mirror of
https://github.com/TomHarte/CLK.git
synced 2024-11-19 08:31:11 +00:00
667 lines
18 KiB
C++
667 lines
18 KiB
C++
//
|
|
// Electron.cpp
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 03/01/2016.
|
|
// Copyright © 2016 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#include "Electron.hpp"
|
|
|
|
#include <algorithm>
|
|
|
|
using namespace Electron;
|
|
|
|
static const unsigned int cycles_per_line = 128;
|
|
static const unsigned int cycles_per_frame = 312*cycles_per_line;
|
|
static const unsigned int crt_cycles_multiplier = 8;
|
|
static const unsigned int crt_cycles_per_line = crt_cycles_multiplier * cycles_per_line;
|
|
|
|
const int first_graphics_line = 28;
|
|
|
|
Machine::Machine() :
|
|
_interruptControl(0),
|
|
_frameCycles(0),
|
|
_displayOutputPosition(0),
|
|
_audioOutputPosition(0),
|
|
_audioOutputPositionError(0),
|
|
_currentOutputLine(0),
|
|
_tape({.is_running = false, .dataRegister = 0})
|
|
{
|
|
memset(_keyStates, 0, sizeof(_keyStates));
|
|
memset(_palette, 0xf, sizeof(_palette));
|
|
_crt = new Outputs::CRT(crt_cycles_per_line, 312, 1, 1);
|
|
_interruptStatus = 0x02;
|
|
for(int c = 0; c < 16; c++)
|
|
memset(_roms[c], 0xff, 16384);
|
|
|
|
_speaker.set_input_rate(125000);
|
|
}
|
|
|
|
Machine::~Machine()
|
|
{
|
|
}
|
|
|
|
unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uint16_t address, uint8_t *value)
|
|
{
|
|
unsigned int cycles = 1;
|
|
|
|
if(address < 0x8000)
|
|
{
|
|
if(isReadOperation(operation))
|
|
{
|
|
*value = _ram[address];
|
|
}
|
|
else
|
|
{
|
|
// If we're still before the display will start to be painted, or the address is
|
|
// less than both the current line address and 0x3000, (the minimum screen mode
|
|
// base address) then there's no way this write can affect the current frame. Sp
|
|
// no need to flush the display. Otherwise, output up until now so that any
|
|
// write doesn't have retroactive effect on the video output.
|
|
if(!(
|
|
(_frameCycles < first_graphics_line * cycles_per_line) ||
|
|
(address < _startLineAddress && address < 0x3000)
|
|
))
|
|
update_display();
|
|
|
|
_ram[address] = *value;
|
|
}
|
|
|
|
// for the entire frame, RAM is accessible only on odd cycles; in modes below 4
|
|
// it's also accessible only outside of the pixel regions
|
|
cycles += (_frameCycles&1)^1;
|
|
if(_screenMode < 4)
|
|
{
|
|
const int current_line = _frameCycles >> 7;
|
|
const int line_position = _frameCycles & 127;
|
|
if(current_line >= first_graphics_line && current_line < first_graphics_line+256 && line_position >= 24 && line_position < 104)
|
|
cycles = (unsigned int)(104 - line_position);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if(address >= 0xc000)
|
|
{
|
|
if((address & 0xff00) == 0xfe00)
|
|
{
|
|
// printf("%c: %02x: ", isReadOperation(operation) ? 'r' : 'w', *value);
|
|
|
|
switch(address&0xf)
|
|
{
|
|
case 0x0:
|
|
if(isReadOperation(operation))
|
|
{
|
|
*value = _interruptStatus;
|
|
_interruptStatus &= ~0x02;
|
|
}
|
|
else
|
|
{
|
|
_interruptControl = *value;
|
|
evaluate_interrupts();
|
|
}
|
|
break;
|
|
case 0x1:
|
|
break;
|
|
case 0x2:
|
|
_startScreenAddress = (_startScreenAddress & 0xfe00) | (uint16_t)(((*value) & 0xe0) << 1);
|
|
break;
|
|
case 0x3:
|
|
_startScreenAddress = (_startScreenAddress & 0x01ff) | (uint16_t)(((*value) & 0x3f) << 9);
|
|
break;
|
|
case 0x4:
|
|
if(isReadOperation(operation))
|
|
{
|
|
*value = (uint8_t)(_tape.dataRegister >> 2);
|
|
_interruptStatus &= ~Interrupt::TransmitDataEmpty;
|
|
evaluate_interrupts();
|
|
}
|
|
else
|
|
{
|
|
}
|
|
// printf("Cassette\n");
|
|
break;
|
|
case 0x5:
|
|
if(!isReadOperation(operation))
|
|
{
|
|
const uint8_t interruptDisable = (*value)&0xf0;
|
|
if( interruptDisable )
|
|
{
|
|
if( interruptDisable&0x10 ) _interruptStatus &= ~Interrupt::DisplayEnd;
|
|
if( interruptDisable&0x20 ) _interruptStatus &= ~Interrupt::RealTimeClock;
|
|
if( interruptDisable&0x40 ) _interruptStatus &= ~Interrupt::HighToneDetect;
|
|
evaluate_interrupts();
|
|
// TODO: NMI (?)
