本文链接： https://blog.csdn.net/qq_36347513/article/details/98869650

一、相关函数

WIFI 接口位于 ESP8266_NONOS_SDK/include/user_interface.h。

二、直接设置IP

struct ip_info info;
IP4_ADDR(&info.ip,192,168,0,18);
IP4_ADDR(&info.gw,192,168,0,1);
IP4_ADDR(&info.netmask,255,255,255,0);
wifi_station_dhcpc_stop();
wifi_set_ip_info(STATION_IF,&info); // 设置sta模式的IP

注意： 设置静态 IP，请先关闭对应 DHCP 功能 wifi_station_dhcpc_stop 或者
wifi_softap_dhcps_stop 因为DHCP开启，则静态IP失效，而DHCP默认开启。

二、从Flash中读取

2.1 初次DHCP分配IP

首先连接AP，由DHCP动态分配IP地址

/**
 @brief 配置STA模式属性
 @param pSsid -[in] 要接入的WIFI名字
 @param pPassword -[in] 要连入的WIFI密码
 @return 无
*/
void ICACHE_FLASH_ATTR
ConfigStationMode(char *pSsid, char *pPassword)
{
	if(!pSsid || !pPassword)
	{
		return ;
	}

	struct station_config station;
	uint8 wifiMode = wifi_get_opmode();

	if((wifiMode == STATION_MODE) || (wifiMode == STATIONAP_MODE))
	{
		os_strcpy(station.ssid, pSsid);
		os_strcpy(station.password, pPassword);
		wifi_station_set_config(&station);
		wifi_station_disconnect();
		wifi_station_connect();
	}
}

char ssid[32] = "test";
char password = "12345678";
ConfigStationMode(ssid, password);

2.2 保存IP地址

开一个定时器 startCheckWifiModeTimer() 检测网络连接状态，并保存IP地址

typedef struct dhcpClientInfo_t
{
    ip_addr_t ip;
    ip_addr_t netmask;
    ip_addr_t gw;
    uint8 flag;
    uint8 pad[3];
} DhcpClientInfo_t;

const uint16 CHECK_WIFI_MODE_PERIOD	= 1000;
static os_timer_t s_checkWifiModeTime;    // 检查WIFI工作模式的定时器

/**
 @brief 开始检查WIFI工作模式的定时器
 @param 无
 @return 无
*/
static void ICACHE_FLASH_ATTR
startCheckWifiModeTimer(void)
{
	os_timer_disarm(&s_checkWifiModeTimer);
	os_timer_setfn(&s_checkWifiModeTimer, (os_timer_func_t *) checkWifiModeTimerCallback, NULL);
	os_timer_arm(&s_checkWifiModeTimer, CHECK_WIFI_MODE_PERIOD, true);
}

/**
 @brief 检查WIFI工作模式定时器的回调函数
 @param 无
 @return 无
*/
static void ICACHE_FLASH_ATTR
checkWifiModeTimerCallback(void)
{
    struct ip_info ipInfo;
    wifi_get_ip_info(STATION_IF, &ipInfo);
    uint8 wifiStationConnectStatus = wifi_station_get_connect_status();	// WIFI STA模式连接状态
    if(wifiStationConnectStatus == STATION_GOT_IP && ipInfo.ip.addr != 0)
    {
        dhcpClientSave(ipInfo);
    }
}

/**
 @brief DHCP客户端保存
 @param ipInfo - [in] IP信息
 @return 无
*/
static void ICACHE_FLASH_ATTR
dhcpClientSave(struct ip_info ipInfo)
{
	static DhcpClientInfo_t s_dhcpInfo;

	if(s_dhcpInfo.flag != 0x01)
	{
		s_dhcpInfo.flag = 0x01;
		s_dhcpInfo.ip = ipInfo.ip;
		s_dhcpInfo.netmask = ipInfo.netmask;
		s_dhcpInfo.gw = ipInfo.gw;

		system_param_save_with_protect(priv_param_start_sec + 1, &s_dhcpInfo, sizeof(s_dhcpInfo));
	}
}

2.3 再次启动，读取IP设为静态IP

struct ip_info ipInfo;
wifi_get_ip_info(STATION_IF, &ipInfo);
uint8 wifiStationConnectStatus = wifi_station_get_connect_status();				// WIFI STA模式连接状态
static bool s_dhcpClientInitFlag;

if(wifiStationConnectStatus == STATION_GOT_IP && ipInfo.ip.addr != 0)
{
    if(s_dhcpClientInitFlag == false)
    {
        dhcpClientInit();
        s_dhcpClientInitFlag = true;
    }
}

/**
 @brief DHCP客户端初始化
 @param 无
 @return 无
*/
static void ICACHE_FLASH_ATTR
dhcpClientInit(void)
{
	DhcpClientInfo_t dhcpInfo;
	struct ip_info ipInfo;

	system_param_load(priv_param_start_sec + 1, 0, &dhcpInfo, sizeof(dhcpInfo));;

	if(dhcpInfo.flag == 0x01)
	{
		if(wifi_station_dhcpc_status() == DHCP_STARTED)
		{
			wifi_station_dhcpc_stop();
		}

		ipInfo.ip = dhcpInfo.ip;
		ipInfo.gw = dhcpInfo.gw;
		ipInfo.netmask = dhcpInfo.netmask;
		os_printf("default ip:"IPSTR"\n",IP2STR(&ipInfo.ip));
		os_printf("default netmask:"IPSTR"\n",IP2STR(&ipInfo.netmask));
		os_printf("default gw:"IPSTR"\n",IP2STR(&ipInfo.gw));

		if(wifi_set_ip_info(STATION_IF, &ipInfo) == false)
		{
			os_printf("Err:set default ip wrong\n");
		}
	}
}

2.4 注意

开机由于 wifi_station_set_auto_connect(1) 会自动连接上次路由，然后开启DHCP客户端动态获取IP，在此之前调用 wifi_station_dhcpc_stop() 无效，所以 wifi_set_ip_info() 也会无效。

应该在打印dhcp client start…之后再设置静态IP

• 由 Leung 写于 2019 年 8 月 8 日

• 参考：ESP8266 Non-OS SDK API参考[7qq6]

ESP8266学习笔记（12）——设置静态IP