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// license:BSD-3-Clause
// copyright-holders:Patrick Mackinlay
/*
* While not physically compatible, the RT PC keyboard protocol is logically
* and electrically identical to the PC/AT. This implementation is copied from
* pc_kbdc and implements the same bi-directional clock and data lines.
*/
#include "emu.h"
#include "kbd_con.h"
#define LOG_GENERAL (1U << 0)
//#define VERBOSE (LOG_GENERAL)
#include "logmacro.h"
DEFINE_DEVICE_TYPE(RTPC_KBD_CON, rtpc_kbd_con_device, "rtpc_kbd_con", "RT PC keyboard connector")
rtpc_kbd_con_device::rtpc_kbd_con_device(machine_config const &mconfig, char const *tag, device_t *owner, const XTAL &clock)
: device_t(mconfig, RTPC_KBD_CON, tag, owner, clock)
, device_single_card_slot_interface<device_rtpc_kbd_interface>(mconfig, *this)
, m_out_clock_cb(*this)
, m_out_data_cb(*this)
, m_clock_state(-1)
, m_data_state(-1)
, m_mb_clock_state(0)
, m_mb_data_state(0)
, m_kb_clock_state(1)
, m_kb_data_state(1)
, m_keyboard(nullptr)
{
}
void rtpc_kbd_con_device::device_config_complete()
{
m_keyboard = get_card_device();
}
void rtpc_kbd_con_device::device_resolve_objects()
{
m_out_clock_cb.resolve_safe();
m_out_data_cb.resolve_safe();
}
void rtpc_kbd_con_device::device_start()
{
save_item(NAME(m_clock_state));
save_item(NAME(m_data_state));
save_item(NAME(m_mb_clock_state));
save_item(NAME(m_mb_data_state));
save_item(NAME(m_kb_clock_state));
save_item(NAME(m_kb_data_state));
m_clock_state = -1;
m_data_state = -1;
m_mb_clock_state = 1;
m_mb_data_state = 1;
m_kb_clock_state = 1;
m_kb_data_state = 1;
}
void rtpc_kbd_con_device::update_clock_state(bool fromkb)
{
int new_clock_state = m_mb_clock_state & m_kb_clock_state;
if (new_clock_state != m_clock_state)
{
m_clock_state = new_clock_state;
LOG("%s clock: %d\n", fromkb? "<-" : "->", m_clock_state);
// send state to host
m_out_clock_cb(m_clock_state);
// send state to keyboard
if (m_keyboard)
m_keyboard->clock_w(m_clock_state);
}
}
void rtpc_kbd_con_device::update_data_state(bool fromkb)
{
int new_data_state = m_mb_data_state & m_kb_data_state;
if (new_data_state != m_data_state)
{
m_data_state = new_data_state;
LOG("%s data: %d\n", fromkb? "<-" : "->", m_data_state);
// send state to host
m_out_data_cb(m_data_state);
// send state to keyboard
if (m_keyboard)
m_keyboard->data_w(m_data_state);
}
}
void rtpc_kbd_con_device::clock_write_from_mb(int state)
{
m_mb_clock_state = state;
update_clock_state(false);
}
void rtpc_kbd_con_device::data_write_from_mb(int state)
{
m_mb_data_state = state;
update_data_state(false);
}
void rtpc_kbd_con_device::clock_write_from_kb(int state)
{
m_kb_clock_state = state;
update_clock_state(true);
}
void rtpc_kbd_con_device::data_write_from_kb(int state)
{
m_kb_data_state = state;
update_data_state(true);
}
device_rtpc_kbd_interface::device_rtpc_kbd_interface(machine_config const &mconfig, device_t &device)
: device_interface(device, "rtpc_kbd_if")
, m_port(dynamic_cast<rtpc_kbd_con_device *>(device.owner()))
{
}
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