// license:BSD-3-Clause // copyright-holders:Curt Coder /********************************************************************** Sequential Circuits MIDI Interface cartridge emulation Copyright MESS Team. Visit http://mamedev.org for licensing and usage restrictions. **********************************************************************/ #include "midi_sci.h" //************************************************************************** // MACROS/CONSTANTS //************************************************************************** #define MC6850_TAG "mc6850" //************************************************************************** // DEVICE DEFINITIONS //************************************************************************** const device_type C64_MIDI_SCI = &device_creator; //------------------------------------------------- // ACIA6850_INTERFACE( acia_intf ) //------------------------------------------------- WRITE_LINE_MEMBER( c64_sequential_midi_cartridge_device::acia_irq_w ) { m_slot->irq_w(state); } READ_LINE_MEMBER( c64_sequential_midi_cartridge_device::rx_in ) { return m_rx_state; } WRITE_LINE_MEMBER( c64_sequential_midi_cartridge_device::tx_out ) { m_mdout->tx(state); } static ACIA6850_INTERFACE( acia_intf ) { 500000, 0, // rx clock (we manually clock rx) DEVCB_DEVICE_LINE_MEMBER(DEVICE_SELF_OWNER, c64_sequential_midi_cartridge_device, rx_in), DEVCB_DEVICE_LINE_MEMBER(DEVICE_SELF_OWNER, c64_sequential_midi_cartridge_device, tx_out), DEVCB_NULL, DEVCB_NULL, DEVCB_NULL, DEVCB_DEVICE_LINE_MEMBER(DEVICE_SELF_OWNER, c64_sequential_midi_cartridge_device, acia_irq_w) }; //------------------------------------------------- // SLOT_INTERFACE( midiin_slot ) //------------------------------------------------- static SLOT_INTERFACE_START( midiin_slot ) SLOT_INTERFACE("midiin", MIDIIN_PORT) SLOT_INTERFACE_END WRITE_LINE_MEMBER( c64_sequential_midi_cartridge_device::midi_rx_w ) { m_rx_state = state; for (int i = 0; i < 16; i++) // divider is set to 16 { m_acia->rx_clock_in(); } } static const serial_port_interface midiin_intf = { DEVCB_DEVICE_LINE_MEMBER(DEVICE_SELF_OWNER, c64_sequential_midi_cartridge_device, midi_rx_w) }; //------------------------------------------------- // SLOT_INTERFACE( midiout_slot ) //------------------------------------------------- static SLOT_INTERFACE_START( midiout_slot ) SLOT_INTERFACE("midiout", MIDIOUT_PORT) SLOT_INTERFACE_END static const serial_port_interface midiout_intf = { DEVCB_NULL // midi out ports don't transmit inward }; //------------------------------------------------- // MACHINE_CONFIG_FRAGMENT( c64_sequential_midi ) //------------------------------------------------- static MACHINE_CONFIG_FRAGMENT( c64_sequential_midi ) MCFG_ACIA6850_ADD(MC6850_TAG, acia_intf) MCFG_SERIAL_PORT_ADD("mdin", midiin_intf, midiin_slot, "midiin") MCFG_SERIAL_PORT_ADD("mdout", midiout_intf, midiout_slot, "midiout") MACHINE_CONFIG_END //------------------------------------------------- // machine_config_additions - device-specific // machine configurations //------------------------------------------------- machine_config_constructor c64_sequential_midi_cartridge_device::device_mconfig_additions() const { return MACHINE_CONFIG_NAME( c64_sequential_midi ); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // c64_sequential_midi_cartridge_device - constructor //------------------------------------------------- c64_sequential_midi_cartridge_device::c64_sequential_midi_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : device_t(mconfig, C64_MIDI_SCI, "C64 Sequential Circuits MIDI", tag, owner, clock, "c64_midisci", __FILE__), device_c64_expansion_card_interface(mconfig, *this), m_acia(*this, MC6850_TAG), m_mdout(*this, "mdout"), m_rx_state(0) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void c64_sequential_midi_cartridge_device::device_start() { // state saving save_item(NAME(m_rx_state)); } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void c64_sequential_midi_cartridge_device::device_reset() { m_acia->reset(); m_rx_state = 0; } //------------------------------------------------- // c64_cd_r - cartridge data read //------------------------------------------------- UINT8 c64_sequential_midi_cartridge_device::c64_cd_r(address_space &space, offs_t offset, UINT8 data, int sphi2, int ba, int roml, int romh, int io1, int io2) { if (!io1) { switch (offset & 0xff) { case 2: data = m_acia->status_read(space, 0); break; case 3: data = m_acia->data_read(space, 0); break; } } return data; } //------------------------------------------------- // c64_cd_w - cartridge data write //------------------------------------------------- void c64_sequential_midi_cartridge_device::c64_cd_w(address_space &space, offs_t offset, UINT8 data, int sphi2, int ba, int roml, int romh, int io1, int io2) { if (!io1) { switch (offset & 0xff) { case 0: m_acia->control_write(space, 0, data); break; case 1: m_acia->data_write(space, 0, data); break; } } }