ESP32通过程序从闪存文件系统(SPIFFS)读取信息

Posted 2021-09-15 perseverance52

ESP32通过程序从闪存文件系统(SPIFFS)读取信息

• 开发板型号： ESP32-Dev-Module

实例程序

#include "SPIFFS.h"
void setup() {

   Serial.begin(115200);
   if(!SPIFFS.begin()){
        Serial.println("初始化SPIFFS失败！");
        return;
   }
    File file = SPIFFS.open("/text.txt");
    if(!file){
        Serial.println("无法打开文件进行读取");
        return;
    }

    Serial.println("文件内容:");

    while(file.available()){

        Serial.write(file.read());
    }

    file.close();
}

void loop() {}

• 在项目文件夹下建立一个date文件夹，在里面放置需要上传的文件
  
• 在date文件夹下，我存放了一个名为：text.txt的文件，内容：

{"code":"200","updateTime":"2021-08-24T20:35+08:00","fxLink":"http://hfx.link/3ep1","daily":[{"fxDate":"2021-08-24","sunrise":"06:01","sunset":"18:56","moonrise":"20:21","moonset":"08:23","moonPhase":"Waning gibbous","tempMax":"34","tempMin":"25","iconDay":"305","textDay":"Light Rain","iconNight":"154","textNight":"Overcast","wind360Day":"330","windDirDay":"NW","windScaleDay":"3-4","windSpeedDay":"13","wind360Night":"225","windDirNight":"SW","windScaleNight":"1-2","windSpeedNight":"3","humidity":"96","precip":"1.0","pressure":"990","vis":"24","cloud":"55","uvIndex":"5"},{"fxDate":"2021-08-25","sunrise":"06:01","sunset":"18:55","moonrise":"20:52","moonset":"09:18","moonPhase":"Waning gibbous","tempMax":"31","tempMin":"25","iconDay":"305","textDay":"Light Rain","iconNight":"305","textNight":"Light Rain","wind360Day":"45","windDirDay":"NE","windScaleDay":"1-2","windSpeedDay":"3","wind360Night":"225","windDirNight":"SW","windScaleNight":"1-2","windSpeedNight":"3","humidity":"98","precip":"1.0","pressure":"994","vis":"10","cloud":"55","uvIndex":"9"},{"fxDate":"2021-08-26","sunrise":"06:02","sunset":"18:54","moonrise":"21:23","moonset":"10:12","moonPhase":"Waning gibbous","tempMax":"31","tempMin":"23","iconDay":"305","textDay":"Light Rain","iconNight":"305","textNight":"Light Rain","wind360Day":"45","windDirDay":"NE","windScaleDay":"1-2","windSpeedDay":"3","wind360Night":"180","windDirNight":"S","windScaleNight":"1-2","windSpeedNight":"3","humidity":"97","precip":"5.1","pressure":"996","vis":"17","cloud":"80","uvIndex":"4"}],"refer":{"sources":["Weather China"],"license":["no commercial use"]}}

程序编译和上传文件上传。

• 第一步，程序编译上传。

• 第二步，闪存文件上传。(注意上传闪存文件时，不要打开串口，否则会报错)
  

• 串口打印读取的闪存文件信息。（连续读取的，信息很长，部分内容截图）