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added interrupt timer

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This commit is contained in:
hap 2015-02-16 23:52:44 +01:00
parent b0304d0f16
commit eeddbd3b97
1 changed files with 31 additions and 3 deletions
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34
src/mess/drivers/tb303.c
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@ -13,7 +13,6 @@
#include "emu.h"
#include "cpu/ucom4/ucom4.h"
#include "sound/speaker.h"
#include "tb303.lh"
@ -23,15 +22,41 @@ class tb303_state : public driver_device
public:
tb303_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag),
m_maincpu(*this, "maincpu")
m_maincpu(*this, "maincpu"),
m_t3_off_timer(*this, "t3_off")
{ }
required_device<cpu_device> m_maincpu;
required_device<timer_device> m_t3_off_timer;
TIMER_DEVICE_CALLBACK_MEMBER(t3_clock);
TIMER_DEVICE_CALLBACK_MEMBER(t3_off);
virtual void machine_start();
};
// T2 to MCU CLK: LC circuit, stable sine wave, 2.2us interval
#define TB303_T2_CLOCK_HZ 454545 /* in hz */
// T3 to MCU _INT: square wave, 1.8ms interval, short duty cycle
#define TB303_T3_CLOCK attotime::from_usec(1800)
#define TB303_T3_OFF (TB303_T3_CLOCK / 8)
TIMER_DEVICE_CALLBACK_MEMBER(tb303_state::t3_off)
{
m_maincpu->set_input_line(0, CLEAR_LINE);
}
TIMER_DEVICE_CALLBACK_MEMBER(tb303_state::t3_clock)
{
m_maincpu->set_input_line(0, ASSERT_LINE);
m_t3_off_timer->adjust(TB303_T3_OFF);
}
static INPUT_PORTS_START( tb303 )
INPUT_PORTS_END
@ -51,7 +76,10 @@ void tb303_state::machine_start()
static MACHINE_CONFIG_START( tb303, tb303_state )
/* basic machine hardware */
MCFG_CPU_ADD("maincpu", NEC_D650, 454545) // LC circuit, 2.2us pulse interval
MCFG_CPU_ADD("maincpu", NEC_D650, TB303_T2_CLOCK_HZ)
MCFG_TIMER_DRIVER_ADD_PERIODIC("t3_clock", tb303_state, t3_clock, TB303_T3_CLOCK)
MCFG_TIMER_DRIVER_ADD("t3_off", tb303_state, t3_off)
MCFG_DEFAULT_LAYOUT(layout_tb303)