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#include "teensy-filemanager.h"
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#include "teensy-usb.h"
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#include "appleui.h"
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#include "teensy-prefs.h"
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#include "teensy-println.h"
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//#define DEBUG_TIMING
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#if F_CPU < 240000000
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#pragma AiiE warning: performance will improve if you overclock the Teensy to 240MHz (F_CPU=240MHz) or 256MHz (F_CPU=256MHz)
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#endif
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#if F_CPU == 600000000
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#pragma AiiE suggestion: if you underclock to 528MHz (F_CPU=528MHz) then it will use significantly less power, and still perform perfectly
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#endif
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#define RESETPIN 38
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#define DEBUGPIN 23
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#define BATTERYLEVEL 20 // analog reading of battery voltage (scaled to half)
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#define BATTERYSELECT 21 // digital select that turns on the power reading ckt
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#include "globals.h"
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#include "teensy-crash.h"
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BIOS bios;
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// How many microseconds per cycle
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#define SPEEDCTL ((float)1000000/(float)g_speed)
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static time_t getTeensy3Time() { return Teensy3Clock.get(); }
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TeensyUSB usb;
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Bounce resetButtonDebouncer = Bounce();
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volatile bool cpuClockInitialized = false;
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// The battery voltage measurement comes through a 50% ratio voltage
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// divider; and the analog resolution is set to 8 bits (so a max of
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// 256); with a fixed voltage reference of 3.3v (standard in the
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// Teensy 4.1). Since the voltage of a 16550 battery is 4.2v (at
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// 100%) to 2.5v (at 0%), that means we should expect the
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// currentBatteryReading to be about 97 - 163. Since this is
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// imperfect due to tolerance in the resistors and whatnot, we might
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// as well call that 100 - 160.
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volatile uint16_t currentBatteryReading = 0;
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volatile uint16_t currentBatteryCount = 0;
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volatile uint16_t currentBatterySum = 0;
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#define BATTERYMIN 100
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#define BATTERYMAX 160
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// how often should we read the battery level?
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#define BATTERYPERIOD (60 * 100000)
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// FIXME: abstract this into the USB code; doesn't belong in the root...
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#include "physicalkeyboard.h"
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// https://www.win.tue.nl/~aeb/linux/kbd/scancodes-14.html
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static uint8_t usb_scanmap[256] = {
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0, 0, 0, 0, // 0-3 don't exist
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'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', // keycodes 4-29
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'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
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'w', 'x', 'y', 'z',
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'1', '2', '3', '4', '5', '6', '7', '8', '9', '0', // keycodes 30-39
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PK_RET, // keycode 40
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PK_ESC, // 41
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PK_DEL, // 42
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PK_TAB,
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' ', // space bar
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'-', '=',
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'[', ']', '\\',
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0, // 50
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';', '\'', '`', ',', '.', '/',
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PK_LOCK, // 57
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 58-69, F1-F12 keys
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0, 0, 0, 0, 0, 0, 0, 0, 0, // PrtScr, scroll lock, pause, insert, home, PgUp, Delete, End, PgDown
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PK_RARR, PK_LARR, PK_DARR, PK_UARR, // 79-82, arrow keys
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0, // 83 num lock
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'/', '*', '-', '+', PK_RET, '0', '1', '2', // 84-99 keypad, which we just...
