摘要

本文簡(jiǎn)單介紹Hi3861WiFi操作，怎么連接到熱點(diǎn)，查看IP，ping服務(wù)器等。

適合群體

適用于潤(rùn)和Hi3861開發(fā)板的開發(fā)。

1、AT指令操作WiFi

我們可以使用AT指令進(jìn)行Hi3861 WiFi操作，連接熱點(diǎn)、ping服務(wù)器等。

但是很多時(shí)候，我們需要實(shí)現(xiàn)開機(jī)后自動(dòng)連接到某個(gè)熱點(diǎn)，光靠AT指令不行。

Hi3861 為我們提供了WiFi操作的相關(guān)API，方便我們編寫代碼，實(shí)現(xiàn)熱點(diǎn)連接。

2、代碼實(shí)現(xiàn)

先直接上代碼和操作演示，跟我們最早的hello world代碼一樣，在app下新增業(yè)務(wù)demo_wifi_sta，其中demo_wifi_sta.c為業(yè)務(wù)代碼，BUILD.gn為編譯腳本，具體規(guī)劃目錄結(jié)構(gòu)如下：

其中BUILD.gn文件內(nèi)容如下：

static_library("demo_wifi_sta") {  sources = [    "demo_wifi_sta.c"  ]
  include_dirs = [    "http://utils/native/lite/include",    "http://kernel/liteos_m/components/cmsis/2.0",    "http://base/iot_hardware/peripheral/interfaces/kits",    "http://device/soc/hisilicon/hi3861v100/hi3861_adapter/hals/communication/wifi_lite/wifiservice",    "http://device/soc/hisilicon/hi3861v100/hi3861_adapter/kal",    "http://device/soc/hisilicon/hi3861v100/sdk_liteos/third_party/lwip_sack/include",  ]}

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hi_wifi_start_sta函數(shù)：設(shè)置WiFi參數(shù)、掃描熱點(diǎn)

int hi_wifi_start_sta(void){  int ret;  char ifname[WIFI_IFNAME_MAX_SIZE + 1] = {0};  int len = sizeof(ifname);  const unsigned char wifi_vap_res_num = APP_INIT_VAP_NUM;  const unsigned char wifi_user_res_num = APP_INIT_USR_NUM;  unsigned int num = WIFI_SCAN_AP_LIMIT;
  //這里不需要重復(fù)進(jìn)行WiFi init，因?yàn)橄到y(tǒng)啟動(dòng)后就自己會(huì)做WiFi init#if 0  printf("_______>>>>>>>>>> %s %d 
", __FILE__, __LINE__);  ret = hi_wifi_init(wifi_vap_res_num, wifi_user_res_num);  if (ret != HISI_OK) {    return -1;  }#endif  ret = hi_wifi_sta_start(ifname, &len);  if (ret != HISI_OK) {    return -1;  }
  /* register call back function to receive wifi event, etc scan results event,   * connected event, disconnected event.   */  ret = hi_wifi_register_event_callback(wifi_wpa_event_cb);  if (ret != HISI_OK) {    printf("register wifi event callback failed
");  }
  /* acquire netif for IP operation */  g_lwip_netif = netifapi_netif_find(ifname);  if (g_lwip_netif == NULL) {    printf("%s: get netif failed
", __FUNCTION__);    return -1;  }
  /* 開始掃描附件的WiFi熱點(diǎn) */  ret = hi_wifi_sta_scan();  if (ret != HISI_OK) {    return -1;  }
  sleep(5);  /* sleep 5s, waiting for scan result. */
  hi_wifi_ap_info *pst_results = malloc(sizeof(hi_wifi_ap_info) * WIFI_SCAN_AP_LIMIT);  if (pst_results == NULL) {    return -1;  }
  //把掃描到的熱點(diǎn)結(jié)果存儲(chǔ)起來(lái)  ret = hi_wifi_sta_scan_results(pst_results, &num);  if (ret != HISI_OK) {    free(pst_results);    return -1;  }
  //打印掃描到的所有熱點(diǎn)  for (unsigned int loop = 0; (loop < num) && (loop < WIFI_SCAN_AP_LIMIT); loop++) {    printf("SSID: %s
", pst_results[loop].ssid);  }  free(pst_results);
  /* 開始接入熱點(diǎn) */  ret = hi_wifi_start_connect();  if (ret != 0) {    return -1;  }  return 0;}

