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// license:BSD-3-Clause
// copyright-holders:Ariane Fugmann
#ifndef MAME_MACHINE_M2COMM_H
#define MAME_MACHINE_M2COMM_H
#pragma once
#define M2COMM_SIMULATION
#include "osdfile.h"
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
class m2comm_device : public device_t
{
public:
// construction/destruction
m2comm_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
// single bit registers (74LS74)
uint8_t zfg_r(offs_t offset);
void zfg_w(uint8_t data);
// shared memory 16k (these are actually 2x 16k bank switched)
uint8_t share_r(offs_t offset);
void share_w(offs_t offset, uint8_t data);
// public API - stuff that gets called from host
// shared memory 16k
// reads/writes at I/O 0x01a10000-0x01a13fff
// - share_r
// - share_w
// single bit registers (74LS74)
// reads/writes at I/O 0x01a14000
uint8_t cn_r();
void cn_w(uint8_t data);
// reads/writes at I/O 0x01a14002
uint8_t fg_r();
void fg_w(uint8_t data);
// IRQ logic - 5 = VINT, 7 = DLC
void check_vint_irq();
void set_frameoffset(uint16_t offset) { m_frameoffset = offset; }
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
virtual void device_add_mconfig(machine_config &config) override;
private:
uint8_t m_shared[0x4000]{}; // 16k shared memory
uint8_t m_zfg = 0; // z80 flip gate - bit 0 switches memory banks, bit7 is connected to FG bit 0
uint8_t m_cn = 0; // bit0 is used to enable/disable the comm board
uint8_t m_fg = 0; // i960 flip gate - bit0 is stored, bit7 is connected to ZFG bit 0
osd_file::ptr m_line_rx; // rx line - can be either differential, simple serial or toslink
osd_file::ptr m_line_tx; // tx line - is differential, simple serial and toslink
char m_localhost[256]{};
char m_remotehost[256]{};
uint8_t m_buffer0[0x1000]{};
uint8_t m_buffer1[0x1000]{};
uint8_t m_framesync;
uint16_t m_frameoffset;
#ifdef M2COMM_SIMULATION
uint8_t m_linkenable = 0;
uint16_t m_linktimer = 0;
uint8_t m_linkalive = 0;
uint8_t m_linkid = 0;
uint8_t m_linkcount = 0;
uint8_t m_zfg_delay = 0;
void comm_tick();
void read_fg();
int read_frame(int dataSize);
void send_data(uint8_t frameType, int frameStart, int frameSize, int dataSize);
void send_frame(int dataSize);
#endif
};
// device type definition
DECLARE_DEVICE_TYPE(M2COMM, m2comm_device)
#endif // MAME_MACHINE_M2COMM_H
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