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'3', '4', '5', '6', '7', '8', '9', '.', // ... use as their "normal" keys
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0, // 100 undefined
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PK_RA, // 101: "application" key
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0, // 102 "power" key
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PK_CTRL, // 103 keypad '=' but it's my left control key
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PK_LSHFT, // 104, "f13" but it's my left shift key
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PK_LA, // 105: "f14" but it's my left alt key
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PK_LA, // 106: "f15" but it's the windows/command key
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PK_CTRL, // 107: "f16" but it's my right control key
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PK_RSHFT, // 108: "f17" but it's my right shift key
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PK_RA, // 109: "f18" but it's my right alt key
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 110-119
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 120-129
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0, 0, 0, // 130-132
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',', // 133: keypad ,
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'=', // 134: keypad =
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0, 0, 0, 0, 0, // 135-139
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 140-149
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 150-159
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 160-169
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 170-179
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 180-189
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 190-199
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 200-209
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 210-219
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0, 0, 0, 0, // 220-223
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PK_CTRL, // 224: left control (but not on my keyboard)
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PK_LSHFT, // 225: left shift (but not on my keyboard)
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PK_LA, PK_LA, // 226, 227: left alt, left GUI (but not on my keyboard)
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PK_CTRL, // 228: right control (but not on my keyboard)
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PK_RSHFT, // 229: right shift (but not on my keyboard)
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PK_RA, PK_RA, // 230, 231: right alt, right GUI (but not on my keyboard)
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0, 0, 0, 0, 0, 0, 0, 0, // 232-239
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 240-249
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0, 0, 0, 0, 0, 0 // 250-255
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};
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void onKeypress(uint8_t keycode)
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{
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((AppleVM *)g_vm)->getKeyboard()->keyDepressed(usb_scanmap[keycode]);
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}
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void onKeyrelease(uint8_t keycode)
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{
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((AppleVM *)g_vm)->getKeyboard()->keyReleased(usb_scanmap[keycode]);
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}
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void setup()
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{
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Serial.begin(230400);
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#if 0
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// Wait for USB serial connection before booting while debugging
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while (!Serial) {
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yield();
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}
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#endif
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delay(200); // let the power settle & serial to get its bearings
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pinMode(DEBUGPIN, OUTPUT); // for debugging
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pinMode(BATTERYSELECT, OUTPUT);
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digitalWrite(BATTERYSELECT, false); // leave it off by default
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pinMode(BATTERYLEVEL, INPUT);
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// enableFaultHandler();
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// SCB_SHCSR |= SCB_SHCSR_BUSFAULTENA | SCB_SHCSR_USGFAULTENA | SCB_SHCSR_MEMFAULTENA;
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// set the Time library to use Teensy 3.0's RTC to keep time
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setSyncProvider(getTeensy3Time);
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delay(100); // don't know if we need this
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if (timeStatus() == timeSet) {
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println("RTC set from Teensy");
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} else {
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println("Error while setting RTC");
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}
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pinMode(RESETPIN, INPUT);
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digitalWrite(RESETPIN, HIGH);
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analogReadRes(8); // We only need 8 bits of resolution (0-255) for paddles
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analogReadAveraging(4); // ?? dunno if we need this or not.
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println("creating virtual hardware");
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g_speaker = new TeensySpeaker(18, 19); // FIXME abstract constants
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println(" fm");
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// First create the filemanager - the interface to the host file system.
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g_filemanager = new TeensyFileManager();
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// Construct the interface to the host display. This will need the
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// VM's video buffer in order to draw the VM, but we don't have that
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// yet.
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println(" display");
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g_display = new TeensyDisplay();
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println(" UI");
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g_ui = new AppleUI();
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// Next create the virtual CPU. This needs the VM's MMU in order to
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// run, but we don't have that yet.
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println(" cpu");
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g_cpu = new Cpu();
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println(" usb");
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usb.init();
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usb.attachKeypress(onKeypress);
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usb.attachKeyrelease(onKeyrelease);
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// Create the virtual machine. This may read from g_filemanager to
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// get ROMs if necessary. (The actual Apple VM we've built has them
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// compiled in, though.) It will create its virutal hardware (MMU,
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// video driver, floppy, paddles, whatever).
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println(" vm");
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Serial.flush();
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g_vm = new AppleVM();
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// Now that the VM exists and it has created an MMU, we tell the CPU
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// how to access memory through the MMU.
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println(" [setMMU]");
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g_cpu->SetMMU(g_vm->getMMU());
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// And the physical keyboard needs hooks in to the virtual keyboard...
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println(" keyboard");
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g_keyboard = new TeensyKeyboard(g_vm->getKeyboard());
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println(" paddles");
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g_paddles = new TeensyPaddles(A3, A2, g_invertPaddleX, g_invertPaddleY);
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// Now that all the virtual hardware is glued together, reset the VM
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println("Resetting VM");
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g_vm->Reset();
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println("Reading prefs");
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readPrefs(); // read from eeprom and set anything we need setting
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g_speaker->begin(); // let the speaker reset its volume from g_volume
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// Debugging: insert a disk on startup...
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//((AppleVM *)g_vm)->insertDisk(0, "/A2DISKS/UTIL/mock2dem.dsk", false);
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//((AppleVM *)g_vm)->insertDisk(0, "/A2DISKS/JORJ/disk_s6d1.dsk", false);
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// ((AppleVM *)g_vm)->insertDisk(0, "/A2DISKS/GAMES/ALIBABA.DSK", false);
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resetButtonDebouncer.attach(RESETPIN);
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resetButtonDebouncer.interval(5); // ms
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println("Drawing UI border");
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g_display->redraw();
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println("free-running");
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Serial.flush();
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}
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// FIXME: move these memory-related functions elsewhere...
