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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
dac.c
DAC device emulator.
***************************************************************************/
#include "emu.h"
#include "dac.h"
// device type definition
const device_type DAC = &device_creator<dac_device>;
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// dac_device - constructor
//-------------------------------------------------
dac_device::dac_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
: device_t(mconfig, DAC, "DAC", tag, owner, clock, "dac", __FILE__),
device_sound_interface(mconfig, *this),
m_stream(NULL),
m_output(0)
{
}
//-------------------------------------------------
// write_unsigned8 - write an 8-bit value,
// keeping the scaled result unsigned
//-------------------------------------------------
WRITE8_MEMBER( dac_device::write_unsigned8 )
{
write_unsigned8(data);
}
//-------------------------------------------------
// write_signed8 - write an 8-bit value,
// keeping the scaled result signed
//-------------------------------------------------
WRITE8_MEMBER( dac_device::write_signed8 )
{
write_signed8(data);
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void dac_device::device_start()
{
// create the stream
m_stream = stream_alloc(0, 1, DEFAULT_SAMPLE_RATE);
// register for save states
save_item(NAME(m_output));
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void dac_device::device_reset()
{
m_output = 0;
}
//-------------------------------------------------
// sound_stream_update - handle update requests
// for our sound stream
//-------------------------------------------------
void dac_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples)
{
// just fill with current value
for (int samp = 0; samp < samples; samp++)
outputs[0][samp] = m_output;
}
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