|
|
}
|
|
// else
|
|
{
|
|
uint8_t nextROM = (*value)&0xf;
|
|
|
|
// if(nextROM&0x08)
|
|
// {
|
|
// _activeRom = (Electron::ROMSlot)(nextROM&0x0e);
|
|
// printf("%d -> Paged %d\n", nextROM, _activeRom);
|
|
// }
|
|
if(((_activeRom&12) != 8) || (nextROM&8))
|
|
{
|
|
_activeRom = (Electron::ROMSlot)nextROM;
|
|
}
|
|
// else
|
|
// {
|
|
// printf("Ignored!");
|
|
// }
|
|
// printf("%d -> Paged %d\n", nextROM, _activeRom);
|
|
}
|
|
}
|
|
break;
|
|
case 0x6:
|
|
if(!isReadOperation(operation))
|
|
{
|
|
update_audio();
|
|
_speaker.set_divider(*value);
|
|
}
|
|
break;
|
|
case 0x7:
|
|
if(!isReadOperation(operation))
|
|
{
|
|
// update screen mode
|
|
uint8_t new_screen_mode = ((*value) >> 3)&7;
|
|
if(new_screen_mode == 7) new_screen_mode = 4;
|
|
if(new_screen_mode != _screenMode)
|
|
{
|
|
update_display();
|
|
_screenMode = new_screen_mode;
|
|
switch(_screenMode)
|
|
{
|
|
case 0: case 1: case 2: _screenModeBaseAddress = 0x3000; break;
|
|
case 3: _screenModeBaseAddress = 0x4000; break;
|
|
case 4: case 5: _screenModeBaseAddress = 0x5800; break;
|
|
case 6: _screenModeBaseAddress = 0x6000; break;
|
|
}
|
|
}
|
|
|
|
// update speaker mode
|
|
bool new_speaker_is_enabled = (*value & 6) == 2;
|
|
if(new_speaker_is_enabled != _speaker.get_is_enabled())
|
|
{
|
|
update_audio();
|
|
_speaker.set_is_enabled(new_speaker_is_enabled);
|
|
}
|
|
|
|
// TODO: tape mode, tape motor, caps lock LED
|
|
_tape.is_running = ((*value)&0x40) ? true : false;
|
|
}
|
|
break;
|
|
default:
|
|
{
|
|
if(!isReadOperation(operation))
|
|
{
|
|
update_display();
|
|
|
|
static const int registers[4][4] = {
|
|
{10, 8, 2, 0},
|
|
{14, 12, 6, 4},
|
|
{15, 13, 7, 5},
|
|
{11, 9, 3, 1},
|
|
};
|
|
const int index = (address >> 1)&3;
|
|
const uint8_t colour = ~(*value);
|
|
if(address&1)
|
|
{
|
|
_palette[registers[index][0]] = (_palette[registers[index][0]]&3) | ((colour >> 1)&4);
|
|
_palette[registers[index][1]] = (_palette[registers[index][1]]&3) | ((colour >> 0)&4);
|
|
_palette[registers[index][2]] = (_palette[registers[index][2]]&3) | ((colour << 1)&4);
|
|
_palette[registers[index][3]] = (_palette[registers[index][3]]&3) | ((colour << 2)&4);
|
|
|
|
_palette[registers[index][2]] = (_palette[registers[index][2]]&5) | ((colour >> 4)&2);
|
|
_palette[registers[index][3]] = (_palette[registers[index][3]]&5) | ((colour >> 3)&2);
|
|
}
|
|
else
|
|
{
|
|
_palette[registers[index][0]] = (_palette[registers[index][0]]&6) | ((colour >> 7)&1);
|
|
_palette[registers[index][1]] = (_palette[registers[index][1]]&6) | ((colour >> 6)&1);
|
|
_palette[registers[index][2]] = (_palette[registers[index][2]]&6) | ((colour >> 5)&1);
|
|
_palette[registers[index][3]] = (_palette[registers[index][3]]&6) | ((colour >> 4)&1);
|
|
|
|
_palette[registers[index][0]] = (_palette[registers[index][0]]&5) | ((colour >> 2)&2);
|
|
_palette[registers[index][1]] = (_palette[registers[index][1]]&5) | ((colour >> 1)&2);
