关于GATT_ReadCharValue 命令的回复

xiaobai wen

如题，当我使用BTool 给设备的 UUID 0x2902 的 UUID Description (Client Characteristic Configuration)发送 GATT_ReadCharValue 命令时，BTool读取到的数据一直为 00:00 。

问题：此返回值的意义？此返回值是否可以设置？及如何设置？请知道的朋友给个思路？

9 年多前

0 kqian0327 9 年多前

TI__Mastermind 18838 points

你好，

这个值是让你订阅notification与否。

如果你订阅，每次service值改变就通知client去读取。

你可以参考

软件设置如下所示：

第一在SimpleProfile_AddService函数里面高亮部分：

bStatus_t SimpleProfile_AddService( uint32 services )
{
uint8 status;

// Allocate Client Characteristic Configuration table
simpleProfileChar4Config = (gattCharCfg_t *)ICall_malloc( sizeof(gattCharCfg_t) *
linkDBNumConns );
if ( simpleProfileChar4Config == NULL )
{
return ( bleMemAllocError );
}

// Initialize Client Characteristic Configuration attributes
GATTServApp_InitCharCfg( INVALID_CONNHANDLE, simpleProfileChar4Config );

if ( services & SIMPLEPROFILE_SERVICE )
{
// Register GATT attribute list and CBs with GATT Server App
status = GATTServApp_RegisterService( simpleProfileAttrTbl,
GATT_NUM_ATTRS( simpleProfileAttrTbl ),
GATT_MAX_ENCRYPT_KEY_SIZE,
&simpleProfileCBs );
}

2在

bStatus_t SimpleProfile_SetParameter( uint8 param, uint8 len, void *value )函数里面：

case SIMPLEPROFILE_CHAR4:
if ( len == sizeof ( uint8 ) )
{
simpleProfileChar4 = *((uint8*)value);
//One choice
// See if Notification has been enabled
GATTServApp_ProcessCharCfg( simpleProfileChar4Config, &simpleProfileChar4, FALSE,
simpleProfileAttrTbl, GATT_NUM_ATTRS( simpleProfileAttrTbl ),
// INVALID_TASK_ID, simpleProfile_ReadAttrCB );
// the other choice
dValue = GATTServApp_ReadCharCfg( notify_Handle, simpleProfileChar4Config );//读出CCC的值

static attHandleValueNoti_t pReport;
if ( dValue & GATT_CLIENT_CFG_NOTIFY ) //判断是否打开通知开关，打开了则发送数据
{
pReport.handle = simpleProfileAttrTbl[11].handle;
pReport.len = 1;
//osal_memcpy( pReport.pValue, &simpleProfileChar4, len); //数据
pReport.pValue[0] = simpleProfileChar4;
GATT_Notification( notify_Handle, &pReport, FALSE );
}
}
else
{
ret = bleInvalidRange;
}
break;