在对ble进行应用的时候，每个用户的需求可能不尽相同。这里着重介绍从机Broadcaster例程，只广播不连接。
使用该例程时可以在手机使用APP上对Broadcaster进行调试。
安卓端在应用市场搜索BLE调试助手下载使用，使用时要开启提示所需开启的权限。
将Broadcaster例程烧录到DEMO板中。
烧录后发现一个蓝牙名称为abc的设备没有connect（连接）的选项，只能广播我无法连接。
接下来主要的程序拆分讨论：相对于peripheral例程，Broadcaster是比较精简的。这里直接从扫描应答包开始讨论，在APP上我们看到设备的是名称是abc,对比一下peripheral的名称为Simple Peripheral。
此时我们应该会有个疑问Broadcaster扫描应答包中的名称应该是Broadcaster，为什么APP上显示的是abc呢？
这样就可以解释为什么设备名称不是Broadcaster而是abc，这个例程只有广播的功能，所以扫描应答包的设备名是不会显示出来的。
其中对 GAPRole_SetParameter(GAPROLE_ADVERT_ENABLED, sizeof(uint8_t), &initial_advertising_enable);进行更多的讨论
/*------------------------------------------------------------------- * FUNCTIONS - GAPRole API */ /** * @brief Set a GAP Role parameter. * * @note You can call this function with a GAP Parameter ID and it will set a GAP Parameter. * * @param param - Profile parameter ID: @ref GAPROLE_PROFILE_PARAMETERS * @param len - length of data to write * @param pValue - pointer to data to write. This is dependent on the parameter ID and * WILL be cast to the appropriate data type (example: data type of uint16_t * will be cast to uint16_t pointer). * * @return SUCCESS or INVALIDPARAMETER (invalid paramID) */ extern bStatus_t GAPRole_SetParameter( uint16_t param, uint16_t len, void *pValue );
GAPRole_SetParameter后的三个参数值分别是配置文件参数 ID、要写入的数据长度、指向要写入的数据的指针。
配置文件参数在lib文件里。
#define GAPROLE_PROFILEROLE 0x300 //!< Reading this parameter will return GAP Role type. Read Only. Size is uint8_t. #define GAPROLE_IRK 0x301 //!< Identity Resolving Key. Read/Write. Size is uint8_t[KEYLEN]. Default is all 0, which means that the IRK will be randomly generated. #define GAPROLE_SRK 0x302 //!< Signature Resolving Key. Read/Write. Size is uint8_t[KEYLEN]. Default is all 0, which means that the SRK will be randomly generated. #define GAPROLE_SIGNCOUNTER 0x303 //!< Sign Counter. Read/Write. Size is uint32_t. Default is 0. #define GAPROLE_BD_ADDR 0x304 //!< Device's Address. Read Only. Size is uint8_t[B_ADDR_LEN]. This item is read from the controller. #define GAPROLE_ADVERT_ENABLED 0x305 //!< Enable/Disable Advertising. Read/Write. Size is uint8_t. Default is TRUE=Enabled. #define GAPROLE_ADVERT_DATA 0x306 //!< Advertisement Data. Read/Write. Max size is B_MAX_ADV_EXT_LEN. Default to all 0. #define GAPROLE_SCAN_RSP_DATA 0x307 //!< Scan Response Data. Read/Write. Max size is B_MAX_ADV_EXT_LEN. Defaults to all 0. #define GAPROLE_ADV_EVENT_TYPE 0x308 //!< Advertisement Type. Read/Write. Size is uint8_t. Default is GAP_ADTYPE_ADV_IND. #define GAPROLE_ADV_DIRECT_TYPE 0x309 //!< Direct Advertisement Address Type. Read/Write. Size is uint8_t. Default is ADDRTYPE_PUBLIC. #define GAPROLE_ADV_DIRECT_ADDR 0x30A //!< Direct Advertisement Address. Read/Write. Size is uint8_t[B_ADDR_LEN]. Default is NULL. #define GAPROLE_ADV_CHANNEL_MAP 0x30B //!< Which channels to advertise on. Read/Write Size is uint8_t. Default is GAP_ADVCHAN_ALL #define GAPROLE_ADV_FILTER_POLICY 0x30C //!< Filter Policy. Ignored when directed advertising is used. Read/Write. Size is uint8_t. Default is GAP_FILTER_POLICY_ALL. #define GAPROLE_STATE 0x30D //!< Reading this parameter will return GAP Peripheral Role State. Read Only. Size is uint8_t. #define GAPROLE_MAX_SCAN_RES 0x30E //!< Maximum number of discover scan results to receive. Default is 0 = unlimited. #define GAPROLE_MIN_CONN_INTERVAL 0x311 //!< Minimum Connection Interval to allow (n * 1.25ms). Range: 7.5 msec to 4 seconds (0x0006 to 0x0C80). Read/Write. Size is uint16_t. Default is 7.5 milliseconds (0x0006). #define GAPROLE_MAX_CONN_INTERVAL 0x312 //!< Maximum Connection Interval to allow (n * 1.25ms). Range: 7.5 msec to 4 seconds (0x0006 to 0x0C80). Read/Write. Size is uint16_t. Default is 4 seconds (0x0C80). // v5.x #define GAPROLE_PHY_TX_SUPPORTED 0x313 //!< The transmitter PHYs that the Host prefers the Controller to use.Default is GAP_PHY_BIT_ALL #define GAPROLE_PHY_RX_SUPPORTED 0x314 //!< The receiver PHYs that the Host prefers the Controller to use.Default is GAP_PHY_BIT_ALL #define GAPROLE_PERIODIC_ADVERT_DATA 0x315 //!< Periodic advertisement Data. Read/Write. Max size is B_MAX_ADV_PERIODIC_LEN. Default to all 0. #define GAPROLE_PERIODIC_ADVERT_ENABLED 0x316 //!< bit0:Enable/Disable Periodic Advertising. Read/Write. Size is uint8_t. Default is FALSE=Disable. //!< bit1:Include the ADI field in AUX_SYNC_IND PDUs
这段代码为TMOS事件，TMOS的讲解可以参照这篇博客WCH TMOS用法详解 - debugdabiaoge - 博客园 (cnblogs.com)
广播流程与状态函数，
GAPROLE_STARTED的定义可以在lib库中看到
#define GAPROLE_STATE_ADV_MASK (0xF) //!< advertising states mask #define GAPROLE_STATE_ADV_SHIFT (0x0) //!< advertising states shift #define GAPROLE_INIT 0 //!< Waiting to be started #define GAPROLE_STARTED 1 //!< Started but not advertising #define GAPROLE_ADVERTISING 2 //!< Currently Advertising #define GAPROLE_WAITING 3 //!< Device is started but not advertising, is in waiting period before advertising again #define GAPROLE_CONNECTED 4 //!< In a connection #define GAPROLE_CONNECTED_ADV 5 //!< In a connection + advertising #define GAPROLE_ERROR 6 //!< Error occurred - invalid state
这只是最基础的讨论，如有问题请指正！
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