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◆ main openmsx / src / SVIPrinterPort.cc
2.4 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
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#include "SVIPrinterPort.hh"
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#include "DummyPrinterPortDevice.hh"
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#include "serialize.hh"
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#include "checked_cast.hh"
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#include "unreachable.hh"
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#include <memory>
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// Centronics interface
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//
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// DAT0-DAT7   Printer data write port, output (10H)
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// /STB        Printer strobe port,     output (11H)
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// BUSY        Printer status port,     input  (12H)
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namespace openmsx {
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SVIPrinterPort::SVIPrinterPort(const DeviceConfig& config)
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	: MSXDevice(config)
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	, Connector(MSXDevice::getPluggingController(), "printerport",
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	            std::make_unique<DummyPrinterPortDevice>())
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{
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	reset(getCurrentTime());
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}
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void SVIPrinterPort::reset(EmuTime time)
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{
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	writeData(0, time);    // TODO check this
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	setStrobe(true, time); // TODO check this
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}
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uint8_t SVIPrinterPort::readIO(uint16_t port, EmuTime time)
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{
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	return peekIO(port, time);
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}
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uint8_t SVIPrinterPort::peekIO(uint16_t /*port*/, EmuTime time) const
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{
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	// bit 1 = status / other bits always 1
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	return getPluggedPrintDev().getStatus(time) ? 0xFF : 0xFE;
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}
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void SVIPrinterPort::writeIO(uint16_t port, uint8_t value, EmuTime time)
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{
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	switch (port & 0x01) {
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	case 0:
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		writeData(value, time);
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		break;
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	case 1:
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		setStrobe(value & 1, time); // bit 0 = strobe
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		break;
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	default:
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		UNREACHABLE;
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	}
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}
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void SVIPrinterPort::setStrobe(bool newStrobe, EmuTime time)
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{
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	if (newStrobe != strobe) {
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		strobe = newStrobe;
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		getPluggedPrintDev().setStrobe(strobe, time);
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	}
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}
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void SVIPrinterPort::writeData(uint8_t newData, EmuTime time)
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{
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	if (newData != data) {
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		data = newData;
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		getPluggedPrintDev().writeData(data, time);
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	}
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}
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zstring_view SVIPrinterPort::getDescription() const
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{
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	return "Spectravideo SVI-328 Printer port";
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}
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zstring_view SVIPrinterPort::getClass() const
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{
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	return "Printer Port";
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}
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void SVIPrinterPort::plug(Pluggable& dev, EmuTime time)
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{
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	Connector::plug(dev, time);
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	getPluggedPrintDev().writeData(data, time);
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	getPluggedPrintDev().setStrobe(strobe, time);
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}
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PrinterPortDevice& SVIPrinterPort::getPluggedPrintDev() const
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{
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	return *checked_cast<PrinterPortDevice*>(&getPlugged());
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}
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template<typename Archive>
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void SVIPrinterPort::serialize(Archive& ar, unsigned /*version*/)
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{
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	ar.template serializeBase<MSXDevice>(*this);
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	ar.template serializeBase<Connector>(*this);
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	ar.serialize("strobe", strobe,
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	             "data",   data);
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	// TODO force writing data to port??
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}
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INSTANTIATE_SERIALIZE_METHODS(SVIPrinterPort);
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REGISTER_MSXDEVICE(SVIPrinterPort, "SVI-328 PrinterPort");
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} // namespace openmsx