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eis_twib: Added RxC and TxC bitclocks

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This commit is contained in:
Joakim Larsson Edstrom 2019-10-17 15:11:25 +02:00
parent 20d8dd295a
commit c81ac13d55
2 changed files with 25 additions and 0 deletions
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19
src/devices/bus/isa/eis_twib.cpp
View File

@ -91,6 +91,13 @@ WRITE8_MEMBER( isa8_eistwib_device::twib_w )
m_uart8274->cd_ba_w(offset, data);
}
TIMER_DEVICE_CALLBACK_MEMBER(isa8_eistwib_device::tick_bitclock)
{
m_uart8274->txca_w(m_bitclock);
m_uart8274->rxca_w(m_bitclock);
m_bitclock = !m_bitclock;
}
//----------------------------------------------------------
// UI I/O
@ -192,6 +199,8 @@ ioport_constructor isa8_eistwib_device::device_input_ports() const
void isa8_eistwib_device::device_add_mconfig(machine_config &config)
{
I8274_NEW(config, m_uart8274, (XTAL(14'318'181)/ 3) / 2); // Half the 4,77 MHz ISA bus CLK signal
//m_uart8274->out_rtsa_callback().set([this] (int state) { m_rts = state; });
//m_uart8274->out_txda_callback().set([this] (int state) { printf("%d ", state); });
m_uart8274->out_int_callback().set([this] (int state)
{ // Jumper field W1 decides what IRQs to pull
if (m_isairq->read() & 0x01) { LOGIRQ("TWIB IRQ2: %d\n", state); m_isa->irq2_w(state); }
@ -200,12 +209,16 @@ void isa8_eistwib_device::device_add_mconfig(machine_config &config)
if (m_isairq->read() & 0x08) { LOGIRQ("TWIB IRQ5: %d\n", state); m_isa->irq5_w(state); }
if (m_isairq->read() & 0x10) { LOGIRQ("TWIB IRQ6: %d\n", state); m_isa->irq6_w(state); }
});
TIMER(config, "bitclock").configure_periodic(FUNC(isa8_eistwib_device::tick_bitclock), attotime::from_hz(300000));
}
isa8_eistwib_device::isa8_eistwib_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
device_t(mconfig, ISA8_EIS_TWIB, tag, owner, clock)
, device_isa8_card_interface(mconfig, *this)
, m_uart8274(*this, "terminal")
, m_bitclock(false)
, m_rts(false)
, m_sw1(*this, "SW1")
, m_isairq(*this, "W1")
, m_installed(false)
@ -219,6 +232,9 @@ void isa8_eistwib_device::device_start()
{
set_isa_device();
m_installed = false;
m_bitclock = false;
save_item(NAME(m_installed));
save_item(NAME(m_bitclock));
}
void isa8_eistwib_device::device_reset()
@ -233,4 +249,7 @@ void isa8_eistwib_device::device_reset()
write8_delegate(FUNC( isa8_eistwib_device::twib_w ), this));
m_installed = true;
}
// CD and CTS input are tied to ground
m_uart8274->ctsa_w(0);
m_uart8274->dcda_w(0);
}

6
src/devices/bus/isa/eis_twib.h
View File

@ -7,6 +7,7 @@
#include "isa.h"
#include "machine/z80sio.h"
#include "machine/timer.h"
class isa8_eistwib_device :
public device_t,
@ -31,6 +32,11 @@ protected:
virtual void device_add_mconfig(machine_config &config) override;
virtual ioport_constructor device_input_ports() const override;
// Timers
TIMER_DEVICE_CALLBACK_MEMBER(tick_bitclock);
bool m_bitclock;
bool m_rts;
// helpers
required_ioport m_sw1;
required_ioport m_isairq;