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if(isReadOperation(operation))
|
|
*value = _os[address & 16383];
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if(isReadOperation(operation))
|
|
{
|
|
switch(_activeRom)
|
|
{
|
|
case ROMSlotKeyboard:
|
|
case ROMSlotKeyboard+1:
|
|
*value = 0xf0;
|
|
for(int address_line = 0; address_line < 14; address_line++)
|
|
{
|
|
if(!(address&(1 << address_line))) *value |= _keyStates[address_line];
|
|
}
|
|
break;
|
|
default:
|
|
*value = _roms[_activeRom][address & 16383];
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// if(operation == CPU6502::BusOperation::ReadOpcode)
|
|
// {
|
|
// printf("%04x: %02x (%d)\n", address, *value, _frameCycles);
|
|
// }
|
|
|
|
_frameCycles += cycles;
|
|
switch(_frameCycles)
|
|
{
|
|
case 64*128:
|
|
case 196*128:
|
|
update_audio();
|
|
break;
|
|
|
|
case 128*128:
|
|
update_audio();
|
|
signal_interrupt(Interrupt::RealTimeClock);
|
|
break;
|
|
|
|
case 284*128:
|
|
update_audio();
|
|
signal_interrupt(Interrupt::DisplayEnd);
|
|
break;
|
|
|
|
case cycles_per_frame:
|
|
update_display();
|
|
update_audio();
|
|
_frameCycles = 0;
|
|
_displayOutputPosition = 0;
|
|
_audioOutputPosition = 0;
|
|
_currentOutputLine = 0;
|
|
break;
|
|
}
|
|
|
|
if(_tape.is_running && _tape.media != nullptr)
|
|
{
|
|
_tape.time_into_pulse += (unsigned int)_tape.pulseStepper->step();
|
|
if(_tape.time_into_pulse == _tape.currentPulse.length.length)
|
|
{
|
|
get_next_tape_pulse();
|
|
|
|
_tape.crossings[0] = _tape.crossings[1];
|
|
_tape.crossings[1] = _tape.crossings[2];
|
|
_tape.crossings[2] = _tape.crossings[3];
|
|
|
|
_tape.crossings[3] = Tape::Unrecognised;
|
|
if(_tape.currentPulse.type != Storage::Tape::Pulse::Zero)
|
|
{
|
|
float pulse_length = (float)_tape.currentPulse.length.length / (float)_tape.currentPulse.length.clock_rate;
|
|
if(pulse_length > 0.4 / 2400.0 && pulse_length < 0.6 / 2400.0) _tape.crossings[3] = Tape::Short;
|
|
if(pulse_length > 0.4 / 1200.0 && pulse_length < 0.6 / 1200.0) _tape.crossings[3] = Tape::Long;
|
|
}
|
|
|
|
if(_tape.crossings[0] == Tape::Long && _tape.crossings[1] == Tape::Long)
|
|
{
|
|
push_tape_bit(0);
|
|
_tape.crossings[1] = Tape::Unrecognised;
|
|
}
|
|
else
|
|
{
|
|
if(_tape.crossings[0] == Tape::Short && _tape.crossings[1] == Tape::Short && _tape.crossings[2] == Tape::Short && _tape.crossings[3] == Tape::Short)
|
|
{
|
|
push_tape_bit(1);
|
|
_tape.crossings[3] = Tape::Unrecognised;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return cycles;
|
|
}
|
|
|
|
void Machine::set_tape(std::shared_ptr<Storage::Tape> tape)
|
|
{
|
|
_tape.media = tape;
|
|
get_next_tape_pulse();
|
|
}
|
|
|
|
inline void Machine::get_next_tape_pulse()
|
|
{
|
|
_tape.time_into_pulse = 0;
|
|
_tape.currentPulse = _tape.media->get_next_pulse();
|
|
if(_tape.pulseStepper == nullptr || _tape.currentPulse.length.clock_rate != _tape.pulseStepper->get_output_rate())
