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upd7725: add preliminary IRQ support [Lord Nightmare]

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Lord-Nightmare 2017-03-15 19:33:09 -04:00
parent cb1a5c91e8
commit 830d02ada0
1 changed files with 4 additions and 1 deletions
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5
src/devices/cpu/upd7725/upd7725.cpp
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@ -277,7 +277,10 @@ void necdsp_device::execute_set_input(int inputnum, int state)
switch (inputnum)
{
case NECDSP_INPUT_LINE_INT:
//TODO: detect rising edge; if rising edge found AND IE = 1, push PC, pc = 0x100; else do nothing
if ( ((m_irq == 0) && (state == 1)) && (regs.sr.ei == 1)) // detect rising edge AND if EI == 1;
{
regs.stack[regs.sp++] = regs.pc; regs.pc = 0x0100; regs.sp &= 0xf; regs.sr.ei = 0; return; //push PC, pc = 0x100
}
m_irq = state; // set old state to current state
break;
// add more when needed