CC2540 notify使能问题

请问，CC2540在发现特性值4的句柄之后多久可以使能Notify？为什么发现之后就使能不可以呢？过一段时间之后再使能才可以，请问这段时间可以设置吗？怎么设置？这段时间是多长？

zhikuan,

可以发现后立即使能。

那我发现后立即使能的返回值是这个blePending，我用了一个while直到返回值是SUCCESS，代码如下

while(a)
{
if ( uptechBleState[uptechDeviceNum] == BLE_STATE_CONNECTED &&
uptechBLEChartHdl[uptechDeviceNum][CHC4_HANDLE] != 0 &&
uptechBLEProcedureInProgress[uptechDeviceNum] == FALSE )
{
attWriteReq_t wrreq;
wrreq.handle = uptechBLEChartHdl[uptechDeviceNum][CHC4_HANDLE]+1;
wrreq.len = 2;
wrreq.value[0] = 0x01;
wrreq.value[1] = 0x00;
wrreq.sig = 0;
wrreq.cmd = 0;
a = GATT_WriteCharValue( uptechBLEConnHandle[uptechDeviceNum], &wrreq, simpleBLETaskId );
}
}

之后发过来的通知消息还是收不到，我在定时器里定时3S执行这些指令就可以收到通知，不知道是怎么回事，求解答

zhikuan,

你这样会重复去写那个使能notification，而且会阻塞其他进程，自然会有问题。

你写一遍就够了，然后在回调中会收到write response，并且状态是success之后就立即可以收到notification了，你可以在central代码中搜索 “pMsg->method == ATT_WRITE_RSP” 就能找到例子。

这个过程应该是瞬间的，不会3秒这样。

按照您说的，我修改了代码如下：

if ( ( pMsg->method == ATT_FIND_BY_TYPE_VALUE_RSP &&
pMsg->hdr.status == bleProcedureComplete ) ||
( pMsg->method == ATT_ERROR_RSP ) )
{
if ( uptechBLESvcStartHdl[uptechDeviceNum] != 0 )
{
// Discover characteristic
uptechBLEDiscState[uptechDeviceNum] = BLE_DISC_STATE_CHAR;

req.startHandle = uptechBLESvcStartHdl[uptechDeviceNum] ;
req.endHandle = uptechBLESvcEndHdl[uptechDeviceNum];
req.type.len = ATT_BT_UUID_SIZE;
req.type.uuid[0] = LO_UINT16(SIMPLEPROFILE_CHAR4_UUID);
req.type.uuid[1] = HI_UINT16(SIMPLEPROFILE_CHAR4_UUID);
GATT_ReadUsingCharUUID( uptechBLEConnHandle[uptechDeviceNum], &req, simpleBLETaskId );
}
}
}
else if ( uptechBLEDiscState[uptechDeviceNum] == BLE_DISC_STATE_CHAR )
{
if ( pMsg->method == ATT_READ_BY_TYPE_RSP &&
pMsg->msg.readByTypeRsp.numPairs > 0 )
{
uptechBLEChartHdl[uptechDeviceNum][CHC4_HANDLE] = BUILD_UINT16( pMsg->msg.readByTypeRsp.dataList[0],
pMsg->msg.readByTypeRsp.dataList[1] );
uptechBLEProcedureInProgress[uptechDeviceNum] = TRUE;
}else{
uptechBLEDiscState[uptechDeviceNum] = BLE_DISC_STATE_CHAR1;
req.startHandle = uptechBLESvcStartHdl[uptechDeviceNum] ;
req.endHandle = uptechBLESvcEndHdl[uptechDeviceNum];
req.type.len = ATT_BT_UUID_SIZE;
req.type.uuid[0] = LO_UINT16(SIMPLEPROFILE_CHAR1_UUID);
req.type.uuid[1] = HI_UINT16(SIMPLEPROFILE_CHAR1_UUID);
GATT_ReadUsingCharUUID( uptechBLEConnHandle[uptechDeviceNum], &req, simpleBLETaskId );

}
}else if(uptechBLEDiscState[uptechDeviceNum] == BLE_DISC_STATE_CHAR1){
if ( pMsg->method == ATT_READ_BY_TYPE_RSP &&
pMsg->msg.readByTypeRsp.numPairs > 0 )
{
uptechBLEChartHdl[uptechDeviceNum][CHC1_HANDLE] = BUILD_UINT16( pMsg->msg.readByTypeRsp.dataList[0],
pMsg->msg.readByTypeRsp.dataList[1] );
uptechBLEProcedureInProgress[uptechDeviceNum] = FALSE;
#if DEBUG_PROC
HalUARTWrite(HAL_UART_PORT_0,"Second\n", 7);
#endif
attWriteReq_t wrreq;
wrreq.handle = uptechBLEChartHdl[uptechDeviceNum][CHC4_HANDLE]+1;
wrreq.len = 2;
wrreq.value[0] = 0x01;
wrreq.value[1] = 0x00;
wrreq.sig = 0;
wrreq.cmd = 0;
GATT_WriteCharValue( uptechBLEConnHandle[uptechDeviceNum], &wrreq, simpleBLETaskId );
}
uptechBLEDiscState[uptechDeviceNum] = BLE_DISC_STATE_IDLE;

我查找到特性4的句柄，发送了一次使能Nontify，但是返回值不是SUCCESS，您有这方面的例子吗？最早使能Notify

我也遇到了同样的问题，不能使能从机端的notify。可以来讨论一下，power3347@163.com

你好，我刚学蓝牙，想问一个问题，要怎么样操作才能获得cc2541的特性值4的句柄？