//-------------------------------------------------
// daisy_get_irq_device - return the device
// in the chain that requested the interrupt
//-------------------------------------------------
public device_z80daisy_interface daisy_get_irq_device()
{
// loop over all devices; dev[0] is the highest priority
for (device_z80daisy_interface intf = m_chain; intf != null; intf = intf.m_daisy_next)
{
// if this device is asserting the INT line, that's the one we want
int state = intf.z80daisy_irq_state();
if ((state & Z80_DAISY_INT) != 0)
{
return(intf);
}
}
if (VERBOSE && daisy_chain_present())
{
device().logerror("Interrupt from outside Z80 daisy chain\n");
}
return(null);
}
device_z80daisy_interface m_chain; // head of the daisy chain
// construction/destruction
//-------------------------------------------------
// z80_daisy_chain_interface - constructor
//-------------------------------------------------
public z80_daisy_chain_interface(machine_config mconfig, device_t device)
: base(device, "z80daisychain")
{
m_daisy_config = null;
m_chain = null;
}
public device_z80daisy_interface m_daisy_next; // next device in the chain
// construction/destruction
//-------------------------------------------------
// device_z80daisy_interface - constructor
//-------------------------------------------------
device_z80daisy_interface(machine_config mconfig, device_t device)
: base(device, "z80daisy")
{
m_daisy_next = null;
}