[问答]

CH573蓝牙作为主机时无法接收从机发来的透传数据是哪里出了问题？

问答对人有帮助，内容完整，我也想知道答案 0 我用CH573跑蓝牙主机程序，现在能找到并连接从机设备，但是无法接收来自从机的透传数据，想请假大家，是不是因为主机程序中没有使能CCCD，所以接收不到notify。如果是的话，主机程序中该如何使能CCCD。下面图片是串口输出的一些信息。 0
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答案对人有帮助，有参考价值 0 蓝牙连上后,一般来说要先进行服务和特征发现, 拿到对应uuid 对应的handle, 然后根据handle去操作,诸如使能cccd,和读写数据如下面是一个发现服务,发现char 和获取cccd 对应的handle的api: void central_db_dis_process(void){ uint8_t result = 0; attReadByTypeReq_t req; switch(ble_db_dis_state){ case BLE_DISC_STATE_IDLE: break; case BLE_DISC_STATE_SVC: result = GATT_DiscPrimaryServiceByUUID( centralConnHandle, service_uuid, 16, centralTaskId ); PRINT("GATT_DiscPrimaryServiceByUUID:%xrn",result); break; case BLE_DISC_STATE_CHAR: result = GATT_DiscAllChars(centralConnHandle,centralSvcStartHdl,centralSvcEndHdl,centralTaskId); break; case BLE_DISC_STATE_CCCD: req.startHandle = centralSvcStartHdl; req.endHandle = centralSvcEndHdl; req.type.len = ATT_BT_UUID_SIZE; req.type.uuid[0] = LO_UINT16(GATT_CLIENT_CHAR_CFG_UUID); req.type.uuid[1] = HI_UINT16(GATT_CLIENT_CHAR_CFG_UUID); result = GATT_ReadUsingCharUUID( centralConnHandle, &req, centralTaskId ); break; default: break; } if(result != SUCCESS){ if(centralConnHandle != BLE_STATE_IDLE){ tmos_start_task(centralTaskId,START_SVC_DISCOVERY_EVT,1600); }else{ PRINT("conntection has been disconnectedrn"); } } } 其中处理函数为: /********************************************************************* * @fn centralGATTDiscoveryEvent * * @brief Process GATT discovery event * * @return none / static void centralGATTDiscoveryEvent( gattMsgEvent_t pMsg ){ PRINT("centralGATTDiscoveryEventrn"); switch(ble_db_dis_state){ case BLE_DISC_STATE_SVC: // Service found, store handles if ( pMsg->method == ATT_FIND_BY_TYPE_VALUE_RSP ){ if( pMsg->msg.findByTypeValueRsp.numInfo > 0 ){ centralSvcStartHdl = ATT_ATTR_HANDLE(pMsg->msg.findByTypeValueRsp.pHandlesInfo,0); centralSvcEndHdl = ATT_GRP_END_HANDLE(pMsg->msg.findByTypeValueRsp.pHandlesInfo,0); // Display Profile Service handle range PRINT("Found Profile Service handle : %x ~ %x n",centralSvcStartHdl,centralSvcEndHdl); } if( ( pMsg->hdr.status == bleProcedureComplete )\|\|( pMsg->method == ATT_ERROR_RSP ) ) { if ( centralSvcStartHdl != 0 ){ central_db_dis_change_state(BLE_DISC_STATE_CHAR); } } } break; case BLE_DISC_STATE_CHAR: // Characteristic found, store handle if ( pMsg->method == ATT_READ_BY_TYPE_RSP ){ if(pMsg->msg.readByTypeRsp.numPairs > 0 ){ for(unsigned char i = 0; i < pMsg->msg.readByTypeRsp.numPairs ; i++){ #if 0 //characteristic properties uint8_t char_properties = pMsg->msg.readByTypeRsp.pDataList[pMsg->msg.readByTypeRsp.len * i + 2]; #endif uint16_t char_value_handle = BUILD_UINT16(pMsg->msg.readByTypeRsp.pDataList[pMsg->msg.readByTypeRsp.len * i+3], pMsg->msg.readByTypeRsp.pDataList[pMsg->msg.readByTypeRsp.len * i + 4]); //characteristic uuid length uint8_t char_uuid_length = pMsg->msg.readByGrpTypeRsp.len - 5; //uuid uint8_t chat_uuid = &(pMsg->msg.readByGrpTypeRsp.pDataList[pMsg->msg.readByGrpTypeRsp.len i + 5]); if(sizeof(write_uuid) == char_uuid_length){ if(tmos_memcmp(write_uuid,chat_uuid,char_uuid_length)){ PRINT("write_uuid found,handle:%02xrn",char_value_handle); }else if(tmos_memcmp(notify_uuid,chat_uuid,char_uuid_length)){ PRINT("notify uuid found,handle:%02xrn",char_value_handle); } } } } if((pMsg->hdr.status == bleProcedureComplete ) \|\| ( pMsg->method == ATT_ERROR_RSP ) ) { central_db_dis_change_state(BLE_DISC_STATE_CCCD); PRINT("BLE_DISC_STATE_CHAR donern"); } } break; case BLE_DISC_STATE_CCCD: if ( pMsg->method == ATT_READ_BY_TYPE_RSP) { if(pMsg->msg.readByTypeRsp.numPairs > 0 ) { centralCCCDHdl = BUILD_UINT16( pMsg->msg.readByTypeRsp.pDataList[0], pMsg->msg.readByTypeRsp.pDataList[1] ); PRINT("Found client characteristic configuration handle : %x n",centralCCCDHdl); central_enbale_notify(centralConnHandle,centralCCCDHdl); } ble_db_dis_state = BLE_DISC_STATE_IDLE; } break; default: break; } } 然后enable notify 可以是: uint8_t central_gatt_write_char_value(uint16_t connection_handle,uint16_t char_handle,uint8_t data,uint16_t length){ uint8_t result; attWriteReq_t req; req.cmd = FALSE; req.sig = FALSE; req.handle = char_handle; req.len = length; req.pValue = GATT_bm_alloc(connection_handle,ATT_WRITE_REQ,req.len,NULL,0); if ( req.pValue != NULL ){ tmos_memcpy(req.pValue,data,length); result = GATT_WriteCharValue(centralConnHandle,&req,centralTaskId); if(SUCCESS == result){ return SUCCESS; }else{ GATT_bm_free((gattMsg_t )&req, ATT_WRITE_REQ); write_data_when_failed.connection_handle = connection_handle; write_data_when_failed.char_handle = char_handle; write_data_when_failed.data_length = length; tmos_memcpy(write_data_when_failed.data,data,write_data_when_failed.data_length); PRINT("data0 data1=%02x %02x rn",write_data_when_failed.data[0],write_data_when_failed.data[1]); tmos_start_task(centralTaskId,START_WRITE_EVT,80); return result; } } return 0xff; } uint8_t central_enbale_notify(uint16_t connection_handle,uint16_t notify_handle){ uint8_t data[2] = {0x01,0x00}; return central_gatt_write_char_value(connection_handle,notify_handle,data,2); } uint8_t central_disable_notify(uint16_t connection_handle,uint16_t notify_handle){ uint8_t data[2] = {0x00,0x00}; return central_gatt_write_char_value(connection_handle,notify_handle,data,2); }

2022-9-5 09:18:38 评论举报叶恒