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yamaha/ymdx9.cpp: Resolved issues with incoming MIDI. (#10702)

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* Added divider on 500 kHz midi serial clock.
* Added missing MIDI data read handler.
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Anthony 2022-12-20 05:22:31 +11:00 committed by GitHub
parent dbb71a0180
commit 21f7f35c19
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1 changed files with 19 additions and 1 deletions
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20
src/mame/yamaha/ymdx9.cpp
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@ -159,6 +159,14 @@ private:
* @return uint8_t The value read from the port. * @return uint8_t The value read from the port.
*/ */
uint8_t p1_r(offs_t offset); uint8_t p1_r(offs_t offset);
/**
* @brief Handle a read from the synth's IO Port 2.
* This function is used to handle incoming serial data.
* @param offset The offset into the memory mapped region being read.
* @return uint8_t The value read from the port.
*/
uint8_t p2_r(offs_t offset);
}; };
@ -242,6 +250,7 @@ void yamaha_dx9_state::dx9(machine_config &config)
// Unlike the DX7 only IO port 1 is used. // Unlike the DX7 only IO port 1 is used.
// The direction flags of other ports are set, however they are never read, or written. // The direction flags of other ports are set, however they are never read, or written.
m_maincpu->in_p1_cb().set(FUNC(yamaha_dx9_state::p1_r)); m_maincpu->in_p1_cb().set(FUNC(yamaha_dx9_state::p1_r));
m_maincpu->in_p2_cb().set(FUNC(yamaha_dx9_state::p2_r));
m_maincpu->out_p1_cb().set(FUNC(yamaha_dx9_state::p1_w)); m_maincpu->out_p1_cb().set(FUNC(yamaha_dx9_state::p1_w));
NVRAM(config, "ram1", nvram_device::DEFAULT_ALL_0); NVRAM(config, "ram1", nvram_device::DEFAULT_ALL_0);
@ -255,7 +264,7 @@ void yamaha_dx9_state::dx9(machine_config &config)
m_adc->in_callback<4>().set_constant(0x80); m_adc->in_callback<4>().set_constant(0x80);
// Configure MIDI. // Configure MIDI.
auto &midiclock(CLOCK(config, "midiclock", 500_kHz_XTAL)); auto &midiclock(CLOCK(config, "midiclock", 500_kHz_XTAL / 2));
midiclock.signal_handler().set(FUNC(yamaha_dx9_state::midiclock_w)); midiclock.signal_handler().set(FUNC(yamaha_dx9_state::midiclock_w));
MIDI_PORT(config, "mdin", midiin_slot, "midiin").rxd_handler().set(FUNC(yamaha_dx9_state::midi_r)); MIDI_PORT(config, "mdin", midiin_slot, "midiin").rxd_handler().set(FUNC(yamaha_dx9_state::midi_r));
@ -323,7 +332,16 @@ uint8_t yamaha_dx9_state::p1_r(offs_t offset)
return m_adc->eoc_r() << 4; return m_adc->eoc_r() << 4;
} }
/**
* yamaha_dx9_state::p2_r
*/
uint8_t yamaha_dx9_state::p2_r(offs_t offset)
{
return m_rx_data << 3;
}
/** /**
* yamaha_dx9_state::p1_w * yamaha_dx9_state::p1_w
*/ */