mirror of
https://github.com/JorjBauer/aiie.git
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420 lines
11 KiB
C++
420 lines
11 KiB
C++
#include <Arduino.h>
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#include <ff.h> // uSDFS
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#include <SPI.h>
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#include <EEPROM.h>
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#include <TimeLib.h>
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#include <TimerOne.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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#define RESETPIN 39
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#define BATTERYPIN A19
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#define SPEAKERPIN A21
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#include "globals.h"
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#include "teensy-crash.h"
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volatile float nextInstructionMicros;
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volatile float startMicros;
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FATFS fatfs; /* File system object */
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BIOS bios;
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enum {
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D_NONE = 0,
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D_SHOWFPS = 1,
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D_SHOWMEMFREE = 2,
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D_SHOWPADDLES = 3,
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D_SHOWPC = 4,
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D_SHOWCYCLES = 5,
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D_SHOWBATTERY = 6,
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D_SHOWTIME = 7
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};
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uint8_t debugMode = D_NONE;
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static time_t getTeensy3Time() { return Teensy3Clock.get(); }
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#define ESP_TXD 51
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#define ESP_CHPD 52
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#define ESP_RST 53
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#define ESP_RXD 40
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#define ESP_GPIO0 41
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#define ESP_GPIO2 42
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void setup()
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{
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Serial.begin(230400);
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/* while (!Serial) {
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; // wait for serial port to connect. Needed for Leonardo only
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}
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Serial.println("hi");
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*/
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delay(100); // let the serial port connect if it's gonna
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enableFaultHandler();
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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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Serial.println("RTC set from Teensy");
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} else {
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Serial.println("Error while setting RTC");
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}
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TCHAR *device = (TCHAR *)_T("0:/");
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f_mount (&fatfs, device, 0); /* Mount/Unmount a logical drive */
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pinMode(RESETPIN, INPUT);
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digitalWrite(RESETPIN, HIGH);
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analogReference(EXTERNAL); // 3.3v external, or 1.7v internal. We need 1.7 internal for the battery level, which means we're gonna have to do something about the paddles :/
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analogReadRes(8); // We only need 8 bits of resolution (0-255) for battery & paddles
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analogReadAveraging(4); // ?? dunno if we need this or not.
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analogWriteResolution(12);
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pinMode(SPEAKERPIN, OUTPUT); // analog speaker output, used as digital volume control
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pinMode(BATTERYPIN, INPUT);
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Serial.println("creating virtual hardware");
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g_speaker = new TeensySpeaker(SPEAKERPIN);
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Serial.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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Serial.println(" display");
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g_display = new TeensyDisplay();
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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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Serial.println(" cpu");
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g_cpu = new Cpu();
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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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Serial.println(" vm");
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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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Serial.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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Serial.println(" keyboard");
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g_keyboard = new TeensyKeyboard(g_vm->getKeyboard());
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Serial.println(" paddles");
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g_paddles = new TeensyPaddles(A23, A24, 1, 1);
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// Now that all the virtual hardware is glued together, reset the VM
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Serial.println("Resetting VM");
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g_vm->Reset();
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g_display->redraw();
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// g_display->blit();
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Serial.println("Reading prefs");
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readPrefs(); // read from eeprom and set anything we need setting
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Serial.println("free-running");
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startMicros = 0;
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nextInstructionMicros = micros();
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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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pinMode(56, OUTPUT);
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pinMode(57, OUTPUT);
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Timer1.initialize(3);
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Timer1.attachInterrupt(runCPU);
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Timer1.start();
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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 biosInterrupt()
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{
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Timer1.stop();
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// wait for the interrupt button to be released
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while (digitalRead(RESETPIN) == LOW)
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;
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// invoke the BIOS
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if (bios.runUntilDone()) {
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// if it returned true, we have something to store persistently in EEPROM.
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writePrefs();
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}
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// if we turned off debugMode, make sure to clear the debugMsg
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if (debugMode == D_NONE) {
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g_display->debugMsg("");
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}
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// clear the CPU next-step counters
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g_cpu->cycles = 0;
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nextInstructionMicros = micros();
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startMicros = micros();
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// Force the display to redraw
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((AppleDisplay*)(g_vm->vmdisplay))->modeChange();
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// Poll the keyboard before we start, so we can do selftest on startup
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g_keyboard->maintainKeyboard();
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Timer1.start();
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}
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//bool debugState = false;
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//bool debugLCDState = false;
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void runCPU()
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{
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if (micros() >= nextInstructionMicros) {
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// Debugging: to watch when the CPU is triggered...
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//debugState = !debugState;
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// digitalWrite(56, debugState);
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g_cpu->Run(24);
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// These are timing-critical, for the audio and paddles.
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// There's also a keyboard repeat in here that hopefully is
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// minimal overhead...
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g_speaker->beginMixing();
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((AppleVM *)g_vm)->cpuMaintenance(g_cpu->cycles);
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g_speaker->maintainSpeaker(g_cpu->cycles);
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// The CPU of the Apple //e ran at 1.023 MHz. Adjust when we think
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// the next instruction should run based on how long the execution
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// was ((1000/1023) * numberOfCycles) - which is about 97.8%.
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nextInstructionMicros = startMicros + (float)g_cpu->cycles * 0.978;
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}
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}
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void loop()
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{
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if (digitalRead(RESETPIN) == LOW) {
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// This is the BIOS interrupt. We immediately act on it.
