sco link state-优快云博客

本文介绍了蓝牙系统中SCO连接的状态机模型及其触发事件。详细解释了从初始状态到连接建立再到关闭的整个过程，包括各种过渡状态及事件类型。

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system/bt/bta/ag/bta_ag_int.h

/* sco states */
enum {
BTA_AG_SCO_SHUTDOWN_ST,   /* no sco listening, all sco connections closed */0
BTA_AG_SCO_LISTEN_ST,     /* sco listening */1
BTA_AG_SCO_CODEC_ST,      /* sco codec negotiation */2
BTA_AG_SCO_OPENING_ST,    /* sco connection opening */3
BTA_AG_SCO_OPEN_CL_ST,    /* opening sco connection being closed */4
BTA_AG_SCO_OPEN_XFER_ST, /* opening sco connection being transferred */5
BTA_AG_SCO_OPEN_ST,       /* sco open */6
BTA_AG_SCO_CLOSING_ST,    /* sco closing */7
BTA_AG_SCO_CLOSE_OP_ST,   /* closing sco being opened */8
BTA_AG_SCO_CLOSE_XFER_ST, /* closing sco being transferred */9
BTA_AG_SCO_SHUTTING_ST    /* sco shutting down */10

};

一般0->1->2->3->6->7->1->2->3->6->7......

/* sco events */
enum {
BTA_AG_SCO_LISTEN_E,       /* listen request */0
BTA_AG_SCO_OPEN_E,         /* open request */1
BTA_AG_SCO_XFER_E,         /* transfer request */2
BTA_AG_SCO_CN_DONE_E, /* codec negotiation done */3
BTA_AG_SCO_REOPEN_E, /* Retry with other codec when failed */4
BTA_AG_SCO_CLOSE_E,      /* close request */5
BTA_AG_SCO_SHUTDOWN_E,   /* shutdown request */6
BTA_AG_SCO_CONN_OPEN_E, /* sco open */7
BTA_AG_SCO_CONN_CLOSE_E, /* sco closed */8
BTA_AG_SCO_CI_DATA_E     /* SCO data ready */9
};

system/bt/bta/ag/bta_ag_sco.cc