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摘要：本文简单介绍Hi3861WiFi操作，怎么连接到热点，查看IP，ping服务器等
适合群体：适用于润和Hi3861开发板
文中所有代码仓库：https://gitee.com/qidiyun/hihope-3861-smart-home-kit
9.1AT指令操作WiFi
我们可以使用AT指令进行Hi3861 WiFi操作，连接热点、ping服务器等。
但是很多时候，我们需要实现开机后自动连接到某个热点，光靠AT指令不行。
Hi3861 为我们提供了WiFi操作的相关API，方便我们编写代码，实现热点连接。
9.2 代码实现
先直接上代码和操作演示。
跟我们最早的hello world代码一样，在app下新增业务demo_wifi_sta，其中demo_wifi_sta.c为业务代码，BUILD.gn为编译脚本，具体规划目录结构如下：
其中BUILD.gn文件内容如下：
static_library("demo_wifi_sta") {
sources = [
"demo_wifi_sta.c"
]
include_dirs = [
"//utils/native/lite/include",
"//kernel/liteos_m/components/cmsis/2.0",
"//base/iot_hardware/peripheral/interfaces/kits",
"//device/soc/hisilicon/hi3861v100/hi3861_adapter/hals/communication/wifi_lite/wifiservice",
"//device/soc/hisilicon/hi3861v100/hi3861_adapter/kal",
"//device/soc/hisilicon/hi3861v100/sdk_liteos/third_party/lwip_sack/include",
]
}hi_wifi_start_sta函数：设置WiFi参数、扫描热点
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;
//这里不需要重复进行WiFi init，因为系统启动后就自己会做WiFi init
#if 0
printf("_______>>>>>>>>>> %s %d \r\n", __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\n");
}
/* acquire netif for IP operation */
g_lwip_netif = netifapi_netif_find(ifname);
if (g_lwip_netif == NULL) {
printf("%s: get netif failed\n", __FUNCTION__);
return -1;
}
/* 开始扫描附件的WiFi热点 */
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;
}
//把扫描到的热点结果存储起来
ret = hi_wifi_sta_scan_results(pst_results, &num);
if (ret != HISI_OK) {
free(pst_results);
return -1;
}
//打印扫描到的所有热点
for (unsigned int loop = 0; (loop < num) && (loop < WIFI_SCAN_AP_LIMIT); loop++) {
printf("SSID: %s\n", pst_results[loop].ssid);
}
free(pst_results);
/* 开始接入热点 */
ret = hi_wifi_start_connect();
if (ret != 0) {
return -1;
}
return 0;
}
连接热点：
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;
}
//热点加密方式
assoc_req.auth = HI_WIFI_SECURITY_WPA2PSK;
/* 热点密码 */
memcpy(assoc_req.key, "07686582488", 11);
ret = hi_wifi_sta_connect(&assoc_req);
if (ret != HISI_OK) {
return -1;
}
return 0;
}
热点连接结果回调函数
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\n");
break;
case HI_WIFI_EVT_CONNECTED:
printf("WiFi: Connected\n");
netifapi_dhcp_start(g_lwip_netif);
break;
case HI_WIFI_EVT_DISCONNECTED:
printf("WiFi: Disconnected\n");
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\n");
break;
default:
break;
}
}
hi_sta_reset_addr：重新复位sta的地址、网关等参数。
/* 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\r\n");
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);
}
9.3 WiFi相关API
Hi3861 提供了非常多的wifi相关API，主要文件是 hi_wifi_api.h
我们这里只列举最重要的几个API
(1)开启STA
int hi_wifi_sta_start(char *ifname, int *len);
(2)停止STA
int hi_wifi_sta_stop(void);
(3)扫描附件的热点
int hi_wifi_sta_scan(void);
(4)连接热点
int hi_wifi_sta_connect(hi_wifi_assoc_request *req);
其中hi_wifi_assoc_request *req 结构的定义如下：
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: 认证类型.CNend */
char key[HI_WIFI_MAX_KEY_LEN + 1]; /**< Secret key. CNcomment: 秘钥.CNend */
unsigned char bssid[HI_WIFI_MAC_LEN]; /**< BSSID. CNcomment: BSSID.CNend */
hi_wifi_pairwise pairwise; /**< Encryption type. CNcomment: 加密方式,不需指定时置0.CNend */
} hi_wifi_assoc_request;这里需要注意的是，通常加密方式是：HI_WIFI_SECURITY_WPA2PSK
例如我家的热点的连接方式的代码实现如下：
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;
}
//热点加密方式
assoc_req.auth = HI_WIFI_SECURITY_WPA2PSK;
/* 热点密码 */
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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