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
4.0 KiB
C
135 lines
4.0 KiB
C
/***************************************************************************************
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* Genesis Plus
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* Sega Activator support
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*
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* Copyright (C) 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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} activator[2];
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void activator_reset(int index)
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{
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activator[index].State = 0x40;
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activator[index].Counter = 0;
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}
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INLINE unsigned char activator_read(int port)
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{
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/* IR sensors 1-16 data (active low) */
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uint16 data = ~input.pad[port << 2];
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/* D1 = D0 (data is ready) */
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uint8 temp = (activator[port].State & 0x01) << 1;
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switch (activator[port].Counter)
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{
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case 0: /* x x x x 0 1 0 0 */
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temp |= 0x04;
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break;
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case 1: /* x x l1 l2 l3 l4 1 1 */
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temp |= ((data << 2) & 0x3C);
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break;
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case 2: /* x x l5 l6 l7 l8 0 0 */
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temp |= ((data >> 2) & 0x3C);
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break;
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case 3: /* x x h1 h2 h3 h4 1 1 */
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temp |= ((data >> 6) & 0x3C);
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break;
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case 4: /* x x h5 h6 h7 h8 0 0 */
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temp |= ((data >> 10) & 0x3C);
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break;
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}
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return temp;
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}
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INLINE void activator_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 = (activator[index].State & ~mask) | (data & mask);
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/* TH transitions */
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if ((activator[index].State ^ data) & 0x40)
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{
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/* reset sequence cycle */
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activator[index].Counter = 0;
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}
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else
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{
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/* D0 transitions */
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if ((activator[index].State ^ data) & 0x01)
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{
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/* increment sequence cycle */
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if (activator[index].Counter < 4)
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{
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activator[index].Counter++;
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}
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}
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}
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/* update internal state */
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activator[index].State = data;
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}
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unsigned char activator_1_read(void)
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{
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return activator_read(0);
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}
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unsigned char activator_2_read(void)
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{
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return activator_read(1);
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}
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void activator_1_write(unsigned char data, unsigned char mask)
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{
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activator_write(0, data, mask);
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}
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void activator_2_write(unsigned char data, unsigned char mask)
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{
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activator_write(1, data, mask);
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}
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