/********************************************************************** HD61830 LCD Timing Controller emulation Copyright MESS Team. Visit http://mamedev.org for licensing and usage restrictions. **********************************************************************/ #include "emu.h" #include "hd61830.h" //************************************************************************** // MACROS / CONSTANTS //************************************************************************** #define LOG 0 enum { INSTRUCTION_MODE_CONTROL = 0, INSTRUCTION_CHARACTER_PITCH, INSTRUCTION_NUMBER_OF_CHARACTERS, INSTRUCTION_NUMBER_OF_TIME_DIVISIONS, INSTRUCTION_CURSOR_POSITION, INSTRUCTION_DISPLAY_START_LOW = 8, INSTRUCTION_DISPLAY_START_HIGH, INSTRUCTION_CURSOR_ADDRESS_LOW, INSTRUCTION_CURSOR_ADDRESS_HIGH, INSTRUCTION_DISPLAY_DATA_WRITE, INSTRUCTION_DISPLAY_DATA_READ, INSTRUCTION_CLEAR_BIT, INSTRUCTION_SET_BIT }; static const int CYCLES[] = { 4, 4, 4, 4, 4, -1, -1, -1, 4, 4, 4, 4, 6, 6, 36, 36 }; const int MODE_EXTERNAL_CG = 0x01; const int MODE_GRAPHIC = 0x02; const int MODE_CURSOR = 0x04; const int MODE_BLINK = 0x08; const int MODE_MASTER = 0x10; const int MODE_DISPLAY_ON = 0x20; //************************************************************************** // GLOBAL VARIABLES //************************************************************************** // devices const device_type HD61830 = hd61830_device_config::static_alloc_device_config; // default address map static ADDRESS_MAP_START( hd61830, AS_0, 8 ) AM_RANGE(0x0000, 0xffff) AM_RAM ADDRESS_MAP_END // internal character generator ROM ROM_START( hd61830 ) ROM_REGION( 0x5c0, "hd61830", ROMREGION_LOADBYNAME ) // internal 7360-bit chargen ROM ROM_LOAD( "hd61830.bin", 0x000, 0x5c0, BAD_DUMP CRC(06a934da) SHA1(bf3f074db5dc92e6f530cb18d6c013563099a87d) ) // typed in from manual ROM_END //************************************************************************** // DEVICE CONFIGURATION //************************************************************************** //------------------------------------------------- // hd61830_device_config - constructor //------------------------------------------------- hd61830_device_config::hd61830_device_config(const machine_config &mconfig, const char *tag, const device_config *owner, UINT32 clock) : device_config(mconfig, static_alloc_device_config, "Hitachi HD61830", tag, owner, clock), device_config_memory_interface(mconfig, *this), m_space_config("videoram", ENDIANNESS_LITTLE, 8, 16, 0, NULL, *ADDRESS_MAP_NAME(hd61830)) { m_shortname = "hd61830"; } //------------------------------------------------- // static_alloc_device_config - allocate a new // configuration object //------------------------------------------------- device_config *hd61830_device_config::static_alloc_device_config(const machine_config &mconfig, const char *tag, const device_config *owner, UINT32 clock) { return global_alloc(hd61830_device_config(mconfig, tag, owner, clock)); } //------------------------------------------------- // alloc_device - allocate a new device object //------------------------------------------------- device_t *hd61830_device_config::alloc_device(running_machine &machine) const { return auto_alloc(&machine, hd61830_device(machine, *this)); } //------------------------------------------------- // memory_space_config - return a description of // any address spaces owned by this device //------------------------------------------------- const address_space_config *hd61830_device_config::memory_space_config(address_spacenum spacenum) const { return (spacenum == AS_0) ? &m_space_config : NULL; } //------------------------------------------------- // rom_region - device-specific ROM region //------------------------------------------------- const rom_entry *hd61830_device_config::rom_region() const { return ROM_NAME(hd61830); } //------------------------------------------------- // device_config_complete - perform any // operations now that the configuration is // complete //------------------------------------------------- void hd61830_device_config::device_config_complete() { // inherit a copy of the static data const hd61830_interface *intf = reinterpret_cast(static_config()); if (intf != NULL) *static_cast(this) = *intf; // or initialize to defaults if none provided else { memset(&m_in_rd_func, 0, sizeof(m_in_rd_func)); } } //************************************************************************** // INLINE HELPERS //************************************************************************** //------------------------------------------------- // readbyte - read a byte at the given address //------------------------------------------------- inline UINT8 hd61830_device::readbyte(offs_t address) { return space()->read_byte(address); } //------------------------------------------------- // writebyte - write a byte at the given address //------------------------------------------------- inline void hd61830_device::writebyte(offs_t address, UINT8 data) { space()->write_byte(address, data); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // hd61830_device - constructor //------------------------------------------------- hd61830_device::hd61830_device(running_machine &_machine, const hd61830_device_config &config) : device_t(_machine, config), device_memory_interface(_machine, config, *this), m_bf(false), m_blink(0), m_config(config) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void hd61830_device::device_start() { // allocate timers m_busy_timer = timer_alloc(); // resolve callbacks devcb_resolve_read8(&m_in_rd_func, &m_config.m_in_rd_func, this); m_screen = machine->device(m_config.screen_tag); // register for state saving save_item(NAME(m_bf)); save_item(NAME(m_ir)); save_item(NAME(m_mcr)); save_item(NAME(m_dor)); save_item(NAME(m_cac)); save_item(NAME(m_dsa)); save_item(NAME(m_vp)); save_item(NAME(m_hp)); save_item(NAME(m_hn)); save_item(NAME(m_nx)); save_item(NAME(m_cp)); save_item(NAME(m_blink)); save_item(NAME(m_cursor)); } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void hd61830_device::device_reset() { // display off, slave mode m_mcr &= ~(MODE_MASTER | MODE_DISPLAY_ON); // default horizontal pitch m_hp = 6; } //------------------------------------------------- // device_timer - handler timer events //------------------------------------------------- void hd61830_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) { // clear busy flag m_bf = false; } /*------------------------------------------------- set_busy_flag - set busy flag and arm timer to clear it later -------------------------------------------------*/ void hd61830_device::set_busy_flag() { // set busy flag m_bf = true; // adjust busy timer m_busy_timer->adjust(attotime::from_usec(CYCLES[m_ir])); } //------------------------------------------------- // status_r - status register read //------------------------------------------------- READ8_MEMBER( hd61830_device::status_r ) { if (LOG) logerror("HD61830 '%s' Status Read: %s\n", tag(), m_bf ? "busy" : "ready"); return m_bf ? 0x80 : 0; } //------------------------------------------------- // control_w - instruction register write //------------------------------------------------- WRITE8_MEMBER( hd61830_device::control_w ) { m_ir = data; } //------------------------------------------------- // data_r - data register read //------------------------------------------------- READ8_MEMBER( hd61830_device::data_r ) { UINT8 data = m_dor; if (LOG) logerror("HD61830 '%s' Display Data Read %02x\n", tag(), m_dor); m_dor = readbyte(m_cac); m_cac++; return data; } //------------------------------------------------- // data_w - data register write //------------------------------------------------- WRITE8_MEMBER( hd61830_device::data_w ) { if (m_bf) { logerror("HD61830 '%s' Ignoring data write %02x due to business\n", tag(), data); return; } switch (m_ir) { case INSTRUCTION_MODE_CONTROL: m_mcr = data; if (LOG) { logerror("HD61830 '%s' %s CG\n", tag(), (data & MODE_EXTERNAL_CG) ? "External" : "Internal"); logerror("HD61830 '%s' %s Display Mode\n", tag(), (data & MODE_GRAPHIC) ? "Graphic" : "Character"); logerror("HD61830 '%s' %s Mode\n", tag(), (data & MODE_MASTER) ? "Master" : "Slave"); logerror("HD61830 '%s' Cursor %s\n", tag(), (data & MODE_CURSOR) ? "On" : "Off"); logerror("HD61830 '%s' Blink %s\n", tag(), (data & MODE_BLINK) ? "On" : "Off"); logerror("HD61830 '%s' Display %s\n", tag(), (data & MODE_DISPLAY_ON) ? "On" : "Off"); } break; case INSTRUCTION_CHARACTER_PITCH: m_hp = (data & 0x07) + 1; m_vp = (data >> 4) + 1; if (LOG) logerror("HD61830 '%s' Horizontal Character Pitch: %u\n", tag(), m_hp); if (LOG) logerror("HD61830 '%s' Vertical Character Pitch: %u\n", tag(), m_vp); break; case INSTRUCTION_NUMBER_OF_CHARACTERS: m_hn = (data & 0x7f) + 1; if (LOG) logerror("HD61830 '%s' Number of Characters: %u\n", tag(), m_hn); break; case INSTRUCTION_NUMBER_OF_TIME_DIVISIONS: m_nx = (data & 0x7f) + 1; if (LOG) logerror("HD61830 '%s' Number of Time Divisions: %u\n", tag(), m_nx); break; case INSTRUCTION_CURSOR_POSITION: m_cp = (data & 0x7f) + 1; if (LOG) logerror("HD61830 '%s' Cursor Position: %u\n", tag(), m_cp); break; case