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-rw-r--r--src/devices/sound/upd934g.cpp161
1 files changed, 161 insertions, 0 deletions
diff --git a/src/devices/sound/upd934g.cpp b/src/devices/sound/upd934g.cpp
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+++ b/src/devices/sound/upd934g.cpp
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+// license: BSD-3-Clause
+// copyright-holders: Dirk Best
+/***************************************************************************
+
+ NEC μPD934G
+
+ Percussion Generator
+
+ TODO:
+ - Play MUTED and ACCENTED
+ - T1 input
+ - 8 channels?
+
+***************************************************************************/
+
+#include "emu.h"
+#include "upd934g.h"
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+DEFINE_DEVICE_TYPE(UPD934G, upd934g_device, "upd934g", "NEC uPD934G")
+
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// upd934g_device - constructor
+//-------------------------------------------------
+
+upd934g_device::upd934g_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
+ device_t(mconfig, UPD934G, tag, owner, clock),
+ device_sound_interface(mconfig, *this),
+ m_data_cb(*this),
+ m_stream(nullptr),
+ m_sample(0),
+ m_ready(false)
+{
+}
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void upd934g_device::device_start()
+{
+ // create sound stream
+ m_stream = machine().sound().stream_alloc(*this, 0, 4, 20000);
+
+ // resolve callbacks
+ m_data_cb.resolve_safe(0);
+
+ // register for save states
+ save_pointer(NAME(m_addr), 16);
+
+ for (unsigned i = 0; i < 4; i++)
+ {
+ save_item(NAME(m_channel[i].pos), i);
+ save_item(NAME(m_channel[i].playing), i);
+ save_item(NAME(m_channel[i].volume), i);
+ }
+
+ save_item(NAME(m_sample));
+ save_item(NAME(m_ready));
+}
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void upd934g_device::device_reset()
+{
+ m_ready = false;
+
+ for (unsigned i = 0; i < 4; i++)
+ m_channel[i].playing = -1;
+}
+
+//-------------------------------------------------
+// sound_stream_update - handle update requests for
+// our sound stream
+//-------------------------------------------------
+
+void upd934g_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples)
+{
+ for (unsigned ch = 0; ch < 4; ch++)
+ {
+ std::fill(&outputs[ch][0], &outputs[ch][samples], 0);
+
+ if (m_ready && m_channel[ch].playing != -1)
+ {
+ uint16_t end = m_addr[m_channel[ch].playing + 1] - 1;
+
+ for (unsigned i = 0; i < samples; i++)
+ {
+ int8_t raw = static_cast<int8_t>(m_data_cb(m_channel[ch].pos));
+ outputs[ch][i] = raw * (m_channel[ch].volume + 1) * 64;
+
+ if (++m_channel[ch].pos >= end)
+ {
+ m_channel[ch].playing = -1;
+ break;
+ }
+ }
+ }
+ }
+}
+
+
+//**************************************************************************
+// INTERFACE
+//**************************************************************************
+
+WRITE8_MEMBER( upd934g_device::write )
+{
+ switch (offset)
+ {
+ case 0:
+ // format of data written here is:
+ // 76------ command
+ // --5432-- sample number
+ // ------10 volume?
+ m_sample = (data >> 2) & 0x0f;
+ switch (data >> 6)
+ {
+ case 0:
+ logerror("CMD STORE ADDRESS sample %x\n", m_sample);
+ break;
+ case 1:
+ logerror("CMD PLAY sample %x (channel %d)\n", m_sample, m_sample >> 1);
+ if (m_sample < 8)
+ {
+ m_channel[m_sample >> 1].pos = m_addr[m_sample];
+ m_channel[m_sample >> 1].playing = m_sample;
+ m_channel[m_sample >> 1].volume = data & 0x03;
+ }
+ break;
+ case 2:
+ logerror("CMD PLAY MUTED sample %x (channel %d)\n", m_sample, m_sample >> 1);
+ break;
+ case 3:
+ logerror("CMD PLAY ACCENTED sample %x (channel %d)\n", m_sample, m_sample >> 1);
+ break;
+ }
+ break;
+ case 1:
+ m_addr[m_sample] = (m_addr[m_sample] & 0xff00) | (data << 0);
+ break;
+ case 2:
+ m_addr[m_sample] = (m_addr[m_sample] & 0x00ff) | (data << 8);
+ logerror(" sample %x address = %04x\n", m_sample, m_addr[m_sample]);
+ break;
+ case 3:
+ m_ready = true;
+ break;
+ }
+}