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Diffstat (limited to 'src/devices/video/lc7582.cpp')
-rw-r--r-- | src/devices/video/lc7582.cpp | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/src/devices/video/lc7582.cpp b/src/devices/video/lc7582.cpp new file mode 100644 index 00000000000..d062486e827 --- /dev/null +++ b/src/devices/video/lc7582.cpp @@ -0,0 +1,100 @@ +// license:BSD-3-Clause +// copyright-holders:hap +/* + +Sanyo LC7582 LCD Driver + +53 outputs (static), or 106 outputs (1/2 duty) + +TODO: +- OSC pin (input is R/C) +- AD/DSP function + +*/ + +#include "emu.h" +#include "video/lc7582.h" + + +DEFINE_DEVICE_TYPE(LC7582, lc7582_device, "lc7582", "Sanyo LC7582 LCD Driver") + +//------------------------------------------------- +// constructor +//------------------------------------------------- + +lc7582_device::lc7582_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock) : + device_t(mconfig, type, tag, owner, clock), + m_latch{0, 0}, + m_write_segs(*this) +{ } + +lc7582_device::lc7582_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : + lc7582_device(mconfig, LC7582, tag, owner, clock) +{ } + + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void lc7582_device::device_start() +{ + // resolve callbacks + m_write_segs.resolve_safe(); + + // register for savestates + save_item(NAME(m_data)); + save_item(NAME(m_ce)); + save_item(NAME(m_clk)); + save_item(NAME(m_blank)); + save_item(NAME(m_duty)); + save_item(NAME(m_addsp)); + save_item(NAME(m_shift)); + save_item(NAME(m_latch)); +} + + +//------------------------------------------------- +// handlers +//------------------------------------------------- + +void lc7582_device::refresh_output() +{ + m_write_segs(0, m_blank ? 0 : m_latch[0]); + m_write_segs(1, (m_blank || !m_duty) ? 0 : m_latch[1]); +} + +WRITE_LINE_MEMBER(lc7582_device::clk_w) +{ + state = (state) ? 1 : 0; + + // clock shift register + if (state && !m_clk) + m_shift = m_shift >> 1 | u64(m_data) << 55; + + m_clk = state; +} + +WRITE_LINE_MEMBER(lc7582_device::ce_w) +{ + state = (state) ? 1 : 0; + + // latch at falling edge + if (!state && m_ce) + { + // d53: DP (drive mode select, aka duty) + // d54: DQ (AD/DSP function) + // d55: commons + if (!BIT(m_shift, 55)) + { + m_duty = BIT(m_shift, 53); + m_addsp = BIT(m_shift, 54); + } + + m_latch[BIT(m_shift, 55)] = m_shift & u64(0x1f'ffff'ffff'ffff); + refresh_output(); + } + + m_ce = state; +} |