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// This only gives you an estimated free mem size. It's not perfect.
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uint32_t FreeRamEstimate()
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{
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uint32_t stackTop;
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uint32_t heapTop;
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// current position of the stack.
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stackTop = (uint32_t) &stackTop;
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// current position of heap.
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void* hTop = malloc(1);
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heapTop = (uint32_t) hTop;
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free(hTop);
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// The difference is the free, available ram.
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return stackTop - heapTop;
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}
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#include "malloc.h"
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int heapSize(){
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return mallinfo().uordblks;
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}
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void runMaintenance(uint32_t now)
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{
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static uint32_t nextRuntime = 0;
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if (now >= nextRuntime) {
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nextRuntime = now + 100000; // FIXME: what's a good time here? 1/10 sec?
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if (!resetButtonDebouncer.read()) {
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// This is the BIOS interrupt. Wait for it to clear and process it.
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while (!resetButtonDebouncer.read())
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resetButtonDebouncer.update();
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g_biosInterrupt = true;
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}
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if (!g_biosInterrupt) {
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g_keyboard->maintainKeyboard();
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usb.maintain();
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}
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}
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}
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#define TARGET_FPS 30
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void runDisplay(uint32_t now)
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{
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// When do we want to reset our expectation of "normal"?
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static uint32_t nextResetMicros = 0;
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// how many full display refreshes have we managed in this second?
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static uint32_t refreshCount = 0;
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// how many micros until the next frame refresh?
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static uint32_t microsAtStart = 0;
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static uint32_t microsForNext = micros();
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static uint32_t lastFps = 0;
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static uint32_t displayFrameCount = 0;
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// If it's time to draw the next frame, then do so
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if (now >= microsForNext) {
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refreshCount++;
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microsForNext = microsAtStart + (1000000.0*((float)refreshCount/(float)TARGET_FPS));
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doDebugging(lastFps);
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if (!g_biosInterrupt) {
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g_ui->blit();
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g_vm->vmdisplay->lockDisplay();
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if (g_vm->vmdisplay->needsRedraw()) { // necessary for the VM to redraw
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// Used to get the dirty rect and blit just that rect. Could still do,
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// but instead, I'm just wildly wasting resources. MWAHAHAHA
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// AiieRect what = g_vm->vmdisplay->getDirtyRect();
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g_vm->vmdisplay->didRedraw();
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// g_display->blit(what);
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}
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g_display->blit(); // Blit the whole thing, including UI area
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g_vm->vmdisplay->unlockDisplay();
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}
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}
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// Once a second, start counting all over again
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if (now >= nextResetMicros) {
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uint32_t newFrameCount = ((TeensyDisplay *)g_display)->frameCount();
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// There are two "FPS" counters here, actually. One is how often
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// we're polling the Apple //e memory to refresh the DMA buffer,
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// and to show that, we'd use this:
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// lastFps = refreshCount;
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// The other is how often the DMA code is refreshing the actual
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// display, and to show that, we'd use this:
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lastFps = newFrameCount - displayFrameCount;
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#ifdef DEBUG_TIMING
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// ... and this debugging code shows both.
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println("DMA buffer refresh at ", refreshCount, " FPS");
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println("Display refresh at ", newFrameCount - displayFrameCount, " FPS");
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#endif
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displayFrameCount = newFrameCount;
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nextResetMicros = now + 1000000;
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refreshCount = 0;
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microsAtStart = now;
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microsForNext = microsAtStart + (1000000.0*((float)refreshCount/(float)TARGET_FPS));
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}
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}
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// The debouncer is used in the bios, which blocks the main loop
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// execution; so this function updates the debouncer instead. It used
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// to be a thread of its own, but now that this is single-threaded
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// again, it's a standalone method.
