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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
eeprom.h
Base class for EEPROM devices.
***************************************************************************/
#ifndef MAME_MACHINE_EEPROM_H
#define MAME_MACHINE_EEPROM_H
#pragma once
class eeprom_base_device : public device_t,
public device_nvram_interface
{
public:
// timing constants
enum timing_type
{
WRITE_TIME, // default = 2ms
WRITE_ALL_TIME, // default = 8ms
ERASE_TIME, // default = 1ms
ERASE_ALL_TIME, // default = 8ms
TIMING_COUNT
};
// inline configuration helpers
eeprom_base_device& size(int cells, int cellbits);
eeprom_base_device& default_data(const uint8_t *data, uint32_t size);
eeprom_base_device& default_data(const uint16_t *data, uint32_t size);
eeprom_base_device& default_value(uint32_t value) { m_default_value = value; m_default_value_set = true; return *this; }
eeprom_base_device& timing(timing_type type, const attotime &duration) { m_operation_time[type] = duration; return *this; }
eeprom_base_device& write_time(const attotime &duration) { m_operation_time[eeprom_base_device::WRITE_TIME] = duration; return *this; }
eeprom_base_device& write_all_time(const attotime &duration) { m_operation_time[eeprom_base_device::WRITE_ALL_TIME] = duration; return *this; }
eeprom_base_device& erase_time(const attotime &duration) { m_operation_time[eeprom_base_device::ERASE_TIME] = duration; return *this; }
eeprom_base_device& erase_all_time(const attotime &duration) { m_operation_time[eeprom_base_device::ERASE_ALL_TIME] = duration; return *this; }
// read/write/erase data
uint32_t read(offs_t address);
void write(offs_t address, uint32_t data);
void write_all(uint32_t data);
void erase(offs_t address);
void erase_all();
// status
bool ready() const { return machine().time() >= m_completion_time; }
// internal read/write without side-effects
uint32_t internal_read(offs_t address);
void internal_write(offs_t address, uint32_t data);
protected:
// construction/destruction
eeprom_base_device(const machine_config &mconfig, device_type devtype, const char *tag, device_t *owner);
// device-level overrides
virtual void device_validity_check(validity_checker &valid) const override;
virtual void device_start() override ATTR_COLD;
virtual void device_reset() override ATTR_COLD;
// 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;
optional_memory_region m_region;
std::unique_ptr<uint8_t []> m_data;
// configuration state
uint32_t m_cells;
uint8_t m_address_bits;
uint8_t m_data_bits;
const void * m_default_data;
uint32_t m_default_data_size;
uint32_t m_default_value;
bool m_default_value_set;
attotime m_operation_time[TIMING_COUNT];
// live state
attotime m_completion_time;
};
#endif // MAME_MACHINE_EEPROM_H
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