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// license:BSD-3-Clause
// copyright-holders:Vas Crabb
#include "emu.h"
#include "graphlinkhle.h"
#include "bus/rs232/rs232.h"
#include "diserial.h"
#include <memory>
namespace {
class graph_link_hle_device
: public device_t
, public device_ti8x_link_port_byte_interface
, public device_serial_interface
{
public:
graph_link_hle_device(machine_config const &mconfig, char const *tag, device_t *owner, uint32_t clock);
protected:
virtual void device_add_mconfig(machine_config &config) override;
virtual void device_start() override;
virtual void device_reset() override;
virtual void byte_collision() override;
virtual void byte_send_timeout() override;
virtual void byte_receive_timeout() override;
virtual void byte_sent() override;
virtual void byte_received(u8 data) override;
virtual void rcv_complete() override;
virtual void tra_callback() override;
virtual void tra_complete() override;
private:
static constexpr unsigned BUFLEN = 1U << 16;
required_device<rs232_port_device> m_serial_port;
std::unique_ptr<u8 []> m_buffer;
unsigned m_head, m_tail;
bool m_empty, m_ready;
};
graph_link_hle_device::graph_link_hle_device(
machine_config const &mconfig,
char const *tag,
device_t *owner,
uint32_t clock)
: device_t(mconfig, TI8X_GRAPH_LINK_HLE, tag, owner, clock)
, device_ti8x_link_port_byte_interface(mconfig, *this)
, device_serial_interface(mconfig, *this)
, m_serial_port(*this, "rs232")
, m_buffer()
, m_head(0)
, m_tail(0)
, m_empty(true)
, m_ready(true)
{
}
void graph_link_hle_device::device_start()
{
m_buffer = std::make_unique<u8 []>(BUFLEN);
save_pointer(NAME(m_buffer), BUFLEN);
}
void graph_link_hle_device::device_reset()
{
set_data_frame(1, 8, PARITY_NONE, STOP_BITS_1);
set_rate(9600);
receive_register_reset();
transmit_register_reset();
m_head = m_tail = 0;
m_empty = true;
m_ready = true;
}
void graph_link_hle_device::device_add_mconfig(machine_config &config)
{
RS232_PORT(config, m_serial_port, default_rs232_devices, nullptr);
m_serial_port->rxd_handler().set(FUNC(graph_link_hle_device::rx_w));
}
void graph_link_hle_device::byte_collision()
{
if (m_empty)
{
m_ready = true;
}
else
{
send_byte(m_buffer[m_tail]);
m_tail = (m_tail + 1) % BUFLEN;
m_empty = m_head == m_tail;
}
}
void graph_link_hle_device::byte_send_timeout()
{
if (m_empty)
{
m_ready = true;
}
else
{
send_byte(m_buffer[m_tail]);
m_tail = (m_tail + 1) % BUFLEN;
m_empty = m_head == m_tail;
}
}
void graph_link_hle_device::byte_receive_timeout()
{
}
void graph_link_hle_device::byte_sent()
{
if (m_empty)
{
m_ready = true;
}
else
{
send_byte(m_buffer[m_tail]);
m_tail = (m_tail + 1) % BUFLEN;
m_empty = m_head == m_tail;
}
}
void graph_link_hle_device::byte_received(u8 data)
{
transmit_register_setup(data);
}
void graph_link_hle_device::rcv_complete()
{
receive_register_extract();
if (m_ready)
{
assert(m_empty);
send_byte(get_received_char());
m_ready = false;
}
else
{
m_buffer[m_head] = get_received_char();
m_head = (m_head + 1) % BUFLEN;
m_empty = false;
}
}
void graph_link_hle_device::tra_callback()
{
m_serial_port->write_txd(transmit_register_get_data_bit());
}
void graph_link_hle_device::tra_complete()
{
accept_byte();
}
} // anonymous namespace
DEFINE_DEVICE_TYPE_PRIVATE(TI8X_GRAPH_LINK_HLE, device_ti8x_link_port_interface, graph_link_hle_device, "ti8x_glinkhle", "TI-Graph Link (grey, HLE)")
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