CH58X/CH57X/V208的Broadcaster（广播者）例程讲解

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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