summaryrefslogtreecommitdiffstatshomepage
diff options
context:
space:
mode:
author Nigel Barnes <Pernod70@users.noreply.github.com>2020-01-03 14:08:26 +0000
committer Nigel Barnes <Pernod70@users.noreply.github.com>2020-01-07 12:39:16 +0000
commit1564c566c12aa515cca6d5c1a66a2473b351ccd3 (patch)
tree828a0b4373cd6954bec8b9450cfd3651b757ce38
parent5b46a3b8ab50cc3937d91c55009000774aa64ee9 (diff)
bus/centronics: Added a R-2R ladder DAC device.
-rw-r--r--scripts/src/bus.lua2
-rw-r--r--src/devices/bus/centronics/ctronics.cpp2
-rw-r--r--src/devices/bus/centronics/dac_r2r.cpp54
-rw-r--r--src/devices/bus/centronics/dac_r2r.h49
4 files changed, 107 insertions, 0 deletions
diff --git a/scripts/src/bus.lua b/scripts/src/bus.lua
index 1a9fb3d0fd8..2ee84a13754 100644
--- a/scripts/src/bus.lua
+++ b/scripts/src/bus.lua
@@ -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",
diff --git a/src/devices/bus/centronics/ctronics.cpp b/src/devices/bus/centronics/ctronics.cpp
index 1dda2343bc6..c162a23899f 100644
--- a/src/devices/bus/centronics/ctronics.cpp
+++ b/src/devices/bus/centronics/ctronics.cpp
@@ -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);
}
diff --git a/src/devices/bus/centronics/dac_r2r.cpp b/src/devices/bus/centronics/dac_r2r.cpp
new file mode 100644
index 00000000000..17b673a3f3f
--- /dev/null
+++ b/src/devices/bus/centronics/dac_r2r.cpp
@@ -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);
+}
diff --git a/src/devices/bus/centronics/dac_r2r.h b/src/devices/bus/centronics/dac_r2r.h
new file mode 100644
index 00000000000..e6cd7871db1
--- /dev/null
+++ b/src/devices/bus/centronics/dac_r2r.h
@@ -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