|
|
{
|
|
_tape.pulseStepper = std::shared_ptr<SignalProcessing::Stepper>(new SignalProcessing::Stepper(_tape.currentPulse.length.clock_rate, 2000000));
|
|
}
|
|
}
|
|
|
|
inline void Machine::push_tape_bit(uint16_t bit)
|
|
{
|
|
_tape.dataRegister = (uint16_t)((_tape.dataRegister >> 1) | (bit << 10));
|
|
|
|
if(_tape.bits_since_start)
|
|
{
|
|
_tape.bits_since_start--;
|
|
|
|
if(_tape.bits_since_start == 7)
|
|
{
|
|
_interruptStatus &= ~Interrupt::TransmitDataEmpty;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if((_tape.dataRegister&0x3) == 0x1)
|
|
{
|
|
_interruptStatus |= Interrupt::TransmitDataEmpty;
|
|
_tape.bits_since_start = 9;
|
|
}
|
|
|
|
if(_tape.dataRegister == 0x3ff)
|
|
_interruptStatus |= Interrupt::HighToneDetect;
|
|
else
|
|
_interruptStatus &= ~Interrupt::HighToneDetect;
|
|
}
|
|
// printf(".");
|
|
|
|
evaluate_interrupts();
|
|
}
|
|
|
|
void Machine::set_rom(ROMSlot slot, size_t length, const uint8_t *data)
|
|
{
|
|
uint8_t *target = nullptr;
|
|
switch(slot)
|
|
{
|
|
case ROMSlotOS: target = _os; break;
|
|
default: target = _roms[slot]; break;
|
|
}
|
|
|
|
memcpy(target, data, std::min((size_t)16384, length));
|
|
}
|
|
|
|
inline void Machine::signal_interrupt(Electron::Interrupt interrupt)
|
|
{
|
|
_interruptStatus |= interrupt;
|
|
evaluate_interrupts();
|
|
}
|
|
|
|
inline void Machine::evaluate_interrupts()
|
|
{
|
|
if(_interruptStatus & _interruptControl)
|
|
{
|
|
_interruptStatus |= 1;
|
|
}
|
|
else
|
|
{
|
|
_interruptStatus &= ~1;
|
|
}
|
|
set_irq_line(_interruptStatus & 1);
|
|
}
|
|
|
|
inline void Machine::update_audio()
|
|
{
|
|
int difference = _frameCycles - _audioOutputPosition;
|
|
_audioOutputPosition = _frameCycles;
|
|
_speaker.run_for_cycles((_audioOutputPositionError + difference) >> 4);
|
|
_audioOutputPositionError = (_audioOutputPositionError + difference)&15;
|
|
}
|
|
|
|
inline void Machine::update_display()
|
|
{
|
|
const int lines_of_hsync = 3;
|
|
const int end_of_hsync = lines_of_hsync * cycles_per_line;
|
|
|
|
if(_frameCycles >= end_of_hsync)
|
|
{
|
|
// assert sync for the first three lines of the display, with a break at the end for horizontal alignment
|
|
if(_displayOutputPosition < end_of_hsync)
|
|
{
|
|
for(int c = 0; c < lines_of_hsync; c++)
|
|
{
|
|
_crt->output_sync(119 * crt_cycles_multiplier);
|
|
_crt->output_blank(9 * crt_cycles_multiplier);
|
|
}
|
|
_displayOutputPosition = end_of_hsync;
|
|
}
|
|
|
|
while(_displayOutputPosition >= end_of_hsync && _displayOutputPosition < _frameCycles)
|
|
{
|
|
const int current_line = _displayOutputPosition >> 7;
|
|
const int line_position = _displayOutputPosition & 127;
|
|
|
|
// all lines then start with 9 cycles of sync
|
|
if(!line_position)
|
|
{
|
|
_crt->output_sync(9 * crt_cycles_multiplier);
|
|
_displayOutputPosition += 9;
|
|
}
|
|
else
|
|
{
|
|
bool isBlankLine =
|
|
((_screenMode == 3) || (_screenMode == 6)) ?
