// license:BSD-3-Clause // copyright-holders:Couriersud /********************************************************************** 8 bit latch interface and emulation 2008/08 couriersud **********************************************************************/ #include "emu.h" #include "latch8.h" void latch8_device::update(UINT8 new_val, UINT8 mask) { UINT8 old_val = m_value; m_value = (m_value & ~mask) | (new_val & mask); if (m_has_write) { int i; UINT8 changed = old_val ^ m_value; for (i=0; i<8; i++) if (((changed & (1<generic_space(), m_offset[i] , (m_value >> i) & 1); if (i==1 && !m_write_1.isnull()) m_write_1(machine().driver_data()->generic_space(), m_offset[i] , (m_value >> i) & 1); if (i==2 && !m_write_2.isnull()) m_write_2(machine().driver_data()->generic_space(), m_offset[i] , (m_value >> i) & 1); if (i==3 && !m_write_3.isnull()) m_write_3(machine().driver_data()->generic_space(), m_offset[i] , (m_value >> i) & 1); if (i==4 && !m_write_4.isnull()) m_write_4(machine().driver_data()->generic_space(), m_offset[i] , (m_value >> i) & 1); if (i==5 && !m_write_5.isnull()) m_write_5(machine().driver_data()->generic_space(), m_offset[i] , (m_value >> i) & 1); if (i==6 && !m_write_6.isnull()) m_write_6(machine().driver_data()->generic_space(), m_offset[i] , (m_value >> i) & 1); if (i==7 && !m_write_7.isnull()) m_write_7(machine().driver_data()->generic_space(), m_offset[i] , (m_value >> i) & 1); } } } TIMER_CALLBACK_MEMBER( latch8_device::timerproc ) { UINT8 new_val = param & 0xFF; UINT8 mask = param >> 8; update( new_val, mask); } /* ----------------------------------------------------------------------- */ READ8_MEMBER( latch8_device::read ) { UINT8 res; assert(offset == 0); res = m_value; if (m_has_read) { int i; for (i=0; i<8; i++) { if (i==0 && !m_read_0.isnull()) { res &= ~( 1 << i); res |= ((m_read_0(space, 0, 0xff) >> m_offset[i]) & 0x01) << i; } if (i==1 && !m_read_1.isnull()) { res &= ~( 1 << i); res |= ((m_read_1(space, 0, 0xff) >> m_offset[i]) & 0x01) << i; } if (i==2 && !m_read_2.isnull()) { res &= ~( 1 << i); res |= ((m_read_2(space, 0, 0xff) >> m_offset[i]) & 0x01) << i; } if (i==3 && !m_read_3.isnull()) { res &= ~( 1 << i); res |= ((m_read_3(space, 0, 0xff) >> m_offset[i]) & 0x01) << i; } if (i==4 && !m_read_4.isnull()) { res &= ~( 1 << i); res |= ((m_read_4(space, 0, 0xff) >> m_offset[i]) & 0x01) << i; } if (i==5 && !m_read_5.isnull()) { res &= ~( 1 << i); res |= ((m_read_5(space, 0, 0xff) >> m_offset[i]) & 0x01) << i; } if (i==6 && !m_read_6.isnull()) { res &= ~( 1 << i); res |= ((m_read_6(space, 0, 0xff) >> m_offset[i]) & 0x01) << i; } if (i==7 && !m_read_7.isnull()) { res &= ~( 1 << i); res |= ((m_read_7(space, 0, 0xff) >> m_offset[i]) & 0x01) << i;} } } return (res & ~m_maskout) ^ m_xorvalue; } WRITE8_MEMBER( latch8_device::write ) { assert(offset == 0); if (m_nosync != 0xff) machine().scheduler().synchronize(timer_expired_delegate(FUNC(latch8_device::timerproc),this), (0xFF << 8) | data); else update(data, 0xFF); } WRITE8_MEMBER( latch8_device::reset_w ) { assert(offset == 0); m_value = 0; } /* read bit x */ /* return (latch >> x) & 0x01 */ UINT8 latch8_device::bitx_r( offs_t offset, int bit) { assert( offset == 0); return (m_value >> bit) & 0x01; } READ8_MEMBER( latch8_device::bit0_r) { return bitx_r(offset, 0); } READ8_MEMBER( latch8_device::bit1_r) { return bitx_r(offset, 1); } READ8_MEMBER( latch8_device::bit2_r) { return bitx_r(offset, 2); } READ8_MEMBER( latch8_device::bit3_r) { return bitx_r(offset, 3); } READ8_MEMBER( latch8_device::bit4_r) { return bitx_r(offset, 4); } READ8_MEMBER( latch8_device::bit5_r) { return bitx_r(offset, 5); } READ8_MEMBER( latch8_device::bit6_r) { return bitx_r(offset, 6); } READ8_MEMBER( latch8_device::bit7_r) { return bitx_r(offset, 7); } READ8_MEMBER( latch8_device::bit0_q_r) { return bitx_r(offset, 0) ^ 1; } READ8_MEMBER( latch8_device::bit1_q_r) { return bitx_r(offset, 1) ^ 1; } READ8_MEMBER( latch8_device::bit2_q_r) { return bitx_r(offset, 2) ^ 1; } READ8_MEMBER( latch8_device::bit3_q_r) { return bitx_r(offset, 3) ^ 1; } READ8_MEMBER( latch8_device::bit4_q_r) { return bitx_r(offset, 4) ^ 1; } READ8_MEMBER( latch8_device::bit5_q_r) { return bitx_r(offset, 