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// license:BSD-3-Clause
// copyright-holders:smf
/*
* x76f100.h
*
* Secure SerialFlash
*
*/
#ifndef MAME_MACHINE_X76F100_H
#define MAME_MACHINE_X76F100_H
#pragma once
class x76f100_device : public device_t, public device_nvram_interface
{
public:
// construction/destruction
x76f100_device( const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock = XTAL());
DECLARE_WRITE_LINE_MEMBER( write_cs );
DECLARE_WRITE_LINE_MEMBER( write_rst );
DECLARE_WRITE_LINE_MEMBER( write_scl );
DECLARE_WRITE_LINE_MEMBER( write_sda );
DECLARE_READ_LINE_MEMBER( read_sda );
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:
inline void verboselog(int n_level, const char *s_fmt, ...) ATTR_PRINTF(3,4);
uint8_t *password();
void password_ok();
int data_offset();
enum command_t
{
COMMAND_WRITE = 0x80,
COMMAND_READ = 0x81,
COMMAND_CHANGE_WRITE_PASSWORD = 0xfc,
COMMAND_CHANGE_READ_PASSWORD = 0xfe,
COMMAND_ACK_PASSWORD = 0x55
};
enum state_t
{
STATE_STOP,
STATE_RESPONSE_TO_RESET,
STATE_LOAD_COMMAND,
STATE_LOAD_PASSWORD,
STATE_VERIFY_PASSWORD,
STATE_READ_DATA,
STATE_WRITE_DATA
};
optional_memory_region m_region;
// internal state
int m_cs;
int m_rst;
int m_scl;
int m_sdaw;
int m_sdar;
int m_state;
int m_shift;
int m_bit;
int m_byte;
int m_command;
int m_password_retry_counter;
bool m_is_password_accepted;
uint8_t m_write_buffer[ 8 ];
uint8_t m_response_to_reset[ 4 ];
uint8_t m_write_password[ 8 ];
uint8_t m_read_password[ 8 ];
uint8_t m_data[ 112 ];
};
// device type definition
DECLARE_DEVICE_TYPE(X76F100, x76f100_device)
#endif // MAME_MACHINE_X76F100_H
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