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tb303/tr606: simplified interrupt timing

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This commit is contained in:
hap 2016-02-04 20:35:06 +01:00
parent e5dde745c4
commit f6c90a7c05
2 changed files with 21 additions and 64 deletions
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42
src/mame/drivers/tb303.cpp
View File

@ -23,12 +23,9 @@ class tb303_state : public hh_ucom4_state
{
public:
tb303_state(const machine_config &mconfig, device_type type, const char *tag)
: hh_ucom4_state(mconfig, type, tag),
m_tp3_off_timer(*this, "tp3_off")
: hh_ucom4_state(mconfig, type, tag)
{ }
required_device<timer_device> m_tp3_off_timer;
UINT8 m_ram[0xc00];
UINT16 m_ram_address;
bool m_ram_ce;
@ -43,37 +40,18 @@ public:
DECLARE_READ8_MEMBER(input_r);
void update_leds();
TIMER_DEVICE_CALLBACK_MEMBER(tp3_clock);
TIMER_DEVICE_CALLBACK_MEMBER(tp3_off);
TIMER_DEVICE_CALLBACK_MEMBER(tp3_clock) { m_maincpu->set_input_line(0, ASSERT_LINE); }
TIMER_DEVICE_CALLBACK_MEMBER(tp3_clear) { m_maincpu->set_input_line(0, CLEAR_LINE); }
virtual void machine_start() override;
};
/***************************************************************************
Timer/Interrupt
***************************************************************************/
// TP2 to MCU CLK: LC circuit(TI S74230), stable sine wave, 2.2us interval
#define TP2_CLOCK_HZ 454545 /* in hz */
#define TP2_HZ 454545
// TP3 to MCU _INT: square wave, 1.8ms interval, short duty cycle
#define TP3_CLOCK attotime::from_usec(1800)
#define TP3_OFF (TP3_CLOCK / 8)
TIMER_DEVICE_CALLBACK_MEMBER(tb303_state::tp3_off)
{
m_maincpu->set_input_line(0, CLEAR_LINE);
}
TIMER_DEVICE_CALLBACK_MEMBER(tb303_state::tp3_clock)
{
m_maincpu->set_input_line(0, ASSERT_LINE);
m_tp3_off_timer->adjust(TP3_OFF);
}
#define TP3_PERIOD attotime::from_usec(1800)
#define TP3_LOW (TP3_PERIOD / 8)
/***************************************************************************
@ -270,7 +248,7 @@ void tb303_state::machine_start()
static MACHINE_CONFIG_START( tb303, tb303_state )
/* basic machine hardware */
MCFG_CPU_ADD("maincpu", NEC_D650, TP2_CLOCK_HZ)
MCFG_CPU_ADD("maincpu", NEC_D650, TP2_HZ)
MCFG_UCOM4_READ_A_CB(READ8(tb303_state, input_r))
MCFG_UCOM4_READ_B_CB(READ8(tb303_state, input_r))
MCFG_UCOM4_READ_C_CB(READ8(tb303_state, ram_r))
@ -282,9 +260,9 @@ static MACHINE_CONFIG_START( tb303, tb303_state )
MCFG_UCOM4_WRITE_H_CB(WRITE8(tb303_state, switch_w))
MCFG_UCOM4_WRITE_I_CB(WRITE8(tb303_state, strobe_w))
MCFG_TIMER_DRIVER_ADD_PERIODIC("tp3_clock", tb303_state, tp3_clock, TP3_CLOCK)
MCFG_TIMER_START_DELAY(TP3_CLOCK)
MCFG_TIMER_DRIVER_ADD("tp3_off", tb303_state, tp3_off)
MCFG_TIMER_DRIVER_ADD_PERIODIC("tp3_clock", tb303_state, tp3_clock, TP3_PERIOD)
MCFG_TIMER_START_DELAY(TP3_PERIOD - TP3_LOW)
MCFG_TIMER_DRIVER_ADD_PERIODIC("tp3_clear", tb303_state, tp3_clear, TP3_PERIOD)
MCFG_TIMER_DRIVER_ADD_PERIODIC("display_decay", hh_ucom4_state, display_decay_tick, attotime::from_msec(1))
MCFG_DEFAULT_LAYOUT(layout_tb303)

43
src/mame/drivers/tr606.cpp
View File

@ -23,43 +23,22 @@ class tr606_state : public hh_ucom4_state
{
public:
tr606_state(const machine_config &mconfig, device_type type, const char *tag)
: hh_ucom4_state(mconfig, type, tag),
m_tp3_off_timer(*this, "tp3_off")
: hh_ucom4_state(mconfig, type, tag)
{ }
required_device<timer_device> m_tp3_off_timer;
TIMER_DEVICE_CALLBACK_MEMBER(tp3_clock);
TIMER_DEVICE_CALLBACK_MEMBER(tp3_off);
TIMER_DEVICE_CALLBACK_MEMBER(tp3_clock) { m_maincpu->set_input_line(0, ASSERT_LINE); }
TIMER_DEVICE_CALLBACK_MEMBER(tp3_clear) { m_maincpu->set_input_line(0, CLEAR_LINE); }
virtual void machine_start() override;
};
/***************************************************************************
Timer/Interrupt
***************************************************************************/
// TP2 to MCU CLK: LC circuit(TI S74230), stable sine wave, 2.2us interval
#define TP2_CLOCK_HZ 454545 /* in hz */
#define TP2_HZ 454545
// MCU interrupt timing is same as in TB303
// TP3 to MCU _INT: square wave, 1.8ms interval, short duty cycle
#define TP3_CLOCK attotime::from_usec(1800)
#define TP3_OFF (TP3_CLOCK / 8)
TIMER_DEVICE_CALLBACK_MEMBER(tr606_state::tp3_off)
{
m_maincpu->set_input_line(0, CLEAR_LINE);
}
TIMER_DEVICE_CALLBACK_MEMBER(tr606_state::tp3_clock)
{
m_maincpu->set_input_line(0, ASSERT_LINE);
m_tp3_off_timer->adjust(TP3_OFF);
}
#define TP3_PERIOD attotime::from_usec(1800)
#define TP3_LOW (TP3_PERIOD / 8)
/***************************************************************************
@ -100,11 +79,11 @@ void tr606_state::machine_start()
static MACHINE_CONFIG_START( tr606, tr606_state )
/* basic machine hardware */
MCFG_CPU_ADD("maincpu", NEC_D650, TP2_CLOCK_HZ)
MCFG_CPU_ADD("maincpu", NEC_D650, TP2_HZ)
MCFG_TIMER_DRIVER_ADD_PERIODIC("tp3_clock", tr606_state, tp3_clock, TP3_CLOCK)
MCFG_TIMER_START_DELAY(TP3_CLOCK)
MCFG_TIMER_DRIVER_ADD("tp3_off", tr606_state, tp3_off)
MCFG_TIMER_DRIVER_ADD_PERIODIC("tp3_clock", tr606_state, tp3_clock, TP3_PERIOD)
MCFG_TIMER_START_DELAY(TP3_PERIOD - TP3_LOW)
MCFG_TIMER_DRIVER_ADD_PERIODIC("tp3_clear", tr606_state, tp3_clear, TP3_PERIOD)
MCFG_TIMER_DRIVER_ADD_PERIODIC("display_decay", hh_ucom4_state, display_decay_tick, attotime::from_msec(1))
MCFG_DEFAULT_LAYOUT(layout_tr606)