245 lines
6.6 KiB
C
245 lines
6.6 KiB
C
/* gc_n64_usb : Gamecube or N64 controller to USB adapter firmware
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Copyright (C) 2007-2016 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 <stdio.h>
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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 <string.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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#undef TRACE_GCN64
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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_BIT0 (1<<0)
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#define GCN64_DATA_BIT1 (1<<1)
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#define GCN64_DATA_BIT2 (1<<2)
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#define GCN64_DATA_BIT3 (1<<3)
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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_BIT0 (1<<0)
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#define GCN64_DATA_BIT1 (1<<2) // This is not an error
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#define GCN64_DATA_BIT2 (1<<1) // This is not an error
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#define GCN64_DATA_BIT3 (1<<3)
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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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void gcn64protocol_hwinit(void)
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{
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// data as input
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GCN64_DATA_DDR &= ~(GCN64_DATA_BIT0 | GCN64_DATA_BIT1 | GCN64_DATA_BIT2 | GCN64_DATA_BIT3);
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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_BIT0 | GCN64_DATA_BIT1 | GCN64_DATA_BIT2 | GCN64_DATA_BIT3);
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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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*
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* \param chn Channel (0 to 3)
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* \param tx Data to be transmitted
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* \param tx_len Transmission length
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* \param rx Reception buffer
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* \param rx_max Buffer size
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* \return The number of bytes received, 0 on timeout/error.
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*/
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unsigned char gcn64_transaction(unsigned char chn, const unsigned char *tx, int tx_len, unsigned char *rx, unsigned char rx_max)
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{
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int count;
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unsigned char sreg = SREG;
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void (*sendBytes)(const unsigned char *data, unsigned char n_bytes);
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unsigned char (*receiveBytes)(unsigned char *dstbuf, unsigned char max_bytes);
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switch(chn)
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{
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case 0: sendBytes = gcn64_sendBytes0; receiveBytes = gcn64_receiveBytes0; break;
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case 1: sendBytes = gcn64_sendBytes1; receiveBytes = gcn64_receiveBytes1; break;
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case 2: sendBytes = gcn64_sendBytes2; receiveBytes = gcn64_receiveBytes2; break;
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case 3: sendBytes = gcn64_sendBytes3; receiveBytes = gcn64_receiveBytes3; break;
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default: return 0;
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}
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#ifdef TRACE_GCN64
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int i;
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printf("TX[%d] = { ", tx_len);
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for (i=0; i<tx_len; i++) {
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printf("%02x ", tx[i]);
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}
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printf("}\r\n");
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#endif
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#ifdef DISABLE_INTS_DURING_COMM
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cli();
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#endif
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sendBytes(tx, tx_len);
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count = receiveBytes(rx, rx_max);
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SREG = sreg;
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if (count == 0xff) {
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#ifdef TRACE_GCN64
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printf("rx error\r\n");
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#endif
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return 0;
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}
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if (count == 0xfe) {
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#ifdef TRACE_GCN64
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printf("buffer too small\r\n");
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#endif
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return 0;
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}
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#ifdef TRACE_GCN64
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printf("RX[%d] = { ", count);
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for (i=0; i<count; i++) {
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printf("%02x ", rx[i]);
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}
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printf("}\r\n");
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#endif
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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 30us. 60us should be safe. */
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_delay_us(80); // Note that this results in a ~100us delay between packets.
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return count;
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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(unsigned char chn)
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{
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unsigned char tmp = GC_GETID;
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unsigned char count;
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unsigned short id;
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unsigned char data[4];
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count = gcn64_transaction(chn, &tmp, 1, data, sizeof(data));
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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 != GC_GETID_REPLY_LENGTH) {
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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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* -- N64 mouse --
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* 0000 0010 0000 0000 0000 0000 : 0x020000
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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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**/
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id = (data[0]<<8) | data[1];
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printf("Id: %04x (%d: %02x %02x %02x)\r\n", id, count, data[0], data[1], data[2]);
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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) & 0x0F) {
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case 0x02:
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return CONTROLLER_IS_N64_MOUSE;
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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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