Genesis-Plus-GX/core/input_hw/sportspad.c

135 lines
3.9 KiB
C

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