描述
本文来源电子发烧友社区,作者:cszzlsw, 帖子地址:
https://bbs.elecfans.com/jishu_2030601_1_1.html1,首先要获得hisi3861芯片的wifi开发的相关接口和文档:https://bbs.elecfans.com/jishu_2028821_1_1.html这里就有相关的资料2.liteos_m文档库里面也有好多资料,在doc文件夹里3.首先需要连接wifi,可以参考文档:Hi3861V100/Hi3861LV100 Wi-Fi软件 开发指南.pdf4.找到sta模式,里面讲的很清楚,基于实际需求,把流程进行简化:STA功能开发的典型流程:步骤1 调用hi_wifi_sta_start,启动STA。步骤2 调用hi_wifi_sta_scan,hi_wifi_sta_scan_results,获取扫描结果。步骤3 根据接入网络需求,自定义筛选扫描结果,调用hi_wifi_sta_connect,进行连接。步骤4 调用hi_wifi_sta_get_connect_info,查询Wi-Fi连接状态。步骤5 连接成功后,调用netifapi_dhcp_start,启动DHCP客户端,获取IP地址。步骤6 调用hi_wifi_sta_disconnect ,离开当前连接的网络。步骤7 调用netifapi_dhcps_stop,停止DHCP客户端。步骤8 调用hi_wifi_sta_stop ,关闭STA。----结束,注意5,6,7步骤不是必须的5.在连接成功的毁掉开启dhcp获取ip地址之后并不会立马得到ip地址,所以我们开启一个线程不停得在等待拿到ip地址:
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case HI_WIFI_EVT_CONNECTED:
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printf("WiFi: Connectedn");
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printf("connected info: %s %sn", hisi_event->info.wifi_connected.ssid, hisi_event->info.wifi_connected.ifname);
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netifapi_dhcp_start(g_lwip_netif);
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{
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osThreadAttr_t attr;
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attr.name = "netTask";
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attr.attr_bits = 0U;
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attr.cb_mem = NULL;
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attr.cb_size = 0U;
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attr.stack_mem = NULL;
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attr.stack_size = 2048;
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attr.priority = 24;
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if (osThreadNew((osThreadFunc_t)netTask, NULL, &attr) == NULL)
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{
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printf("[LedExample] Falied to create LedTask!n");
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}
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}
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break;
复制代码
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static void *netTask(const char *arg)
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{
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printf("netTask:%pn", arg);
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u8_t ip_arr[4] = {0};
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u8_t ip_zero[4] = {0};
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// 下面这种方式也可以打印 IP、网关、子网掩码信息
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ip4_addr_t ip = {0};
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ip4_addr_t netmask = {0};
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ip4_addr_t gw = {0};
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int ret = 0;
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do
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{
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sleep(1);
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ret = netifapi_netif_get_addr(g_lwip_netif, &ip, &netmask, &gw);
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printf("netifapi_netif_get_addr: %drn", ret);
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if (ret == ERR_OK)
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{
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printf("ip = %srn", ip4addr_ntoa(&ip));
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printf("netmask = %srn", ip4addr_ntoa(&netmask));
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printf("gw = %srn", ip4addr_ntoa(&gw));
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memcpy(ip_arr, &ip.addr, sizeof(ip_arr));
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}
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} while (memcmp(ip_arr, ip_zero, sizeof(ip_arr)) == 0 || (ip_arr[0] != 192));
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printf("got ip :%d.%d.%d.%dn", ip_arr[0], ip_arr[1], ip_arr[2], ip_arr[3]);
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sample_tcp_client();
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return NULL;
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}
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拿到ip地址之后我们的wifi才能段真正连接成功6.之后就开启tcp客户端,相关代码 在demo_app里有,在文档:Hi3861V100/Hi3861LV100 lwIP 开发指南.pdf 里面也有,直接拷贝使用:
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int sample_tcp_client(void)
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{
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s32_t sfd = -1;
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struct sockaddr_in srv_addr = {0};
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// struct sockaddr_in cln_addr = {0};
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// socklen_t cln_addr_len = sizeof(cln_addr);
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s32_t ret = 0, i = 0;
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/* tcp client connection */
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printf("going to call socketn");
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sfd = socket(AF_INET, SOCK_STREAM, 0);
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if (sfd == -1)
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{
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printf("socket failed, return is %dn", sfd);
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goto FAILURE;
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}
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printf("socket succeeded, sfd %dn", sfd);
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srv_addr.sin_family = AF_INET;
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srv_addr.sin_addr.s_addr = inet_addr(PEER_IP);
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srv_addr.sin_port = htons(PEER_PORT);
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printf("going to call connectn");
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ret = connect(sfd, (struct sockaddr *)&srv_addr, sizeof(srv_addr));
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if (ret != 0)
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{
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printf("connect failed, return is %dn", ret);
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goto FAILURE;
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}
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printf("connec succeeded, return is %dn", ret);
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/* tcp client connection */
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/* send */
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memset(g_buf, 0, BUF_SIZE);
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strcpy((char *)g_buf, MSG);
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printf("calling send...n");
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ret = send(sfd, g_buf, sizeof(MSG), 0);
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if (ret <= 0)
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{
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printf("send failed, return is %d,i is %dn", ret, i);
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goto FAILURE;
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}
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printf("send finished ret is %dn", ret);
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/* send */
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/* recv */
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memset(g_buf, 0, BUF_SIZE);
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printf("going to call recvn");
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ret = recv(sfd, g_buf, sizeof(g_buf), 0);
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if (ret <= 0)
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{
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printf("recv failed, return is %dn", ret);
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goto FAILURE;
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}
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printf("recv succeeded, return is %dn", ret);
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printf("received msg is : %sn", g_buf);
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/* recv */
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lwip_close(sfd);
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return 0;
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FAILURE:
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lwip_close(sfd);
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// printf("errno is %dn", errno);
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return -1;
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}
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7.在电脑上用一个tcp工具,开启一个tcp的服务器,如图:8.把开发板上电,程序下载进去,经过调试之后,正常就应该会连到电脑上的tcp服务器,然后并自动发送14个字节的数据,如图:9.在电脑tcp服务器回复对应数据,可以在开发板终端上看到对应的数据,到此,本阶段实验结束,为后面的实验做铺垫.
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