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// license:BSD-3-Clause
// copyright-holders:Phil Stroffolino
#include "emu.h"
#include "includes/tigeroad.h"
READ16_MEMBER(pushman_state::mcu_comm_r)
{
switch (offset & 0x03)
{
case 0: // read and acknowledge MCU reply
if (!machine().side_effects_disabled())
m_mcu_semaphore = false;
return m_mcu_latch;
case 2: // expects bit 0 to be high when MCU has accepted command (other bits ignored)
return m_host_semaphore ? 0xfffe : 0xffff;
case 3: // expects bit 0 to be low when MCU has sent response (other bits ignored)
return m_mcu_semaphore ? 0xfffe : 0xffff;
}
logerror("unknown MCU read offset %X & %04X\n", offset, mem_mask);
return 0xffff;
}
WRITE16_MEMBER(pushman_state::pushman_mcu_comm_w)
{
switch (offset & 0x01)
{
case 0:
m_host_latch = swapendian_int16(data);
break;
case 1:
m_mcu->pd_w(data & 0x00ff);
m_host_semaphore = true;
m_mcu->set_input_line(M68705_IRQ_LINE, ASSERT_LINE);
break;
}
}
WRITE16_MEMBER(pushman_state::bballs_mcu_comm_w)
{
m_host_latch = data;
m_host_semaphore = true;
m_mcu->set_input_line(M68705_IRQ_LINE, ASSERT_LINE);
}
void pushman_state::mcu_pa_w(uint8_t data)
{
m_mcu_output = (m_mcu_output & 0xff00) | (u16(data) & 0x00ff);
}
void pushman_state::mcu_pb_w(uint8_t data)
{
m_mcu_output = (m_mcu_output & 0x00ff) | (u16(data) << 8);
}
void pushman_state::mcu_pc_w(uint8_t data)
{
if (BIT(data, 0))
{
m_mcu->pa_w(0xff);
m_mcu->pb_w(0xff);
}
else
{
m_host_semaphore = false;
m_mcu->set_input_line(M68705_IRQ_LINE, CLEAR_LINE);
m_mcu->pa_w((m_host_latch >> 0) & 0x00ff);
m_mcu->pb_w((m_host_latch >> 8) & 0x00ff);
}
if (BIT(m_mcu_latch_ctl, 1) && !BIT(data, 1))
{
m_mcu_latch = m_mcu_output & (BIT(m_mcu_latch_ctl, 0) ? 0xffff : m_host_latch);
m_mcu_semaphore = true;
}
m_mcu_latch_ctl = data;
}
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