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upd7810: correctly deal with external interrupts

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This commit is contained in:
Ramiro Polla 2014-11-02 23:40:49 +01:00
parent 10e4408757
commit adffc17cf5
2 changed files with 27 additions and 15 deletions
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37
src/emu/cpu/upd7810/upd7810.c
View File

@ -1616,6 +1616,7 @@ void upd7810_device::base_device_start()
save_item(NAME(m_ovcf));
save_item(NAME(m_ovcs));
save_item(NAME(m_edges));
save_item(NAME(m_nmi));
save_item(NAME(m_int1));
save_item(NAME(m_int2));
@ -1797,6 +1798,7 @@ void upd7810_device::device_reset()
m_co1 = 0;
m_irr = 0;
m_itf = 0;
m_nmi = 0;
m_int1 = 0;
m_int2 = 0;
@ -1970,22 +1972,31 @@ void upd7801_device::execute_set_input(int irqline, int state)
void upd7810_device::execute_set_input(int irqline, int state)
{
if (state != CLEAR_LINE)
{
if (irqline == INPUT_LINE_NMI)
{
/* no nested NMIs ? */
// if (0 == (IRR & INTNMI))
switch (irqline) {
case INPUT_LINE_NMI:
/* NMI is falling edge sensitive */
if ( m_nmi == ASSERT_LINE && state == CLEAR_LINE )
IRR |= INTNMI;
}
else
if (irqline == UPD7810_INTF1)
m_nmi = state;
break;
case UPD7810_INTF1:
/* INT1 is rising edge sensitive */
if ( m_int1 == CLEAR_LINE && state == ASSERT_LINE )
IRR |= INTF1;
else
if ( irqline == UPD7810_INTF2 && ( MKL & 0x20 ) )
m_int1 = state;
break;
case UPD7810_INTF2:
/* INT2 is falling edge sensitive */
if ( m_int2 == ASSERT_LINE && state == CLEAR_LINE )
IRR |= INTF2;
else
logerror("upd7810_set_irq_line invalid irq line #%d\n", irqline);
m_int2 = state;
break;
default:
logerror("upd7810_set_irq_line invalid irq line #%d\n", irqline);
break;
}
/* resetting interrupt requests is done with the SKIT/SKNIT opcodes only! */
}

5
src/emu/cpu/upd7810/upd7810.h
View File

@ -294,8 +294,9 @@ protected:
UINT8 m_co1;
UINT16 m_irr; /* interrupt request register */
UINT16 m_itf; /* interrupt test flag register */
int m_int1; /* keep track of current int1 state. Needed for 7801 irq checking. */
int m_int2; /* keep track to current int2 state. Needed for 7801 irq checking. */
int m_nmi; /* keep track of current nmi state. Needed for 7810 irq checking. */
int m_int1; /* keep track of current int1 state. Needed for irq checking. */
int m_int2; /* keep track to current int2 state. Needed for irq checking. */
/* internal helper variables */
UINT16 m_txs; /* transmitter shift register */