da14585讀取資料方法

你好，

抱歉误解你的意思,你想问的是,如何在外围端支持中央发送过来的gatt_read命令吧?

首先,需要给态度添加读属性,例如下面的CUST1_IDX_RECV_VALUE态度:

struct attm_desc_128 custs1_att_db [CUST1_IDX_NB] = {[CUST1_IDX_SVC] = {(uint8_t *) &att_decl_svc ATT_UUID_16_LEN,烫(RD,启用),sizeof (custs1_svc), sizeof (custs1_svc), (uint8_t *) &custs1_svc}, [CUST1_IDX_SEND_CHAR] = {(uint8_t *) &att_decl_char ATT_UUID_16_LEN,烫(RD,启用),sizeof (custs1_send_char), sizeof (custs1_send_char), (uint8_t *) &custs1_send_char}, [CUST1_IDX_SEND_VALUE] = {CUST1_SEND_UUID_128 ATT_UUID_128_LEN,烫(RD,使)|烫(WR,启用),DEF_CUST1_SEND_CHAR_LEN, 0,NULL}， [CUST1_IDX_RECV_CHAR] = {(uint8_t*)&att_decl_char, ATT_UUID_16_LEN, PERM(RD, ENABLE)， sizeof(custs1_recv_char)， sizeof(custs1_recv_char)， (cust8_t *)& custs1_recv_len}， [CUST1_IDX_RECV_VALUE] = {cust1_recv_128, ATT_UUID_128_LEN, PERM(NTF, ENABLE)， DEF_CUST1_RECV_CHAR_LEN, 0, NULL}， [cust1_idx_recv_cfg] = {(uint8_t*)&att_decl_cfg, ATT_UUID_16_LEN, PERM(RD, ENABLE)， | PERM(WR, ENABLE)， sizeof(uint16_t)， 0, NULL}，};

然后,在概要文件的任务文件中,添加GATTC_READ_CMD_IND命令,和其对应的处理程序,例如:

//在cust1_task.c中const struct ke_msg_handler custs1_connected[] = {GATTC_READ_CMD_IND， (ke_msg_func_t)gattc_read_cmd_ind_handler}， {GATTC_WRITE_CMD_IND， (ke_msg_func_t)gattc_write_cmd_ind_handler}， {GATTC_CMP_EVT， (ke_msg_func_t) gattc_cmp_ev_handler}， {CUSTS1_VAL_NTF_REQ， (ke_msg_func_t)custs1_val_set_req_handler}， {CUSTS1_VAL_IND_REQ， (ke_msg_func_t)custs1_val_set_req_handler}，};静态int gattc_read_cmd_ind_handler(ke_msg_id_t const msgstr, struct gattc_read_cmd_ind const *param, ke_task_id_t const dest_id, ke_task_id_t const src_id) {uint16_t att_idx, value_hdl;if (KE_IDX_GET(src_id) == custs1_env.con_info.conidx) {att_idx = param->handle - custs1_env.shdl;if(att_idx == CUST1_IDX_RECV_VALUE) {// got a read request，表示数据库中的数据已经被读取。}}返回(ke_msg_consuming);｝

以上。

每次中央(手机应用)发起一次读取请求,外围(580)的协议栈就会把相应的attitube数据库的内容返回给中央。数据返回成功后，协议栈就会向上层发送一条gattc_read_cmd_ind消息。

注意,阅读是被动的,周边无法知道中央发起阅读的时机而提前将数据准备好,然后交给中央去阅读