|
|
((current_line < first_graphics_line || current_line >= first_graphics_line+248) || (((current_line - first_graphics_line)%10) > 7)) :
|
|
((current_line < first_graphics_line || current_line >= first_graphics_line+256));
|
|
|
|
if(isBlankLine)
|
|
{
|
|
if(line_position == 9)
|
|
{
|
|
_crt->output_blank(119 * crt_cycles_multiplier);
|
|
_displayOutputPosition += 119;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// there are then 15 cycles of blank, 80 cycles of pixels, and 24 further cycles of blank
|
|
if(line_position == 9)
|
|
{
|
|
_crt->output_blank(15 * crt_cycles_multiplier);
|
|
_displayOutputPosition += 15;
|
|
|
|
switch(_screenMode)
|
|
{
|
|
case 0: case 3: _currentOutputDivider = 1; break;
|
|
case 1: case 4: case 6: _currentOutputDivider = 2; break;
|
|
case 2: case 5: _currentOutputDivider = 4; break;
|
|
}
|
|
|
|
_crt->allocate_write_area(80 * crt_cycles_multiplier / _currentOutputDivider);
|
|
_currentLine = _writePointer = (uint8_t *)_crt->get_write_target_for_buffer(0);
|
|
|
|
if(current_line == first_graphics_line)
|
|
_startLineAddress = _startScreenAddress;
|
|
_currentScreenAddress = _startLineAddress;
|
|
}
|
|
|
|
if(line_position >= 24 && line_position < 104)
|
|
{
|
|
// determine whether the pixel clock divider has changed; if so write out the old
|
|
// data and start a new run
|
|
unsigned int newDivider = 0;
|
|
switch(_screenMode)
|
|
{
|
|
case 0: case 3: newDivider = 1; break;
|
|
case 1: case 4: case 6: newDivider = 2; break;
|
|
case 2: case 5: newDivider = 4; break;
|
|
}
|
|
if(newDivider != _currentOutputDivider)
|
|
{
|
|
_crt->output_data((unsigned int)((_writePointer - _currentLine) * _currentOutputDivider * crt_cycles_multiplier), _currentOutputDivider);
|
|
_currentOutputDivider = newDivider;
|
|
_crt->allocate_write_area((int)((104 - (unsigned int)line_position) * crt_cycles_multiplier / _currentOutputDivider));
|
|
_currentLine = _writePointer = (uint8_t *)_crt->get_write_target_for_buffer(0);
|
|
}
|
|
|
|
|
|
int pixels_to_output = std::min(_frameCycles - _displayOutputPosition, 104 - line_position);
|
|
_displayOutputPosition += pixels_to_output;
|
|
if(_screenMode >= 4)
|
|
{
|
|
// just shifting wouldn't be enough if both
|
|
if(_displayOutputPosition&1) pixels_to_output++;
|
|
pixels_to_output >>= 1;
|
|
}
|
|
|
|
#define GetNextPixels() \
|
|
if(_currentScreenAddress&32768)\
|
|
{\
|
|
_currentScreenAddress = _screenModeBaseAddress + (_currentScreenAddress&32767);\
|
|
}\
|
|
uint8_t pixels = _ram[_currentScreenAddress];\
|
|
_currentScreenAddress = _currentScreenAddress+8
|
|
|
|
if(pixels_to_output)
|
|
{
|
|
switch(_screenMode)
|
|
{
|
|
default:
|
|
case 0: case 3: case 4: case 6:
|
|
while(pixels_to_output--)
|
|
{
|
|
GetNextPixels();
|
|
|
|
_writePointer[0] = _palette[(pixels&0x80) >> 4];
|
|
_writePointer[1] = _palette[(pixels&0x40) >> 3];
|
|
_writePointer[2] = _palette[(pixels&0x20) >> 2];
|
|
_writePointer[3] = _palette[(pixels&0x10) >> 1];
|
|
_writePointer[4] = _palette[(pixels&0x08) >> 0];
|
|
_writePointer[5] = _palette[(pixels&0x04) << 1];
|
|
