diff options
Diffstat (limited to 'src/mess/machine/kc_keyb.h')
-rw-r--r-- | src/mess/machine/kc_keyb.h | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/src/mess/machine/kc_keyb.h b/src/mess/machine/kc_keyb.h new file mode 100644 index 00000000000..d8c50ec55be --- /dev/null +++ b/src/mess/machine/kc_keyb.h @@ -0,0 +1,76 @@ +/********************************************************************* + + 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__ */ |