Joybus Protocol: Difference between revisions
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The '''Joybus |
The '''Joybus Protocol''' is a proprietary, non-standard, serial protocol by which the N64's [[Peripheral Interface]] (as well as the GameCube and Game Boy Advance) communicates with controllers, controller accessories ([[Controller Pak]], [[Rumble Pak]], etc.), [[Randnet Keyboard|keyboards]], mice, [[Game Pak|game cartridges]], and other devices plugged into the console. |
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== Operation == |
== Operation == |
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[[File:Joybus_Bits.svg|thumb|270px]] |
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The protocol utilizes four types of bits: Zero, One, the Console Stop Bit, and the Controller Stop Bit. Zero, One, and the Controller Stop Bits are 4μs long, while the Console Stop Bit is 3μs. Communication is always initiated by the console, by sending an 8 bit (one byte) command to the device plugged in (not necessarily always a standard controller). A Console Stop Bit will usually follow after this command byte unless there is more data. |
The protocol utilizes four types of bits: Zero, One, the Console Stop Bit, and the Controller Stop Bit. Zero, One, and the Controller Stop Bits are 4μs long, while the Console Stop Bit is 3μs. Communication is always initiated by the console, by sending an 8 bit (one byte) command to the device plugged in (not necessarily always a standard controller). A Console Stop Bit will usually follow after this command byte unless there is more data. |
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{{ProtocolTableRow| 0xFF | Reset & Info | N64, GC, GBA | All | 1 | 3 }} |
{{ProtocolTableRow| 0xFF | Reset & Info | N64, GC, GBA | All | 1 | 3 }} |
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{{ProtocolTableRow| 0x00 | Info | N64, GC, GBA | All | 1 | 3 }} |
{{ProtocolTableRow| 0x00 | Info | N64, GC, GBA | All | 1 | 3 }} |
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{{ProtocolTableRow| 0x01 | Controller State | N64 | Controller, Mouse | 1 | 4 }} |
{{ProtocolTableRow| 0x01 | Controller State | N64 | [[Controller]], Mouse | 1 | 4 }} |
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{{ProtocolTableRow| 0x02 | Read Controller Accessory | N64 | Transfer, Controller, Bio Sensor, and Rumble Paks | 3 | 32 }} |
{{ProtocolTableRow| 0x02 | Read Controller Accessory | N64 | [[Transfer Pak|Transfer]], Controller, [[Bio Sensor]], and Rumble Paks | 3 | 32 }} |
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{{ProtocolTableRow| 0x03 | Write Controller Accessory | N64 | Transfer, Controller, Bio Sensor, and Rumble Paks | 35 | 0 }} |
{{ProtocolTableRow| 0x03 | Write Controller Accessory | N64 | Transfer, Controller, Bio Sensor, and Rumble Paks | 35 | 0 }} |
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{{ProtocolTableRow| 0x04 | Read EEPROM | N64 | Cartridge | ? | ? }} |
{{ProtocolTableRow| 0x04 | Read EEPROM | N64 | Cartridge | ? | ? }} |
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{{ProtocolTableRow| 0x11 | Reserved | | | ? | ? }} |
{{ProtocolTableRow| 0x11 | Reserved | | | ? | ? }} |
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{{ProtocolTableRow| 0x12 | Reserved | | | ? | ? }} |
{{ProtocolTableRow| 0x12 | Reserved | | | ? | ? }} |
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{{ProtocolTableRow| 0x13 | Read Keypress | N64 | Randnet Keyboard | 2 | 7 }} |
{{ProtocolTableRow| 0x13 | Read Keypress | N64 | [[Randnet Keyboard]] | 2 | 7 }} |
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{{ProtocolTableRow| 0x14 | Read GBA | GC, GBA | GBA | ? | ? }} |
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{{ProtocolTableRow| 0x15 | Write GBA | GC, GBA | GBA | ? | ? }} |
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{{ProtocolTableRow| 0x16-0x2F | Unknown | | | ? | ? }} |
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{{ProtocolTableRow| 0x30 | Force Feedback | GC | Steering Wheel | ? | ? }} |
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{{ProtocolTableRow| 0x31-0x3F | Unknown | | | ? | ? }} |
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{{ProtocolTableRow| 0x40 | Short Poll | GC | Controller | ? | ? }} |
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{{ProtocolTableRow| 0x41 | Read Origin | GC | Controller | ? | ? }} |
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{{ProtocolTableRow| 0x42 | Calibrate | GC | Controller | ? | ? }} |
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{{ProtocolTableRow| 0x43 | Long Poll | GC | Controller | ? | ? }} |
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{{ProtocolTableRow| 0x44-0x53 | Unknown | | | ? | ? }} |
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{{ProtocolTableRow| 0x54 | Poll | GC | Keyboard | ? | ? }} |
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{{ProtocolTableRow| 0x55-0xFE | Unknown | | | ? | ? }} |
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<small>'''''{{sup|†}}''' Real Time Clock''</small> |
<small>'''''{{sup|†}}''' Real Time Clock''</small> |
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