// license:BSD-3-Clause // copyright-holders:Wilbert Pol /*************************************************************************** PC Keyboard connector interface The following basic program can be useful for identifying scancodes: 10 sc%=0:sp%=0 20 sc%=inp(96) 30 if sc%<>sp% then print hex$(sc%):sp%=sc% 40 goto 20 ***************************************************************************/ #include "emu.h" #include "pc_kbdc.h" #define LOG_SIGNALS (1U << 1) //#define VERBOSE (LOG_GENERAL) #include "logmacro.h" //************************************************************************** // GLOBAL VARIABLES //************************************************************************** DEFINE_DEVICE_TYPE(PC_KBDC, pc_kbdc_device, "pc_kbdc", "PC keyboard connector") //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // pc_kbdc_device - constructor //------------------------------------------------- pc_kbdc_device::pc_kbdc_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, PC_KBDC, 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 pc_kbdc_device::set_keyboard(device_pc_kbd_interface *keyboard) { m_keyboard = keyboard; } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void pc_kbdc_device::device_resolve_objects() { device_pc_kbd_interface *const pc_kbd = get_card_device(); if (pc_kbd) pc_kbd->set_pc_kbdc(this); } void pc_kbdc_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; /* initial state of calculated clock line */ m_data_state = -1; /* initial state of calculated data line */ // Initially assume both keyboard and mainboard have released their data and clock lines m_mb_clock_state = 1; m_mb_data_state = 1; m_kb_clock_state = 1; m_kb_data_state = 1; } void pc_kbdc_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) { // We first set our state to prevent possible endless loops m_clock_state = new_clock_state; LOGMASKED(LOG_SIGNALS, "%s Clock: %d\n", fromkb? "<-" : "->", m_clock_state); // Send state to keyboard interface logic on mainboard m_out_clock_cb(m_clock_state); // Send state to keyboard if (m_keyboard) m_keyboard->clock_write(m_clock_state); } } void pc_kbdc_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) { // We first set our state to prevent possible endless loops m_data_state = new_data_state; LOGMASKED(LOG_SIGNALS, "%s Data: %d\n", fromkb? "<-" : "->", m_data_state); // Send state to keyboard interface logic on mainboard m_out_data_cb(m_data_state); // Send state to keyboard if (m_keyboard) m_keyboard->data_write(m_data_state); } } void pc_kbdc_device::clock_write_from_mb(int state) { m_mb_clock_state = state; update_clock_state(false); } void pc_kbdc_device::data_write_from_mb(int state) { m_mb_data_state = state; update_data_state(false); } void pc_kbdc_device::clock_write_from_kb(int state) { m_kb_clock_state = state; update_clock_state(true); } void pc_kbdc_device::data_write_from_kb(int state) { m_kb_data_state = state; update_data_state(true); } //************************************************************************** // DEVICE PC KBD INTERFACE //************************************************************************** //------------------------------------------------- // device_pc_kbd_interface - constructor //------------------------------------------------- device_pc_kbd_interface::device_pc_kbd_interface(const machine_config &mconfig, device_t &device) : device_interface(device, "pckbd") , m_pc_kbdc(nullptr) , m_pc_kbdc_tag(nullptr) { } //------------------------------------------------- // ~device_pc_kbd_interface - destructor //------------------------------------------------- device_pc_kbd_interface::~device_pc_kbd_interface() { } void device_pc_kbd_interface::clock_write(int state) { } void device_pc_kbd_interface::data_write(int state) { } void device_pc_kbd_interface::set_pc_kbdc_device() { if (m_pc_kbdc) m_pc_kbdc->set_keyboard(this); }