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Diffstat (limited to 'src/devices/sound/dac.cpp')
-rw-r--r-- | src/devices/sound/dac.cpp | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/src/devices/sound/dac.cpp b/src/devices/sound/dac.cpp new file mode 100644 index 00000000000..8e4baffe3aa --- /dev/null +++ b/src/devices/sound/dac.cpp @@ -0,0 +1,92 @@ +// 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; +} |