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// license:BSD-3-Clause
// copyright-holders:Sandro Ronco
/***************************************************************************
SED1520 LCD controller
TODO:
- busy flag
***************************************************************************/
#include "emu.h"
#include "video/sed1520.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
const device_type SED1520 = &device_creator<sed1520_device>;
//**************************************************************************
// live device
//**************************************************************************
//-------------------------------------------------
// sed1520_device - constructor
//-------------------------------------------------
sed1520_device::sed1520_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
device_t(mconfig, SED1520, "SED1520", tag, owner, clock, "sed1520", __FILE__),
m_screen_update_func(NULL)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void sed1520_device::device_start()
{
// state saving
save_item(NAME(m_lcd_on));
save_item(NAME(m_busy));
save_item(NAME(m_page));
save_item(NAME(m_column));
save_item(NAME(m_old_column));
save_item(NAME(m_start_line));
save_item(NAME(m_adc));
save_item(NAME(m_static_drive));
save_item(NAME(m_modify_write));
save_item(NAME(m_vram));
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void sed1520_device::device_reset()
{
m_lcd_on = 0;
m_busy = 0;
m_page = 3;
m_column = 0;
m_old_column = 0;
m_start_line = 0;
m_adc = 1;
m_static_drive = 0;
m_modify_write = false;
memset(m_vram, 0x00, sizeof(m_vram));
}
//**************************************************************************
// device interface
//**************************************************************************
UINT32 sed1520_device::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
if (m_lcd_on)
{
if (m_screen_update_func)
m_screen_update_func(*this, bitmap, cliprect, m_vram, m_start_line, m_adc);
}
else if (m_static_drive)
return UPDATE_HAS_NOT_CHANGED;
else
bitmap.fill(0, cliprect);
return 0;
}
READ8_MEMBER(sed1520_device::read)
{
if (offset & 0x01)
return data_read(space, 0);
else
return status_read(space, 0);
}
WRITE8_MEMBER(sed1520_device::write)
{
if (offset & 0x01)
data_write(space, 0, data);
else
control_write(space, 0, data);
}
WRITE8_MEMBER(sed1520_device::control_write)
{
if((data & 0xfe) == 0xae) // display on/off
m_lcd_on = data & 0x01;
else if((data & 0xe0) == 0xc0) // set start line
m_start_line = data & 0x1f;
else if((data & 0xfc) == 0xb8) // set page address
m_page = data & 0x03;
else if((data & 0x80) == 0x00) // set column address
m_column = data % 80;
else if((data & 0xfe) == 0xa0) // select ADC
m_adc = data & 0x01;
else if((data & 0xfe) == 0xa4) // static drive on/off
m_static_drive = data & 0x01;
else if((data & 0xfe) == 0xa8) // select duty
;
else if(data == 0xe0) // read-modify-write on
{
m_modify_write = true;
m_old_column = m_column;
}
else if(data == 0xee) // read-modify-write off
{
m_modify_write = false;
m_column = m_old_column;
}
else if(data == 0xe2) // reset
{
m_start_line = m_column = 0;
m_page = 3;
}
else
logerror("%s: invalid SED1520 command: %x\n", tag(), data);
}
READ8_MEMBER(sed1520_device::status_read)
{
UINT8 data = (m_busy << 7) | (m_adc << 6) | (m_lcd_on << 5);
return data;
}
WRITE8_MEMBER(sed1520_device::data_write)
{
m_vram[(m_page * 80 + m_column) % sizeof(m_vram)] = data;
m_column = (m_column + 1) % 80;
}
READ8_MEMBER(sed1520_device::data_read)
{
UINT8 data = m_vram[(m_page * 80 + m_column) % sizeof(m_vram)];
if (!m_modify_write)
m_column = (m_column + 1) % 80;
return data;
}
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