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// license: GPL-2.0+
// copyright-holders: Dirk Best
/***************************************************************************
BennVenn SD Loader for VZ300
Notes:
- Also works for VZ200
- The loader can't format the SD card, so you need to do that yourself
Instructions for Linux:
* dd if=/dev/zero of=vz300.img count=2048 bs=1M
* mkfs.vfat vz300.img
* mount image and copy .vz files to it
* chdman createhd -o vz300.chd -i vz300.img -c none
TODO:
- SPI clock needed too fast
***************************************************************************/
#include "emu.h"
#include "sdloader.h"
#define LOG_GENERAL (1U << 0)
#define LOG_SPI (1U << 1)
#define VERBOSE (LOG_GENERAL)
#include "logmacro.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
DEFINE_DEVICE_TYPE(VTECH_SDLOADER, vtech_sdloader_device, "vtech_sdloader", "BennVenn SD Loader")
//-------------------------------------------------
// mem_map - memory space address map
//-------------------------------------------------
void vtech_sdloader_device::mem_map(address_map &map)
{
map.unmap_value_high();
map(0x4000, 0x67ff).view(m_dosview);
m_dosview[0](0x4000, 0x67ff).rom().region("software", 0).bankw(m_dosbank);
m_dosview[1](0x4000, 0x67ff).bankrw(m_dosbank);
map(0x9000, 0xffff).rw(FUNC(vtech_sdloader_device::exp_ram_r), FUNC(vtech_sdloader_device::exp_ram_w));
}
//-------------------------------------------------
// io_map - io space address map
//-------------------------------------------------
void vtech_sdloader_device::io_map(address_map &map)
{
map.unmap_value_high();
map(0x37, 0x37).w(FUNC(vtech_sdloader_device::mapper_w));
map(0x38, 0x38).w(FUNC(vtech_sdloader_device::sdcfg_w));
map(0x39, 0x39).rw(FUNC(vtech_sdloader_device::sdio_r), FUNC(vtech_sdloader_device::sdio_w));
map(0x3a, 0x3a).w(FUNC(vtech_sdloader_device::mode_w));
}
//-------------------------------------------------
// rom_region - device-specific ROM region
//-------------------------------------------------
ROM_START( sdloader )
ROM_REGION(0x2800, "software", 0)
ROM_DEFAULT_BIOS("18")
ROM_SYSTEM_BIOS(0, "15", "Version 1.5")
ROMX_LOAD("vzdos15.bin", 0x0000, 0x16c2, CRC(828f7703) SHA1(150c6e5a8f20416c0dab1fa96f68726f415a8b7e), ROM_BIOS(0))
ROM_SYSTEM_BIOS(1, "17", "Version 1.7")
ROMX_LOAD("vzdos17.bin", 0x0000, 0x1783, CRC(7ef7fb1e) SHA1(6278ac675d6c08dca39a5a7f4c72988a178eff8a), ROM_BIOS(1))
ROM_SYSTEM_BIOS(2, "18", "Version 1.8")
ROMX_LOAD("vzdos18.bin", 0x0000, 0x1795, CRC(2b1cec28) SHA1(d4f8fa0c7a70984334be3e5c831017cfc53683b2), ROM_BIOS(2))
ROM_END
const tiny_rom_entry *vtech_sdloader_device::device_rom_region() const
{
return ROM_NAME( sdloader );
}
//-------------------------------------------------
// device_add_mconfig - add device configuration
//-------------------------------------------------
void vtech_sdloader_device::device_add_mconfig(machine_config &config)
{
vtech_memexp_device::device_add_mconfig(config);
SPI_SDCARD(config, m_sdcard);
m_sdcard->spi_miso_callback().set(FUNC(vtech_sdloader_device::spi_miso_w));
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// vtech_sdloader_device - constructor
//-------------------------------------------------
vtech_sdloader_device::vtech_sdloader_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) :
vtech_memexp_device(mconfig, VTECH_SDLOADER, tag, owner, clock),
m_sdcard(*this, "sdcard"),
m_dosbank(*this, "dosbank"),
m_dosview(*this, "dosview"),
m_expbank(*this, "expbank"),
m_spi_clock_state(false),
m_spi_clock_cycles(0),
m_vz300_mode(false)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void vtech_sdloader_device::device_start()
{
vtech_memexp_device::device_start();
// init ram
