{"id":44743,"date":"2023-07-29T18:18:20","date_gmt":"2023-06-30T01:18:51","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/44743-2\/"},"modified":"2024-04-30T15:57:08","modified_gmt":"2024-04-30T07:57:08","slug":"44743-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/44743-2\/","title":{"rendered":""},"content":{"rendered":"

\u7d44\u307f\u8fbc\u307fLinux\u3067Golang\u3092\u4f7f\u3063\u3066\u3044\u308b\u3068\u3001ioctl\u306e\u30b7\u30b9\u30c6\u30e0\u30b3\u30fc\u30eb\u3092\u4f7f\u7528\u3057\u305f\u3044\u5834\u9762\u304c\u51fa\u3066\u304d\u307e\u3059\u3002ioctl\u306f\u6c4e\u7528\u7684\u3067\u4f7f\u7528\u3059\u308b\u5834\u9762\u306b\u3088\u3063\u3066\u7570\u306a\u308b\u30b9\u30c8\u30e9\u30af\u30c1\u30e3\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002
\nGolang\u3067\u30ab\u30fc\u30cd\u30eb\u306e\u5b9a\u7fa9\u3059\u308b\u30b9\u30c8\u30e9\u30af\u30c1\u30e3\u306b\u5024\u3092\u30bb\u30c3\u30c8\u3059\u308b\u5834\u5408\u3001\u4ee5\u4e0b\u306e2\u3064\u306e\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

    \n
  1. \n
      cgo\u3092\u4f7f\u3063\u3066\u30ab\u30fc\u30cd\u30eb\u306e\u30d8\u30c3\u30c0\u3092\u30a4\u30f3\u30af\u30eb\u30fc\u30c9\u3059\u308b\u3002<\/ol>\n<\/li>\n<\/ol>\n

       <\/p>\n

        Golang\u3067\u30e1\u30e2\u30ea\u30ec\u30a4\u30a2\u30a6\u30c8\u304c\u7b49\u4fa1\u306b\u306a\u308b\u3088\u3046\u306astruct\u3092\u5b9a\u7fa9\u3057\u3066\u4f7f\u7528\u3059\u308b\u3002<\/ol>\n

        \u4eca\u56de\u306f2\u306e\u65b9\u6cd5\u3092\u8a66\u3057\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n

