目录
前言:
一、串口程序的编写
1、串口重定向
2、回调函数
二、WiFi模块发送AT指令
esp01s.c
esp01s.h
三、数据处理
初始化
1、cjson的使用
2、字符串提取有用信息
3、转成标准时间
4.任务处理
前言:
前面讲解了使用AT指令获取网络时间与cjson的解析数据,本章综合将时间显示到屏幕
一、串口程序的编写
1、串口重定向
int fputc(int ch,FILE *f)
{//采用轮询方式发送1字节数据,超时时间设置为无限等待HAL_UART_Transmit(&huart1,(uint8_t *)&ch,1,HAL_MAX_DELAY);return ch;
}
int fgetc(FILE *f)
{uint8_t ch;// 采用轮询方式接收 1字节数据,超时时间设置为无限等待HAL_UART_Receive( &huart1,(uint8_t*)&ch,1, HAL_MAX_DELAY );return ch;
}
2、回调函数
uint8_t rx_dat;
char rxdata[256];
uint8_t rx_p = 0,rx_ppre = 0;
//串口中断接收数据
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{if(huart->Instance == USART1){if(rx_p >= sizeof(rxdata)) rx_p = 0; //防止串口被刷爆rxdata[rx_p ++] = rx_dat;HAL_UART_Receive_IT(&huart1,&rx_dat,1);}
}
二、WiFi模块发送AT指令
esp01s.c
#include "esp01s.h"
#include "usart.h"uint8_t rx_dat;
char rxdata[256];
uint8_t rx_p = 0,rx_ppre = 0;unsigned char Time_buff[100];int fputc(int ch,FILE *f)
{//采用轮询方式发送1字节数据,超时时间设置为无限等待HAL_UART_Transmit(&huart1,(uint8_t *)&ch,1,HAL_MAX_DELAY);return ch;
}
int fgetc(FILE *f)
{uint8_t ch;// 采用轮询方式接收 1字节数据,超时时间设置为无限等待HAL_UART_Receive( &huart1,(uint8_t*)&ch,1, HAL_MAX_DELAY );return ch;
}//串口中断接收数据
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{if(huart->Instance == USART1){if(rx_p >= sizeof(rxdata)) rx_p = 0; //防止串口被刷爆rxdata[rx_p ++] = rx_dat;HAL_UART_Receive_IT(&huart1,&rx_dat,1);}
}//清空缓存
void esp01s_clear(void)
{memset(rxdata,0,sizeof(rxdata));rx_p = 0;
}//esp01s等待接收完成 0成功 1失败
int esp01s_waitrecive(void)
{if(rx_p == 0) //如果接收计数为0 则说明没有处于接收数据中,所以直接跳出,结束函数return 1;if(rx_p == rx_ppre) //如果上一次的值和这次相同,则说明接收完毕{rx_p = 0; //清0接收计数return 0; //返回接收完成标志}rx_ppre = rx_p; //置为相同return 1; //返回接收未完成标志
}//esp01s发送指令 0成功 1失败
int esp01s_sendcmd(char *cmd,char *res)
{unsigned char timeout = 250;printf(cmd);while(timeout --){if(esp01s_waitrecive() == 0) //如果收到数据{if(strstr(rxdata,res) != NULL) //如果检索到关键词{esp01s_clear();return 0;}}HAL_Delay(10);}return 1;
}//esp01s发送数据
void esp01s_senddata(char *data)
{esp01s_clear(); //清空接收缓存if(!esp01s_sendcmd("AT+CIPSEND\r\n",">")) //收到‘>’时可以发送数据//printf(data);{/*发送请求数据*/printf(data); //发送设备连接请求数据HAL_GPIO_WritePin(led_blue_GPIO_Port,led_blue_Pin,GPIO_PIN_SET);}}unsigned char *ESP8266_GetIPD_GET(unsigned short timeOut, uint8_t *buff) //这里我用了一个全局变量将esp8266buf储存到这个全局变量里面
{do{HAL_Delay(5);}while(timeOut--);strcpy((char*)buff, (char*)rxdata);return buff;
}
esp01s.h
#ifndef __ESP01S_H
#define __ESP01S_H#include "main.h"
#include "string.h"
#include "stdio.h"extern uint8_t rx_dat;
extern char rxdata[256];
extern uint8_t rx_p,rx_ppre;
extern unsigned char Time_buff[100];void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart);
void esp01s_clear(void);
int esp01s_waitrecive(void);
int esp01s_sendcmd(char *cmd,char *res);
void esp01s_senddata(char *data);
unsigned char *ESP8266_GetIPD_GET(unsigned short timeOut, uint8_t *buff);#endif
三、数据处理
初始化
