/* gc_n64_usb : Gamecube or N64 controller to USB firmware Copyright (C) 2007-2014 Raphael Assenat 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 . */ #include #include #include #include #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; }