diff options
Diffstat (limited to 'src/mess/machine/c64/midi_passport.c')
-rw-r--r-- | src/mess/machine/c64/midi_passport.c | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/src/mess/machine/c64/midi_passport.c b/src/mess/machine/c64/midi_passport.c new file mode 100644 index 00000000000..a3074c1ae20 --- /dev/null +++ b/src/mess/machine/c64/midi_passport.c @@ -0,0 +1,255 @@ +/********************************************************************** + + Passport/Syntech MIDI Interface cartridge emulation + + Copyright MESS Team. + Visit http://mamedev.org for licensing and usage restrictions. + +**********************************************************************/ + +#include "midi_passport.h" + + + +//************************************************************************** +// MACROS/CONSTANTS +//************************************************************************** + +#define MC6840_TAG "mc6840" +#define MC6850_TAG "mc6850" + + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +const device_type C64_MIDI_PASSPORT = &device_creator<c64_passport_midi_cartridge_device>; + + +//------------------------------------------------- +// ptm6840_interface ptm_intf +//------------------------------------------------- + +WRITE_LINE_MEMBER( c64_passport_midi_cartridge_device::ptm_irq_w ) +{ + m_ptm_irq = state; + + m_slot->irq_w(m_ptm_irq || m_acia_irq); +} + +static const ptm6840_interface ptm_intf = +{ + 1021800.0f, + { 1021800.0f, 1021800.0f, 1021800.0f }, + { DEVCB_NULL, DEVCB_NULL, DEVCB_NULL }, + DEVCB_DEVICE_LINE_MEMBER(DEVICE_SELF_OWNER, c64_passport_midi_cartridge_device, ptm_irq_w) +}; + + +//------------------------------------------------- +// ACIA6850_INTERFACE( acia_intf ) +//------------------------------------------------- + +WRITE_LINE_MEMBER( c64_passport_midi_cartridge_device::acia_irq_w ) +{ + m_acia_irq = state; + + m_slot->irq_w(m_ptm_irq || m_acia_irq); +} + +READ_LINE_MEMBER( c64_passport_midi_cartridge_device::rx_in ) +{ + return m_rx_state; +} + +WRITE_LINE_MEMBER( c64_passport_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_passport_midi_cartridge_device, rx_in), + DEVCB_DEVICE_LINE_MEMBER(DEVICE_SELF_OWNER, c64_passport_midi_cartridge_device, tx_out), + DEVCB_NULL, + DEVCB_NULL, + DEVCB_NULL, + DEVCB_DEVICE_LINE_MEMBER(DEVICE_SELF_OWNER, c64_passport_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_passport_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_passport_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_passport_midi ) +//------------------------------------------------- + +static MACHINE_CONFIG_FRAGMENT( c64_passport_midi ) + MCFG_ACIA6850_ADD(MC6850_TAG, acia_intf) + MCFG_PTM6840_ADD(MC6840_TAG, ptm_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_passport_midi_cartridge_device::device_mconfig_additions() const +{ + return MACHINE_CONFIG_NAME( c64_passport_midi ); +} + + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// c64_passport_midi_cartridge_device - constructor +//------------------------------------------------- + +c64_passport_midi_cartridge_device::c64_passport_midi_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + device_t(mconfig, C64_MIDI_PASSPORT, "C64 Passport MIDI", tag, owner, clock, "c64_midipp", __FILE__), + device_c64_expansion_card_interface(mconfig, *this), + m_acia(*this, MC6850_TAG), + m_ptm(*this, MC6840_TAG), + m_mdout(*this, "mdout"), + m_ptm_irq(CLEAR_LINE), + m_acia_irq(CLEAR_LINE), + m_rx_state(0) +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void c64_passport_midi_cartridge_device::device_start() +{ + // state saving + save_item(NAME(m_ptm_irq)); + save_item(NAME(m_acia_irq)); + save_item(NAME(m_rx_state)); +} + + +//------------------------------------------------- +// device_reset - device-specific reset +//------------------------------------------------- + +void c64_passport_midi_cartridge_device::device_reset() +{ + m_acia->reset(); + m_ptm->reset(); + + m_rx_state = 0; +} + + +//------------------------------------------------- +// c64_cd_r - cartridge data read +//------------------------------------------------- + +UINT8 c64_passport_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 0: case 1: case 2: case 3: + case 4: case 5: case 6: case 7: + data = m_ptm->read(space, offset & 0x07); + break; + + case 8: + data = m_acia->status_read(space, 0); + break; + + case 9: + data = m_acia->data_read(space, 0); + break; + } + } + + return data; +} + + +//------------------------------------------------- +// c64_cd_w - cartridge data write +//------------------------------------------------- + +void c64_passport_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: case 1: case 2: case 3: + case 4: case 5: case 6: case 7: + m_ptm->write(space, offset & 0x07, data); + break; + + case 8: + m_acia->control_write(space, 0, data); + break; + + case 9: + m_acia->data_write(space, 0, data); + break; + + case 0x30: + // Drum sync SET + break; + + case 0x38: + // Drum sync CLEAR + break; + } + } +} |