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// license:BSD-3-Clause
// copyright-holders:Vas Crabb
#ifndef MAME_MACHINE_SDLC_H
#define MAME_MACHINE_SDLC_H
#pragma once
#include <cstdint>
#include <memory>
#include <utility>
class device_sdlc_consumer_interface : public device_interface
{
public:
static constexpr std::uint16_t POLY_SDLC = 0x1021U;
template <typename T>
static constexpr u16 update_frame_check(u16 poly, u16 current, T bit)
{
return (current << 1) ^ ((bool(bit) != bool(BIT(current, 15))) ? poly : 0U);
}
protected:
device_sdlc_consumer_interface(machine_config const &mconfig, device_t &device);
virtual ~device_sdlc_consumer_interface();
virtual void interface_post_start() override;
void rx_bit(bool state);
void rx_reset();
bool is_line_active() const { return bool(m_line_active); }
uint16_t get_frame_check() const { return m_frame_check; }
bool is_frame_check_good() const { return 0x1d0fU == m_frame_check; }
private:
template <typename... Params> void logerror(Params &&... args) { device().logerror(std::forward<Params>(args)...); }
virtual void frame_start() { }
virtual void frame_end() { }
virtual void frame_abort() { }
virtual void line_active() { }
virtual void line_inactive() { }
virtual void data_bit(bool value) { }
std::uint8_t m_line_active;
std::uint8_t m_discard_bits;
std::uint8_t m_in_frame;
std::uint16_t m_shift_register;
std::uint16_t m_frame_check;
};
class sdlc_logger_device : public device_t, public device_sdlc_consumer_interface
{
public:
sdlc_logger_device(machine_config const &mconfig, char const *tag, device_t *owner, std::uint32_t clock);
virtual ~sdlc_logger_device();
// input signals
void data_w(int state) { m_current_data = state ? 1U : 0U; }
void clock_w(int state);
// input format configuration
void data_nrzi(int state) { m_data_nrzi = state ? 1U : 0U; }
void clock_active(int state) { m_clock_active = state ? 1U : 0U; }
protected:
virtual void device_start() override ATTR_COLD;
virtual void device_reset() override ATTR_COLD;
using device_t::logerror;
private:
enum : std::size_t
{
BUFFER_BYTES = 1024U,
BUFFER_BITS = BUFFER_BYTES << 3
};
virtual void frame_start() override;
virtual void frame_end() override;
virtual void frame_abort() override;
virtual void data_bit(bool value) override;
void shift_residual_bits();
void log_frame(bool partial) const;
std::uint8_t m_data_nrzi;
std::uint8_t m_clock_active;
std::uint8_t m_current_data;
std::uint8_t m_last_data;
std::uint8_t m_current_clock;
std::uint32_t m_frame_bits;
std::uint16_t m_expected_fcs;
std::unique_ptr<std::uint8_t []> m_buffer;
};
DECLARE_DEVICE_TYPE(SDLC_LOGGER, sdlc_logger_device)
#endif // MAME_MACHINE_SDLC_H
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