esp01s_clear();while(esp01s_sendcmd("+++",""));while(esp01s_sendcmd("AT\r\n", "OK"));while(esp01s_sendcmd("AT+RST\r\n", "OK"));while(esp01s_sendcmd("AT+CWMODE=1\r\n", "OK"));while(esp01s_sendcmd("AT+CIPMUX=0\r\n", "OK"));while(esp01s_sendcmd("AT+CWJAP=\"meng\",\"20010131\"\r\n", "WIFI GOT IP"));// while(esp01s_sendcmd("AT+CIPSTART=\"TCP\",\"api.seniverse.com\",80\r\n","CONNECT"));while(esp01s_sendcmd("AT+CIPSTART=\"TCP\",\"api.pinduoduo.com\",80\r\n","CONNECT"));while(esp01s_sendcmd("AT+CIPMODE=1\r\n", "OK"));
1、cjson的使用
void test1_jiexi()
{//解析// char jsondata[] = "{\"name\":\"menglingjun\",\"age\":21}";cJSON *json = NULL,*json_name = NULL,*json_age = NULL;json = cJSON_Parse((char *)te);//解析失败if(!json){}else{json_age = cJSON_GetObjectItem(json,"server_time");char *print1 = cJSON_Print(json_age);// lcd_showstr(5,0,(uint8 *)print1,WHITE);char *timestamp_start = strstr(print1,"17"); //字符串处理char timestamp[11];strncpy(timestamp, timestamp_start, 10);timestamp[10] = '\0'; int timestamp_cnt =atoi(timestamp);// sprintf(text,"%d",timestamp_cnt);// lcd_showstr(5,1,(uint8 *)text,WHITE);struct tm *timeinfo = localtime(×tamp_cnt);sprintf(text,"%d-%d-%d",timeinfo->tm_year + 1900,timeinfo->tm_mon + 1,timeinfo->tm_mday);lcd_showstr(5,2,(uint8 *)text,WHITE);sprintf(text,"%d:%d:%d",timeinfo->tm_hour+8,timeinfo->tm_min,timeinfo->tm_sec);lcd_showstr(10,3,(uint8 *)text,WHITE);free(print1);// 类型是数字// if(json_age->type == cJSON_Number)// {// // printf("age is %d\n",json_age->valueint);// sprintf(text,"%ld",json_age->valueint);// lcd_showstr(5,2,(uint8 *)text,WHITE);// u8g2_DrawStr(&u8g2,20,20,text);// }// json_name = cJSON_GetObjectItem(json,"name");// //类型是字符串// if(json_name->type == cJSON_String)// {// //printf("name is %s\n",json_age->valuestring);// lcd_showstr(0,1,(uint8 *)json_name->valuestring,WHITE);// }//释放内存cJSON_Delete(json);}
}
2、字符串提取有用信息
char *timestamp_start = strstr(print1,"17"); //字符串处理char timestamp[11];strncpy(timestamp, timestamp_start, 10);timestamp[10] = '\0'; int timestamp_cnt =atoi(timestamp);
3、转成标准时间
struct tm *timeinfo = localtime(×tamp_cnt);sprintf(text,"%d-%d-%d",timeinfo->tm_year + 1900,timeinfo->tm_mon + 1,timeinfo->tm_mday);lcd_showstr(5,2,(uint8 *)text,WHITE);sprintf(text,"%d:%d:%d",timeinfo->tm_hour+8,timeinfo->tm_min,timeinfo->tm_sec);lcd_showstr(10,3,(uint8 *)text,WHITE);
4.任务处理
u8g2_ClearBuffer(&u8g2);if(key[0].single_flag == 1){key[0].single_flag = 0;esp01s_senddata("GET http://api.pinduoduo.com/api/server/_stm\r\n");// esp01s_senddata("GET https://api.seniverse.com/v3/weather/daily.json?key=S6H95GCCwULqmbSE8&location=weifang&language=en&unit=c&start=-1&days=5\r\n");te = ESP8266_GetIPD_GET(200, Time_buff); //将串口数据取出来esp01s_clear();//清除缓存数据while(esp01s_sendcmd("+++", "")); /*退出透传模式,发送两次*/}// lcd_showstr(0,0,(uint8 *)rxdata,WHITE);test1_jiexi();u8g2_SendBuffer(&u8g2);// lcd_clear(BLACK);