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// license:BSD-3-Clause
// copyright-holders:hap
/*
Hughes HLCD 0538(A)/0539(A) LCD Driver
0538: 8 rows, 26 columns
0539: 0 rows, 34 columns
TODO:
- the only difference between 0538/0539 is row pins voltage levels?
*/
#include "emu.h"
#include "video/hlcd0538.h"
DEFINE_DEVICE_TYPE(HLCD0538, hlcd0538_device, "hlcd0538", "Hughes HLCD 0538 LCD Driver")
DEFINE_DEVICE_TYPE(HLCD0539, hlcd0539_device, "hlcd0539", "Hughes HLCD 0539 LCD Driver")
//-------------------------------------------------
// constructor
//-------------------------------------------------
hlcd0538_device::hlcd0538_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock)
: device_t(mconfig, type, tag, owner, clock)
, m_write_cols(*this), m_write_interrupt(*this)
{
}
hlcd0538_device::hlcd0538_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
: hlcd0538_device(mconfig, HLCD0538, tag, owner, clock)
{
}
hlcd0539_device::hlcd0539_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
: hlcd0538_device(mconfig, HLCD0539, tag, owner, clock)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void hlcd0538_device::device_start()
{
// resolve callbacks
m_write_cols.resolve_safe();
m_write_interrupt.resolve_safe();
// zerofill
m_lcd = 0;
m_clk = 0;
m_data = 0;
m_shift = 0;
// register for savestates
save_item(NAME(m_lcd));
save_item(NAME(m_clk));
save_item(NAME(m_data));
save_item(NAME(m_shift));
}
//-------------------------------------------------
// handlers
//-------------------------------------------------
WRITE_LINE_MEMBER(hlcd0538_device::write_clk)
{
state = (state) ? 1 : 0;
// clock in data on falling edge
if (!state && m_clk)
m_shift = (m_shift << 1 | m_data) & u64(0x3ffffffff);
m_clk = state;
}
WRITE_LINE_MEMBER(hlcd0538_device::write_lcd)
{
state = (state) ? 1 : 0;
// transfer to latches on rising edge
if (state && !m_lcd)
{
m_write_cols(0, m_shift, ~u64(0));
m_shift = 0;
}
m_lcd = state;
// interrupt output follows lcd input
m_write_interrupt(state);
}
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