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vtech/sdloader: Add support for SPI SD card
This commit is contained in:
Dirk Best
parent
0fb4ca2c8b
commit
6b96a5d24b
2 changed files with 122 additions and 6 deletions
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@ -6,15 +6,26 @@
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Notes:
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- Also works for VZ200
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- The loader can't format the SD card, so you need to do that yourself
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Instructions for Linux:
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* dd if=/dev/zero of=vz300.img count=2048 bs=1M
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* mkfs.vfat vz300.img
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* mount image and copy .vz files to it
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* chdman createhd -o vz300.chd -i vz300.img -c none
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TODO:
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- No SD card emulation, so only the memory expansion part works
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- SPI clock needed too fast
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***************************************************************************/
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#include "emu.h"
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#include "sdloader.h"
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#define LOG_GENERAL (1U << 0)
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#define LOG_SPI (1U << 1)
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#define VERBOSE (LOG_GENERAL)
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#include "logmacro.h"
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//**************************************************************************
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// DEVICE DEFINITIONS
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@ -68,6 +79,18 @@ const tiny_rom_entry *vtech_sdloader_device::device_rom_region() const
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return ROM_NAME( sdloader );
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}
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//-------------------------------------------------
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// device_add_mconfig - add device configuration
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//-------------------------------------------------
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void vtech_sdloader_device::device_add_mconfig(machine_config &config)
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{
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vtech_memexp_device::device_add_mconfig(config);
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SPI_SDCARD(config, m_sdcard, 0);
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m_sdcard->spi_miso_callback().set(FUNC(vtech_sdloader_device::spi_miso_w));
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}
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//**************************************************************************
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// LIVE DEVICE
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@ -79,9 +102,12 @@ const tiny_rom_entry *vtech_sdloader_device::device_rom_region() const
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vtech_sdloader_device::vtech_sdloader_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
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vtech_memexp_device(mconfig, VTECH_SDLOADER, tag, owner, clock),
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m_sdcard(*this, "sdcard"),
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m_dosbank(*this, "dosbank"),
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m_dosview(*this, "dosview"),
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m_expbank(*this, "expbank"),
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m_spi_clock_state(false),
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m_spi_clock_cycles(0),
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m_vz300_mode(false)
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{
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}
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@ -103,7 +129,16 @@ void vtech_sdloader_device::device_start()
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m_expbank->configure_entry(0, m_ram.get() + 0x10000);
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m_expbank->configure_entry(1, m_ram.get() + 0x18000);
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// allocate timer for sdcard
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m_spi_clock = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(vtech_sdloader_device::spi_clock), this));
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// register for savestates
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save_item(NAME(m_spi_clock_state));
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save_item(NAME(m_spi_clock_sysclk));
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save_item(NAME(m_spi_clock_cycles));
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save_item(NAME(m_in_bit));
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save_item(NAME(m_in_latch));
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save_item(NAME(m_out_latch));
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save_item(NAME(m_vz300_mode));
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save_pointer(NAME(m_ram), 0x20000);
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}
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@ -119,6 +154,10 @@ void vtech_sdloader_device::device_reset()
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// rom enabled
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m_dosview.select(0);
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m_spi_clock->adjust(attotime::never);
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m_spi_clock_cycles = 0;
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m_spi_clock_state = false;
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}
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@ -126,6 +165,48 @@ void vtech_sdloader_device::device_reset()
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// IMPLEMENTATION
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//**************************************************************************
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TIMER_CALLBACK_MEMBER(vtech_sdloader_device::spi_clock)
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{
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if (m_spi_clock_cycles > 0)
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{
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if (m_spi_clock_state)
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{
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m_in_latch <<= 1;
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m_in_latch &= ~0x01;
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m_in_latch |= m_in_bit;
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m_sdcard->spi_clock_w(1);
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m_spi_clock_cycles--;
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}
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else
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{
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if (m_spi_clock_cycles == 8)
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LOGMASKED(LOG_SPI, "SPI transfer start\n");
