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/* gc_n64_usb : Gamecube or N64 controller to USB firmware
Copyright (C) 2007-2014 Raphael Assenat <raph@raphnet.net>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include <string.h>
#include "gamepads.h"
#include "n64.h"
#include "gcn64_protocol.h"
#undef BUTTON_A_RUMBLE_TEST
/*********** prototypes *************/
static void n64Init(void);
static char n64Update(void);
static char n64Changed(void);
static void n64GetReport(gamepad_data *dst);
static void n64SetVibration(char enable);
static char must_rumble = 0;
#ifdef BUTTON_A_RUMBLE_TEST
static char force_rumble = 0;
#endif
static void n64Init(void)
{
n64Update();
}
#define RSTATE_INIT 0
#define RSTATE_OFF 1
#define RSTATE_TURNON 2
#define RSTATE_ON 3
#define RSTATE_TURNOFF 4
#define RSTATE_UNAVAILABLE 5
static unsigned char n64_rumble_state = RSTATE_UNAVAILABLE;
unsigned char tmpdata[40];
static char initRumble(void)
{
int count;
tmpdata[0] = N64_EXPANSION_WRITE;
tmpdata[1] = 0x80;
tmpdata[2] = 0x01;
memset(tmpdata+3, 0x80, 32);
/* Note: The old test (count > 0) was not reliable. */
count = gcn64_transaction(tmpdata, 35);
if (count == 8)
return 0;
return -1;
}
static char controlRumble(char enable)
{
int count;
tmpdata[0] = N64_EXPANSION_WRITE;
tmpdata[1] = 0xc0;
tmpdata[2] = 0x1b;
memset(tmpdata+3, enable ? 0x01 : 0x00, 32);
count = gcn64_transaction(tmpdata, 35);
if (count == 8)
return 0;
return -1;
}
static char n64Update(void)
{
unsigned char count;
unsigned char x,y;
unsigned char btns1, btns2;
unsigned char caps[3];
/* Pad answer to N64_GET_CAPABILITIES
*
* 0x050000 : 0000 0101 0000 0000 0000 0000 : No expansion pack
* 0x050001 : 0000 0101 0000 0000 0000 0001 : With expansion pack
* 0x050002 : 0000 0101 0000 0000 0000 0010 : Expansion pack removed
*
* Bit 0 tells us if there is something connected to the expansion port.
* Bit 1 tells is if there was something connected that has been removed.
*/
tmpdata[0] = N64_GET_CAPABILITIES;
count = gcn64_transaction(tmpdata, 1);
if (count != N64_CAPS_REPLY_LENGTH) {
// a failed read could mean the pack or controller was gone. Init
// will be necessary next time we detect a pack is present.
n64_rumble_state = RSTATE_INIT;
return -1;
}
caps[0] = gcn64_protocol_getByte(0);
caps[1] = gcn64_protocol_getByte(8);
caps[2] = gcn64_protocol_getByte(16);
/* Detect when a pack becomes present and schedule initialisation when it happens. */
if ((caps[2] & 0x01) && (n64_rumble_state == RSTATE_UNAVAILABLE)) {
n64_rumble_state = RSTATE_INIT;
}
/* Detect when a pack is removed. */
if (!(caps[2] & 0x01) || (caps[2] & 0x02) ) {
n64_rumble_state = RSTATE_UNAVAILABLE;
}
#ifdef BUTTON_A_RUMBLE_TEST
must_rumble = force_rumble;
//printf("Caps: %02x %02x %02x\r\n", caps[0], caps[1], caps[2]);
#endif
switch (n64_rumble_state)
{
case RSTATE_INIT:
/* Retry until the controller answers with a full byte. */
if (initRumble() != 0) {
if (initRumble() != 0) {
n64_rumble_state = RSTATE_UNAVAILABLE;
}
break;
}
if (must_rumble) {
controlRumble(1);
n64_rumble_state = RSTATE_ON;
} else {
controlRumble(0);
n64_rumble_state = RSTATE_OFF;
}
break;
case RSTATE_TURNON:
if (0 == controlRumble(1)) {
n64_rumble_state = RSTATE_ON;
}
break;
case RSTATE_TURNOFF:
if (0 == controlRumble(0)) {
n64_rumble_state = RSTATE_OFF;
}
