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/*********************************************************************
kc_keyb.h
*********************************************************************/
#ifndef __KC_KEYB_H__
#define __KC_KEYB_H__
/***************************************************************************
TYPE DEFINITIONS
***************************************************************************/
/* number of pulses that can be stored */
#define KC_TRANSMIT_BUFFER_LENGTH 256
// ======================> kc_keyb_interface
struct kc_keyb_interface
{
devcb_write_line m_keyboard_out_cb;
};
// ======================> kc_keyboard_device
class kc_keyboard_device : public device_t,
public kc_keyb_interface
{
public:
// construction/destruction
kc_keyboard_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
virtual ~kc_keyboard_device();
// optional information overrides
virtual ioport_constructor device_input_ports() const;
protected:
// device-level overrides
virtual void device_start();
virtual void device_reset();
virtual void device_config_complete();
virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
void add_pulse_to_transmit_buffer(int pulse_state, int pulse_number = 1);
void add_bit(int bit);
void transmit_scancode(UINT8 scan_code);
private:
static const device_timer_id TIMER_TRANSMIT_PULSE = 1;
// internal state
emu_timer * m_timer_transmit_pulse;
devcb_resolved_write_line m_keyboard_out_func;
// pulses to transmit
struct
{
UINT8 data[KC_TRANSMIT_BUFFER_LENGTH>>3];
int pulse_sent;
int pulse_count;
} m_transmit_buffer;
};
// device type definition
extern const device_type KC_KEYBOARD;
/***************************************************************************
DEVICE CONFIGURATION MACROS
***************************************************************************/
#define MCFG_KC_KEYBOARD_ADD(_tag,_clock,_config) \
MCFG_DEVICE_ADD(_tag, KC_KEYBOARD, _clock) \
MCFG_DEVICE_CONFIG(_config)
#endif /* __KC_KEYB_H__ */
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