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m_sdcard->spi_mosi_w(BIT(m_out_latch, 7));
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m_sdcard->spi_clock_w(0);
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m_out_latch <<= 1;
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}
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m_spi_clock_state = !m_spi_clock_state;
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}
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else
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{
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LOGMASKED(LOG_SPI, "SPI transfer done\n");
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m_spi_clock_state = false;
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m_spi_clock->adjust(attotime::never);
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}
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}
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void vtech_sdloader_device::spi_miso_w(int state)
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{
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LOGMASKED(LOG_SPI, "spi_miso_w: %d\n", state);
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m_in_bit = state;
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}
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void vtech_sdloader_device::mapper_w(uint8_t data)
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{
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// 7654---- not used
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@ -141,23 +222,44 @@ void vtech_sdloader_device::mapper_w(uint8_t data)
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void vtech_sdloader_device::sdcfg_w(uint8_t data)
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{
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logerror("sdcfg_w: %02x\n", data);
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// 765432-- not used
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// ------1- sd card cs
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// -------0 clock speed
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LOGMASKED(LOG_SPI, "sdcfg_w: %02x\n", data);
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m_sdcard->spi_ss_w(BIT(data, 1));
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m_spi_clock_sysclk = bool(BIT(data, 0));
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m_spi_clock_state = false;
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m_spi_clock->adjust(attotime::never);
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}
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uint8_t vtech_sdloader_device::sdio_r()
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{
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logerror("sdio_r\n");
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return 0xff;
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LOGMASKED(LOG_SPI, "sdio_r: %02x\n", m_in_latch);
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return m_in_latch;
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}
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void vtech_sdloader_device::sdio_w(uint8_t data)
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{
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logerror("sdio_w: %02x\n", data);
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LOGMASKED(LOG_SPI, "sdio_w: %02x\n", data);
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m_out_latch = data;
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m_spi_clock_cycles = 8;
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// TODO: too fast, also slightly different on vz200
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// code only waits for a single NOP before sending the next byte
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if (m_spi_clock_sysclk)
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m_spi_clock->adjust(attotime::from_hz(17.734470_MHz_XTAL / 1.5), 0, attotime::from_hz(17.734470_MHz_XTAL / 1.5));
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else
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m_spi_clock->adjust(attotime::from_hz(100_kHz_XTAL), 0, attotime::from_hz(100_kHz_XTAL));
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}
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void vtech_sdloader_device::mode_w(uint8_t data)
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{
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logerror("Switching to %s mode\n", BIT(data, 0) ? "VZ-300" : "VZ-200");
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LOG("Switching to %s mode\n", BIT(data, 0) ? "VZ-300" : "VZ-200");
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m_vz300_mode = bool(BIT(data, 0));
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}
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@ -11,6 +11,7 @@
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#pragma once
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#include "machine/spi_sdcard.h"
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#include "memexp.h"
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@ -30,6 +31,7 @@ public:
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protected:
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virtual const tiny_rom_entry *device_rom_region() const override;
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virtual void device_add_mconfig(machine_config &config) override;
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virtual void device_start() override;
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virtual void device_reset() override;
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@ -37,10 +39,14 @@ protected:
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virtual void io_map(address_map &map) override;
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private:
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required_device<spi_sdcard_device> m_sdcard;
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required_memory_bank m_dosbank;
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memory_view m_dosview;
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memory_bank_creator m_expbank;
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TIMER_CALLBACK_MEMBER(spi_clock);
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void spi_miso_w(int state);
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void mapper_w(uint8_t data);
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void sdcfg_w(uint8_t data);
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uint8_t sdio_r();
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@ -50,6 +56,14 @@ private:
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uint8_t exp_ram_r(offs_t offset);
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void exp_ram_w(offs_t offset, uint8_t data);
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emu_timer *m_spi_clock;
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bool m_spi_clock_state;
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bool m_spi_clock_sysclk;
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int m_spi_clock_cycles;
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int m_in_bit;
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uint8_t m_in_latch;
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uint8_t m_out_latch;
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std::unique_ptr<uint8_t[]> m_ram;
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bool m_vz300_mode;
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};
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