mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-12-26 03:01:50 +01:00
112 lines
3.4 KiB
C
112 lines
3.4 KiB
C
/***************************************************************************************
|
|
* Genesis Plus
|
|
* Sega Paddle Control support
|
|
*
|
|
* Copyright (C) 2007-2013 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;
|
|
} paddle[2];
|
|
|
|
void paddle_reset(int index)
|
|
{
|
|
input.analog[index][0] = 128;
|
|
paddle[index>>2].State = 0x40;
|
|
}
|
|
|
|
INLINE unsigned char paddle_read(int port)
|
|
{
|
|
/* FIRE button status (active low) */
|
|
unsigned char temp = ~(input.pad[port] & 0x10);
|
|
|
|
/* Pad index */
|
|
int index = port >> 2;
|
|
|
|
/* Clear low bits */
|
|
temp &= 0x70;
|
|
|
|
/* Japanese model: automatic flip-flop */
|
|
if (region_code < REGION_USA)
|
|
{
|
|
paddle[index].State ^= 0x40;
|
|
}
|
|
|
|
if (paddle[index].State & 0x40)
|
|
{
|
|
/* return higher bits */
|
|
temp |= (input.analog[port][0] >> 4) & 0x0F;
|
|
}
|
|
else
|
|
{
|
|
/* return lower bits */
|
|
temp |= input.analog[port][0] & 0x0F;
|
|
|
|
/* set TR low */
|
|
temp &= ~0x20;
|
|
}
|
|
|
|
return temp;
|
|
}
|
|
|
|
INLINE void paddle_write(int index, unsigned char data, unsigned char mask)
|
|
{
|
|
/* update bits set as output only */
|
|
paddle[index].State = (paddle[index].State & ~mask) | (data & mask);
|
|
}
|
|
|
|
|
|
unsigned char paddle_1_read(void)
|
|
{
|
|
return paddle_read(0);
|
|
}
|
|
|
|
unsigned char paddle_2_read(void)
|
|
{
|
|
return paddle_read(4);
|
|
}
|
|
|
|
void paddle_1_write(unsigned char data, unsigned char mask)
|
|
{
|
|
paddle_write(0, data, mask);
|
|
}
|
|
|
|
void paddle_2_write(unsigned char data, unsigned char mask)
|
|
{
|
|
paddle_write(1, data, mask);
|
|
}
|