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// license:BSD-3-Clause
// copyright-holders: Ken White
/**********************************************************************

    Commodore PET user port dual joystick and sound device emulation

    BEST OF THE PET GAZETTE magazine documents attaching Atari-style joysticks
    with DB-9S connectors to a DB-25P connector plugged into the user port.
    page 42, PET AND THE DUAL JOYSTICKS by Chuck Johnson
    page 47, STANDARD #1 (CB2 Sound)

**********************************************************************/

/*

Connections
----------
    User      Joysticks
    Port      ____
             /    |
    F ----- |   1 | joy 1 up
      > --- | 6   | joy 1 button
    E ----- |   2 | joy 1 down
            | 7   |
    D ----- |   3 | joy 1 left
    A ----- | 8   | ground
    C ----- |   4 | joy 1 right
            | 9   |
            |   5 |
             \____|
              ____
             /    |
    L ----- |   1 | joy 2 up
      > --- | 6   | joy 2 button
    K ----- |   2 | joy 2 down
            | 7   |
    J ----- |   3 | joy 2 left
    N ----- | 8   | ground
    H ----- |   4 | joy 2 right
            | 9   |
            |   5 |
             \____|

    M ----- / audio
    N ----- \ amplifier

*/

#include "emu.h"
#include "2joysnd.h"

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


//**************************************************************************
//  DEVICE DEFINITIONS
//**************************************************************************

DEFINE_DEVICE_TYPE(PET_USERPORT_JOYSTICK_AND_SOUND_DEVICE, pet_userport_joystick_and_sound_device, "2joysnd", "PET Dual Joysticks and Sound")


//-------------------------------------------------
//  INPUT_PORTS( 2joysnd )
//-------------------------------------------------

static INPUT_PORTS_START( 2joysnd )
	PORT_START("JOY")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(1) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, device_pet_user_port_interface, output_c)
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(1) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, device_pet_user_port_interface, output_d)
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(1) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, pet_userport_joystick_and_sound_device, write_down1)
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(1) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, pet_userport_joystick_and_sound_device, write_up1)
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(2) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, device_pet_user_port_interface, output_h)
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(2) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, device_pet_user_port_interface, output_j)
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(2) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, pet_userport_joystick_and_sound_device, write_down2)
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(2) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, pet_userport_joystick_and_sound_device, write_up2)

	PORT_START("FIRE")
	PORT_BIT( 0x03, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(1) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, pet_userport_joystick_and_sound_device, write_fire1)
	PORT_BIT( 0x30, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(2) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, pet_userport_joystick_and_sound_device, write_fire2)
INPUT_PORTS_END

//-------------------------------------------------
//  input_ports - device-specific input ports
//-------------------------------------------------

ioport_constructor pet_userport_joystick_and_sound_device::device_input_ports() const
{
	return INPUT_PORTS_NAME( 2joysnd );
}

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

void pet_userport_joystick_and_sound_device::device_add_mconfig(machine_config &config)
{
	SPEAKER(config, "speaker").front_center();
	DAC_1BIT(config, m_dac, 0).add_route(ALL_OUTPUTS, "speaker", 0.99);
	voltage_regulator_device &vref(VOLTAGE_REGULATOR(config, "vref"));
	vref.add_route(0, "dac", 1.0, DAC_VREF_POS_INPUT);
}

//**************************************************************************
//  LIVE DEVICE
//**************************************************************************

//-------------------------------------------------
//  pet_user_port_dual_joystick_and_sound_device - constructor
//-------------------------------------------------

pet_userport_joystick_and_sound_device::pet_userport_joystick_and_sound_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
	device_t(mconfig, PET_USERPORT_JOYSTICK_AND_SOUND_DEVICE, tag, owner, clock),
	device_pet_user_port_interface(mconfig, *this),
	m_dac(*this, "dac"),
	m_up1(1),
	m_down1(1),
	m_fire1(1),
	m_up2(1),
	m_down2(1),
	m_fire2(1)

{
}


//-------------------------------------------------
//  device_start - device-specific startup
//-------------------------------------------------

void pet_userport_joystick_and_sound_device::device_start()
{
}


//-------------------------------------------------
//  update_port1
//-------------------------------------------------

void pet_userport_joystick_and_sound_device::update_port1()
{
	output_f(m_up1 && m_fire1);
	output_e(m_down1 && m_fire1);
}


//-------------------------------------------------
//  update_port2
//-------------------------------------------------

void pet_userport_joystick_and_sound_device::update_port2()
{
	output_l(m_up2 && m_fire2);
	output_k(m_down2 && m_fire2);
}


DECLARE_WRITE_LINE_MEMBER( pet_userport_joystick_and_sound_device::input_m )
{
	m_dac->write(state);
}