283 lines
6.9 KiB
C
283 lines
6.9 KiB
C
/* gc_n64_usb : Gamecube or N64 controller to USB firmware
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Copyright (C) 2007-2015 Raphael Assenat <raph@raphnet.net>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <util/delay.h>
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#include "gcn64_protocol.h"
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#include "gcn64txrx.h"
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#undef FORCE_KEYBOARD
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#define GCN64_BUF_SIZE 600
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static unsigned char gcn64_workbuf[GCN64_BUF_SIZE];
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/******** IO port definitions and options **************/
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#ifndef STK525
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#define GCN64_DATA_PORT PORTD
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#define GCN64_DATA_DDR DDRD
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#define GCN64_DATA_PIN PIND
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#define GCN64_DATA_BIT (1<<0)
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#define GCN64_BIT_NUM_S "0" // for asm
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#else
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#define GCN64_DATA_PORT PORTA
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#define GCN64_DATA_DDR DDRA
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#define GCN64_DATA_PIN PINA
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#define GCN64_DATA_BIT (1<<0)
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#define GCN64_BIT_NUM_S "0" // for asm
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#endif
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#define DISABLE_INTS_DURING_COMM
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/* Read a byte from the buffer (where 1 byte is 1 bit).
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* MSb first.
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*/
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unsigned char gcn64_protocol_getByte(int offset)
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{
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unsigned char val, b;
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unsigned char volatile *addr = gcn64_workbuf + offset;
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for (b=0x80, val=0; b; b>>=1)
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{
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if (*addr)
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val |= b;
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addr++;
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}
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return val;
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}
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void gcn64_protocol_getBytes(int offset, int n_bytes, unsigned char *dstbuf)
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{
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int i;
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for (i=0; i<n_bytes; i++) {
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*dstbuf = gcn64_protocol_getByte(offset + (i*8));
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dstbuf++;
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}
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}
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/* \brief Decode the received length of low/high states to byte-per-bit format
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*
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* The result is in workbuf.
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*
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**/
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static void gcn64_decodeWorkbuf(unsigned int count)
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{
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unsigned int i;
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volatile unsigned char *output = gcn64_workbuf;
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volatile unsigned char *input = gcn64_workbuf;
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unsigned char t;
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//
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// ________
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// ________/
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//
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// [i*2] [i*2+1]
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//
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// ________________
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// 0 : ____/
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// ____
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// 1 : ________________/
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//
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// The timings on a real N64 are
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//
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// 0 : 1 us low, 3 us high
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// 1 : 3 us low, 1 us high
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//
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// However, HORI pads use something similar to
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//
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// 0 : 1.5 us low, 4.5 us high
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// 1 : 4.5 us low, 1.5 us high
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//
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//
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// No64 us = microseconds
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// This operation takes approximately 100uS on 64bit gamecube messages
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for (i=0; i<count; i++) {
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t = *input;
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input++;
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*output = t < *input;
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input++;
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output++;
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}
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}
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void gcn64protocol_hwinit(void)
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{
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// data as input
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GCN64_DATA_DDR &= ~(GCN64_DATA_BIT);
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// keep data low. By toggling the direction, we make the
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// pin act as an open-drain output.
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GCN64_DATA_PORT &= ~GCN64_DATA_BIT;
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/* debug bit PORTB4 (MISO) */
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DDRB |= 0x10;
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PORTB &= ~0x10;
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}
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/**
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* \brief Send n data bytes + stop bit, wait for answer.
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* \return The number of bits received, 0 on timeout/error.
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*
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* The result is in gcn64_workbuf, where each byte represents
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* a bit.
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*/
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int gcn64_transaction(unsigned char *data_out, int data_out_len)
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{
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int count;
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unsigned char sreg = SREG;
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#ifdef DISABLE_INTS_DURING_COMM
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cli();
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#endif
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gcn64_sendBytes(data_out, data_out_len);
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//count = gcn64_receive();
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count = gcn64_receiveBits(gcn64_workbuf, 0);
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SREG = sreg;
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if (!count)
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return 0;
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if (!(count & 0x01)) {
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// If we don't get an odd number of level lengths from gcn64_receive
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// something is wrong.
