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// license:BSD-3-Clause
// copyright-holders:Olivier Galibert,Aaron Giles
/*********************************************************/
/* ricoh RF5C68(or clone) PCM controller */
/*********************************************************/
#include "emu.h"
#include "rf5c68.h"
// device type definition
const device_type RF5C68 = &device_creator<rf5c68_device>;
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// rf5c68_device - constructor
//-------------------------------------------------
rf5c68_device::rf5c68_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
: device_t(mconfig, RF5C68, "RF5C68", tag, owner, clock, "rf5c68", __FILE__),
device_sound_interface(mconfig, *this),
m_stream(NULL),
m_cbank(0),
m_wbank(0),
m_enable(0)
{
memset(m_data, 0, sizeof(UINT8)*0x10000);
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void rf5c68_device::device_start()
{
m_sample_end_cb.bind_relative_to(*owner());
/* allocate memory for the chip */
memset(m_data, 0xff, sizeof(m_data));
/* allocate the stream */
m_stream = stream_alloc(0, 2, clock() / 384);
}
//-------------------------------------------------
// sound_stream_update - handle a stream update
//-------------------------------------------------
void rf5c68_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples)
{
stream_sample_t *left = outputs[0];
stream_sample_t *right = outputs[1];
int i, j;
/* start with clean buffers */
memset(left, 0, samples * sizeof(*left));
memset(right, 0, samples * sizeof(*right));
/* bail if not enabled */
if (!m_enable)
return;
/* loop over channels */
for (i = 0; i < RF5C68_NUM_CHANNELS; i++)
{
rf5c68_pcm_channel *chan = &m_chan[i];
/* if this channel is active, accumulate samples */
if (chan->enable)
{
int lv = (chan->pan & 0x0f) * chan->env;
int rv = ((chan->pan >> 4) & 0x0f) * chan->env;
/* loop over the sample buffer */
for (j = 0; j < samples; j++)
{
int sample;
/* trigger sample callback */
if(!m_sample_end_cb.isnull())
{
if(((chan->addr >> 11) & 0xfff) == 0xfff)
m_sample_end_cb((chan->addr >> 11)/0x2000);
}
/* fetch the sample and handle looping */
sample = m_data[(chan->addr >> 11) & 0xffff];
if (sample == 0xff)
{
chan->addr = chan->loopst << 11;
sample = m_data[(chan->addr >> 11) & 0xffff];
/* if we loop to a loop point, we're effectively dead */
if (sample == 0xff)
break;
}
chan->addr += chan->step;
/* add to the buffer */
if (sample & 0x80)
{
sample &= 0x7f;
left[j] += (sample * lv) >> 5;
right[j] += (sample * rv) >> 5;
}
else
{
left[j] -= (sample * lv) >> 5;
right[j] -= (sample * rv) >> 5;
}
}
}
}
/* now clamp and shift the result (output is only 10 bits) */
for (j = 0; j < samples; j++)
{
stream_sample_t temp;
temp = left[j];
if (temp > 32767) temp = 32767;
else if (temp < -32768) temp = -32768;
left[j] = temp & ~0x3f;
temp = right[j];
if (temp > 32767) temp = 32767;
else if (temp < -32768) temp = -32768;
right[j] = temp & ~0x3f;
}
}
//-------------------------------------------------
// RF5C68 write register
//-------------------------------------------------
READ8_MEMBER( rf5c68_device::rf5c68_r )
{
UINT8 shift;
m_stream->update();
shift = (offset & 1) ? 11 + 8 : 11;
// printf("%08x\n",(m_chan[(offset & 0x0e) >> 1].addr));
return (m_chan[(offset & 0x0e) >> 1].addr) >> (shift);
}
WRITE8_MEMBER( rf5c68_device::rf5c68_w )
{
rf5c68_pcm_channel *chan = &m_chan[m_cbank];
int i;
/* force the stream to update first */
m_stream->update();
/* switch off the address */
switch (offset)
{
case 0x00: /* envelope */
chan->env = data;
break;
case 0x01: /* pan */
chan->pan = data;
break;
case 0x02: /* FDL */
chan->step = (chan->step & 0xff00) | (data & 0x00ff);
break;
case 0x03: /* FDH */
chan->step = (chan->step & 0x00ff) | ((data << 8) & 0xff00);
break;
case 0x04: /* LSL */
chan->loopst = (chan->loopst & 0xff00) | (data & 0x00ff);
break;
case 0x05: /* LSH */
chan->loopst = (chan->loopst & 0x00ff) | ((data << 8) & 0xff00);
break;
case 0x06: /* ST */
chan->start = data;
if (!chan->enable)
chan->addr = chan->start << (8 + 11);
break;
case 0x07: /* control reg */
m_enable = (data >> 7) & 1;
if (data & 0x40)
m_cbank = data & 7;
else
m_wbank = data & 15;
break;
case 0x08: /* channel on/off reg */
for (i = 0; i < 8; i++)
{
m_chan[i].enable = (~data >> i) & 1;
if (!m_chan[i].enable)
m_chan[i].addr = m_chan[i].start << (8 + 11);
}
break;
}
}
//-------------------------------------------------
// RF5C68 read memory
//-------------------------------------------------
READ8_MEMBER( rf5c68_device::rf5c68_mem_r )
{
return m_data[m_wbank * 0x1000 + offset];
}
//-------------------------------------------------
// RF5C68 write memory
//-------------------------------------------------
WRITE8_MEMBER( rf5c68_device::rf5c68_mem_w )
{
m_data[m_wbank * 0x1000 + offset] = data;
}
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