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-rw-r--r--src/devices/bus/archimedes/podule/rs423.cpp136
1 files changed, 136 insertions, 0 deletions
diff --git a/src/devices/bus/archimedes/podule/rs423.cpp b/src/devices/bus/archimedes/podule/rs423.cpp
new file mode 100644
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+++ b/src/devices/bus/archimedes/podule/rs423.cpp
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+// 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, u32 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, 0x301f).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, u32 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")