mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
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cab4ecba99
* added an option to set VDP mode (PAL/NTSC) independently from console region. * added an option to select console master clock frequency (PAL/NTSC/AUTO): emulation now run at selected frequency when VSYNC is disabled. * added an option to force VSYNC disabled. * improved screen scaling. [Core] * moved INLINE definition to macros.h * removed unused typedef from osd_cpu.h * cleanup include files
135 lines
3.9 KiB
C
135 lines
3.9 KiB
C
/***************************************************************************************
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* Genesis Plus
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* Sega Sports Pad support
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*
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* Copyright (C) 2007-2011 Eke-Eke (Genesis Plus GX)
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*
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* Redistribution and use of this code or any derivative works are permitted
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* provided that the following conditions are met:
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*
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* - Redistributions may not be sold, nor may they be used in a commercial
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* product or activity.
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*
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* - Redistributions that are modified from the original source must include the
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* complete source code, including the source code for all components used by a
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* binary built from the modified sources. However, as a special exception, the
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* source code distributed need not include anything that is normally distributed
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* (in either source or binary form) with the major components (compiler, kernel,
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* and so on) of the operating system on which the executable runs, unless that
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* component itself accompanies the executable.
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*
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* - Redistributions must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************************/
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#include "shared.h"
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static struct
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{
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uint8 State;
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uint8 Counter;
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} sportspad[2];
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void sportspad_reset(int index)
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{
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input.analog[index << 2][0] = 128;
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input.analog[index << 2][1] = 128;
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sportspad[index].State = 0x40;
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sportspad[index].Counter = 0;
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}
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INLINE unsigned char sportspad_read(int port)
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{
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/* Buttons 1(B) & 2(C) status (active low) */
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unsigned char temp = ~(input.pad[port] & 0x30);
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/* Pad index */
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int index = port >> 2;
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/* Clear low bits */
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temp &= 0x70;
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/* Detect current state */
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switch (sportspad[index].Counter & 3)
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{
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case 1:
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{
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/* X position high bits */
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temp |= (input.analog[port][0] >> 4) & 0x0F;
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break;
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}
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case 2:
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{
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/* X position low bits */
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temp |= input.analog[port][0] & 0x0F;
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break;
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}
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case 3:
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{
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/* Y position high bits */
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temp |= (input.analog[port][1] >> 4) & 0x0F;
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break;
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}
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default:
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{
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/* Y position low bits */
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temp |= input.analog[port][1] & 0x0F;
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break;
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}
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}
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return temp;
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}
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INLINE void sportspad_write(int index, unsigned char data, unsigned char mask)
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{
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/* update bits set as output only */
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data = (sportspad[index].State & ~mask) | (data & mask);
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/* check TH transitions */
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if ((data ^ sportspad[index].State) & 0x40)
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{
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sportspad[index].Counter++;
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}
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/* update internal state */
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sportspad[index].State = data;
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}
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unsigned char sportspad_1_read(void)
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{
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return sportspad_read(0);
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}
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unsigned char sportspad_2_read(void)
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{
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return sportspad_read(4);
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}
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void sportspad_1_write(unsigned char data, unsigned char mask)
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{
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sportspad_write(0, data, mask);
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}
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void sportspad_2_write(unsigned char data, unsigned char mask)
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{
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sportspad_write(1, data, mask);
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}
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