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[文章]【HarmonyOS开发板试用】IOT板子连接wifi

PCB62304753
2021-03-14 20:49:01
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HarmonyOS
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最开始使用Hi3861的时候，是使用AT指令去控制wifi的状态。不过在实际使用中，如果使用AT指令需要额外使用一个芯片去控制，很不方便。
Hi3861 为我们提供了很多wifi操作的API，可以通过调用这些API完成对wifi的扫描连接等操作。
主要代码如下：
  1. #include <stdio.h>
  2. #include <unistd.h>
  3. #include "ohos_init.h"
  4. #include "cmsis_os2.h"
  5. #include <unistd.h>
  6. #include "hi_wifi_api.h"
  7. #include "lwip/ip_addr.h"
  8. #include "lwip/netifapi.h"

  10. #define APP_INIT_VAP_NUM    2
  11. #define APP_INIT_USR_NUM    2

  13. #define SSID_NAME     需要连接的wifi的名称
  14. #define SSID_PASSWORD 需要连接的wifi的密码

  16. static struct netif *g_lwip_netif = NULL;

  18. /* 清除netif的ip、网关和网络掩码 */
  19. void hi_sta_reset_addr(struct netif *pst_lwip_netif)
  20. {
  21.     ip4_addr_t st_gw;
  22.     ip4_addr_t st_ipaddr;
  23.     ip4_addr_t st_netmask;
  24.     printf("%s %d rn", __FILE__, __LINE__);
  25.     if (pst_lwip_netif == NULL) {
  26.         printf("hisi_reset_addr::Null param of netdevrn");
  27.         return;
  28.     }

  30.     IP4_ADDR(&st_gw, 0, 0, 0, 0);
  31.     IP4_ADDR(&st_ipaddr, 0, 0, 0, 0);
  32.     IP4_ADDR(&st_netmask, 0, 0, 0, 0);

  34.     netifapi_netif_set_addr(pst_lwip_netif, &st_ipaddr, &st_netmask, &st_gw);
  35. }

  37. void wifi_wpa_event_cb(const hi_wifi_event *hisi_event)
  38. {
  39.     if (hisi_event == NULL)
  40.         return;

  42.     switch (hisi_event->event) {
  43.         case HI_WIFI_EVT_SCAN_DONE:
  44.             printf("WiFi: Scan results availablen");
  45.             break;
  46.         case HI_WIFI_EVT_CONNECTED:
  47.             printf("WiFi: Connectedn");
  48.             netifapi_dhcp_start(g_lwip_netif);
  49.             break;
  50.         case HI_WIFI_EVT_DISCONNECTED:
  51.             printf("WiFi: Disconnectedn");
  52.             netifapi_dhcp_stop(g_lwip_netif);
  53.             hi_sta_reset_addr(g_lwip_netif);
  54.             break;
  55.         case HI_WIFI_EVT_WPS_TIMEOUT:
  56.             printf("WiFi: wps is timeoutn");
  57.             break;
  58.         default:
  59.             break;
  60.     }
  61. }

  63. int hi_wifi_start_connect(void)
  64. {
  65.     int ret;
  66.     errno_t rc;
  67.     hi_wifi_assoc_request assoc_req = {0};

  69.     /* 将SSID复制到assoc_req */
  70.     rc = memcpy_s(assoc_req.ssid, HI_WIFI_MAX_SSID_LEN + 1, SSID_NAME, strlen(SSID_NAME));
  71.     if (rc != EOK) {
  72.         printf("%s %d rn", __FILE__, __LINE__);
  73.         return -1;
  74.     }

  76.     //热点加密方式
  77.     assoc_req.auth = HI_WIFI_SECURITY_WPA2PSK;

  79.     /* 热点密码 */
  80.     memcpy(assoc_req.key, SSID_PASSWORD, strlen(SSID_PASSWORD));


  83.     ret = hi_wifi_sta_connect(&assoc_req);
  84.     if (ret != HISI_OK) {
  85.         printf("%s %d rn", __FILE__, __LINE__);
  86.         return -1;
  87.     }
  88.     printf("%s %d rn", __FILE__, __LINE__);
  89.     return 0;
  90. }

  92. int hi_wifi_start_sta(void)
  93. {
  94.     int ret;
  95.     char ifname[WIFI_IFNAME_MAX_SIZE + 1] = {0};
  96.     int len = sizeof(ifname);
  97.     const unsigned char wifi_vap_res_num = APP_INIT_VAP_NUM;
  98.     const unsigned char wifi_user_res_num = APP_INIT_USR_NUM;
  99.     unsigned int  num = WIFI_SCAN_AP_LIMIT;

  101.     printf("%s %d rn", __FILE__, __LINE__);

  103.     ret = hi_wifi_init(wifi_vap_res_num, wifi_user_res_num);
  104.     if (ret != HISI_OK) {
  105.         printf("%s %d rn", __FILE__, __LINE__);
  106.         //return -1;
  107.     }

  109.     printf("%s %d rn", __FILE__, __LINE__);
  110.     ret = hi_wifi_sta_start(ifname, &len);
  111.     if (ret != HISI_OK) {
  112.         printf("%s %d rn", __FILE__, __LINE__);
  113.         return -1;
  114.     }

  116.     /* 注册回拨功能，接收wifi事件、etc扫描结果事件、已连接事件、已断开连接事件 */
  117.     ret = hi_wifi_register_event_callback(wifi_wpa_event_cb);
  118.     if (ret != HISI_OK) {
  119.         printf("register wifi event callback faiLEDn");
  120.     }