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連接熱點(diǎn)：

int hi_wifi_start_connect(void){  int ret;  errno_t rc;  hi_wifi_assoc_request assoc_req = {0};
  /* copy SSID to assoc_req */  rc = memcpy_s(assoc_req.ssid, HI_WIFI_MAX_SSID_LEN + 1, "RedmiK40", 8); /* 9:ssid length */  if (rc != EOK) {    return -1;  }
  //熱點(diǎn)加密方式  assoc_req.auth = HI_WIFI_SECURITY_WPA2PSK;
  /* 熱點(diǎn)密碼 */  memcpy(assoc_req.key, "07686582488", 11);
  ret = hi_wifi_sta_connect(&assoc_req);  if (ret != HISI_OK) {    return -1;  }
  return 0;}

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熱點(diǎn)連接結(jié)果回調(diào)函數(shù)

void wifi_wpa_event_cb(const hi_wifi_event *hisi_event){  if (hisi_event == NULL)    return;
  switch (hisi_event->event) {    case HI_WIFI_EVT_SCAN_DONE:      printf("WiFi: Scan results available
");      break;    case HI_WIFI_EVT_CONNECTED:      printf("WiFi: Connected
");      netifapi_dhcp_start(g_lwip_netif);      break;    case HI_WIFI_EVT_DISCONNECTED:      printf("WiFi: Disconnected
");      netifapi_dhcp_stop(g_lwip_netif);      hi_sta_reset_addr(g_lwip_netif);      break;    case HI_WIFI_EVT_WPS_TIMEOUT:      printf("WiFi: wps is timeout
");      break;    default:      break;  }}

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hi_sta_reset_addr：重新復(fù)位sta的地址、網(wǎng)關(guān)等參數(shù)。

/* clear netif's ip, gateway and netmask */void hi_sta_reset_addr(struct netif *pst_lwip_netif){  ip4_addr_t st_gw;  ip4_addr_t st_ipaddr;  ip4_addr_t st_netmask;
  if (pst_lwip_netif == NULL) {    printf("hisi_reset_addr::Null param of netdev
");    return;  }
  IP4_ADDR(&st_gw, 0, 0, 0, 0);  IP4_ADDR(&st_ipaddr, 0, 0, 0, 0);  IP4_ADDR(&st_netmask, 0, 0, 0, 0);
  netifapi_netif_set_addr(pst_lwip_netif, &st_ipaddr, &st_netmask, &st_gw);}

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3、WiFi相關(guān)API

Hi3861 提供了非常多的wifi相關(guān)API，主要文件是 hi_wifi_api.h，我們這里只列舉最重要的幾個(gè)API

（1）開啟STA

int hi_wifi_sta_start(char *ifname, int *len);

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（2）停止STA

int hi_wifi_sta_stop(void);

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（3）掃描附件的熱點(diǎn)

int hi_wifi_sta_scan(void);

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（4）連接熱點(diǎn)

int hi_wifi_sta_connect(hi_wifi_assoc_request *req);

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其中hi_wifi_assoc_request *req 結(jié)構(gòu)的定義如下：

typedef struct {  char ssid[HI_WIFI_MAX_SSID_LEN + 1];  /**< SSID. CNcomment: SSID 只支持ASCII字符.CNend */  hi_wifi_auth_mode auth;         /**< Authentication mode. CNcomment: 認(rèn)證類型.CNend */  char key[HI_WIFI_MAX_KEY_LEN + 1];   /**< Secret key. CNcomment: 秘鑰.CNend */  unsigned char bssid[HI_WIFI_MAC_LEN];  /**< BSSID. CNcomment: BSSID.CNend */  hi_wifi_pairwise pairwise;       /**< Encryption type. CNcomment: 加密方式,不需指定時(shí)置0.CNend */} hi_wifi_assoc_request;

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這里需要注意的是，通常加密方式是：HI_WIFI_SECURITY_WPA2PSK

例如我家的熱點(diǎn)的連接方式的代碼實(shí)現(xiàn)如下：

int hi_wifi_start_connect(void){  int ret;  errno_t rc;  hi_wifi_assoc_request assoc_req = {0};
  /* copy SSID to assoc_req */  rc = memcpy_s(assoc_req.ssid, HI_WIFI_MAX_SSID_LEN + 1, "RedmiK40", 8); /* 9:ssid length */  if (rc != EOK) {    return -1;  }
  //熱點(diǎn)加密方式  assoc_req.auth = HI_WIFI_SECURITY_WPA2PSK;
  /* 熱點(diǎn)密碼 */  memcpy(assoc_req.key, "07686582488", 11);
  ret = hi_wifi_sta_connect(&assoc_req);  if (ret != HISI_OK) {    return -1;  }
  return 0;}

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本小節(jié)文章就到這里了，后續(xù)文章會(huì)持續(xù)更新，歡迎大家持續(xù)關(guān)注哦~

原文標(biāo)題：OpenHarmony輕量系統(tǒng)開發(fā)【9】WiFi之STA模式連接熱點(diǎn)