m_ram = std::make_unique<uint8_t[]>(0x20000);
// configure banks
m_dosbank->configure_entry(0, m_ram.get() + 0x00000);
m_dosbank->configure_entry(1, m_ram.get() + 0x08000);
m_expbank->configure_entry(0, m_ram.get() + 0x10000);
m_expbank->configure_entry(1, m_ram.get() + 0x18000);
// allocate timer for sdcard
m_spi_clock = timer_alloc(FUNC(vtech_sdloader_device::spi_clock), this);
// register for savestates
save_item(NAME(m_spi_clock_state));
save_item(NAME(m_spi_clock_sysclk));
save_item(NAME(m_spi_clock_cycles));
save_item(NAME(m_in_bit));
save_item(NAME(m_in_latch));
save_item(NAME(m_out_latch));
save_item(NAME(m_vz300_mode));
save_pointer(NAME(m_ram), 0x20000);
}
//-------------------------------------------------
// device_reset - device-specific startup
//-------------------------------------------------
void vtech_sdloader_device::device_reset()
{
// startup in vz200 mode
m_vz300_mode = false;
// rom enabled
m_dosview.select(0);
m_spi_clock->adjust(attotime::never);
m_spi_clock_cycles = 0;
m_spi_clock_state = false;
}
//**************************************************************************
// IMPLEMENTATION
//**************************************************************************
TIMER_CALLBACK_MEMBER(vtech_sdloader_device::spi_clock)
{
if (m_spi_clock_cycles > 0)
{
if (m_spi_clock_state)
{
m_in_latch <<= 1;
m_in_latch &= ~0x01;
m_in_latch |= m_in_bit;
m_sdcard->spi_clock_w(1);
m_spi_clock_cycles--;
}
else
{
if (m_spi_clock_cycles == 8)
LOGMASKED(LOG_SPI, "SPI transfer start\n");
m_sdcard->spi_mosi_w(BIT(m_out_latch, 7));
m_sdcard->spi_clock_w(0);
m_out_latch <<= 1;
}
m_spi_clock_state = !m_spi_clock_state;
}
else
{
LOGMASKED(LOG_SPI, "SPI transfer done\n");
m_spi_clock_state = false;
m_spi_clock->adjust(attotime::never);
}
}
void vtech_sdloader_device::spi_miso_w(int state)
{
LOGMASKED(LOG_SPI, "spi_miso_w: %d\n", state);
m_in_bit = state;
}
void vtech_sdloader_device::mapper_w(uint8_t data)
{
// 7654---- not used
// ----3--- led
// -----2-- expansion ram bank
// ------1- dos ram bank
// -------0 dos rom/ram switch
m_dosview.select(BIT(data, 0));
m_dosbank->set_entry(BIT(data, 1));
m_expbank->set_entry(BIT(data, 2));
}
void vtech_sdloader_device::sdcfg_w(uint8_t data)
{
// 765432-- not used
// ------1- sd card cs
// -------0 clock speed
LOGMASKED(LOG_SPI, "sdcfg_w: %02x\n", data);
m_sdcard->spi_ss_w(BIT(data, 1));
m_spi_clock_sysclk = bool(BIT(data, 0));
m_spi_clock_state = false;
m_spi_clock->adjust(attotime::never);
}
uint8_t vtech_sdloader_device::sdio_r()
{
LOGMASKED(LOG_SPI, "sdio_r: %02x\n", m_in_latch);
return m_in_latch;
}
void vtech_sdloader_device::sdio_w(uint8_t data)
{
LOGMASKED(LOG_SPI, "sdio_w: %02x\n", data);
m_out_latch = data;
m_spi_clock_cycles = 8;
// TODO: too fast, also slightly different on vz200
// code only waits for a single NOP before sending the next byte
if (m_spi_clock_sysclk)
m_spi_clock->adjust(attotime::from_hz(17.734470_MHz_XTAL / 1.5), 0, attotime::from_hz(17.734470_MHz_XTAL / 1.5));
else
m_spi_clock->adjust(attotime::from_hz(100_kHz_XTAL), 0, attotime::from_hz(100_kHz_XTAL));
}
void vtech_sdloader_device::mode_w(uint8_t data)
{
LOG("Switching to %s mode\n", BIT(data, 0) ? "VZ-300" : "VZ-200");
m_vz300_mode = bool(BIT(data, 0));
}
uint8_t vtech_sdloader_device::exp_ram_r(offs_t offset)
{
offset += 0x9000;
if (!m_vz300_mode || (m_vz300_mode && offset >= 0xb800))
return reinterpret_cast<uint8_t *>(m_expbank->base())[offset & 0x7fff];
return 0xff;
}
void vtech_sdloader_device::exp_ram_w(offs_t offset, uint8_t data)
{
offset += 0x9000;
if (!m_vz300_mode || (m_vz300_mode && offset >= 0xb800))
reinterpret_cast<uint8_t *>(m_expbank->base())[offset & 0x7fff] = data;
}
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