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biosInterrupt();
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}
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((AppleVM*)g_vm)->disk6->fillDiskBuffer();
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g_keyboard->maintainKeyboard();
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//debugLCDState = !debugLCDState;
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//digitalWrite(57, debugLCDState);
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doDebugging();
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// Only redraw if the CPU is caught up; and then we'll suspend the
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// CPU to draw a full frame.
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// Note that this breaks audio, b/c it's real-time and requires the
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// CPU running to change the audio line's value. So we need to EITHER
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//
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// - delay the audio line by at least the time it takes for one
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// display update, OR
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// - lock display updates so the CPU can update the memory, but we
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// keep drawing what was going to be displayed
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//
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// The Timer1.stop()/start() is bad. Using it, the display doesn't
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// tear; but the audio is also broken. Taking it out, audio is good
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// but the display tears.
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Timer1.stop();
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g_vm->vmdisplay->lockDisplay();
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if (g_vm->vmdisplay->needsRedraw()) {
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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_vm->vmdisplay->unlockDisplay();
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Timer1.start();
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static unsigned long nextBattCheck = 0;
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static int batteryLevel = 0; // static for debugging code! When done
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// debugging, this can become a local
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// in the appropriate block below
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if (millis() >= nextBattCheck) {
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// FIXME: what about rollover?
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nextBattCheck = millis() + 3 * 1000; // check every 30 seconds
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// 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.
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// The alternative is to build a more stable buck/boost regulator for reference...
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analogReference(INTERNAL);
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batteryLevel = analogRead(BATTERYPIN);
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analogReference(EXTERNAL);
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/* LiIon charge to a max of 4.2v; and we should not let them discharge below about 3.5v.
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* With a resistor voltage divider of Z1=39k, Z2=10k we're looking at roughly 20.4% of
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* those values: (10/49) * 4.2 = 0.857v, and (10/49) * 3.5 = 0.714v. Since the external
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* voltage reference flags as the battery drops, we can't use that as an absolute
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* reference. So using the INTERNAL 1.1v reference, that should give us a reasonable
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* range, in theory; the math shows the internal reference to be about 1.27v (assuming
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* the resistors are indeed 39k and 10k, which is almost certainly also wrong). But
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* then the high end would be 172, and the low end is about 142, which matches my
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* actual readings here very well.
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*
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* Actual measurements:
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* 3.46v = 144 - 146
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* 4.21v = 172
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*/
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#if 1
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Serial.print("battery: ");
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Serial.println(batteryLevel);
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#endif
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if (batteryLevel < 146)
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batteryLevel = 146;
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if (batteryLevel > 168)
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batteryLevel = 168;
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batteryLevel = map(batteryLevel, 146, 168, 0, 100);
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g_display->drawBatteryStatus(batteryLevel);
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}
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}
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void doDebugging()
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{
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char buf[25];
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switch (debugMode) {
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case D_SHOWFPS:
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// display some FPS data
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static uint32_t startAt = millis();
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static uint32_t loopCount = 0;
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loopCount++;
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time_t lenSecs;
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lenSecs = (millis() - startAt) / 1000;
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if (lenSecs >= 5) {
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sprintf(buf, "%lu FPS", loopCount / lenSecs);
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g_display->debugMsg(buf);
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startAt = millis();
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loopCount = 0;
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}
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break;
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case D_SHOWMEMFREE:
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sprintf(buf, "%lu %u", FreeRamEstimate(), heapSize());
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g_display->debugMsg(buf);
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break;
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case D_SHOWPADDLES:
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sprintf(buf, "%u %u", g_paddles->paddle0(), g_paddles->paddle1());
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g_display->debugMsg(buf);
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break;
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case D_SHOWPC:
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sprintf(buf, "%X", g_cpu->pc);
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g_display->debugMsg(buf);
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break;
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case D_SHOWCYCLES:
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sprintf(buf, "%lX", g_cpu->cycles);
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g_display->debugMsg(buf);
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break;
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case D_SHOWBATTERY:
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sprintf(buf, "BAT %d", analogRead(BATTERYPIN));
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g_display->debugMsg(buf);
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break;
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case D_SHOWTIME:
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sprintf(buf, "%.2d:%.2d:%.2d", hour(), minute(), second());
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g_display->debugMsg(buf);
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break;
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}
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}
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typedef struct _prefs {
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uint32_t magic;
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int16_t volume;
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} prefs;
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// Fun trivia: the Apple //e was in production from January 1983 to
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// November 1993. And the 65C02 in them supported weird BCD math modes.
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#define MAGIC 0x01831093
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void readPrefs()
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{
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prefs p;
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uint8_t *pp = (uint8_t *)&p;
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Serial.println("reading prefs");
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for (uint8_t i=0; i<sizeof(prefs); i++) {
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*pp++ = EEPROM.read(i);
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}
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if (p.magic == MAGIC) {
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// looks valid! Use it.
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Serial.println("prefs valid! Restoring volume");
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if (p.volume > 15) {
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p.volume = 15;
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}
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if (p.volume < 0) {
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p.volume = 0;
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}
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g_volume = p.volume;
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return;
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}
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// use defaults
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g_volume = 0;
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}
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void writePrefs()
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{
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Serial.println("writing prefs");
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Timer1.stop();
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prefs p;
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uint8_t *pp = (uint8_t *)&p;
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p.magic = MAGIC;
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p.volume = g_volume;
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for (uint8_t i=0; i<sizeof(prefs); i++) {
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EEPROM.write(i, *pp++);
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}
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Timer1.start();
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}
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