joybus.h

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#ifndef __LIBDRAGON_JOYBUS_H
#define __LIBDRAGON_JOYBUS_H
 
#include <assert.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
#define JOYBUS_BLOCK_SIZE 64
#define JOYBUS_BLOCK_DWORDS ( JOYBUS_BLOCK_SIZE / sizeof(uint64_t) )
#define JOYBUS_ACCESSORY_DATA_SIZE  32
 
#define JOYBUS_PORT_COUNT 5
 
typedef uint16_t joybus_identifier_t;
 
#define JOYBUS_IDENTIFIER_UNKNOWN               0x0000
#define JOYBUS_IDENTIFIER_NONE                  0xFFFF
#define JOYBUS_IDENTIFIER_N64_VOICE_RECOGNITION 0x0001
#define JOYBUS_IDENTIFIER_N64_RANDNET_KEYBOARD  0x0002
#define JOYBUS_IDENTIFIER_64GB_LINK_CABLE       0x0003
#define JOYBUS_IDENTIFIER_GBA_LINK_CABLE        0x0004
#define JOYBUS_IDENTIFIER_CART_RTC              0x0010
#define JOYBUS_IDENTIFIER_CART_EEPROM_4KBIT     0x0080
#define JOYBUS_IDENTIFIER_CART_EEPROM_16KBIT    0x00C0
#define JOYBUS_IDENTIFIER_N64_CONTROLLER        0x0500
#define JOYBUS_IDENTIFIER_N64_MOUSE             0x0200
#define JOYBUS_IDENTIFIER_MASK_PLATFORM         0x1800
#define JOYBUS_IDENTIFIER_PLATFORM_GCN          0x0800
#define JOYBUS_IDENTIFIER_MASK_GCN_CONTROLLER   0x0100
#define JOYBUS_IDENTIFIER_MASK_GCN_NORUMBLE     0x2000
#define JOYBUS_IDENTIFIER_MASK_GCN_WIRELESS     0x8000
 
#define JOYBUS_IDENTIFY_STATUS_ACCESSORY_MASK             0x03
#define JOYBUS_IDENTIFY_STATUS_ACCESSORY_UNSUPPORTED      0x00
#define JOYBUS_IDENTIFY_STATUS_ACCESSORY_PRESENT          0x01
#define JOYBUS_IDENTIFY_STATUS_ACCESSORY_ABSENT           0x02
#define JOYBUS_IDENTIFY_STATUS_ACCESSORY_CHANGED          0x03
#define JOYBUS_IDENTIFY_STATUS_VOICE_RECOGNITON_READY     0x01
#define JOYBUS_IDENTIFY_STATUS_COMMAND_CHECKSUM_ERROR     0x04
#define JOYBUS_IDENTIFY_STATUS_GCN_RUMBLE_ACTIVE          0x08
#define JOYBUS_IDENTIFY_STATUS_EEPROM_BUSY                0x80
typedef void (*joybus_callback_t)(uint64_t *out_dwords, void *ctx);
 
void joybus_exec_async(const void * input, joybus_callback_t callback, void *ctx);
 
void joybus_exec( const void* input, void* output );
 
inline void joybus_exec_cmd(
    int port,
    size_t send_len,
    size_t recv_len,
    const void *send_data,
    void *recv_data
)
{
    // Validate the desired Joybus port offset
    assert((port >= 0) && (port < JOYBUS_PORT_COUNT));
    // Ensure the send_len and recv_len fit in the Joybus operation block
    assert((port + send_len + recv_len) < (JOYBUS_BLOCK_SIZE - 4));
    // Allocate the Joybus operation block input and output buffers
    uint8_t input[JOYBUS_BLOCK_SIZE] = {0};
    uint8_t output[JOYBUS_BLOCK_SIZE] = {0};
    // Skip commands on ports before the desired port offset
    size_t i = port;
    // Set the command metadata
    input[i++] = send_len;
    input[i++] = recv_len;
    // Copy the send_data into the input buffer
    memcpy(&input[i], send_data, send_len);
    i += send_len + recv_len;
    // Close out the Joybus operation block
    input[i] = 0xFE;
    input[sizeof(input) - 1] = 0x01;
    // Execute the Joybus operation synchronously
    joybus_exec(input, output);
    // Copy recv_data from the output buffer
    memcpy(recv_data, &output[i - recv_len], recv_len);
}
 
#define joybus_exec_cmd_struct(port, cmd) \
    joybus_exec_cmd(                      \
        port,                             \
        sizeof(cmd.send),                 \
        sizeof(cmd.recv),                 \
        (void *)&cmd.send,                \
        (void *)&cmd.recv                 \
    )
 
#ifdef __cplusplus
}
#endif
 
 
#endif