// license:BSD-3-Clause // copyright-holders:hap /* Epson SED1500 series LCD Driver 128 bytes internal RAM. SED1500: 8 commons, 42 segments SED1501: 10 commons, 40 segments SED1502: 16 commons, 34 segments SED1503: 8 commons, 42 segments, needs multiple of 2 chips to function The default input OSC frequency is 32768Hz, the frame output frequency is divided by 64 and by number of commons, eg. 64Hz on a SED1500. TODO: - bus mode (only mode 3 now) - EI pin (master/slave mode) - SYNC pin, used for frame synchronizing if multiple chips are used - SED1503 only has 8 COM pins, the extra 8 outputs are from the slave chip */ #include "emu.h" #include "video/sed1500.h" DEFINE_DEVICE_TYPE(SED1500, sed1500_device, "sed1500", "Epson SED1500 LCD Driver") DEFINE_DEVICE_TYPE(SED1501, sed1501_device, "sed1501", "Epson SED1501 LCD Driver") DEFINE_DEVICE_TYPE(SED1502, sed1502_device, "sed1502", "Epson SED1502 LCD Driver") DEFINE_DEVICE_TYPE(SED1503, sed1503_device, "sed1503", "Epson SED1503 LCD Driver") //------------------------------------------------- // constructor //------------------------------------------------- sed1500_device::sed1500_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock, u8 cmax, u8 smax) : device_t(mconfig, type, tag, owner, clock), m_cmax(cmax), m_smax(smax), m_write_segs(*this) { } sed1500_device::sed1500_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : sed1500_device(mconfig, SED1500, tag, owner, clock, 8, 42) { } sed1501_device::sed1501_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : sed1500_device(mconfig, SED1501, tag, owner, clock, 10, 40) { } sed1502_device::sed1502_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : sed1500_device(mconfig, SED1502, tag, owner, clock, 16, 34) { } sed1503_device::sed1503_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : sed1500_device(mconfig, SED1503, tag, owner, clock, 8+8, 42) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void sed1500_device::device_start() { memset(m_ram, 0, sizeof(m_ram)); // resolve callbacks m_write_segs.resolve_safe(); // timer m_lcd_timer = timer_alloc(); attotime period = attotime::from_hz(clock() / 64); m_lcd_timer->adjust(period, 0, period); // register for savestates save_item(NAME(m_mode)); save_item(NAME(m_cout)); save_item(NAME(m_ram)); } //------------------------------------------------- // handlers //------------------------------------------------- void sed1500_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) { u64 data = 0; for (int i = m_smax-1; i >= 0; i--) data = data << 1 | BIT(m_ram[i | 0x40] << 8 | m_ram[i], m_cout); // transfer segments to output m_write_segs(m_cout, data); m_cout = (m_cout + 1) % m_cmax; } void sed1500_device::write(offs_t offset, u8 data) { offset &= 0x7f; m_ram[offset] = data; // bus mode command: // 0 = 4-bit addr, 4-bit data, combined // 1 = 7-bit addr, 4-bit data, separate // 2 = 7-bit addr, 8-bit data, combined // 3 = 7-bit addr, 8-bit data, separate if ((offset & 0x3f) == 0x3f && ~data & 1) m_mode = data >> 1 & 3; } u8 sed1500_device::read(offs_t offset) { return m_ram[offset & 0x7f]; }