// license:BSD-3-Clause
// copyright-holders:Nicola Salmoria
#include "emu.h"
#include "cpu/z80/z80.h"
#include "includes/lsasquad.h"
/***************************************************************************
main <-> sound CPU communication
***************************************************************************/
TIMER_CALLBACK_MEMBER(lsasquad_state::nmi_callback)
{
if (m_sound_nmi_enable)
m_audiocpu->set_input_line(INPUT_LINE_NMI, PULSE_LINE);
else
m_pending_nmi = 1;
}
WRITE8_MEMBER(lsasquad_state::lsasquad_sh_nmi_disable_w)
{
m_sound_nmi_enable = 0;
}
WRITE8_MEMBER(lsasquad_state::lsasquad_sh_nmi_enable_w)
{
m_sound_nmi_enable = 1;
if (m_pending_nmi)
{
m_audiocpu->set_input_line(INPUT_LINE_NMI, PULSE_LINE);
m_pending_nmi = 0;
}
}
WRITE8_MEMBER(lsasquad_state::lsasquad_sound_command_w)
{
m_sound_pending |= 0x01;
m_sound_cmd = data;
//logerror("%04x: sound cmd %02x\n", space.device().safe_pc(), data);
machine().scheduler().synchronize(timer_expired_delegate(FUNC(lsasquad_state::nmi_callback),this), data);
}
READ8_MEMBER(lsasquad_state::lsasquad_sh_sound_command_r)
{
m_sound_pending &= ~0x01;
//logerror("%04x: read sound cmd %02x\n", space.device().safe_pc(), m_sound_cmd);
return m_sound_cmd;
}
WRITE8_MEMBER(lsasquad_state::lsasquad_sh_result_w)
{
m_sound_pending |= 0x02;
//logerror("%04x: sound res %02x\n", space.device().safe_pc(), data);
m_sound_result = data;
}
READ8_MEMBER(lsasquad_state::lsasquad_sound_result_r)
{
m_sound_pending &= ~0x02;
//logerror("%04x: read sound res %02x\n", space.device().safe_pc(), m_sound_result);
return m_sound_result;
}
READ8_MEMBER(lsasquad_state::lsasquad_sound_status_r)
{
/* bit 0: message pending for sound cpu */
/* bit 1: message pending for main cpu */
return m_sound_pending;
}
READ8_MEMBER(lsasquad_state::daikaiju_sh_sound_command_r)
{
m_sound_pending &= ~0x01;
m_sound_pending |= 0x02;
//logerror("%04x: read sound cmd %02x\n", space.device().safe_pc(), m_sound_cmd);
return m_sound_cmd;
}
READ8_MEMBER(lsasquad_state::daikaiju_sound_status_r)
{
/* bit 0: message pending for sound cpu */
/* bit 1: message pending for main cpu */
return m_sound_pending ^ 3;
}
/***************************************************************************
LSA Squad 68705 protection interface
The following is ENTIRELY GUESSWORK!!!
***************************************************************************/
READ8_MEMBER(lsasquad_state::lsasquad_68705_port_a_r)
{
//logerror("%04x: 68705 port A read %02x\n", space.device().safe_pc(), m_port_a_in);
return (m_port_a_out & m_ddr_a) | (m_port_a_in & ~m_ddr_a);
}
WRITE8_MEMBER(lsasquad_state::lsasquad_68705_port_a_w)
{
//logerror("%04x: 68705 port A write %02x\n", space.device().safe_pc(), data);
m_port_a_out = data;
}
WRITE8_MEMBER(lsasquad_state::lsasquad_68705_ddr_a_w)
{
m_ddr_a = data;
}
/*
* Port B connections:
*
* all bits are logical 1 when read (+5V pullup)
*
* 1 W when 1->0, enables latch which brings the command from main CPU (read from port A)
* 2 W when 0->1, copies port A to the latch for the main CPU
*/
READ8_MEMBER(lsasquad_state::lsasquad_68705_port_b_r)
{
return (m_port_b_out & m_ddr_b) | (m_port_b_in & ~m_ddr_b);
}
WRITE8_MEMBER(lsasquad_state::lsasquad_68705_port_b_w)
{
//logerror("%04x: 68705 port B write %02x\n", space.device().safe_pc(), data);
if ((m_ddr_b & 0x02) && (~data & 0x02) && (m_port_b_out & 0x02))
{
m_port_a_in = m_from_main;
if (m_main_sent)
m_mcu->set_input_line(0, CLEAR_LINE);
m_main_sent = 0;
//logerror("read command %02x from main cpu\n", m_port_a_in);
}
if ((m_ddr_b & 0x04) && (data & 0x04) && (~m_port_b_out & 0x04))
{
//logerror("send command %02x to main cpu\n", m_port_a_out);
m_from_mcu = m_port_a_out;
m_mcu_sent = 1;
}
m_port_b_out = data;
}
WRITE8_MEMBER(lsasquad_state::lsasquad_68705_ddr_b_w)
{
m_ddr_b = data;
}
WRITE8_MEMBER(lsasquad_state::lsasquad_mcu_w)
{
//logerror("%04x: mcu_w %02x\n", space.device().safe_pc(), data);
m_from_main = data;
m_main_sent = 1;
m_mcu->set_input_line(0, ASSERT_LINE);
}
READ8_MEMBER(lsasquad_state::lsasquad_mcu_r)
{
//logerror("%04x: mcu_r %02x\n", space.device().safe_pc(), m_from_mcu);
m_mcu_sent = 0;
return m_from_mcu;
}
READ8_MEMBER(lsasquad_state::lsasquad_mcu_status_r)
{
int res = ioport("MCU")->read();
/* bit 0 = when 1, mcu is ready to receive data from main cpu */
/* bit 1 = when 0, mcu has sent data to the main cpu */
//logerror("%04x: mcu_status_r\n",space.device().safe_pc());
if (!m_main_sent)
res |= 0x01;
if (!m_mcu_sent)
res |= 0x02;
return res;
}
READ8_MEMBER(lsasquad_state::daikaiju_mcu_status_r)
{
int res = ioport("MCU")->read();
/* bit 0 = when 1, mcu is ready to receive data from main cpu */
/* bit 1 = when 0, mcu has sent data to the main cpu */
//logerror("%04x: mcu_status_r\n",space.device().safe_pc());
if (!m_main_sent)
res |= 0x01;
if (!m_mcu_sent)
res |= 0x02;
res |= ((m_sound_pending & 0x02) ^ 2) << 3; //inverted flag
m_sound_pending &= ~0x02;
return res;
}