CC2640之添加一个自定义的特性值

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测试环境


协议栈版本:BLE-STACK V2.1

IAR开发环境版本:IAR for Arm 7.40

硬件设备:Amo-SmartRF v2.0 开发板(对应TI官方的SmartRF06EB 开发板)

示例测试Demo工程:simpleBLEPeripheral工程




添加自定义特征值


我们今天一起来了解下,如何在一个现有的profile中添加一个自定义的特征值,而且该特征值具有读、写和通知权限。下面的讲解中,我们以simpleBLEPeripheral工程为例,来了解如何在其现有的profile中,添加一个具有读、写和通知功能的特征值char6。

 

首先,我们先了解下simpleBLEPeripheral工程原有的服务和特征值,该工程本身有4个服务,其中Simple Profile Service服务是我们可以添加自定义特征值的,该服务本身有5个特征值,UUID分别为FFF1,FFF2,FFF3,FFF4,FFF5,下面我们来实际看一下如何添加一个特征值char6,UUID为FFF6。


1.在C:\ti\simplelink\ble_cc26xx_2_01_00_44423\Projects\ble\Profiles\SimpleProfile目录下找到simpleGATTprofile.h文件,我们先在这个文件中定义我们要添加的新的特征值的一些声明:

#define SIMPLEPROFILE_CHAR6              5  // RW uint8 - Profile Characteristic 6 value#define SIMPLEPROFILE_CHAR6_UUID            0xFFF6// Length of Characteristic 6 in bytes#define SIMPLEPROFILE_CHAR6_LEN           19  // Position of simple char6 value in attribute array// char6特性在属性表中的位置,根据实际情况而定,协议栈中的demo添加之后分别是18,19#define SIMPLE_MEAS6_VALUE_POS            18#define SIMPLE_MEAS6_CCC_POS            19

2.在C:\ti\simplelink\ble_cc26xx_2_01_00_44423\Projects\ble\Profiles\SimpleProfile\CC26xx目录下找到simpleGATTprofile.c文件。

(1)在该文件全局变量声明UUID的地方,声明我们新添加的特征值的UUID:

// Characteristic 6 UUID: 0xFFF6CONST uint8 simpleProfilechar6UUID[ATT_BT_UUID_SIZE] ={ LO_UINT16(SIMPLEPROFILE_CHAR6_UUID), HI_UINT16(SIMPLEPROFILE_CHAR6_UUID)};

(2)在该文件内部变量声明的地方,声明一下我们要添加的新特征值char6的相关变量:

// Simple Profile Characteristic 6 Propertiesstatic uint8 simpleProfileChar6Props = GATT_PROP_READ | GATT_PROP_WRITE_NO_RSP | GATT_PROP_NOTIFY;// Characteristic 6 Valuestatic uint8 simpleProfileChar6[SIMPLEPROFILE_CHAR6_LEN] = { 0, 0, 0, 0, 0 };static uint8 simpleProfileChar6Len = 0;// Simple Profile Characteristic 6 Configuration Each client has its own// instantiation of the Client Characteristic Configuration. Reads of the// Client Characteristic Configuration only shows the configuration for// that client and writes only affect the configuration of that client.static gattCharCfg_t *simpleProfileChar6Config;// Simple Profile Characteristic 6 User Descriptionstatic uint8 simpleProfileChar6UserDesp[17] = "Characteristic 6";

(3)在该Profile的属性表

static gattAttribute_t simpleProfileAttrTbl[SERVAPP_NUM_ATTR_SUPPORTED] =

中添加char6相关配置,添加的代码如下:

// 17 Characteristic 6 Declaration{ { ATT_BT_UUID_SIZE, characterUUID },GATT_PERMIT_READ, 0,&simpleProfileChar6Props },// 18 Characteristic Value 6{ { ATT_BT_UUID_SIZE, simpleProfilechar6UUID },GATT_PERMIT_READ | GATT_PERMIT_WRITE,0, simpleProfileChar6 },// 19 Characteristic 6 configuration{ { ATT_BT_UUID_SIZE, clientCharCfgUUID },GATT_PERMIT_READ | GATT_PERMIT_WRITE, 0, (uint8 *)&simpleProfileChar6Config },// 20 Characteristic 6 User Description{ { ATT_BT_UUID_SIZE, charUserDescUUID },GATT_PERMIT_READ, 0, simpleProfileChar6UserDesp },

上面代码注释上的标号,是我自己标的,也就是属性表数组的下标,注意是从0开始,上述注释的下标就跟我之前头文件中定义的SIMPLE_MEAS6_VALUE_POS和SIMPLE_MEAS6_CCC_POS的值相对应。

 

因为增加了这4个数组成员,所以属性表SERVAPP_NUM_ATTR_SUPPORTED的值需要由原来的17修改为21,如下:

/********************************************************************** CONSTANTS*/#define SERVAPP_NUM_ATTR_SUPPORTED        21//17

(4)新添加的特征值char6具有通知功能,所以,我们需要在SimpleProfile_AddService函数中进行相应的初始化配置操作:

// Allocate Client Characteristic Configuration tablesimpleProfileChar6Config = (gattCharCfg_t *)ICall_malloc( sizeof(gattCharCfg_t) *linkDBNumConns );if ( simpleProfileChar6Config == NULL ){// Free already allocated dataICall_free( simpleProfileChar6Config );return ( bleMemAllocError );}......GATTServApp_InitCharCfg( INVALID_CONNHANDLE, simpleProfileChar6Config );

