// license:??? // copyright-holders:??? /********************************************************************** Sega Master System "Paddle Control" emulation Copyright MESS Team. Visit http://mamedev.org for licensing and usage restrictions. **********************************************************************/ #include "paddle.h" //************************************************************************** // DEVICE DEFINITIONS //************************************************************************** const device_type SMS_PADDLE = &device_creator; #define PADDLE_INTERVAL attotime::from_hz(XTAL_53_693175MHz/15/256) CUSTOM_INPUT_MEMBER( sms_paddle_device::dir_pins_r ) { UINT8 data = m_paddle_x->read(); if (m_read_state) data >>= 4; // The returned value is inverted due to IP_ACTIVE_LOW mapping. return ~data; } CUSTOM_INPUT_MEMBER( sms_paddle_device::tr_pin_r ) { // The returned value is inverted due to IP_ACTIVE_LOW mapping. return ~m_read_state; } static INPUT_PORTS_START( sms_paddle ) PORT_START("CTRL_PORT") PORT_BIT( 0x0f, IP_ACTIVE_LOW, IPT_SPECIAL ) PORT_CUSTOM_MEMBER(DEVICE_SELF, sms_paddle_device, dir_pins_r, NULL) // Directional pins PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_UNUSED ) // Vcc PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON1 ) // TL PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNUSED ) // TH PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_SPECIAL ) PORT_CUSTOM_MEMBER(DEVICE_SELF, sms_paddle_device, tr_pin_r, NULL) PORT_START("PADDLE_X") // Paddle knob PORT_BIT( 0xff, 0x80, IPT_PADDLE) PORT_SENSITIVITY(40) PORT_KEYDELTA(20) PORT_CENTERDELTA(0) PORT_MINMAX(0,255) INPUT_PORTS_END //------------------------------------------------- // input_ports - device-specific input ports //------------------------------------------------- ioport_constructor sms_paddle_device::device_input_ports() const { return INPUT_PORTS_NAME( sms_paddle ); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // sms_paddle_device - constructor //------------------------------------------------- sms_paddle_device::sms_paddle_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : device_t(mconfig, SMS_PADDLE, "Sega SMS Paddle", tag, owner, clock, "sms_paddle", __FILE__), device_sms_control_port_interface(mconfig, *this), m_paddle_pins(*this, "CTRL_PORT"), m_paddle_x(*this, "PADDLE_X"), m_read_state(0), m_interval(PADDLE_INTERVAL) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void sms_paddle_device::device_start() { m_start_time = machine().time(); save_item(NAME(m_start_time)); save_item(NAME(m_read_state)); } //------------------------------------------------- // sms_peripheral_r - paddle read //------------------------------------------------- UINT8 sms_paddle_device::peripheral_r() { int num_intervals = (machine().time() - m_start_time).as_double() / m_interval.as_double(); m_read_state = num_intervals & 1; return m_paddle_pins->read(); }