summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/bus/snes_ctrl/sscope.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/devices/bus/snes_ctrl/sscope.c')
-rw-r--r--src/devices/bus/snes_ctrl/sscope.c185
1 files changed, 185 insertions, 0 deletions
diff --git a/src/devices/bus/snes_ctrl/sscope.c b/src/devices/bus/snes_ctrl/sscope.c
new file mode 100644
index 00000000000..72c81e84328
--- /dev/null
+++ b/src/devices/bus/snes_ctrl/sscope.c
@@ -0,0 +1,185 @@
+// license:BSD-3-Clause
+// copyright-holders:Fabio Priuli
+/**********************************************************************
+
+ Nintendo Super Famicom & SNES SuperScope
+
+ TODO: x,y positions are not correctly latched
+
+**********************************************************************/
+
+#include "sscope.h"
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type SNES_SUPERSCOPE = &device_creator<snes_sscope_device>;
+
+
+static INPUT_PORTS_START( snes_sscope )
+ PORT_START("BUTTONS")
+ PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_BUTTON1 ) PORT_NAME("Superscope Fire")
+ PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_BUTTON2 ) PORT_NAME("Superscope Cursor")
+ PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_BUTTON3 ) PORT_NAME("Superscope Turbo")
+ PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_BUTTON4 ) PORT_NAME("Superscope Pause")
+ PORT_BIT( 0x30, IP_ACTIVE_HIGH, IPT_UNUSED )
+ PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_UNUSED ) // On-screen (handled below in port_poll)
+ PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_UNUSED ) // Noise
+
+ PORT_START("SSX")
+ PORT_BIT( 0xff, 0x80, IPT_LIGHTGUN_X ) PORT_NAME("Superscope X Axis") PORT_CROSSHAIR(X, 1.0, 0.0, 0) PORT_SENSITIVITY(25) PORT_KEYDELTA(15)
+
+ PORT_START("SSY")
+ PORT_BIT( 0xff, 0x80, IPT_LIGHTGUN_Y) PORT_NAME("Superscope Y Axis") PORT_CROSSHAIR(Y, 1.0, 0.0, 0) PORT_SENSITIVITY(25) PORT_KEYDELTA(15)
+INPUT_PORTS_END
+
+
+//-------------------------------------------------
+// input_ports - device-specific input ports
+//-------------------------------------------------
+
+ioport_constructor snes_sscope_device::device_input_ports() const
+{
+ return INPUT_PORTS_NAME( snes_sscope );
+}
+
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// snes_sscope_device - constructor
+//-------------------------------------------------
+
+snes_sscope_device::snes_sscope_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+ device_t(mconfig, SNES_SUPERSCOPE, "Nintendo SNES / SFC SuperScope", tag, owner, clock, "snes_sscope", __FILE__),
+ device_snes_control_port_interface(mconfig, *this),
+ m_buttons(*this, "BUTTONS"),
+ m_xaxis(*this, "SSX"),
+ m_yaxis(*this, "SSY")
+{
+}
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void snes_sscope_device::device_start()
+{
+ save_item(NAME(m_strobe));
+ save_item(NAME(m_idx));
+ save_item(NAME(m_latch));
+ save_item(NAME(m_x));
+ save_item(NAME(m_y));
+ save_item(NAME(m_turbo_lock));
+ save_item(NAME(m_pause_lock));
+ save_item(NAME(m_fire_lock));
+}
+
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void snes_sscope_device::device_reset()
+{
+ m_strobe = 0;
+ m_idx = 0;
+ m_latch = 0;
+ m_x = 0;
+ m_y = 0;
+ m_turbo_lock = 0;
+ m_pause_lock = 0;
+ m_fire_lock = 0;
+}
+
+
+//-------------------------------------------------
+// poll
+//-------------------------------------------------
+
+void snes_sscope_device::port_poll()
+{
+ // first read input bits
+ UINT8 input = m_buttons->read();
+ m_x = m_xaxis->read();
+ m_y = m_yaxis->read();
+ m_idx = 0;
+
+ // then start elaborating input bits
+ // 1. only keep old turbo value
+ m_latch &= 0x04;
+
+ // 2. set onscreen/offscreen
+ if (!m_port->m_onscreen_cb.isnull())
+ m_latch |= (m_port->m_onscreen_cb(m_x, m_y) ? 0x00 : 0x40);
+
+ // 3. pause is a button that is always edge sensitive
+ if (BIT(input, 3) && !m_pause_lock)
+ {
+ m_latch |= 0x08;
+ m_pause_lock = 1;
+ }
+ else if (!BIT(input, 3))
+ m_pause_lock = 0;
+
+ // 4. turbo is a switch; toggle is edge sensitive
+ if (BIT(input, 2) && !m_turbo_lock)
+ {
+ m_latch ^= 0x04;
+ m_turbo_lock = 1;
+ }
+ else if (!BIT(input, 2))
+ m_turbo_lock = 0;
+
+ // 5. cursor is a button that is always level sensitive
+ m_latch |= BIT(input, 1);
+
+ // 6. fire is a button with two behaviors: if turbo is active, trigger is level sensitive;
+ // otherwise it is edge sensitive
+ if (BIT(input, 0) && (BIT(m_latch, 2) || !m_fire_lock))
+ {
+ m_latch |= 0x01;
+ m_fire_lock = 1;
+ }
+ else if (!BIT(input, 0))
+ m_fire_lock = 0;
+
+ // If we have pressed fire or cursor and we are on-screen and SuperScope is in Port2, then latch video signal.
+ // Notice that this only works in Port2 because its IOBit pin is connected to bit7 of the IO Port, while Port1
+ // has IOBit pin connected to bit6 of the IO Port, and the latter is not detected by the H/V Counters. In other
+ // words, you can connect SuperScope to Port1, but there is no way SNES could detect its on-screen position
+ if ((m_latch & 0x03) && !(m_latch & 0x40) && !m_port->m_gunlatch_cb.isnull())
+ m_port->m_gunlatch_cb(m_x, m_y);
+}
+
+//-------------------------------------------------
+// read
+//-------------------------------------------------
+
+UINT8 snes_sscope_device::read_pin4()
+{
+ UINT8 res = 0;
+
+ if (m_idx >= 8) // bits 8-15 = ID = all 1s; bits >= 16 all 1s
+ res |= 0x01;
+ else
+ res |= BIT(m_latch, m_idx++);
+
+ return res;
+}
+
+//-------------------------------------------------
+// write
+//-------------------------------------------------
+
+void snes_sscope_device::write_strobe(UINT8 data)
+{
+ int old = m_strobe;
+ m_strobe = data & 0x01;
+
+ if (m_strobe < old) // 1 -> 0 transition
+ port_poll();
+}