// license:BSD-3-Clause
// copyright-holders:Aaron Giles, smf, Grull Osgo
/*
* DS1994
*
* Dallas Semiconductor
* 1-Wire Protocol
* RTC + BACKUP RAM
*
*/
#ifndef MAME_MACHINE_DS1994_H
#define MAME_MACHINE_DS1994_H
#pragma once
class ds1994_device : public device_t, public device_nvram_interface
{
public:
// construction/destruction
ds1994_device(const machine_config &mconfig, const char *tag, device_t *owner)
: ds1994_device(mconfig, tag, owner, uint32_t(0))
{
}
ds1994_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
// inline configuration helpers
void ref_year(uint32_t year) { m_ref_year = year; }
void ref_month(uint8_t month) { m_ref_month = month; }
void ref_day(uint8_t day) { m_ref_day = day; }
void write(int state);
int read();
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
// device_nvram_interface overrides
virtual void nvram_default() override;
virtual bool nvram_read(util::read_stream &file) override;
virtual bool nvram_write(util::write_stream &file) override;
private:
enum {
ROM_SIZE = 8,
DATA_SIZE = 0x202,
SPD_SIZE = 0x20,
RTC_SIZE = 0x05,
REGS_SIZE = 0x19,
// Rom Commands
ROMCMD_READROM = 0x33,
ROMCMD_MATCHROM = 0x55,
ROMCMD_SEARCHROM = 0xf0,
ROMCMD_SEARCHINT = 0xec,
ROMCMD_SKIPROM = 0xcc,
// Memory Commands
COMMAND_READ_MEMORY = 0xf0,
COMMAND_WRITE_SCRATCHPAD = 0x0f,
COMMAND_READ_SCRATCHPAD = 0xaa,
COMMAND_COPY_SCRATCHPAD = 0x55
};
enum {
STATE_IDLE,
STATE_RESET,
STATE_RESET1,
STATE_RESET2,
STATE_ROMCMD,
STATE_READROM,
STATE_SKIPROM,
STATE_MATCHROM,
STATE_COMMAND,
STATE_ADDRESS1,
STATE_ADDRESS2,
STATE_OFFSET,
STATE_TXADDRESS1,
STATE_TXADDRESS2,
STATE_TXOFFSET,
STATE_INIT_COMMAND,
STATE_READ_MEMORY,
STATE_WRITE_SCRATCHPAD,
STATE_READ_SCRATCHPAD,
STATE_COPY_SCRATCHPAD
};
void handle_rom_cmd(void);
void handle_cmd(void);
bool one_wire_tx_bit(uint8_t value);
bool one_wire_rx_bit(void);
uint8_t readmem();
void writemem(uint8_t value);
TIMER_CALLBACK_MEMBER(main_tick);
TIMER_CALLBACK_MEMBER(reset_tick);
TIMER_CALLBACK_MEMBER(clock_tick);
emu_timer *m_timer_main;
emu_timer *m_timer_reset;
emu_timer *m_timer_clock;
uint32_t m_ref_year;
uint8_t m_ref_month;
uint8_t m_ref_day;
uint16_t m_address;
uint16_t m_offset;
uint8_t m_a1;
uint8_t m_a2;
int m_bit, m_shift;
uint8_t m_byte;
bool m_rx, m_tx;
uint8_t m_rom[ROM_SIZE];
uint8_t m_sram[DATA_SIZE];
uint8_t m_ram[SPD_SIZE];
uint8_t m_rtc[RTC_SIZE];
uint8_t m_regs[REGS_SIZE];
int m_state[6];
int m_state_ptr;
bool m_auth;
bool m_offs_ro;
attotime t_samp, t_rdv, t_rstl, t_pdh, t_pdl;
};
// device type definition
DECLARE_DEVICE_TYPE(DS1994, ds1994_device)
#endif // MAME_MACHINE_DS1994_H