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// license:BSD-3-Clause
// copyright-holders:Curt Coder
/**********************************************************************
Fairchild DM9368 7-Segment Decoder/Driver/Latch emulation
**********************************************************************/
#include "emu.h"
#include "dm9368.h"
//#define VERBOSE 1
#include "logmacro.h"
//**************************************************************************
// DEVICE DEFINITION
//**************************************************************************
DEFINE_DEVICE_TYPE(DM9368, dm9368_device, "dm9368", "Fairchild DM9368 7-Segment Decoder")
//**************************************************************************
// MACROS / CONSTANTS
//**************************************************************************
const uint8_t dm9368_device::s_segment_data[16] =
{
0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x67, 0x77, 0x7c, 0x39, 0x5e, 0x79, 0x71
};
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// dm9368_device - constructor
//-------------------------------------------------
dm9368_device::dm9368_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
device_t(mconfig, DM9368, tag, owner, clock),
device_output_interface(mconfig, *this),
m_write_rbo(*this),
m_rbi(1),
m_rbo(1)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void dm9368_device::device_start()
{
// resolve callbacks
m_write_rbo.resolve_safe();
// state saving
save_item(NAME(m_rbi));
save_item(NAME(m_rbo));
}
//-------------------------------------------------
// a_w -
//-------------------------------------------------
void dm9368_device::a_w(uint8_t data)
{
int const a = data & 0x0f;
uint8_t value = 0;
if (!m_rbi && !a)
{
LOG("DM9368 Blanked Rippling Zero\n");
// blank rippling 0
m_rbo = 0;
}
else
{
LOG("DM9368 Output Data: %u = %02x\n", a, s_segment_data[a]);
value = s_segment_data[a];
m_rbo = 1;
}
set_digit_value(value);
m_write_rbo(m_rbo);
}
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