// license:BSD-3-Clause // copyright-holders:Fabio Priuli #ifndef MAME_BUS_MEGADRIVE_EEPROM_H #define MAME_BUS_MEGADRIVE_EEPROM_H #pragma once #include "md_slot.h" #include "machine/i2cmem.h" //************************************************************************** // TYPE DEFINITIONS //************************************************************************** // ======================> md_std_eeprom_device class md_std_eeprom_device : public device_t, public device_md_cart_interface { public: // construction/destruction md_std_eeprom_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock); protected: md_std_eeprom_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock); // device-level overrides virtual void device_start() override; virtual void device_reset() override; virtual void device_add_mconfig(machine_config &config) override; // reading and writing virtual uint16_t read(offs_t offset) override; virtual void write(offs_t offset, uint16_t data, uint16_t mem_mask = ~0) override; required_device m_i2cmem; uint8_t m_i2c_mem, m_i2c_clk; }; // ======================> md_eeprom_nbajam_device class md_eeprom_nbajam_device : public md_std_eeprom_device { public: // construction/destruction md_eeprom_nbajam_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock); protected: // device-level overrides virtual void device_add_mconfig(machine_config &config) override; // reading and writing virtual uint16_t read(offs_t offset) override; virtual void write(offs_t offset, uint16_t data, uint16_t mem_mask = ~0) override; }; // ======================> md_eeprom_nbajamte_device class md_eeprom_nbajamte_device : public md_std_eeprom_device { public: // construction/destruction md_eeprom_nbajamte_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock); protected: // device-level overrides virtual void device_add_mconfig(machine_config &config) override; // reading and writing virtual uint16_t read(offs_t offset) override; virtual void write(offs_t offset, uint16_t data, uint16_t mem_mask = ~0) override; }; // ======================> md_eeprom_cslam_device (same read/write as nbajamte, but different I2C type) class md_eeprom_cslam_device : public md_std_eeprom_device { public: // construction/destruction md_eeprom_cslam_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock); protected: // device-level overrides virtual void device_add_mconfig(machine_config &config) override; // reading and writing virtual uint16_t read(offs_t offset) override; virtual void write(offs_t offset, uint16_t data, uint16_t mem_mask = ~0) override; }; // ======================> md_eeprom_nflqb_device (same read/write as nbajamte, but different I2C type) class md_eeprom_nflqb_device : public md_std_eeprom_device { public: // construction/destruction md_eeprom_nflqb_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock); protected: // device-level overrides virtual void device_add_mconfig(machine_config &config) override; // reading and writing virtual uint16_t read(offs_t offset) override; virtual void write(offs_t offset, uint16_t data, uint16_t mem_mask = ~0) override; }; // ======================> md_eeprom_nhlpa_device class md_eeprom_nhlpa_device : public md_std_eeprom_device { public: // construction/destruction md_eeprom_nhlpa_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock); protected: // device-level overrides virtual void device_add_mconfig(machine_config &config) override; // reading and writing virtual uint16_t read(offs_t offset) override; virtual void write(offs_t offset, uint16_t data, uint16_t mem_mask = ~0) override; }; // ======================> md_eeprom_blara_device (same read/write as codemast, but different I2C type) class md_eeprom_blara_device : public md_std_eeprom_device { public: // construction/destruction md_eeprom_blara_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock); protected: // device-level overrides virtual void device_add_mconfig(machine_config &config) override; // reading and writing virtual uint16_t read(offs_t offset) override; virtual void write(offs_t offset, uint16_t data, uint16_t mem_mask = ~0) override; }; // device type definition DECLARE_DEVICE_TYPE(MD_STD_EEPROM, md_std_eeprom_device) DECLARE_DEVICE_TYPE(MD_EEPROM_NBAJAM, md_eeprom_nbajam_device) DECLARE_DEVICE_TYPE(MD_EEPROM_NBAJAMTE, md_eeprom_nbajamte_device) DECLARE_DEVICE_TYPE(MD_EEPROM_CSLAM, md_eeprom_cslam_device) DECLARE_DEVICE_TYPE(MD_EEPROM_NFLQB, md_eeprom_nflqb_device) DECLARE_DEVICE_TYPE(MD_EEPROM_NHLPA, md_eeprom_nhlpa_device) DECLARE_DEVICE_TYPE(MD_EEPROM_BLARA, md_eeprom_blara_device) // TEMPORARY ADDITION UNTIL WE FIND OUT WHAT IS MISSING IN THE CORE X24C02 CODE // THIS IS A CUSTOM I2C EEPROM EMULATION THAT ALLOWS NBA JAM TO WORK enum { STATE_I2C_IDLE = 0, STATE_I2C_WAIT_STOP, STATE_I2C_DEVSEL, STATE_I2C_GET_WORD_ADDR, STATE_I2C_WRITE_DATA, STATE_I2C_READ_DATA }; // ======================> md_eeprom_nbajam_alt_device class md_eeprom_nbajam_alt_device : public md_std_eeprom_device { public: // construction/destruction md_eeprom_nbajam_alt_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock); // reading and writing virtual uint16_t read(offs_t offset) override; virtual void write(offs_t offset, uint16_t data, uint16_t mem_mask = ~0) override; protected: // device-level overrides virtual void device_start() override; private: void eeprom_i2c_init(); void idle_devsel_check(); void eeprom_i2c_update(); uint8_t eeprom_i2c_out(); std::vector m_sram; // EEPROM runtime vars uint8_t m_eeprom_sda; // current SDA uint8_t m_eeprom_prev_sda; // previous SDA uint8_t m_eeprom_scl; // current SCL uint8_t m_eeprom_prev_scl; // previous SCL uint8_t m_eeprom_cnt; // operation count in 0-9 uint8_t m_eeprom_readwrite; // read/write bit uint16_t m_eeprom_slave_mask; // dev addr uint16_t m_eeprom_word_address; // memory addr uint16_t m_eeprom_devsel; // selected device uint16_t m_eeprom_byte; // byte to be written int m_eeprom_cur_state; // current state // EEPROM physical characteristics (configured at init) uint16_t m_eeprom_mask; // size of the memory - 1 uint16_t m_eeprom_pagewrite_mask; // max number of bytes that can be written in a single write cycle }; DECLARE_DEVICE_TYPE(MD_EEPROM_NBAJAM_ALT, md_eeprom_nbajam_alt_device) #endif // MAME_BUS_MEGADRIVE_EEPROM_H