// 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, u32 clock) : device_t(mconfig, RTPC_KBD_CON, tag, owner, clock) , device_single_card_slot_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(device.owner())) { }