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z8: Split sio_tick into two functions (nw)

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This commit is contained in:
AJR 2019-01-21 16:49:51 -05:00
parent fb8254d751
commit 2e6e2d33d6
2 changed files with 30 additions and 23 deletions
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50
src/devices/cpu/z8/z8.cpp
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@ -481,7 +481,7 @@ bool z8_device::get_serial_in()
return (m_input[3] & Z8_P3_SIN) != 0; return (m_input[3] & Z8_P3_SIN) != 0;
} }
void z8_device::sio_tick() void z8_device::sio_receive()
{ {
if (m_receive_started) if (m_receive_started)
{ {
@ -548,31 +548,34 @@ void z8_device::sio_tick()
m_receive_count = 0; m_receive_count = 0;
} }
} }
}
if (m_transmit_sr != 0) void z8_device::sio_transmit()
{
if (m_transmit_sr == 0)
return;
m_transmit_count = (m_transmit_count + 1) & 15;
if (m_transmit_count == 0)
{ {
m_transmit_count = (m_transmit_count + 1) & 15; m_transmit_sr >>= 1;
if (m_transmit_count == 0) if (m_transmit_sr == 0)
request_interrupt(4);
else
{ {
m_transmit_sr >>= 1; // parity replaces received bit 7 if selected
if (m_transmit_sr == 0) if ((m_transmit_sr >> 1) == 3 && (m_p3m & Z8_P3M_PARITY) != 0)
request_interrupt(4);
else
{ {
// parity replaces received bit 7 if selected if (m_transmit_parity)
if ((m_transmit_sr >> 1) == 3 && (m_p3m & Z8_P3M_PARITY) != 0) m_transmit_sr |= 1;
{ else
if (m_transmit_parity) m_transmit_sr &= ~1;
m_transmit_sr |= 1;
else
m_transmit_sr &= ~1;
}
else if (BIT(m_transmit_sr, 0))
m_transmit_parity = !m_transmit_parity;
// serial output
p3_update_output();
} }
else if (BIT(m_transmit_sr, 0))
m_transmit_parity = !m_transmit_parity;
// serial output
p3_update_output();
} }
} }
} }
@ -622,7 +625,10 @@ void z8_device::timer_end()
tout_toggle(); tout_toggle();
if (T == 0 && (m_p3m & Z8_P3M_P3_SERIAL) != 0) if (T == 0 && (m_p3m & Z8_P3M_P3_SERIAL) != 0)
sio_tick(); {
sio_receive();
sio_transmit();
}
else else
request_interrupt(4 + T); request_interrupt(4 + T);

3
src/devices/cpu/z8/z8.h
View File

@ -138,7 +138,8 @@ private:
emu_timer *m_internal_timer[2]; emu_timer *m_internal_timer[2];
bool get_serial_in(); bool get_serial_in();
void sio_tick(); void sio_receive();
void sio_transmit();
template <int T> void timer_start(); template <int T> void timer_start();
template <int T> void timer_stop(); template <int T> void timer_stop();