(5)SimpleProfile_SetParameter方法中参考其他特征值的配置,添加如下代码:

case SIMPLEPROFILE_CHAR6:if ( len <= SIMPLEPROFILE_CHAR6_LEN ) {VOID memcpy( simpleProfileChar6, value, len );simpleProfileChar6Len = len;// See if Notification has been enabledGATTServApp_ProcessCharCfg( simpleProfileChar6Config, simpleProfileChar6, FALSE,simpleProfileAttrTbl, GATT_NUM_ATTRS( simpleProfileAttrTbl ),INVALID_TASK_ID, simpleProfile_ReadAttrCB );}else{ret = bleInvalidRange;}break;

(6)SimpleProfile_GetParameter方法中参考其他特征值的配置,添加新特征值的相关配置:

case SIMPLEPROFILE_CHAR6:VOID memcpy( value, simpleProfileChar6, simpleProfileChar6Len );break;  

(7)simpleProfile_ReadAttrCB函数是调用读之后的回调函数,在其中添加新特征值的相应处理:

case SIMPLEPROFILE_CHAR6_UUID:*pLen = SIMPLEPROFILE_CHAR6_LEN;VOID memcpy( pValue, pAttr->pValue, SIMPLEPROFILE_CHAR6_LEN );break;

(8)simpleProfile_WriteAttrCB函数是调用写操作之后的回调函数,在其中添加新特征值的相应处理:

case SIMPLEPROFILE_CHAR6_UUID:if ( offset == 0 ){if ( len > SIMPLEPROFILE_CHAR6_LEN ){status = ATT_ERR_INVALID_VALUE_SIZE;}}else{status = ATT_ERR_ATTR_NOT_LONG;}//Write the valueif ( status == SUCCESS ){VOID memcpy( pAttr->pValue, pValue, SIMPLEPROFILE_CHAR6_LEN );//VOID memcpy( pAttr->pValue, pValue, len );//simpleProfileChar6Len = len;notifyApp = SIMPLEPROFILE_CHAR6;//tx_printf("pValue:%s",pAttr->pValue);}break;

(9)我们在该文件中封装一个通过通知功能发送数据的接口函数,源码如下:

/********************************************************************** @fn          SimpleProfile_Notification** @brief       Send a notification containing a ir value** @param       connHandle - connection handle* @param       pNoti - pointer to notification structure** @return      Success or Failure*/bStatus_t SimpleProfile_Notification( uint16 connHandle, attHandleValueNoti_t *pNoti ){uint16 value = GATTServApp_ReadCharCfg( connHandle, simpleProfileChar6Config );// If notifications is enabledif ( value & GATT_CLIENT_CFG_NOTIFY ){// Set the handlepNoti->handle = simpleProfileAttrTbl[SIMPLE_MEAS6_VALUE_POS].handle;// Send the notificationreturn GATT_Notification( connHandle, pNoti, FALSE );}return bleIncorrectMode;}

打开C:\ti\simplelink\ble_cc26xx_2_01_00_44423\Projects\ble\Profiles\SimpleProfile目录下的simpleGATTprofile.h文件,在其中添加该通知功能接口的声明,便于外部调用:

/********************************************************************** @fn          SimpleProfile_Notification** @brief       Send a notification containing a ir value** @param       connHandle - connection handle* @param       pNoti - pointer to notification structure** @return      Success or Failure*/extern bStatus_t SimpleProfile_Notification( uint16 connHandle, attHandleValueNoti_t *pNoti );

3.经过上面的配置,我们就在Profile中添加了自定义的特征值char6,下面我们在应用文件中添加测试程序,进行相应测试。

 

(1)定义两个内部变量,通知功能使用的变量以及连接句柄的变量:

static attHandleValueNoti_t simpleValue;// GAP connection handlestatic uint16 gapConnHandle;

(2)在初始化函数SimpleBLEPeripheral_init中对新添加的特征值char6进行初始化:

uint8_t charValue6[SIMPLEPROFILE_CHAR6_LEN] = { 1, 2, 3, 4, 5 };SimpleProfile_SetParameter(SIMPLEPROFILE_CHAR6, SIMPLEPROFILE_CHAR6_LEN,charValue6);

(3)在连接成功的回调函数SimpleBLEPeripheral_processStateChangeEvt中添加连接句柄获取的代码:

GAPRole_GetParameter( GAPROLE_CONNHANDLE, &gapConnHandle );

截图如下:



(4)然后,在写操作回调函数SimpleBLEPeripheral_processCharValueChangeEvt中添加char6写操作之后的处理代码:

case SIMPLEPROFILE_CHAR6:SimpleProfile_GetParameter(SIMPLEPROFILE_CHAR6, &newValue);LCD_WRITE_STRING_VALUE("Char 6:", (uint16_t)newValue, 16, LCD_PAGE4);break;

(5)最后在定期执行的事件中添加通知功能发送数据的操作代码,为了便于测试,我们直接在SimpleBLEPeripheral_performPeriodicTask定时执行的函数中将之前的函数内容屏蔽掉,添加如下测试代码:

simpleValue.pValue = GATT_bm_alloc(gapConnHandle,                                            ATT_HANDLE_VALUE_NOTI,                                           SIMPLEPROFILE_CHAR6_LEN, NULL);if(simpleValue.pValue != NULL){uint8_t *p = simpleValue.pValue;*p++ = 0x11;*p++ = 0x22;*p++ = 0x33;*p++ = 0x44;simpleValue.len = (uint8_t)(p - simpleValue.pValue);//tx_printf("notify\r\n");if(SimpleProfile_Notification(gapConnHandle,&simpleValue) != SUCCESS){GATT_bm_free((gattMsg_t *)&simpleValue, ATT_HANDLE_VALUE_NOTI);}}

通过上面的应用层设置和调用,我们就可以烧录到板子中通过手机的BLE测试工具进行连接测试了,通过测试,配置正确,大家可以试一下。

















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