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// 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, const char *tag, device_t *owner, const XTAL &clock) :
device_t(mconfig, LC7582, tag, owner, clock),
m_write_segs(*this)
{ }
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void lc7582_device::device_start()
{
// resolve callbacks
m_write_segs.resolve_safe();
// zerofill
m_data = 0;
m_ce = 0;
m_clk = 0;
m_blank = false;
m_duty = 0;
m_addsp = 0;
m_shift = 0;
std::fill_n(m_latch, std::size(m_latch), 0);
// 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;
}
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