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bus/centronics: Added a R-2R ladder DAC device.

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This commit is contained in:
Nigel Barnes 2020-01-03 14:08:26 +00:00
parent 5b46a3b8ab
commit 1564c566c1
4 changed files with 107 additions and 0 deletions
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2
scripts/src/bus.lua
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@ -2386,6 +2386,8 @@ if (BUSES["CENTRONICS"]~=null) then
MAME_DIR .. "src/devices/bus/centronics/comxpl80.h",
MAME_DIR .. "src/devices/bus/centronics/covox.cpp",
MAME_DIR .. "src/devices/bus/centronics/covox.h",
MAME_DIR .. "src/devices/bus/centronics/dac_r2r.cpp",
MAME_DIR .. "src/devices/bus/centronics/dac_r2r.h",
MAME_DIR .. "src/devices/bus/centronics/dsjoy.cpp",
MAME_DIR .. "src/devices/bus/centronics/dsjoy.h",
MAME_DIR .. "src/devices/bus/centronics/epson_ex800.cpp",

2
src/devices/bus/centronics/ctronics.cpp
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@ -134,6 +134,7 @@ device_centronics_peripheral_interface::~device_centronics_peripheral_interface(
#include "printer.h"
#include "covox.h"
#include "chessmec.h"
#include "dac_r2r.h"
void centronics_devices(device_slot_interface &device)
{
@ -147,4 +148,5 @@ void centronics_devices(device_slot_interface &device)
device.option_add("covox", CENTRONICS_COVOX);
device.option_add("covox_stereo", CENTRONICS_COVOX_STEREO);
device.option_add("chessmec", CENTRONICS_CHESSMEC);
device.option_add("dac_r2r", CENTRONICS_DAC_R2R);
}

54
src/devices/bus/centronics/dac_r2r.cpp Normal file
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@ -0,0 +1,54 @@
// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
#include "emu.h"
#include "dac_r2r.h"
#include "sound/volt_reg.h"
#include "speaker.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
DEFINE_DEVICE_TYPE(CENTRONICS_DAC_R2R, centronics_dac_r2r_device, "dac_r2r", "Centronics R-2R DAC (DIY)")
/***************************************************************************
IMPLEMENTATION
***************************************************************************/
//-------------------------------------------------
// centronics_dac_r2r_device - constructor
//-------------------------------------------------
centronics_dac_r2r_device::centronics_dac_r2r_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, CENTRONICS_DAC_R2R, tag, owner, clock)
, device_centronics_peripheral_interface( mconfig, *this )
, m_dac(*this, "dac")
, m_data(0)
{
}
//-------------------------------------------------
// device_add_mconfig - add device configuration
//-------------------------------------------------
void centronics_dac_r2r_device::device_add_mconfig(machine_config &config)
{
/* sound hardware */
SPEAKER(config, "speaker").front_center();
DAC_8BIT_R2R(config, m_dac, 0).add_route(ALL_OUTPUTS, "speaker", 0.5);
voltage_regulator_device &vref(VOLTAGE_REGULATOR(config, "vref"));
vref.add_route(0, "dac", 1.0, DAC_VREF_POS_INPUT);
vref.add_route(0, "dac", -1.0, DAC_VREF_NEG_INPUT);
}
void centronics_dac_r2r_device::device_start()
{
save_item(NAME(m_data));
}
void centronics_dac_r2r_device::update_dac()
{
if (started())
m_dac->write(m_data);
}

49
src/devices/bus/centronics/dac_r2r.h Normal file
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@ -0,0 +1,49 @@
// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
#ifndef MAME_BUS_CENTRONICS_DAC_R2R_H
#define MAME_BUS_CENTRONICS_DAC_R2R_H
#pragma once
#include "ctronics.h"
#include "sound/dac.h"
// ======================> centronics_dac_r2r_device
class centronics_dac_r2r_device : public device_t,
public device_centronics_peripheral_interface
{
public:
// construction/destruction
centronics_dac_r2r_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
protected:
// device-level overrides
virtual void device_start() override;
// optional information overrides
virtual void device_add_mconfig(machine_config &config) override;
virtual DECLARE_WRITE_LINE_MEMBER( input_data0 ) override { if (state) m_data |= 0x01; else m_data &= ~0x01; update_dac(); }
virtual DECLARE_WRITE_LINE_MEMBER( input_data1 ) override { if (state) m_data |= 0x02; else m_data &= ~0x02; update_dac(); }
virtual DECLARE_WRITE_LINE_MEMBER( input_data2 ) override { if (state) m_data |= 0x04; else m_data &= ~0x04; update_dac(); }
virtual DECLARE_WRITE_LINE_MEMBER( input_data3 ) override { if (state) m_data |= 0x08; else m_data &= ~0x08; update_dac(); }
virtual DECLARE_WRITE_LINE_MEMBER( input_data4 ) override { if (state) m_data |= 0x10; else m_data &= ~0x10; update_dac(); }
virtual DECLARE_WRITE_LINE_MEMBER( input_data5 ) override { if (state) m_data |= 0x20; else m_data &= ~0x20; update_dac(); }
virtual DECLARE_WRITE_LINE_MEMBER( input_data6 ) override { if (state) m_data |= 0x40; else m_data &= ~0x40; update_dac(); }
virtual DECLARE_WRITE_LINE_MEMBER( input_data7 ) override { if (state) m_data |= 0x80; else m_data &= ~0x80; update_dac(); }
private:
required_device<dac_byte_interface> m_dac;
void update_dac();
uint8_t m_data;
};
// device type definition
DECLARE_DEVICE_TYPE(CENTRONICS_DAC_R2R, centronics_dac_r2r_device)
#endif // MAME_BUS_CENTRONICS_DAC_R2R_H