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path: root/src/devices/bus/bbc/userport/beebspch.cpp
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// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
/**********************************************************************

    Beeb Speech Synthesiser - Watford Electronics

    TODO:
    - verify clock and low/high intonation
    - add reset button

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


#include "emu.h"
#include "beebspch.h"
#include "speaker.h"


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

DEFINE_DEVICE_TYPE(BBC_BEEBSPCH, bbc_beebspch_device, "bbc_beebspch", "Beeb Speech Synthesiser")

ROM_START(beebspch)
	ROM_REGION(0x4000, "exp_rom", 0)
	ROM_LOAD("watford_speech.rom", 0x0000, 0x2000, CRC(731642a8) SHA1(1bd31345af6043f394bc9d8e65180c93b2356905))
	ROM_RELOAD(0x2000, 0x2000)

	ROM_REGION(0x10000, "sp0256", 0)
	ROM_LOAD("sp0256a-al2.bin", 0x1000, 0x0800, CRC(b504ac15) SHA1(e60fcb5fa16ff3f3b69d36c7a6e955744d3feafc))
ROM_END

//-------------------------------------------------
//  rom_region - device-specific ROM region
//-------------------------------------------------

const tiny_rom_entry *bbc_beebspch_device::device_rom_region() const
{
	return ROM_NAME(beebspch);
}

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

void bbc_beebspch_device::device_add_mconfig(machine_config &config)
{
	SPEAKER(config, "mono").front_center();
	SP0256(config, m_nsp, 3120000); // TODO: generated by a LS269
	m_nsp->data_request_callback().set(FUNC(bbc_beebspch_device::cb1_w));
	m_nsp->standby_callback().set(FUNC(bbc_beebspch_device::cb2_w));
	m_nsp->add_route(ALL_OUTPUTS, "mono", 1.0);
}


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

//-------------------------------------------------
//  bbc_beebspch_device - constructor
//-------------------------------------------------

bbc_beebspch_device::bbc_beebspch_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
	: device_t(mconfig, BBC_BEEBSPCH, tag, owner, clock)
	, device_bbc_userport_interface(mconfig, *this)
	, m_nsp(*this, "sp0256")
{
}


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

void bbc_beebspch_device::device_start()
{
}

//**************************************************************************
//  IMPLEMENTATION
//**************************************************************************

WRITE8_MEMBER(bbc_beebspch_device::pb_w)
{
	switch (data & 0xc0)
	{
	case 0x40:
		// intonation high
		m_nsp->set_clock(3800000); // TODO: the exact frequency is unknown
		break;
	case 0x80:
		// intonation low
		m_nsp->set_clock(3500000); // CK / 4 ??
		break;
	}

	// allophone
	m_nsp->ald_w(data & 0x3f);
}

WRITE_LINE_MEMBER(bbc_beebspch_device::cb1_w)
{
	m_slot->cb1_w(state);
}

WRITE_LINE_MEMBER(bbc_beebspch_device::cb2_w)
{
	m_slot->cb2_w(state);
}