  122.     /* 获取用于IP操作的netif */
  123.     g_lwip_netif = netifapi_netif_find(ifname);
  124.     if (g_lwip_netif == NULL) {
  125.         printf("%s: get netif failedn", __FUNCTION__);
  126.         return -1;
  127.     }

  129.     /* 开始扫描，扫描结果事件将很快收到 */
  130.     ret = hi_wifi_sta_scan();
  131.     if (ret != HISI_OK) {
  132.         printf("%s %d rn", __FILE__, __LINE__);
  133.         return -1;
  134.     }

  136.     sleep(5);   /* 睡眠5秒，等待扫描结果 */

  138.     hi_wifi_ap_info *pst_results = malloc(sizeof(hi_wifi_ap_info) * WIFI_SCAN_AP_LIMIT);
  139.     if (pst_results == NULL) {
  140.         printf("%s %d rn", __FILE__, __LINE__);
  141.         return -1;
  142.     }

  144.     ret = hi_wifi_sta_scan_results(pst_results, &num);
  145.     if (ret != HISI_OK) {
  146.         printf("%s %d rn", __FILE__, __LINE__);
  147.         free(pst_results);
  148.         return -1;
  149.     }

  151.     for (unsigned int loop = 0; (loop < num) && (loop < WIFI_SCAN_AP_LIMIT); loop++) {
  152.         printf("SSID: %sn", pst_results[loop].ssid);
  153.     }
  154.     free(pst_results);

  156.     /* 如果收到扫描结果，请选择一个要连接的SSID */
  157.     ret = hi_wifi_start_connect();
  158.     if (ret != 0) {
  159.         printf("%s %d rn", __FILE__, __LINE__);
  160.         return -1;
  161.     }


  164.     return 0;
  165. }

  167. void hi_wifi_stop_sta(void)
  168. {
  169.     int ret;

  171.     ret = hi_wifi_sta_stop();
  172.     if (ret != HISI_OK) {
  173.         printf("failed to stop stan");
  174.     }

  176.     ret = hi_wifi_deinit();
  177.     if (ret != HISI_OK) {
  178.         printf("failed to deinit wifin");
  179.     }

  181.     g_lwip_netif = NULL;

  183.    
  184. }

  186. void WiFiExampleEntry(void)
  187. {
  188.     hi_wifi_start_sta();
  189. }

  191. SYS_RUN(WiFiExampleEntry);
复制代码
运行之后log如下
  1. ready to OS start

  3. sdk ver:Hi3861V100R001C00SPC025 2020-09-03 18:10:00

  5. formatting spiffs...
  6. FileSystem mount ok.
  7. wifi init success!
  8. ../../applications/sample/wifi-iot/app/wifi_demo/wifi_demo.c 111

  10. ../../applications/sample/wifi-iot/app/wifi_demo/wifi_demo.c 115

  12. ../../applications/sample/wifi-iot/app/wifi_demo/wifi_demo.c 119


  15. +NOTICE:SCANFINISH
  16. WiFi: Scan results available
  17. SSID: ChinaNet-9qDC
  18. SSID: SuperSpeedTurbo
  19. SSID:
  20. SSID:
  21. SSID: 浜嶱HICOMM_F1
  22. SSID: CMCC-TnpK
  23. SSID: Lenovo Wi-Fi AP R3200
  24. SSID: st
  25. SSID: ChinaNet-3MFk
  26. SSID:
  27. SSID: ChinaNet-yLWz
  28. SSID: CU_HAfG
  29. SSID: ChinaNet-bwEU
  30. SSID: Tenda_445420
  31. SSID: CU_9JXc
  32. SSID: FAST_4EAC
  33. SSID: @PHICOMM_35
  34. SSID: 瀛欐垚鎴愭槸瀚╃埞
  35. SSID: 绫冲
  36. ../../applications/sample/wifi-iot/app/wifi_demo/wifi_demo.c 98

  38. 00 00:00:00 0 196 D 0/HIVIEW: hilog init success.
  39. 00 00:00:00 0 196 D 0/HIVIEW: log limit init success.
  40. 00 00:00:00 0 196 I 1/SAMGR: Bootstrap core services(count:3).
  41. 00 00:00:00 0 196 I 1/SAMGR: Init service:0x4aea5c TaskPool:0xfc3e8
  42. 00 00:00:00 0 196 I 1/SAMGR: Init service:0x4aea80 TaskPool:0xfc408
  43. 00 00+NOTICE:CONNECTED
  44. :00:00 0 196 I 1/SAMGR: Init service:0x4aeb90 TaskPool:0xfc7bc
  45. 00 00:00:00 0 228 I 1/SAMGR: Init service 0x4aea80 <time: 5570ms> success!
  46. 00 00:00:00 0 28 I 1/SAMGR: Init service 0x4aea5c <time: 5570ms> success!
  47. 00 00:00:00 0 72 D 0/HIVIEW: hiview init success.
  48. 00 00:00:00 0 72 I 1/SAMGR: Init service 0x4aeb90 <time: 5570ms> success!
  49. 00 00:00:00 0 72 I 1/SAMGR: Initialized all core system services!
  50. 00 00:00:00 0 28 I 1/SAMGR: Bootstrap system and application services(count:0).
  51. 00 00:00:00 0 28 I 1/SAMGR: Initialized all system and application services!
  52. 00 00:00:00 0 28 I 1/SAMGR: Bootstrap dynamic registered services(count:0).
  53. WiFi: Connected
复制代码
其中最后打印的WiFi: Connected代表已经成功连接到wifi

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