        i2c\u306eioctl\u3067\u4f7f\u7528\u3055\u308c\u3066\u3044\u305fstruct<\/h1>\n
        \/* This is the structure as used in the I2C_RDWR ioctl call *\/<\/span>\r\nstruct<\/span> i2c_rdwr_ioctl_data<\/span> {<\/span>\r\n    struct<\/span> i2c_msg<\/span> __user<\/span> *<\/span>msgs<\/span>;<\/span>    \/* pointers to i2c_msgs *\/<\/span>\r\n    __u32<\/span> nmsgs<\/span>;<\/span>            \/* number of i2c_msgs *\/<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
        struct<\/span> i2c_msg<\/span> {<\/span>\r\n    __u16<\/span> addr<\/span>;<\/span> \/* slave address            *\/<\/span>\r\n    __u16<\/span> flags<\/span>;<\/span>\r\n#define I2C_M_TEN       0x0010  <\/span>\/* this is a ten bit chip address *\/<\/span>\r\n#define I2C_M_RD        0x0001  <\/span>\/* read data, from slave to master *\/<\/span>\r\n#define I2C_M_STOP      0x8000  <\/span>\/* if I2C_FUNC_PROTOCOL_MANGLING *\/<\/span>\r\n#define I2C_M_NOSTART       0x4000  <\/span>\/* if I2C_FUNC_NOSTART *\/<\/span>\r\n#define I2C_M_REV_DIR_ADDR  0x2000  <\/span>\/* if I2C_FUNC_PROTOCOL_MANGLING *\/<\/span>\r\n#define I2C_M_IGNORE_NAK    0x1000  <\/span>\/* if I2C_FUNC_PROTOCOL_MANGLING *\/<\/span>\r\n#define I2C_M_NO_RD_ACK     0x0800  <\/span>\/* if I2C_FUNC_PROTOCOL_MANGLING *\/<\/span>\r\n#define I2C_M_RECV_LEN      0x0400  <\/span>\/* length will be first received byte *\/<\/span>\r\n#define I2C_M_16BIT_REG     0x0002  <\/span>\/* indicate reg bit-width is 16bit *\/<\/span>\r\n#define I2C_M_16BIT_DATA    0x0008  <\/span>\/* indicate data bit-width is 16bit *\/<\/span>\r\n    __u16<\/span> len<\/span>;<\/span>      \/* msg length               *\/<\/span>\r\n    __u8<\/span> *<\/span>buf<\/span>;<\/span>      \/* pointer to msg data          *\/<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
        \u3053\u306e2\u3064\u306estruct\u3068\u30e1\u30e2\u30ea\u30ec\u30a4\u30a2\u30a6\u30c8\u304c\u7b49\u4fa1\u306b\u306a\u308b\u3088\u3046\u306aGo\u306estruct\u3092\u5b9a\u7fa9\u3057\u3066\u4f7f\u7528\u3057\u307e\u3057\u305f\u3002<\/p>\n
        Golang\u306e\u30b5\u30f3\u30d7\u30eb\u30d7\u30ed\u30b0\u30e9\u30e0<\/h1>\n
        const<\/span> (<\/span>\r\n    _I2C_RDWR<\/span>                =<\/span> 0x0707<\/span>\r\n    _I2C_RDRW_IOCTL_MAX_MSGS<\/span> =<\/span> 42<\/span>\r\n    _I2C_M_RD<\/span>                =<\/span> 0x0001<\/span>\r\n)<\/span>\r\n\r\ntype<\/span> i2c_msg<\/span> struct<\/span> {<\/span>\r\n    addr<\/span>      uint16<\/span>\r\n    flags<\/span>     uint16<\/span>\r\n    len<\/span>       uint16<\/span>\r\n    __padding<\/span> uint16<\/span>\r\n    buf<\/span>       uintptr<\/span>\r\n}<\/span>\r\n\r\ntype<\/span> i2c_rdwr_ioctl_data<\/span> struct<\/span> {<\/span>\r\n    msgs<\/span>  uintptr<\/span>\r\n    nmsgs<\/span> uint32<\/span>\r\n}<\/span>\r\n\r\nfunc<\/span> transfer<\/span>(<\/span>f<\/span> *<\/span>os<\/span>.<\/span>File<\/span>,<\/span> msgs<\/span> *<\/span>i2c_msg<\/span>,<\/span> n<\/span> int<\/span>)<\/span> (<\/span>err<\/span> error<\/span>)<\/span> {<\/span>\r\n    data<\/span> :=<\/span> i2c_rdwr_ioctl_data<\/span>{<\/span>\r\n        msgs<\/span>:<\/span>  uintptr<\/span>(<\/span>unsafe<\/span>.<\/span>Pointer<\/span>(<\/span>msgs<\/span>)),<\/span>\r\n        nmsgs<\/span>:<\/span> uint32<\/span>(<\/span>n<\/span>),<\/span>\r\n    }<\/span>\r\n    err<\/span> =<\/span> nil<\/span>\r\n    _<\/span>,<\/span> _<\/span>,<\/span> errno<\/span> :=<\/span> syscall<\/span>.<\/span>Syscall<\/span>(<\/span>\r\n        syscall<\/span>.<\/span>SYS_IOCTL<\/span>,<\/span>\r\n        uintptr<\/span>(<\/span>f<\/span>.<\/span>Fd<\/span>()),<\/span>\r\n        uintptr<\/span>(<\/span>_I2C_RDWR<\/span>),<\/span>\r\n        uintptr<\/span>(<\/span>unsafe<\/span>.<\/span>Pointer<\/span>(<\/span>&<\/span>data<\/span>)),<\/span>\r\n    )<\/span>\r\n    if<\/span> (<\/span>errno<\/span> !=<\/span> 0<\/span>)<\/span> {<\/span>\r\n        err<\/span> =<\/span> errno<\/span>\r\n    }<\/span>\r\n    return<\/span>\r\n}<\/span>\r\n\r\n<\/code><\/pre>\n
        \u3053\u308c\u306e\u5168\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u306fgist\u306b\u8cbc\u308a\u307e\u3057\u305f\u3002\u3053\u3053<\/p>\n
        \u4f59\u8ac7<\/h1>\n
        \u4eca\u56de\u4f7f\u7528\u3057\u305fSoC\u306ei2c\u30c9\u30e9\u30a4\u30d0\u304c\u7279\u6b8a\u306a\u3088\u3046\u3067\u3001\u4e00\u822c\u306ei2c\u7528\u306e\u30c0\u30f3\u30d7\u30b3\u30de\u30f3\u30c9\u7b49\u304c\u4f7f\u7528\u3067\u6765\u307e\u305b\u3093\u3067\u3057\u305f\u3002\u3088\u3063\u3066\u4e16\u306e\u4e2d\u306b\u3042\u308b\u3044\u304f\u3064\u304b\u306egolang\u306ei2c\u7528\u30e9\u30a4\u30d6\u30e9\u30ea\u3082\u4f7f\u3048\u307e\u305b\u3093\u3067\u3057\u305f\u3002
        \nSoC\u306eSDK\u306b\u4ed8\u5c5e\u3059\u308bi2c\u30c4\u30fc\u30eb\u3067\u4f7f\u3063\u3066\u3044\u308b\u30b7\u30b9\u30c6\u30e0\u30b3\u30fc\u30eb\u3092strace\u3067\u89b3\u5bdf\u3057\u3001\u305d\u308c\u3068\u540c\u69d8\u306e\u52d5\u304d\u3092\u3059\u308b\u3082\u306e\u3092golang\u3067\u66f8\u304d\u307e\u3057\u305f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
        \u7d44\u307f\u8fbc\u307fLinux\u3067Golang\u3092\u4f7f\u3063\u3066\u3044\u308b\u3068\u3001ioctl\u306e\u30b7\u30b9\u30c6\u30e0\u30b3\u30fc\u30eb\u3092\u4f7f\u7528\u3057\u305f\u3044\u5834\u9762\u304c\u51fa\u3066\u304d\u307e\u3059\u3002ioc […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-44743","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n- Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/44743-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:description\" content=\"\u7d44\u307f\u8fbc\u307fLinux\u3067Golang\u3092\u4f7f\u3063\u3066\u3044\u308b\u3068\u3001ioctl\u306e\u30b7\u30b9\u30c6\u30e0\u30b3\u30fc\u30eb\u3092\u4f7f\u7528\u3057\u305f\u3044\u5834\u9762\u304c\u51fa\u3066\u304d\u307e\u3059\u3002ioc […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/44743-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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