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//
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// The stop bit is a short (~1us) low state followed by an "infinite"
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// high state, which timeouts and lets the function return. This
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// is why we should receive and odd number of lengths.
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return 0;
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}
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gcn64_decodeWorkbuf(count);
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/* this delay is required on N64 controllers. Otherwise, after sending
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* a rumble-on or rumble-off command (probably init too), the following
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* get status fails. This starts to work at 2us. 5 should be safe. */
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_delay_us(5);
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/* return the number of full bits received. */
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return (count-1) / 2;
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}
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#if (GC_GETID != N64_GET_CAPABILITIES)
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#error N64 vs GC detection commnad broken
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#endif
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int gcn64_detectController(void)
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{
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unsigned char tmp = GC_GETID;
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int count;
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unsigned short id;
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count = gcn64_transaction(&tmp, 1);
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if (count == 0) {
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return CONTROLLER_IS_ABSENT;
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}
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if (count != 24) {
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return CONTROLLER_IS_UNKNOWN;
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}
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/*
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* -- Standard gamecube controller answer:
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* 0000 1001 0000 0000 0010 0011 : 0x090023 or
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* 0000 1001 0000 0000 0010 0000 : 0x090020
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*
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* 0000 1001 0000 0000 0010 0000
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*
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* -- Wavebird gamecube controller
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* 1010 1000 0000 0000 0000 0000 : 0xA80000
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* (receiver first power up, controller off)
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*
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* 1110 1001 1010 0000 0001 0111 : 0xE9A017
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* (controller on)
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*
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* 1010 1000 0000
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*
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* -- Intec wireless gamecube controller
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* 0000 1001 0000 0000 0010 0000 : 0x090020
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*
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*
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* -- Standard N64 controller
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* 0000 0101 0000 0000 0000 0000 : 0x050000 (no pack)
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* 0000 0101 0000 0000 0000 0001 : 0x050001 With expansion pack
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* 0000 0101 0000 0000 0000 0010 : 0x050002 Expansion pack removed
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*
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* -- Ascii keyboard (keyboard connector)
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* 0000 1000 0010 0000 0000 0000 : 0x082000
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*
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* Ok, so based on the above, when the second nibble is a 9 or 8, a
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* gamecube compatible controller is present. If on the other hand
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* we have a 5, then we are communicating with a N64 controller.
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*
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* This conclusion appears to be corroborated by my old printout of
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* the document named "Yet another gamecube documentation (but one
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* that's worth printing). The document explains that and ID can
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* be read by sending what they call the 'SI command 0x00 to
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* which the controller replies with 3 bytes. (Clearly, that's
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* what we are doing here). The first 16 bits are the id, and they
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* list, among other type of devices, the following:
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*
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* 0x0500 N64 controller
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* 0x0900 GC standard controller
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* 0x0900 Dkongas
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* 0xe960 Wavebird
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* 0xe9a0 Wavebird
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* 0xa800 Wavebird
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* 0xebb0 Wavebird
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*
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* This last entry worries me. I never observed it, but who knows
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* what the user will connect? Better be safe and consider 0xb as
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* a gamecube controller too.
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*
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* */
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id = gcn64_protocol_getByte(0)<<8;
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id |= gcn64_protocol_getByte(8);
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#ifdef FORCE_KEYBOARD
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return CONTROLLER_IS_GC_KEYBOARD;
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#endif
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switch (id >> 8) {
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case 0x05:
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return CONTROLLER_IS_N64;
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case 0x09: // normal controllers
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case 0x0b: // Never saw this one, but it is mentionned above.
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return CONTROLLER_IS_GC;
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case 0x08:
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if (id == 0x0820) {
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// Ascii keyboard
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return CONTROLLER_IS_GC_KEYBOARD;
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}
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// wavebird, controller off.
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return CONTROLLER_IS_GC;
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default:
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return CONTROLLER_IS_UNKNOWN;
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}
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return 0;
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}
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