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/**********************************************************************
Sequential Circuits MIDI Interface cartridge emulation
Copyright MESS Team.
Visit http://mamedev.org for licensing and usage restrictions.
**********************************************************************/
#include "c64_midi_sci.h"
//**************************************************************************
// MACROS/CONSTANTS
//**************************************************************************
#define MC6850_TAG "mc6850"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
const device_type C64_MIDI_SCI = &device_creator<c64_sequential_midi_cartridge_device>;
//-------------------------------------------------
// 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;
}
}
}
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