5) ^ 1; } READ8_MEMBER( latch8_device::bit6_q_r) { return bitx_r(offset, 6) ^ 1; } READ8_MEMBER( latch8_device::bit7_q_r) { return bitx_r(offset, 7) ^ 1; } /* write bit x from data into bit determined by offset */ /* latch = (latch & ~(1<> x) & 0x01) << offset) */ void latch8_device::bitx_w(int bit, offs_t offset, UINT8 data) { UINT8 mask = (1<> bit) & 0x01) << offset); assert( offset < 8); /* No need to synchronize ? */ if (m_nosync & mask) update(masked_data, mask); else machine().scheduler().synchronize(timer_expired_delegate(FUNC(latch8_device::timerproc),this), (mask << 8) | masked_data); } WRITE8_MEMBER( latch8_device::bit0_w ) { bitx_w(0, offset, data); } WRITE8_MEMBER( latch8_device::bit1_w ) { bitx_w(1, offset, data); } WRITE8_MEMBER( latch8_device::bit2_w ) { bitx_w(2, offset, data); } WRITE8_MEMBER( latch8_device::bit3_w ) { bitx_w(3, offset, data); } WRITE8_MEMBER( latch8_device::bit4_w ) { bitx_w(4, offset, data); } WRITE8_MEMBER( latch8_device::bit5_w ) { bitx_w(5, offset, data); } WRITE8_MEMBER( latch8_device::bit6_w ) { bitx_w(6, offset, data); } WRITE8_MEMBER( latch8_device::bit7_w ) { bitx_w(7, offset, data); } const device_type LATCH8 = &device_creator; latch8_device::latch8_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : device_t(mconfig, LATCH8, "8 bit latch", tag, owner, clock, "latch8", __FILE__), m_value(0), m_has_write(0), m_has_read(0), m_maskout(0), m_xorvalue(0), m_nosync(0), m_write_0(*this), m_write_1(*this), m_write_2(*this), m_write_3(*this), m_write_4(*this), m_write_5(*this), m_write_6(*this), m_write_7(*this), m_read_0(*this), m_read_1(*this), m_read_2(*this), m_read_3(*this), m_read_4(*this), m_read_5(*this), m_read_6(*this), m_read_7(*this) { memset(m_offset, 0, sizeof(m_offset)); } //------------------------------------------------- // device_validity_check - validate device // configuration //------------------------------------------------- void latch8_device::device_validity_check(validity_checker &valid) const { if (!m_read_0.isnull() && !m_write_0.isnull()) osd_printf_error("Device %s: Bit 0 already has a handler.\n", tag()); if (!m_read_1.isnull() && !m_write_1.isnull()) osd_printf_error("Device %s: Bit 1 already has a handler.\n", tag()); if (!m_read_2.isnull() && !m_write_2.isnull()) osd_printf_error("Device %s: Bit 2 already has a handler.\n", tag()); if (!m_read_3.isnull() && !m_write_3.isnull()) osd_printf_error("Device %s: Bit 3 already has a handler.\n", tag()); if (!m_read_4.isnull() && !m_write_4.isnull()) osd_printf_error("Device %s: Bit 4 already has a handler.\n", tag()); if (!m_read_5.isnull() && !m_write_5.isnull()) osd_printf_error("Device %s: Bit 5 already has a handler.\n", tag()); if (!m_read_6.isnull() && !m_write_6.isnull()) osd_printf_error("Device %s: Bit 6 already has a handler.\n", tag()); if (!m_read_7.isnull() && !m_write_7.isnull()) osd_printf_error("Device %s: Bit 7 already has a handler.\n", tag()); } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void latch8_device::device_start() { m_write_0.resolve(); m_write_1.resolve(); m_write_2.resolve(); m_write_3.resolve(); m_write_4.resolve(); m_write_5.resolve(); m_write_6.resolve(); m_write_7.resolve(); m_read_0.resolve(); m_read_1.resolve(); m_read_2.resolve(); m_read_3.resolve(); m_read_4.resolve(); m_read_5.resolve(); m_read_6.resolve(); m_read_7.resolve(); /* setup nodemap */ if (!m_write_0.isnull()) m_has_write = 1; if (!m_write_1.isnull()) m_has_write = 1; if (!m_write_2.isnull()) m_has_write = 1; if (!m_write_3.isnull()) m_has_write = 1; if (!m_write_4.isnull()) m_has_write = 1; if (!m_write_5.isnull()) m_has_write = 1; if (!m_write_6.isnull()) m_has_write = 1; if (!m_write_7.isnull()) m_has_write = 1; /* setup device read handlers */ if (!m_read_0.isnull()) m_has_read = 1; if (!m_read_1.isnull()) m_has_read = 1; if (!m_read_2.isnull()) m_has_read = 1; if (!m_read_3.isnull()) m_has_read = 1; if (!m_read_4.isnull()) m_has_read = 1; if (!m_read_5.isnull()) m_has_read = 1; if (!m_read_6.isnull()) m_has_read = 1; if (!m_read_7.isnull()) m_has_read = 1; save_item(NAME(m_value)); } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void latch8_device::device_reset() { m_value = 0; }