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[Core/IO] improved control pad emulation (verified on real hardware)

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This commit is contained in:
EkeEke 2015-10-17 19:24:01 +02:00
parent 406ee5e6bc
commit 1cf6882bb2
2 changed files with 26 additions and 24 deletions
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48
core/input_hw/gamepad.c
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@ -3,7 +3,7 @@
* 2-Buttons, 3-Buttons & 6-Buttons controller support
* Additional support for J-Cart, 4-Way Play & Master Tap adapters
*
* Copyright (C) 2007-2014 Eke-Eke (Genesis Plus GX)
* Copyright (C) 2007-2015 Eke-Eke (Genesis Plus GX)
*
* Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met:
@ -83,15 +83,16 @@ void gamepad_refresh(int port)
INLINE unsigned char gamepad_read(int port)
{
/* bit 7 is latched, returns current TH state */
unsigned int data = (gamepad[port].State & 0x40) | 0x3F;
/* D7 is not connected, D6 returns TH input state */
unsigned int data = gamepad[port].State | 0x3F;
/* pad value */
unsigned int val = input.pad[port];
/* get current step (TH state) */
unsigned int step = gamepad[port].Counter | ((data >> 6) & 1);
/* get current TH input pulse counter */
unsigned int step = gamepad[port].Counter | (data >> 6);
/* D-PAD & buttons status are returned on D5-D0 (active low) */
switch (step)
{
case 1: /*** First High ***/
@ -103,8 +104,8 @@ INLINE unsigned char gamepad_read(int port)
break;
}
case 0: /*** First low ***/
case 2: /*** Second low ***/
case 0: /*** First Low ***/
case 2: /*** Second Low ***/
{
/* TH = 0 : ?0SA00DU */
data &= ~(val & 0x03);
@ -113,7 +114,7 @@ INLINE unsigned char gamepad_read(int port)
break;
}
/* 6buttons specific (taken from gen-hw.txt) */
/* 6-buttons specific (taken from gen-hw.txt) */
/* A 6-button gamepad allows the extra buttons to be read based on how */
/* many times TH is switched from 1 to 0 (and not 0 to 1). Observe the */
/* following sequence */
@ -121,13 +122,13 @@ INLINE unsigned char gamepad_read(int port)
TH = 1 : ?1CBRLDU 3-button pad return value
TH = 0 : ?0SA00DU 3-button pad return value
TH = 1 : ?1CBRLDU 3-button pad return value
TH = 0 : ?0SA0000 D3-0 are forced to '0'
TH = 0 : ?0SA0000 D3-D0 are forced to '0'
TH = 1 : ?1CBMXYZ Extra buttons returned in D3-0
TH = 0 : ?0SA1111 D3-0 are forced to '1'
TH = 0 : ?0SA1111 D3-D0 are forced to '1'
*/
case 4: /*** Third Low ***/
{
/* TH = 0 : ?0SA0000 D3-0 are forced to '0'*/
/* TH = 0 : ?0SA0000 D3-D0 forced to '0' */
data &= ~((val >> 2) & 0x30);
data &= ~0x0F;
break;
@ -135,14 +136,14 @@ INLINE unsigned char gamepad_read(int port)
case 6: /*** Fourth Low ***/
{
/* TH = 0 : ?0SA1111 D3-0 are forced to '1'*/
/* TH = 0 : ?0SA1111 D3-D0 forced to '1' */
data &= ~((val >> 2) & 0x30);
break;
}
case 7: /*** Fourth High ***/
{
/* TH = 1 : ?1CBMXYZ Extra buttons returned in D3-0*/
/* TH = 1 : ?1CBMXYZ Extra buttons returned in D3-D0 */
data &= ~(val & 0x30);
data &= ~((val >> 8) & 0x0F);
break;
@ -154,20 +155,21 @@ INLINE unsigned char gamepad_read(int port)
INLINE void gamepad_write(int port, unsigned char data, unsigned char mask)
{
/* update bits set as output only */
data = (gamepad[port].State & ~mask) | (data & mask);
/* retrieve TH input state (pulled high when not configured as output by I/O controller) */
data = ((data & mask) | ~mask) & 0x40;
/* 6-Buttons controller specific */
if (input.dev[port] == DEVICE_PAD6B)
{
/* TH=0 to TH=1 transition */
if (!(gamepad[port].State & 0x40) && (data & 0x40))
if (!gamepad[port].State && data)
{
gamepad[port].Counter = (gamepad[port].Counter + 2) & 6;
gamepad[port].Timeout = 0;
}
}
/* update internal state */
/* update TH input state */
gamepad[port].State = data;
}
@ -206,7 +208,7 @@ unsigned char wayplay_1_read(void)
if (latch & 0x04)
{
/* 4-WayPlay detection : xxxxx00 */
return 0x7c;
return 0x7C;
}
/* TR & TL on port B select controller # (0-3) */
@ -237,15 +239,15 @@ void wayplay_2_write(unsigned char data, unsigned char mask)
unsigned int jcart_read(unsigned int address)
{
/* TH2 output read is fixed to zero (fixes Micro Machines 2) */
return ((gamepad_read(5) & 0x7F) | ((gamepad_read(6) & 0x3F) << 8));
/* D6 returns TH state, D14 is fixed low (fixes Micro Machines 2) */
return (gamepad_read(5) | ((gamepad_read(6) & 0x3F) << 8));
}
void jcart_write(unsigned int address, unsigned int data)
{
gamepad_write(5, (data & 1) << 6, 0x40);
gamepad_write(6, (data & 1) << 6, 0x40);
return;
data = (data & 0x01) << 6;
gamepad_write(5, data, 0x40);
gamepad_write(6, data, 0x40);
}

2
core/input_hw/gamepad.h
View File

@ -3,7 +3,7 @@
* 2-Buttons, 3-Buttons & 6-Buttons controller support
* Additional support for J-Cart, 4-Way Play & Master Tap adapters
*
* Copyright (C) 2007-2014 Eke-Eke (Genesis Plus GX)
* Copyright (C) 2007-2015 Eke-Eke (Genesis Plus GX)
*
* Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met: