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// license:BSD-3-Clause
// copyright-holders:smf
/*
* zs01.h
*
* Secure SerialFlash
*
*/
#ifndef MAME_MACHINE_ZS01_H
#define MAME_MACHINE_ZS01_H
#pragma once
#include "machine/ds2401.h"
class zs01_device : public device_t,
public device_nvram_interface
{
public:
// construction/destruction
zs01_device( const machine_config &mconfig, const char *tag, device_t *owner)
: zs01_device(mconfig, tag, owner, uint32_t(0))
{
}
zs01_device( const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock );
// inline configuration helpers
template <typename T> void set_ds2401_tag( T &&tag ) { m_ds2401.set_tag(std::forward<T>(tag)); }
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 ATTR_PRINTF( 3, 4 ) verboselog( int n_level, const char *s_fmt, ... );
void decrypt( uint8_t *destination, uint8_t *source, int length, uint8_t *key, uint8_t previous_byte );
void decrypt2( uint8_t *destination, uint8_t *source, int length, uint8_t *key, uint8_t previous_byte );
void encrypt( uint8_t *destination, uint8_t *source, int length, uint8_t *key, uint32_t previous_byte );
uint16_t calc_crc( uint8_t *buffer, uint32_t length );
int data_offset();
enum size_t
{
SIZE_DATA_BUFFER = 8
};
enum command_t
{
COMMAND_WRITE = 0x00,
COMMAND_READ = 0x01
};
enum state_t
{
STATE_STOP,
STATE_RESPONSE_TO_RESET,
STATE_LOAD_COMMAND,
STATE_READ_DATA
};
enum status_t
{
STATUS_OK,
STATUS_ERROR = 2,
};
enum configuration_registers_t
{
CONFIG_RR = 4, // Retry Register
CONFIG_RC = 5 // Reset Counter
};
// internal state
optional_device<ds2401_device> m_ds2401;
optional_memory_region m_region;
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_previous_byte;
uint8_t m_write_buffer[ 12 ];
uint8_t m_read_buffer[ 12 ];
uint8_t m_response_key[ 8 ];
uint8_t m_response_to_reset[ 4 ];
uint8_t m_command_key[ 8 ];
uint8_t m_data_key[ 8 ];
uint8_t m_configuration_registers[ 8 ];
uint8_t m_data[ 112 ];
};
// device type definition
DECLARE_DEVICE_TYPE(ZS01, zs01_device)
#endif // MAME_MACHINE_ZS01_H
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