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// license:BSD-3-Clause
// copyright-holders:R. Belmont
#ifndef MAME_MACHINE_SPI_SDCARD_H
#define MAME_MACHINE_SPI_SDCARD_H
#pragma once
#include "imagedev/harddriv.h"
#include <vector>
class spi_sdcard_device : public device_t
{
public:
spi_sdcard_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock = 0);
virtual ~spi_sdcard_device();
void set_prefer_sd() { m_preferred_type = SD_TYPE_V2; }
void set_prefer_sdhc() { m_preferred_type = SD_TYPE_HC; }
// SPI 4-wire interface
auto spi_miso_callback() { return write_miso.bind(); }
void spi_clock_w(int state);
void spi_ss_w(int state);
void spi_mosi_w(int state) { m_in_bit = state; }
bool get_card_present() { return m_image->exists(); }
devcb_write_line write_miso;
protected:
spi_sdcard_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock);
virtual void device_start() override ATTR_COLD;
virtual void device_add_mconfig(machine_config &config) override ATTR_COLD;
required_device<harddisk_image_device> m_image;
private:
enum sd_type : u8
{
SD_TYPE_V2,
SD_TYPE_HC
};
enum sd_state : u8;
// MMFS for Acorn machines expect dummy byte before response
static constexpr u8 SPI_DELAY_RESPONSE = 1;
std::error_condition image_loaded(device_image_interface &image);
void image_unloaded(device_image_interface &image);
void send_data(u16 count, sd_state new_state, u8 delay = SPI_DELAY_RESPONSE);
void do_command();
void change_state(sd_state new_state);
void latch_in();
void shift_out();
// configuration
sd_type m_preferred_type;
// mounted image info
std::vector<u8> m_sectorbuf;
u16 m_blksize;
sd_type m_type;
u8 m_csd[16];
// live state
std::unique_ptr<u8 []> m_data;
u8 m_cmd[6];
sd_state m_state;
u8 m_ss, m_in_bit, m_clk_state;
u8 m_in_latch, m_out_latch, m_cur_bit;
u8 m_out_delay;
u16 m_out_count, m_out_ptr, m_write_ptr;
u16 m_xferblk;
u32 m_blknext;
bool m_crc_off;
bool m_bACMD;
};
DECLARE_DEVICE_TYPE(SPI_SDCARD, spi_sdcard_device)
#endif // MAME_MACHINE_SPI_SDCARD_H
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