break;
case RSTATE_ON:
if (!must_rumble) {
controlRumble(0);
n64_rumble_state = RSTATE_OFF;
}
break;
case RSTATE_OFF:
if (must_rumble) {
controlRumble(1);
n64_rumble_state = RSTATE_ON;
}
break;
}
tmpdata[0] = N64_GET_STATUS;
count = gcn64_transaction(tmpdata, 1);
if (count != N64_GET_STATUS_REPLY_LENGTH) {
return -1;
}
/*
Bit Function
0 A
1 B
2 Z
3 Start
4 Directional Up
5 Directional Down
6 Directional Left
7 Directional Right
8 unknown (always 0)
9 unknown (always 0)
10 L
11 R
12 C Up
13 C Down
14 C Left
15 C Right
16-23: analog X axis
24-31: analog Y axis
*/
btns1 = gcn64_protocol_getByte(0);
btns2 = gcn64_protocol_getByte(8);
x = gcn64_protocol_getByte(16); // X axis
y = gcn64_protocol_getByte(24); // Y axis
#ifdef BUTTON_A_RUMBLE_TEST
if (btns1 & 0x80) {
force_rumble = 1;
} else {
force_rumble = 0;
}
#endif
last_built_report.pad_type = PAD_TYPE_N64;
last_built_report.n64.buttons = (btns1 << 8) | btns2;
last_built_report.n64.x = x;
last_built_report.n64.y = y;
/* Copy all the data as-is for the raw field */
last_built_report.n64.raw_data[0] = btns1;
last_built_report.n64.raw_data[1] = btns2;
last_built_report.n64.raw_data[2] = x;
last_built_report.n64.raw_data[3] = y;
/* Some cheap non-official controllers
* use the full 8 bit range instead of the
* normal +-80 observed on official controllers. In
* particular, some units (but not all!) produced
* by TTX. The symptom is usually "The joystick
* left direction does not work".
*
* So I limit values to the -127 to +127 range,
* otherwise it causes problem later
* when the sign is inverted. Using 16 bit
* signed numbers instead of 8 bit would solve
* this, but this is only for cheap, not
* even worth using controllers so I don't
* care.
*
* The joystick will now "work" as bad as it would
* on a N64, or maybe a little better. This should
* help people realise they got what the paid for
* instead of suspecting the adapter. */
if (last_built_report.n64.x == -128)
last_built_report.n64.x = -127;
if (last_built_report.n64.y == -128)
last_built_report.n64.y = -127;
return 0;
}
static char n64Probe(void)
{
int count;
char i;
unsigned char tmp;
/* Pad answer to N64_GET_CAPABILITIES
*
* 0x050000 : 0000 0101 0000 0000 0000 0000 : No expansion pack
* 0x050001 : 0000 0101 0000 0000 0000 0001 : With expansion pack
* 0x050002 : 0000 0101 0000 0000 0000 0010 : Expansion pack removed
*
* Bit 0 tells us if there is something connected to the expansion port.
* Bit 1 tells is if there was something connected that has been removed.
*/
n64_rumble_state = RSTATE_UNAVAILABLE;
for (i=0; i<15; i++)
{
_delay_ms(30);
tmp = N64_GET_CAPABILITIES;
count = gcn64_transaction(&tmp, 1);
if (count == N64_CAPS_REPLY_LENGTH) {
return 1;
}
}
return 0;
}
static char n64Changed(void)
{
return memcmp(&last_built_report, &last_sent_report, sizeof(gamepad_data));
}
static void n64GetReport(gamepad_data *dst)
{
if (dst)
memcpy(dst, &last_built_report, sizeof(gamepad_data));
memcpy(&last_sent_report, &last_built_report, sizeof(gamepad_data));
}
static void n64SetVibration(char enable)
{
must_rumble = enable;
}
static Gamepad N64Gamepad = {
.init = n64Init,
.update = n64Update,
.changed = n64Changed,
.getReport = n64GetReport,
.probe = n64Probe,
.setVibration = n64SetVibration,
};
Gamepad *n64GetGamepad(void)
{
return &N64Gamepad;
}