【RA4E2开发板评测】——7.使用AT指令获取城市天气预报

使用ESP8266连接RA4E2开发板后，可以通过ESP8266连接WIFI网络，然后通过AT指令访问api.seniverse.com心知天气网站获取城市天气预报。
板子连接如下图所示：

硬件连线：

ESP-01S----------------------------------串口模块

3V3-----------------------------------------3V3

GND---------------------------------------GND

RX-------------------------------------------TX

TX--------------------------------------------RX

第一步，注册心知天气账户

官网心知天气 - 高精度气象数据 - 天气数据API接口 - 行业气象解决方案 (seniverse.com)

注册完成控制台获取免费版，在打开天气实况 (yuque.com)该地址获取接口地址

接口地址中：your_api_Key替换成心知天气的个人私钥，beijing替换成自己的城市，比如chengdu

第二步，编译代码烧录RA4E2后，打开串口助手，发送AT指令

1.复位模块

发送AT+RST

返回ready

2.测试AT指令

发送AT

返回OK

3.配置STA模式

发送AT+CWMODE=1

返回OK

4.连接wifi

发送AT+CWJAP="wifi名称","wifi密码"

返回OK

5.连接心知服务器

发送AT+CIPSTART="TCP","116.62.81.138",80

返回OK

8.使能esp8266透传模式

发送AT+CIPMODE=1 //0：禁止 1：使能

返回OK

9.开启数据传输

发送AT+CIPSEND

返回OK

10，获取天气

GET

最后得到天气

在这里需要使用CJSON进行数据解析，解析出天气预报中的有用信息
我的解析给是如下：

核心函数如下
#include "hal_data.h"
#include "Systick.h"
#include "usart0.h"
#include "usart9.h"
#include "usart_ring.h"
#include "esp8266.h"
#include "esp8266_io.h"
#include <stdio.h>
#include "app.h"
#include "cJSON.h"

FSP_CPP_HEADER
void R_BSP_WarmStart(bsp_warm_start_event_t event);
FSP_CPP_FOOTER

void ADC_TSN(void)
{
fsp_err_t err = FSP_SUCCESS;

/* Initializes the module. */
err = R_ADC_Open(&g_adc0_ctrl, &g_adc0_cfg);
/* Handle any errors. This function should be defined by the user. */
assert(FSP_SUCCESS == err);

/* Enable channels. */
err = R_ADC_ScanCfg(&g_adc0_ctrl, &g_adc0_channel_cfg);
assert(FSP_SUCCESS == err);

}

volatile bool scan_complete_flag = false;
void adc_callback (adc_callback_args_t * p_args)
{
FSP_PARAMETER_NOT_USED(p_args);
scan_complete_flag = true;
}
double a0,a5;
uint16_t adc_data1=0;
uint16_t adc_data2=0;

uint8_t txData;

char TX_Data[]="GET https://api.seniverse.com/v3/weather/now.json?key=SfobYsdsesesddsRce&location=shenzhen&language=zh-Hans&unit=c\r\n";
char Data[]="AT+CIPSEND\r\n";

/*******************************************************************************************************************//**

• main() is generated by the RA Configuration editor and is used to generate threads if an RTOS is used. This function

• is called by main() when no RTOS is used.
  **********************************************************************************************************************/
  void hal_entry(void)
  {
  esp8266_status_t status;
  fsp_err_t err = FSP_SUCCESS;
  fsp_err_t err1 = FSP_SUCCESS;
  uint16_t time = 0;

  uint8_t voltage_1 = 0;
  uint8_t voltage_2 = 0;
  static adc_info_t adc_info ;
  static double die_temperature = 0 ;
  static double V1 = 0;
  static double Vs = 0;
  uint32_t DataSize = 0;

  /* TODO: add your own code here */
  hal_systick_init();
  UART0_Init();UART9_Init();
  ADC_TSN();

  //esp8266_Init();
  /* Subscribe to a topic */
  //while(esp8266_mqtt_subscribe("iotled", 1));
  //HAL_Delay(200);

#if 1

printf("\r\nESP8266城市天气预报 \r\n\r\n");

	ESP8266_Init();
	while(ESP8266_SendCmd("AT+CIPSTART=\"TCP\",\"api.seniverse.com\",80\r\n", "OK"));
	
	//while(ESP8266_SendCmd("AT+CIPSTART=\"TCP\",\"api.openweathermap.org\",80\r\n", "OK"));
	
	while(ESP8266_SendCmd("AT+CIPMODE=1\r\n", "OK"));
	
	
	
	ESP8266_SendData(TX_Data,strlen(TX_Data));
	
	
	
	
	HAL_Delay(500);
	
	printf("%d\r\n",U2_Rxlen);
	printf("%d\r\n",strlen(U2_RxBuff));
	
	
	printf("原始天气数据\r\n");
	printf("*****************************************************************************\r\n");
	printf("%s\r\n",U2_RxBuff);
	printf("*****************************************************************************\r\n");
	
	
	
	//***********************************JSON解析数据
	cJSON *json;
	cJSON *Array_obj1;
	cJSON *Array_obj2;
	cJSON *Array_obj3;
	cJSON *Array_obj4;
	cJSON *Array_obj5;
	cJSON *Array_obj6;
	cJSON *Array_obj7;
	cJSON *Array_obj8;
	cJSON *Array;
	
	json = cJSON_Parse((const char *) U2_RxBuff );
	Array_obj1=cJSON_GetObjectItem(json,"results");
	
	int size=cJSON_GetArraySize(Array_obj1);
	//printf("\n%d",size);
	
	printf("\r\nCJSON解析后的数据\r\n");
	printf("=============================================================================\r\n");
	if(json == NULL)
	printf("\njson fmt error:%s\n.", cJSON_GetErrorPtr());
	else
	{
		Array=cJSON_GetArrayItem(Array_obj1,0);
		Array_obj2=cJSON_GetObjectItem(Array,"now");
		Array_obj3=cJSON_GetObjectItem(Array_obj2,"code");
		Array_obj4=cJSON_GetObjectItem(Array_obj2,"temperature");
		Array_obj5=cJSON_GetObjectItem(Array_obj2,"text");
		Array_obj6=cJSON_GetObjectItem(Array,"location");
		Array_obj7=cJSON_GetObjectItem(Array_obj6,"name");
		Array_obj8=cJSON_GetObjectItem(Array,"last_update");
		printf("城市: %s	 ",Array_obj7->valuestring);  
		printf("天气: %s	 ",Array_obj5->valuestring);
		//printf("\r\n%s\r\n",Array_obj3->valuestring); 				//天气代码
		printf("气温: %s度	  ",Array_obj4->valuestring);				//气温
		printf("时间: %s\r\n",Array_obj8->valuestring); 
	printf("=============================================================================\r\n");
	}
	
	cJSON_Delete(json);//释放json
	
	uart0_Send_String("+++");

#endif

#if 0
while (1)
{

(void) R_ADC_ScanStart(&g_adc0_ctrl);
   scan_complete_flag = false;
   while (!scan_complete_flag)
   {
	   
   }
   
   err = R_ADC_Read(&g_adc0_ctrl, ADC_CHANNEL_TEMPERATURE, &adc_data1);
   assert(FSP_SUCCESS == err);
   
   //Get ADC info
   err = R_ADC_InfoGet(&g_adc0_ctrl, &adc_info);
   assert(FSP_SUCCESS == err);
   
   //Die temperature formula according to TSN documentation: T = ( Vs - V1 ) / slope + 127 C
   V1 = ( 3.3 * (int) adc_info.calibration_data  ) / 4096 ;
   Vs = ( 3.3 * (int) adc_data1 ) / 4096 ;
   
   die_temperature = CONSTANT * ( Vs - V1 ) / ( adc_info.slope_microvolts ) + 127.0;
   
   static char string_die_temp[10] = {0};
   sprintf( string_die_temp, "%.2f", die_temperature  );
   
   printf("RA4E2 Sensor开发板芯片当前温度是: %s 度\r\n", string_die_temp);
   

   while(esp8266_mqtt_publish("RA4E2", string_die_temp, 1, 0));
   HAL_Delay(100);
   

}

#endif

#if BSP_TZ_SECURE_BUILD
/* Enter non-secure code */
R_BSP_NonSecureEnter();
#endif
}

/**

• [url=home.php?mod=space&uid=2666770]@Brief[/url] This function is executed in case of error occurrence.
• @retval None
  /
  void Error_Handler(void)
  {
  / USER CODE BEGIN Error_Handler_Debug /
  / User can add his own implementation to report the HAL error return state /
  __disable_irq();
  while (1)
  {
  }
  / USER CODE END Error_Handler_Debug */
  }

/*******************************************************************************************************************//**

• This function is called at various points during the startup process. This implementation uses the event that is

• called right before main() to set up the pins.

• @param[in] event Where at in the start up process the code is currently at
  **********************************************************************************************************************/
  void R_BSP_WarmStart (bsp_warm_start_event_t event)
  {
  if (BSP_WARM_START_RESET == event)
  {
  #if BSP_FEATURE_FLASH_LP_VERSION != 0

  /* Enable reading from data flash. */
   R_FACI_LP->DFLCTL = 1U;
  
   /* Would normally have to wait tDSTOP(6us) for data flash recovery. Placing the enable here, before clock and
    * C runtime initialization, should negate the need for a delay since the initialization will typically take more than 6us. */
  

#endif
}

if (BSP_WARM_START_POST_C == event)
{
    /* C runtime environment and system clocks are setup. */

    /* Configure pins. */
    R_IOPORT_Open(&IOPORT_CFG_CTRL, &IOPORT_CFG_NAME);

#if BSP_CFG_SDRAM_ENABLED

/* Setup SDRAM and initialize it. Must configure pins first. */
    R_BSP_SdramInit(true);

#endif
}
}

#if BSP_TZ_SECURE_BUILD

FSP_CPP_HEADER
BSP_CMSE_NONSECURE_ENTRY void template_nonsecure_callable ();

/* Trustzone Secure Projects require at least one nonsecure callable function in order to build (Remove this if it is not required to build). */
BSP_CMSE_NONSECURE_ENTRY void template_nonsecure_callable ()
{

}
FSP_CPP_FOOTER

#endif

打开串口助手，产看即可
1。先显示成都天气

城市: 成都 天气: 多云 气温: 29度 时间: 2025-09-03T12:40:02+08:00

打开手机App

城市: 成都 天气: 多云 气温: 29度 时间: 2025-09-03T12:40:02+08:00
和ESP8266解析的天气信息一模一样，非常的准确

2。换成深圳

char TX_Data[]="GET https://api.seniverse.com/v3/weather/now.json?key=SfobYffffgjL6dRce&location=shenzhen&language=zh-Hans&unit=c\r\n";

打开串口

城市: 深圳 天气: 多云 气温: 33度 时间: 2025-09-03T12:57:42+08:00

打开手机App

天气 预报一致

详情看视频