diff options
Diffstat (limited to 'src/devices/bus/a2bus/a2sd.cpp')
-rw-r--r-- | src/devices/bus/a2bus/a2sd.cpp | 68 |
1 files changed, 61 insertions, 7 deletions
diff --git a/src/devices/bus/a2bus/a2sd.cpp b/src/devices/bus/a2bus/a2sd.cpp index e415ece84bc..14e6ad88c14 100644 --- a/src/devices/bus/a2bus/a2sd.cpp +++ b/src/devices/bus/a2bus/a2sd.cpp @@ -22,13 +22,18 @@ #include "emu.h" #include "a2sd.h" +#include "machine/at28c64b.h" +#include "machine/spi_sdcard.h" + #define LOG_SPI (1U << 1) -//#define VERBOSE (LOG_COMMAND) +//#define VERBOSE (LOG_GENERAL) #define LOG_OUTPUT_FUNC osd_printf_info #include "logmacro.h" +namespace { + /*************************************************************************** PARAMETERS ***************************************************************************/ @@ -41,17 +46,56 @@ static constexpr u8 C0N1_TC = 0x80; // SPI transfer complete static constexpr u8 C0N3_CD = 0x40; // card detect static constexpr u8 C0N3_BIT_SS = 7; -//************************************************************************** -// GLOBAL VARIABLES -//************************************************************************** - -DEFINE_DEVICE_TYPE(A2BUS_A2SD, a2bus_a2sd_device, "a2sd", "Apple II SD Card") - ROM_START( a2sd ) ROM_REGION(0x2000, "flash", ROMREGION_ERASE00) ROM_LOAD( "appleiisd.bin", 0x000000, 0x000800, CRC(e82eea8a) SHA1(7e0acef01e622eeed6f8e87893d07c701bbef016) ) ROM_END +//************************************************************************** +// TYPE DEFINITIONS +//************************************************************************** + +class a2bus_a2sd_device: + public device_t, + public device_a2bus_card_interface +{ +public: + // construction/destruction + a2bus_a2sd_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock); + +protected: + a2bus_a2sd_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock); + + virtual void device_start() override ATTR_COLD; + virtual void device_reset() override ATTR_COLD; + virtual void device_add_mconfig(machine_config &config) override ATTR_COLD; + virtual const tiny_rom_entry *device_rom_region() const override ATTR_COLD; + + // overrides of standard a2bus slot functions + virtual u8 read_c0nx(u8 offset) override; + virtual void write_c0nx(u8 offset, u8 data) override; + virtual u8 read_cnxx(u8 offset) override; + virtual void write_cnxx(u8 offset, u8 data) override; + virtual u8 read_c800(uint16_t offset) override; + virtual void write_c800(uint16_t offset, u8 data) override; + + // SPI 4-wire interface + void spi_miso_w(int state) { m_in_bit = state; } + + TIMER_CALLBACK_MEMBER(shift_tick); + +private: + required_device<at28c64b_device> m_flash; + required_device<spi_sdcard_device> m_sdcard; + + u8 m_datain, m_in_latch, m_out_latch; + u8 m_c0n1, m_c0n3; + int m_in_bit; + + int m_shift_count; + emu_timer *m_shift_timer; +}; + /*************************************************************************** FUNCTION PROTOTYPES ***************************************************************************/ @@ -64,6 +108,7 @@ void a2bus_a2sd_device::device_add_mconfig(machine_config &config) AT28C64B(config, m_flash, 0); SPI_SDCARD(config, m_sdcard, 0); + m_sdcard->set_prefer_sdhc(); m_sdcard->spi_miso_callback().set(FUNC(a2bus_a2sd_device::spi_miso_w)); } @@ -277,3 +322,12 @@ void a2bus_a2sd_device::write_c800(u16 offset, u8 data) { m_flash->write(offset + 0x100, data); } + +} // anonymous namespace + + +//************************************************************************** +// GLOBAL VARIABLES +//************************************************************************** + +DEFINE_DEVICE_TYPE_PRIVATE(A2BUS_A2SD, device_a2bus_card_interface, a2bus_a2sd_device, "a2sd", "Apple II SD Card") |