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Diffstat (limited to 'src/mame/sega/s32comm.h')
-rw-r--r-- | src/mame/sega/s32comm.h | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/src/mame/sega/s32comm.h b/src/mame/sega/s32comm.h new file mode 100644 index 00000000000..9c60a44b422 --- /dev/null +++ b/src/mame/sega/s32comm.h @@ -0,0 +1,92 @@ +// license:BSD-3-Clause +// copyright-holders:Ariane Fugmann +#ifndef MAME_SEGA_S32COMM_H +#define MAME_SEGA_S32COMM_H + +#pragma once + +#define S32COMM_SIMULATION + +#include "osdfile.h" + + +//************************************************************************** +// TYPE DEFINITIONS +//************************************************************************** + +class s32comm_device : public device_t +{ +public: + // construction/destruction + s32comm_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 2k + 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 2k + // reads/writes at I/O 0x800xxx + // - share_r + // - share_w + // single bit registers (74LS74) + // reads/writes at I/O 0x801000 + uint8_t cn_r(); + void cn_w(uint8_t data); + // reads/writes at I/O 0x801002 + uint8_t fg_r(); + void fg_w(uint8_t data); + + // IRQ logic - 5 = VINT, 7 = DLC + void check_vint_irq(); +#ifdef S32COMM_SIMULATION + void set_linktype(uint16_t linktype); +#endif + +protected: + // device-level overrides + virtual void device_start() override ATTR_COLD; + virtual void device_reset() override ATTR_COLD; + // optional information overrides + virtual void device_add_mconfig(machine_config &config) override ATTR_COLD; + +private: + uint8_t m_shared[0x800]{}; // 2k shared memory + uint8_t m_zfg = 0; // z80 flip gate? purpose unknown, bit0 is stored + uint8_t m_cn = 0; // bit0 is used to enable/disable the comm board + uint8_t m_fg = 0; // flip gate? purpose unknown, 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[0x100]{}; + uint8_t m_buffer1[0x100]{}; + uint8_t m_framesync = 0; + +#ifdef S32COMM_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; + uint16_t m_linktype = 0; + + void comm_tick(); + int read_frame(int dataSize); + void send_data(uint8_t frameType, int frameStart, int frameSize, int dataSize); + void send_frame(int dataSize); + + void comm_tick_14084(); + void comm_tick_15033(); + void comm_tick_15612(); +#endif +}; + +// device type definition +DECLARE_DEVICE_TYPE(S32COMM, s32comm_device) + +#endif // MAME_SEGA_S32COMM_H |