INSTRUCTION_DISPLAY_START_LOW: m_dsa = (m_dsa & 0xff00) | data; if (LOG) logerror("HD61830 '%s' Display Start Address Low %04x\n", tag(), m_dsa); break; case INSTRUCTION_DISPLAY_START_HIGH: m_dsa = (data << 8) | (m_dsa & 0xff); if (LOG) logerror("HD61830 '%s' Display Start Address High %04x\n", tag(), m_dsa); break; case INSTRUCTION_CURSOR_ADDRESS_LOW: if (BIT(m_cac, 7) && !BIT(data, 7)) { m_cac = (((m_cac >> 8) + 1) << 8) | data; } else { m_cac = (m_cac & 0xff00) | data; } if (LOG) logerror("HD61830 '%s' Cursor Address Low %02x: %04x\n", tag(), data, m_cac); break; case INSTRUCTION_CURSOR_ADDRESS_HIGH: m_cac = (data << 8) | (m_cac & 0xff); if (LOG) logerror("HD61830 '%s' Cursor Address High %02x: %04x\n", tag(), data, m_cac); break; case INSTRUCTION_DISPLAY_DATA_WRITE: writebyte(m_cac, data); if (LOG) logerror("HD61830 '%s' Display Data Write %02x -> %04x row %u col %u\n", tag(), data, m_cac, m_cac / 40, m_cac % 40); m_cac++; break; case INSTRUCTION_CLEAR_BIT: { int bit = data & 0x07; UINT8 md = readbyte(m_cac); md &= ~(1 << bit); if (LOG) logerror("HD61830 '%s' Clear Bit %u at %04x\n", tag(), bit + 1, m_cac); writebyte(m_cac, md); m_cac++; } break; case INSTRUCTION_SET_BIT: { int bit = data & 0x07; UINT8 md = readbyte(m_cac); md |= 1 << bit; if (LOG) logerror("HD61830 '%s' Set Bit %u at %04x\n", tag(), bit + 1, m_cac); writebyte(m_cac, md); m_cac++; } break; default: logerror("HD61830 '%s' Illegal Instruction %02x!\n", tag(), m_ir); return; } // burn cycles set_busy_flag(); } //------------------------------------------------- // draw_scanline - draw one graphics scanline //------------------------------------------------- void hd61830_device::draw_scanline(bitmap_t *bitmap, const rectangle *cliprect, int y, UINT16 ra) { for (int sx = 0; sx < m_hn; sx++) { UINT8 data = readbyte(ra++); for (int x = 0; x < m_hp; x++) { *BITMAP_ADDR16(bitmap, y, (sx * m_hp) + x) = BIT(data, x); } } } //------------------------------------------------- // update_graphics - draw graphics mode screen //------------------------------------------------- void hd61830_device::update_graphics(bitmap_t *bitmap, const rectangle *cliprect) { for (int y = 0; y < m_nx; y++) { UINT16 rac1 = m_dsa + (y * m_hn); UINT16 rac2 = rac1 + (m_nx * m_hn); /* draw upper half scanline */ draw_scanline(bitmap, cliprect, y, rac1); /* draw lower half scanline */ draw_scanline(bitmap, cliprect, y + m_nx, rac2); } } //------------------------------------------------- // draw_char - draw a char //------------------------------------------------- void hd61830_device::draw_char(bitmap_t *bitmap, const rectangle *cliprect, UINT16 ma, int x, int y, UINT8 md) { for (int cl = 0; cl < m_vp; cl++) { for (int cr = 0; cr < m_hp; cr++) { int sy = y * m_vp + cl; int sx = x * m_hp + cr; UINT8 data = 0; if (m_mcr & MODE_EXTERNAL_CG) { data = devcb_call_read8(&m_in_rd_func, (cl << 12) | md); } else { UINT16 addr = 0; if (md >= 0x20 && md < 0x80 && cl < 7) { // 5x7 characters 0x20..0x7f addr = (md - 0x20) * 7 + cl; } else if (md >= 0xa0 && md < 0xe0 && cl < 7) { // 5x7 characters 0xa0..0xdf addr = 96*7 + (md - 0xa0) * 7 + cl; } else if (md >= 0xe0 && cl < 11) { // 5x11 characters 0xe0..0xff addr = 160*7 + (md - 0xe0) * 11 + cl; } data = subregion("hd61830")->u8(addr); } int cursor = m_mcr & MODE_CURSOR; int blink = m_mcr & MODE_BLINK; // cursor off int pixel = BIT(data, cr); if (blink && (ma == m_cac)) { // cursor off, character blink if (!cursor) pixel = m_cursor ? pixel : 0; // cursor blink if (cursor && (cl == m_cp)) pixel = m_cursor ? 1 : 0; } else { // cursor on if (cursor && (cl == m_cp)) pixel = m_cursor ? 1 : 0; } if (sy < m_screen->height() && sx < m_screen->width()) *BITMAP_ADDR16(bitmap, sy, sx) = pixel; } } } //------------------------------------------------- // update_text - draw text mode screen //------------------------------------------------- void hd61830_device::update_text(bitmap_t *bitmap, const rectangle *cliprect) { for (int y = 0; y < (m_nx / m_vp); y++) { for (int x = 0; x < m_hn; x++) { UINT16 ma = y * m_hn + x; UINT8 md = readbyte(ma); draw_char(bitmap, cliprect, ma, x, y, md); } } } //------------------------------------------------- // update_screen - update screen //------------------------------------------------- void hd61830_device::update_screen(bitmap_t *bitmap, const rectangle *cliprect) { if (m_mcr & MODE_DISPLAY_ON) { if (m_mcr & MODE_GRAPHIC) { update_graphics(bitmap, cliprect); } else { update_text(bitmap, cliprect); } } else { bitmap_fill(bitmap, cliprect, 0); } m_blink++; if (m_blink == 0x20) { m_blink = 0; m_cursor = !m_cursor; } }