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// license:BSD-3-Clause
// copyright-holders:AJR
/******************************************************************************
Video System C7-01 GGA (Graphics Gate Array?)
Skeleton device.
******************************************************************************/
#include "emu.h"
#include "vsystem_gga.h"
//**************************************************************************
// VIDEO SYSTEM GGA DEVICE
//**************************************************************************
// device type definition
DEFINE_DEVICE_TYPE(VSYSTEM_GGA, vsystem_gga_device, "vsystem_gga", "Video System C7-01 GGA")
//-------------------------------------------------
// vsystem_gga_device - constructor
//-------------------------------------------------
vsystem_gga_device::vsystem_gga_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
: device_t(mconfig, VSYSTEM_GGA, tag, owner, clock),
device_video_interface(mconfig, *this, false),
m_write_cb(*this)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void vsystem_gga_device::device_start()
{
m_write_cb.resolve();
m_address_latch = 0;
for (u8 ® : m_regs)
reg = 0;
save_item(NAME(m_address_latch));
save_item(NAME(m_regs));
}
//-------------------------------------------------
// write - register write handler
//-------------------------------------------------
void vsystem_gga_device::write(offs_t offset, u8 data)
{
if (offset & 1)
{
// address write
m_address_latch = data & 0x0f;
}
else
{
// data write
m_regs[m_address_latch] = data;
if (m_write_cb.isnull())
logerror("Setting register $%02x = %02x\n", m_address_latch, data);
else
m_write_cb(m_address_latch, data, 0xff);
}
}
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