// license:BSD-3-Clause // copyright-holders:Nigel Barnes /********************************************************************** Intelligent Interfaces Dual RS423 Serial Interface TODO: - everything, this is skeleton with ROM. **********************************************************************/ #include "emu.h" #include "rs423.h" #include "machine/6522via.h" #include "machine/mc68681.h" #include "bus/rs232/rs232.h" namespace { // ======================> arc_rs423_device class arc_rs423_device : public device_t, public device_archimedes_podule_interface { public: // construction/destruction arc_rs423_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock); protected: // device-level overrides virtual void device_start() override; virtual void device_reset() override; // optional information overrides virtual void device_add_mconfig(machine_config &config) override; virtual const tiny_rom_entry *device_rom_region() const override; // device_archimedes_podule_interface overrides virtual void ioc_map(address_map &map) override; private: required_memory_region m_podule_rom; u8 m_rom_page; }; void arc_rs423_device::ioc_map(address_map &map) { map(0x0000, 0x1fff).lr8(NAME([this](offs_t offset) { return m_podule_rom->base()[offset | ((m_rom_page << 11) & 0x7800)]; })).umask32(0x000000ff); //map(0x2000, 0x203f).rw("via", FUNC(via6522_device::read), FUNC(via6522_device::write)).umask32(0x000000ff); //map(0x3000, 0x303f).rw("duart", FUNC(scn2681_device::read), FUNC(scn2681_device::write)).umask32(0x000000ff); } //------------------------------------------------- // ROM( rs423 ) //------------------------------------------------- ROM_START( rs423 ) ROM_REGION(0x8000, "podule_rom", 0) ROM_LOAD("iidual_id.rom", 0x0000, 0x8000, CRC(ae113882) SHA1(eb97839cd66dce33598aed90ac2f0624de1aa60d)) ROM_END const tiny_rom_entry *arc_rs423_device::device_rom_region() const { return ROM_NAME( rs423 ); } //------------------------------------------------- // device_add_mconfig - add device configuration //------------------------------------------------- void arc_rs423_device::device_add_mconfig(machine_config &config) { via6522_device &via(R65C22(config, "via", DERIVED_CLOCK(1, 4))); via.writepa_handler().set([this](u8 data) { m_rom_page = data; }); via.irq_handler().set([this](int state) { set_pirq(state); }); scn2681_device &duart(SCN2681(config, "duart", 3.6864_MHz_XTAL)); // SC26C92 duart.a_tx_cb().set("rs232a", FUNC(rs232_port_device::write_txd)); duart.b_tx_cb().set("rs232b", FUNC(rs232_port_device::write_txd)); rs232_port_device &rs232a(RS232_PORT(config, "rs232a", default_rs232_devices, nullptr)); rs232a.rxd_handler().set("duart", FUNC(scn2681_device::rx_a_w)); rs232_port_device &rs232b(RS232_PORT(config, "rs232b", default_rs232_devices, nullptr)); rs232b.rxd_handler().set("duart", FUNC(scn2681_device::rx_b_w)); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // arc_rs423_device - constructor //------------------------------------------------- arc_rs423_device::arc_rs423_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) : device_t(mconfig, ARC_RS423, tag, owner, clock) , device_archimedes_podule_interface(mconfig, *this) , m_podule_rom(*this, "podule_rom") , m_rom_page(0) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void arc_rs423_device::device_start() { save_item(NAME(m_rom_page)); } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void arc_rs423_device::device_reset() { m_rom_page = 0x00; } } // anonymous namespace //************************************************************************** // DEVICE DEFINITIONS //************************************************************************** DEFINE_DEVICE_TYPE_PRIVATE(ARC_RS423, device_archimedes_podule_interface, arc_rs423_device, "arc_rs423", "Archimedes Dual RS423 Serial Interface")