summaryrefslogblamecommitdiffstatshomepage
path: root/src/mame/machine/lsasquad.cpp
blob: 7735325b58301477012eec40c016d0c3cdca12a0 (plain) (tree)
1
2
3
4
5
6
7
8
9
10
11
12

                                    
                
                        
                              
 





                                                                            
                                                        
 
                               

 
                                                       
 
                               

 
                                                     


                                                  
                                                                                          


 
                                                     


                                                  
                                                   

 
                                                   
 
                                        


                                                                        
                                                           

                   
                                                             
                                    
                                                            

                                    
 
                   
 
 
                                                   
 
                                        


                                                                        
                                                           

                   
                                                             
                                    
                                                            

                                    
 
                                                                             

                   
// license:BSD-3-Clause
// copyright-holders:Nicola Salmoria
#include "emu.h"
#include "cpu/z80/z80.h"
#include "includes/lsasquad.h"

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

 main <-> sound CPU communication

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

WRITE8_MEMBER(lsasquad_state::lsasquad_sh_nmi_disable_w)
{
	m_soundnmi->in_w<1>(0);
}

WRITE8_MEMBER(lsasquad_state::lsasquad_sh_nmi_enable_w)
{
	m_soundnmi->in_w<1>(1);
}

READ8_MEMBER(lsasquad_state::lsasquad_sound_status_r)
{
	/* bit 0: message pending for sound cpu */
	/* bit 1: message pending for main cpu */
	return (m_soundlatch->pending_r() ? 1 : 0) | (m_soundlatch2->pending_r() ? 2 : 0);
}


READ8_MEMBER(lsasquad_state::daikaiju_sound_status_r)
{
	/* bit 0: message pending for sound cpu */
	/* bit 1: message pending for main cpu */
	return (m_soundlatch->pending_r() ? 2 : 1);
}

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",m_maincpu->pc());
	if (m_bmcu)
	{
		if (CLEAR_LINE == m_bmcu->host_semaphore_r())
			res |= 0x01;
		if (CLEAR_LINE == m_bmcu->mcu_semaphore_r())
			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",m_maincpu->pc());
	if (m_bmcu)
	{
		if (CLEAR_LINE == m_bmcu->host_semaphore_r())
			res |= 0x01;
		if (CLEAR_LINE == m_bmcu->mcu_semaphore_r())
			res |= 0x02;
	}

	res |= ((m_soundlatch->pending_r() & 0x02) ^ 2) << 3; //inverted flag
	return res;
}