Joybus

Joybus

• Serial
• Bi-directional
• Half-duplex
• Asynchronous
• Idle-high
• Frequency
  • 1 MHz GC/N64
  • 800 kHz Wii

Protocol

Signal	Duty cycle
Zero	¯\____3 us____/¯¯¯¯¯
One	¯\1 us/¯¯¯¯¯¯¯¯¯¯¯¯¯
Console Stop	¯\1 us/¯¯¯¯¯¯¯¯¯
Controller Stop	¯\__2 us__/¯¯¯¯¯¯¯¯¯
Period	¯\______4 us______/¯

Note that this protocol is Big-Endian.

Devices

Device	ID
GBA	0x0004
N64 Controller	0x0500
GC Keyboard	0x0820
DK Bongos	0x0900
GC Controller	0x0900

Commands

Command	Signal	Resonse
"Reset"	0xFF	Status
"Init"	0x00	Status

Structures

Note, fields may be Little-Endian on certain devices.

typedef union {
    uint8_t raw[3];

    struct {
        union {
            uint16_t device;

            struct {
                uint8_t isDolphin : 1;
                uint8_t : 2;
                uint8_t notUltra64 : 2;
                uint8_t noRumble : 1;
                uint8_t : 2;
            };

            struct {
                uint8_t : 1;
                uint8_t fixedState : 1;
                uint8_t radioFreq : 1;
                uint8_t : 3;
                uint8_t receive : 1;
                uint8_t : 1;

                uint8_t type : 4; // 0x0=normal, 0x4=lite, 0x8=non-controller
                uint8_t notBrokenID : 1;
                uint8_t origin : 1;
                uint8_t : 2;
            } wireless;
        };

        union {
            uint8_t state;

            struct {
                uint8_t : 3;
                uint8_t rumble : 1;
                uint8_t : 4;
            };

            struct {
                uint8_t : 1;
                uint8_t receiving : 1;
                uint8_t : 1;
                uint8_t sending : 1;
                uint8_t general : 2;
                uint8_t : 2;
            } gba;
        };
    };
} Joybus_Status_t;

References

1. http://www.int03.co.uk/crema/hardware/gamecube/gc-control.html
2. https://sites.google.com/site/consoleprotocols/home/nintendo-joy-bus-documentation
3. http://hitmen.c02.at/files/yagcd/yagcd/chap9.html#sec9
4. https://github.com/NicoHood/Nintendo/blob/master/src/Gamecube_N64.h