diff options
Diffstat (limited to 'src/emu/bus/sms_ctrl/paddle.c')
-rw-r--r-- | src/emu/bus/sms_ctrl/paddle.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/src/emu/bus/sms_ctrl/paddle.c b/src/emu/bus/sms_ctrl/paddle.c new file mode 100644 index 00000000000..7258578d6da --- /dev/null +++ b/src/emu/bus/sms_ctrl/paddle.c @@ -0,0 +1,109 @@ +/********************************************************************** + + 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<sms_paddle_device>; + + +#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, "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_interval(PADDLE_INTERVAL) +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void sms_paddle_device::device_start() +{ + m_start_time = machine().time(); + m_read_state = 0; + + 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(); +} |