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/***************************************************************************************
* Genesis Plus
* Sega Activator support
*
* Copyright (C) 2011-2013 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;
uint8 Counter;
} activator[2];
void activator_reset(int index)
{
activator[index].State = 0x40;
activator[index].Counter = 0;
}
INLINE unsigned char activator_read(int index)
{
/* IR sensors 1-16 data (active low) */
uint16 data = ~input.pad[index << 2];
/* D1 = D0 (data is ready) */
uint8 temp = (activator[index].State & 0x01) << 1;
switch (activator[index].Counter)
{
case 0: /* x x x x 0 1 0 0 */
temp |= 0x04;
break;
case 1: /* x x l1 l2 l3 l4 1 1 */
temp |= ((data << 2) & 0x3C);
break;
case 2: /* x x l5 l6 l7 l8 0 0 */
temp |= ((data >> 2) & 0x3C);
break;
case 3: /* x x h1 h2 h3 h4 1 1 */
temp |= ((data >> 6) & 0x3C);
break;
case 4: /* x x h5 h6 h7 h8 0 0 */
temp |= ((data >> 10) & 0x3C);
break;
}
return temp;
}
INLINE void activator_write(int index, unsigned char data, unsigned char mask)
{
/* update bits set as output only */
data = (activator[index].State & ~mask) | (data & mask);
/* TH transitions */
if ((activator[index].State ^ data) & 0x40)
{
/* reset sequence cycle */
activator[index].Counter = 0;
}
else
{
/* D0 transitions */
if ((activator[index].State ^ data) & 0x01)
{
/* increment sequence cycle */
if (activator[index].Counter < 4)
{
activator[index].Counter++;
}
}
}
/* update internal state */
activator[index].State = data;
}
unsigned char activator_1_read(void)
{
return activator_read(0);
}
unsigned char activator_2_read(void)
{
return activator_read(1);
}
void activator_1_write(unsigned char data, unsigned char mask)
{
activator_write(0, data, mask);
}
void activator_2_write(unsigned char data, unsigned char mask)
{
activator_write(1, data, mask);
}
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