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void runDebouncer()
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{
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static uint32_t nextRuntime = 0;
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if (millis() >= nextRuntime) {
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nextRuntime = millis() + 10;
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resetButtonDebouncer.update();
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} else {
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yield();
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}
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}
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void runBIOS(uint32_t now)
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{
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static uint32_t nextResetMicros = 0;
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static uint32_t countSinceLast = 0;
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static uint32_t microsAtStart = micros();
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static uint32_t microsForNext = microsAtStart + 100000; // 1/10 second
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if (now >= microsForNext) {
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microsForNext = now + 100000; // 1/10 second
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if (!bios.loop()) {
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g_biosInterrupt = false;
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}
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}
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}
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void runCPU(uint32_t now)
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{
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static uint32_t nextResetMicros = 0;
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static uint32_t countSinceLast = 0;
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static uint32_t microsAtStart = micros();
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static uint32_t microsForNext = microsAtStart + (countSinceLast * SPEEDCTL);
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// Allow the BIOS to reset our timing
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if (!cpuClockInitialized) {
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nextResetMicros = 0;
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countSinceLast = 0;
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microsAtStart = micros();
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microsForNext = microsAtStart + (countSinceLast * SPEEDCTL);
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cpuClockInitialized = true;
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}
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if (now >= microsForNext) {
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countSinceLast += g_cpu->Run(24); // The CPU runs in bursts of cycles. This '24' is the max burst we perform.
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((AppleVM *)g_vm)->cpuMaintenance(g_cpu->cycles);
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microsForNext = microsAtStart + (countSinceLast * SPEEDCTL);
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}
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if (now >= nextResetMicros) {
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nextResetMicros = now + 1000000;
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#ifdef DEBUG_TIMING
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float pct = (100.0 * (float)countSinceLast) / (float)g_speed;
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sprintf(debugBuf, "CPU running at %f%%", pct);
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println(debugBuf);
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#endif
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countSinceLast = 0;
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microsAtStart = now;
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microsForNext = microsAtStart + (countSinceLast * SPEEDCTL);
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}
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}
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void loop()
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{
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static uint32_t readingBattery = 0; // set to millis() + a settle time constant when we start reading
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static uint32_t nextReadBattery = micros() + BATTERYPERIOD;
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uint32_t now = micros();
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if (readingBattery && now >= readingBattery) {
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// Take 10 readings over a second and average them
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currentBatterySum += analogRead(BATTERYLEVEL);
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readingBattery = now + 100000; // 100 ms
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if (++currentBatteryCount >= 10) {
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currentBatteryReading = currentBatterySum / currentBatteryCount;
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readingBattery = 0;
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digitalWrite(BATTERYSELECT, false);
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nextReadBattery = now + BATTERYPERIOD;
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// Set up the displayed battery level
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if (currentBatteryReading < BATTERYMIN)
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currentBatteryReading = BATTERYMIN;
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if (currentBatteryReading > BATTERYMAX)
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currentBatteryReading = BATTERYMAX;
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((AppleUI *)g_ui)->drawBatteryStatus(map(currentBatteryReading,
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BATTERYMIN, BATTERYMAX,
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0, 100));
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}
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}
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else if (!readingBattery && now >= nextReadBattery) {
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// start reading the battery
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readingBattery = now + 1 * 1000000; // let it settle for 1 second
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currentBatterySum = 0;
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currentBatteryCount = 0;
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digitalWrite(BATTERYSELECT, true);
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}
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static bool wasBios = false; // so we can tell when it's done
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if (g_biosInterrupt) {
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runBIOS(now);
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wasBios = true;
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} else {
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if (wasBios) {
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// bios has just exited
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writePrefs();
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// Also might have changed the paddles state
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TeensyPaddles *tmp = (TeensyPaddles *)g_paddles;
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tmp->setRev(g_invertPaddleX, g_invertPaddleY);
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// if we turned off debugMode, make sure to clear the debugMsg
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if (g_debugMode == D_NONE) {
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g_display->debugMsg("");
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}
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// Drain the speaker queue (FIXME: a little hacky)
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|
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();
|
|
|
|
// Reset the CPU clock so it doesn't fast-forward
|
|
cpuClockInitialized = false;
|
|
|
|
// Reset the speaker so it picks up its new volume (FIXME kinda hacky)
|
|
g_speaker->begin();
|
|
|
|
wasBios = false;
|
|
}
|
|
}
|
|
|
|
if (!g_biosInterrupt) {
|
|
runCPU(now);
|
|
}
|
|
runDisplay(now);
|
|
runMaintenance(now);
|
|
runDebouncer();
|
|
}
|
|
|
|
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, "%llX", g_cpu->cycles);
|
|
g_display->debugMsg(debugBuf);
|
|
break;
|
|
case D_SHOWBATTERY:
|
|
sprintf(debugBuf, "B: %d %d%% ", currentBatteryReading,
|
|
map(currentBatteryReading, BATTERYMIN, BATTERYMAX, 0, 100));
|
|
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);
|
|
}
|