哪里可以找到CC2540 termination reason from LL参数的说明？

LL.h有定义，搜索LL_STATUS_ERROR_。
 
                                                                          

/*
** LL API Status Codes
**
** Note: These status values map directly to the HCI Error Codes.
**       Per the Bluetooth Core Specification, V4.0.0, Vol. 2, Part D.
*/
#define LL_STATUS_SUCCESS                              0x00 // Success
#define LL_STATUS_ERROR_UNKNOWN_CONN_HANDLE            0x02 // Unknown Connection Identifier
#define LL_STATUS_ERROR_INACTIVE_CONNECTION            0x02 // Unknown Connection Identifier for now; may be needed for multiple connections
#define LL_STATUS_ERROR_AUTH_FAILURE                   0x05 // Authentication Failure
#define LL_STATUS_ERROR_PIN_OR_KEY_MISSING             0x06 // Pin or Key Missing
#define LL_STATUS_ERROR_OUT_OF_CONN_RESOURCES          0x07 // Memory Capacity Exceeded
#define LL_STATUS_ERROR_OUT_OF_TX_MEM                  0x07 // Memory Capacity Exceeded
#define LL_STATUS_ERROR_OUT_OF_RX_MEM                  0x07 // Memory Capacity Exceeded
#define LL_STATUS_ERROR_OUT_OF_HEAP                    0x07 // Memory Capacity Exceeded
#define LL_STATUS_ERROR_WL_TABLE_FULL                  0x07 // Memory Capacity Exceeded
#define LL_STATUS_ERROR_CONNECTION_TIMEOUT             0x08 // Connection Timeout
#define LL_STATUS_ERROR_CONNECTION_LIMIT_EXCEEDED      0x09 // Connection Limit Exceeded
#define LL_STATUS_ERROR_COMMAND_DISALLOWED             0x0C // Command Disallowed
#define LL_STATUS_ERROR_DUE_TO_LIMITED_RESOURCES       0x0D // Command Rejected Due To Limited Resources
#define LL_STATUS_ERROR_DUE_TO_DELAYED_RESOURCES       0x0D // Command Delayed Due To Limited Resources
#define LL_STATUS_ERROR_FEATURE_NOT_SUPPORTED          0x11 // Unsupported Feature or Parameter Value
#define LL_STATUS_ERROR_UNEXPECTED_PARAMETER           0x12 // Invalid HCI Command Parameters
#define LL_STATUS_ERROR_ILLEGAL_PARAM_COMBINATION      0x12 // Invalid HCI Command Parameters
#define LL_STATUS_ERROR_BAD_PARAMETER                  0x12 // Invalid HCI Command Parameters or 0x30: Parameter Out of Mandatory Range?
#define LL_STATUS_ERROR_UNKNOWN_ADV_EVT_TYPE           0x12 // Invalid HCI Command Parameters or 0x30: Parameter Out of Mandatory Range?
#define LL_STATUS_ERROR_PEER_TERM                      0x13 // Remote User Terminated Connection
#define LL_STATUS_ERROR_PEER_DEVICE_TERM_LOW_RESOURCES 0x14 // Remote Device Terminated Connection Due To Low Resources
#define LL_STATUS_ERROR_PEER_DEVICE_TERM_POWER_OFF     0x15 // Remote Device Terminated Connection Due To Power Off
#define LL_STATUS_ERROR_HOST_TERM                      0x16 // Connection Terminated By Local Host
#define LL_STATUS_ERROR_UNSUPPORTED_REMOTE_FEATURE     0x1A // Unsupported Remote Feature
#define LL_STATUS_ERROR_WL_ENTRY_NOT_FOUND             0x1F // Unspecified Error
#define LL_STATUS_ERROR_WL_TABLE_EMPTY                 0x1F // Unspecified Error
#define LL_STATUS_ERROR_RNG_FAILURE                    0x1F // Unspecified Error
#define LL_STATUS_ERROR_DISCONNECT_IMMEDIATE           0x1F // Unspecified Error
#define LL_STATUS_ERROR_UNEXPECTED_STATE_ROLE          0x21 // Role Change Not Allowed
#define LL_STATUS_ERROR_LL_TIMEOUT                     0x22 // Link Layer Response Timeout
#define LL_STATUS_ERROR_LL_TIMEOUT_HOST                0x22 // Link Layer Response Timeout
#define LL_STATUS_ERROR_LL_TIMEOUT_PEER                0x22 // Link Layer Response Timeout
#define LL_STATUS_ERROR_INSTANT_PASSED                 0x28 // Instant Passed
#define LL_STATUS_ERROR_INSTANT_PASSED_HOST            0x28 // Instant Passed
#define LL_STATUS_ERROR_INSTANT_PASSED_PEER            0x28 // Instant Passed
#define LL_STATUS_ERROR_KEY_PAIRING_NOT_SUPPORTED      0x29 // Pairing With Unit Key Not Supported
#define LL_STATUS_ERROR_NO_ADV_CHAN_FOUND              0x30 // Parameter Out Of Mandatory Range
#define LL_STATUS_ERROR_PARAM_OUT_OF_RANGE             0x30 // Parameter Out Of Mandatory Range
#define LL_STATUS_ERROR_UPDATE_CTRL_PROC_PENDING       0x3A // Controller Busy
#define LL_STATUS_ERROR_CTRL_PROC_ALREADY_ACTIVE       0x3A // Controller Busy
#define LL_STATUS_ERROR_VER_INFO_REQ_ALREADY_PENDING   0x3A // Controller Busy
#define LL_STATUS_ERROR_UNACCEPTABLE_CONN_INTERVAL     0x3B // Unacceptable Connection Interval
#define LL_STATUS_ERROR_DIRECTED_ADV_TIMEOUT           0x3C // Directed Advertising Timeout
#define LL_STATUS_ERROR_CONN_TERM_DUE_TO_MIC_FAILURE   0x3D // Connection Terminated Due To MIC Failure
#define LL_STATUS_ERROR_CONN_FAILED_TO_BE_ESTABLISHED  0x3E // Connection Failed To Be Established
#define LL_STATUS_ERROR_CONN_TIMING_FAILURE            0x3F // MAC Connection Failed
                                                                          

谢谢！
当central操作断开连接的话，返回0x22 ，( Link Layer Response Timeout)
当从机电源断开导致的断开连接，返回0x08，（Connection Timeout）
但是我还无意中测到一个返回值是：0x63 ，在LL.h里找不到，请问这个值代表什么？

截个图吧，0x63肯定不是蓝牙的Error code descriptions.你去翻蓝牙手册，最多到0x3F.
                                                                          

是无意中看到的，后来一直还没重现，等我抓到有效信息了再向您请教吧。谢谢！

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0x3F // MAC Connection Failed
这个一般是什么情况才会出现？？