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-rw-r--r--src/emu/bus/nes_ctrl/miracle.c178
1 files changed, 178 insertions, 0 deletions
diff --git a/src/emu/bus/nes_ctrl/miracle.c b/src/emu/bus/nes_ctrl/miracle.c
new file mode 100644
index 00000000000..82ce2cc3796
--- /dev/null
+++ b/src/emu/bus/nes_ctrl/miracle.c
@@ -0,0 +1,178 @@
+/**********************************************************************
+
+ Nintendo Entertainment System - Miracle Piano Keyboard
+
+ TODO: basically everything, this is just a skeleton with no
+ real MIDI handling at the moment.
+
+ Copyright MESS Team.
+ Visit http://mamedev.org for licensing and usage restrictions.
+
+**********************************************************************/
+
+#include "miracle.h"
+#include "bus/midi/midi.h"
+
+#define MIRACLE_MIDI_WAITING 0
+#define MIRACLE_MIDI_RECEIVE 1
+#define MIRACLE_MIDI_SEND 2
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type NES_MIRACLE = &device_creator<nes_miracle_device>;
+
+
+MACHINE_CONFIG_FRAGMENT( nes_miracle )
+// MCFG_CPU_ADD("piano_cpu", I8051, XTAL_11_0592MHz) // xtal to be verified
+
+ MCFG_MIDI_PORT_ADD("mdin", midiin_slot, "midiin")
+ MCFG_MIDI_PORT_ADD("mdout", midiout_slot, "midiout")
+MACHINE_CONFIG_END
+
+machine_config_constructor nes_miracle_device::device_mconfig_additions() const
+{
+ return MACHINE_CONFIG_NAME( nes_miracle );
+}
+
+
+//-------------------------------------------------
+// device_timer - handler timer events
+//-------------------------------------------------
+
+void nes_miracle_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
+{
+ if (id == TIMER_STROBE_ON)
+ {
+ m_strobe_clock++;
+ }
+}
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// nes_miracle_device - constructor
+//-------------------------------------------------
+
+nes_miracle_device::nes_miracle_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+ device_t(mconfig, NES_MIRACLE, "Miracle Piano Controller", tag, owner, clock, "nes_miracle", __FILE__)
+ , device_nes_control_port_interface(mconfig, *this)
+// , m_cpu(*this, "piano_cpu")
+{
+}
+
+
+//-------------------------------------------------
+// device_start
+//-------------------------------------------------
+
+void nes_miracle_device::device_start()
+{
+ strobe_timer = timer_alloc(TIMER_STROBE_ON);
+ strobe_timer->adjust(attotime::never);
+ save_item(NAME(m_strobe_on));
+ save_item(NAME(m_sent_bits));
+ save_item(NAME(m_strobe_clock));
+ save_item(NAME(m_midi_mode));
+}
+
+
+//-------------------------------------------------
+// device_reset
+//-------------------------------------------------
+
+void nes_miracle_device::device_reset()
+{
+ m_strobe_on = 0;
+ m_sent_bits = 0;
+ m_strobe_clock = 0;
+ m_midi_mode = MIRACLE_MIDI_WAITING;
+}
+
+
+//-------------------------------------------------
+// read
+//-------------------------------------------------
+
+// TODO: here, reads from serial midi in bit0, when in MIDI_SEND mode
+
+UINT8 nes_miracle_device::read_bit0()
+{
+ UINT8 ret = 0;
+ if (m_strobe_clock >= 66)
+ {
+ // more than 66 clocks since strobe on write means send mode
+ m_midi_mode = MIRACLE_MIDI_SEND;
+ strobe_timer->reset();
+ m_strobe_on = 0;
+ m_strobe_clock = 0;
+// printf("send start\n");
+ }
+
+ if (m_midi_mode == MIRACLE_MIDI_SEND)
+ {
+ //NES reads from Miracle Piano!
+ // ret |= ...
+ }
+
+ return ret;
+}
+
+//-------------------------------------------------
+// write
+//-------------------------------------------------
+
+// TODO: here, writes to serial midi in bit0, when in MIDI_RECEIVE mode
+
+void nes_miracle_device::write(UINT8 data)
+{
+ if (data == 1 && !m_strobe_on)
+ {
+ strobe_timer->adjust(attotime::zero, 0, machine().device<cpu_device>("maincpu")->cycles_to_attotime(1));
+ m_strobe_on = 1;
+ return;
+ }
+
+ if (m_strobe_on)
+ {
+ // was timer running?
+ if (m_strobe_clock > 0)
+ {
+ if (m_strobe_clock < 66 && data == 0)
+ {
+ // less than 66 clocks before new write means receive mode
+ m_midi_mode = MIRACLE_MIDI_RECEIVE;
+// printf("receive start\n");
+ strobe_timer->reset();
+ m_strobe_on = 0;
+ m_strobe_clock = 0;
+ return;
+ }
+ }
+
+ if (m_midi_mode == MIRACLE_MIDI_SEND && data == 0)
+ {
+ // strobe off after the end of a byte
+ m_midi_mode = MIRACLE_MIDI_WAITING;
+// printf("send end\n");
+ }
+ }
+
+ if (m_midi_mode == MIRACLE_MIDI_RECEIVE)
+ {
+ //NES writes (data & 1) to Miracle Piano!
+ // 1st write is data present flag (1=data present)
+ // next 8 writes are actual data bits (with ^1)
+ m_sent_bits++;
+ // then we go back to waiting
+ if (m_sent_bits == 9)
+ {
+// printf("receive end\n");
+ m_midi_mode = MIRACLE_MIDI_WAITING;
+ m_sent_bits = 0;
+ }
+ }
+}