summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/bus/centronics/digiblst.cpp
blob: 97a3705417273236181d34c3c8ed7f8ad70c1811 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
// license:BSD-3-Clause
// copyright-holders:Barry Rodewald
/*
 * digiblst.c
 *
 *  Created on: 23/08/2014
 */

#include "emu.h"
#include "digiblst.h"
#include "sound/volt_reg.h"
#include "speaker.h"

//**************************************************************************
//  COVOX DEVICE
//**************************************************************************

// device type definition
DEFINE_DEVICE_TYPE(CENTRONICS_DIGIBLASTER, centronics_digiblaster_device, "digiblst", "Digiblaster (DIY)")


/***************************************************************************
    IMPLEMENTATION
***************************************************************************/
//-------------------------------------------------
//  centronics_covox_device - constructor
//-------------------------------------------------

centronics_digiblaster_device::centronics_digiblaster_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
	: device_t(mconfig, CENTRONICS_DIGIBLASTER, tag, owner, clock),
	device_centronics_peripheral_interface( mconfig, *this ),
	m_dac(*this, "dac"),
	m_data(0)
{
}

//-------------------------------------------------
//  device_add_mconfig - add device configuration
//-------------------------------------------------

void centronics_digiblaster_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); // unknown DAC
	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_digiblaster_device::device_start()
{
	save_item(NAME(m_data));
}

void centronics_digiblaster_device::update_dac()
{
	if (started())
		m_dac->write(m_data);
}