_writePointer[6] = _palette[(pixels&0x02) << 2];
|
|
_writePointer[7] = _palette[(pixels&0x01) << 3];
|
|
|
|
_writePointer += 8;
|
|
}
|
|
break;
|
|
|
|
case 1:
|
|
case 5:
|
|
while(pixels_to_output--)
|
|
{
|
|
GetNextPixels();
|
|
|
|
_writePointer[0] = _palette[((pixels&0x80) >> 4) | ((pixels&0x08) >> 2)];
|
|
_writePointer[1] = _palette[((pixels&0x40) >> 3) | ((pixels&0x04) >> 1)];
|
|
_writePointer[2] = _palette[((pixels&0x20) >> 2) | ((pixels&0x02) >> 0)];
|
|
_writePointer[3] = _palette[((pixels&0x10) >> 1) | ((pixels&0x01) << 1)];
|
|
|
|
_writePointer += 4;
|
|
}
|
|
break;
|
|
|
|
case 2:
|
|
while(pixels_to_output--)
|
|
{
|
|
GetNextPixels();
|
|
_writePointer[0] = _palette[((pixels&0x80) >> 4) | ((pixels&0x20) >> 3) | ((pixels&0x08) >> 2) | ((pixels&0x02) >> 1)];
|
|
_writePointer[1] = _palette[((pixels&0x40) >> 3) | ((pixels&0x10) >> 2) | ((pixels&0x04) >> 1) | ((pixels&0x01) >> 0)];
|
|
_writePointer += 2;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if(line_position == 104)
|
|
{
|
|
_currentOutputLine++;
|
|
if(!(_currentOutputLine&7))
|
|
{
|
|
_startLineAddress += ((_screenMode < 4) ? 80 : 40)*8 - 7;
|
|
}
|
|
else
|
|
_startLineAddress++;
|
|
|
|
_crt->output_data((unsigned int)((_writePointer - _currentLine) * _currentOutputDivider), _currentOutputDivider);
|
|
_crt->output_blank(24 * crt_cycles_multiplier);
|
|
_displayOutputPosition += 24;
|
|
_currentLine = nullptr;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
const char *Machine::get_signal_decoder()
|
|
{
|
|
return
|
|
"vec4 sample(vec2 coordinate)\n"
|
|
"{\n"
|
|
"float texValue = texture(texID, coordinate).r;\n"
|
|
"return vec4( step(4.0/256.0, mod(texValue, 8.0/256.0)), step(2.0/256.0, mod(texValue, 4.0/256.0)), step(1.0/256.0, mod(texValue, 2.0/256.0)), 1.0);\n"
|
|
"}";
|
|
}
|
|
|
|
void Machine::set_key_state(Key key, bool isPressed)
|
|
{
|
|
if(key == KeyBreak)
|
|
{
|
|
set_reset_line(isPressed);
|
|
}
|
|
else
|
|
{
|
|
if(isPressed)
|
|
_keyStates[key >> 4] |= key&0xf;
|
|
else
|
|
_keyStates[key >> 4] &= ~(key&0xf);
|
|
}
|
|
}
|
|
|
|
void Machine::Speaker::get_samples(unsigned int number_of_samples, int16_t *target)
|
|
{
|
|
if(!_is_enabled)
|
|
{
|
|
*target = 0;
|
|
}
|
|
else
|
|
{
|
|
*target = _output_level;
|
|
// fwrite(target, sizeof(int16_t), 1, rawStream);
|
|
}
|
|
skip_samples(number_of_samples);
|
|
}
|
|
|
|
void Machine::Speaker::skip_samples(unsigned int number_of_samples)
|
|
{
|
|
while(number_of_samples--)
|
|
{
|
|
_counter ++;
|
|
if(_counter > _divider)
|
|
{
|
|
_counter = 0;
|
|
_output_level ^= 8192;
|
|
}
|
|
}
|
|
}
|
|
|
|
void Machine::Speaker::set_divider(uint8_t divider)
|
|
{
|
|
_divider = divider;
|
|
}
|
|
|
|
void Machine::Speaker::set_is_enabled(bool is_enabled)
|
|
{
|
|
_is_enabled = is_enabled;
|
|
_counter = 0;
|
|
}
|
|
|
|
Machine::Speaker::Speaker() : _counter(0), _divider(0x32), _is_enabled(false), _output_level(0)
|
|
{
|
|
// rawStream = fopen("/Users/thomasharte/Desktop/sound.rom", "wb");
|
|
}
|
|
|
|
Machine::Speaker::~Speaker()
|
|
{
|
|
// fclose(rawStream);
|
|
}
|