// license:BSD-3-Clause
// copyright-holders:Chris Hardy
#include "emu.h"
#include "sound/sn76496.h"
#include "sound/msm5205.h"
#include "includes/trackfld.h"
#include "audio/trackfld.h"
#define TIMER_RATE (4096/4)
DEFINE_DEVICE_TYPE(TRACKFLD_AUDIO, trackfld_audio_device, "trackfld_audio", "Track And Field Audio")
trackfld_audio_device::trackfld_audio_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, TRACKFLD_AUDIO, tag, owner, clock)
, device_sound_interface(mconfig, *this)
, m_audiocpu(*this, finder_base::DUMMY_TAG)
, m_vlm(*this, finder_base::DUMMY_TAG)
, m_last_addr(0)
, m_last_irq(0)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void trackfld_audio_device::device_start()
{
/* sound */
save_item(NAME(m_last_addr));
save_item(NAME(m_last_irq));
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void trackfld_audio_device::device_reset()
{
m_last_addr = 0;
m_last_irq = 0;
}
/* The timer port on TnF and HyperSports sound hardware is derived from
a 14.318 MHz clock crystal which is passed through a couple of 74ls393
ripple counters.
Various outputs of the ripper counters clock the various chips.
The Z80 uses 14.318 MHz / 4 (3.4MHz)
The SN chip uses 14.318 MHz / 8 (1.7MHz)
And the timer is connected to 14.318 MHz / 4096
As we are using the Z80 clockrate as a base value we need to multiply
the no of cycles by 4 to undo the 14.318/4 operation
*/
READ8_MEMBER( trackfld_audio_device::trackfld_sh_timer_r )
{
uint32_t clock = m_audiocpu->total_cycles() / TIMER_RATE;
return clock & 0xF;
}
READ8_MEMBER( trackfld_audio_device::trackfld_speech_r )
{
return m_vlm->bsy() ? 0x10 : 0;
}
WRITE8_MEMBER( trackfld_audio_device::trackfld_sound_w )
{
int changes = offset ^ m_last_addr;
/* A7 = data enable for VLM5030 (don't care ) */
/* A8 = STA pin (1->0 data data , 0->1 start speech */
/* A9 = RST pin 1=reset */
/* A8 VLM5030 ST pin */
if (changes & 0x100)
m_vlm->st(offset & 0x100);
/* A9 VLM5030 RST pin */
if (changes & 0x200)
m_vlm->rst(offset & 0x200);
m_last_addr = offset;
}
READ8_MEMBER( trackfld_audio_device::hyperspt_sh_timer_r )
{
uint32_t clock = m_audiocpu->total_cycles() / TIMER_RATE;
if (m_vlm != nullptr)
return (clock & 0x3) | (m_vlm->bsy() ? 0x04 : 0);
else
return (clock & 0x3);
}
WRITE8_MEMBER( trackfld_audio_device::hyperspt_sound_w )
{
int changes = offset ^ m_last_addr;
/* A3 = data enable for VLM5030 (don't care ) */
/* A4 = STA pin (1->0 data data , 0->1 start speech */
/* A5 = RST pin 1=reset */
/* A6 = VLM5030 output disable (don't care ) */
/* A7 = kONAMI DAC output disable (don't care ) */
/* A8 = SN76489 output disable (don't care ) */
/* A4 VLM5030 ST pin */
if (changes & 0x10)
m_vlm->st(offset & 0x10);
/* A5 VLM5030 RST pin */
if( changes & 0x20 )
m_vlm->rst(offset & 0x20);
m_last_addr = offset;
}
WRITE_LINE_MEMBER(trackfld_audio_device::sh_irqtrigger_w)
{
if (m_last_irq == 0 && state)
{
/* setting bit 0 low then high triggers IRQ on the sound CPU */
m_audiocpu->set_input_line_and_vector(0, HOLD_LINE, 0xff); // Z80
}
m_last_irq = state;
}
//-------------------------------------------------
// sound_stream_update - handle a stream update
//-------------------------------------------------
void trackfld_audio_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples)
{
// should never get here
fatalerror("sound_stream_update called; not applicable to legacy sound devices\n");
}