arduino sd卡g代码_arduino读取u盘「建议收藏」

硬件准备

SD卡模块

接线

方法一

Arduino UNO GPIO接法

方法二

SPI接法 （适合UNO Mega2560等）
Arduino UNO SPI引脚图


Mega 2560 SPI接法

库文件准备

SD卡模块需要这两个库

#include <SPI.h>
#include <SD.h>

SD卡库文件下载
将下载好的库文件解压放到

代码部分

// 加载SD库
#include <SPI.h>
#include <SD.h> 

// 使用SD实用程序库函数设置变量：
Sd2Card card;
SdVolume volume;
SdFile root;

const int chipSelect = 4;
 
void setup() { 
   
  Serial.begin(9600);
  while (!Serial) { 
   
    ;
  }
  Serial.print("\nInitializing SD card...");
  //测试SD卡是否正常工作
  if (!card.init(SPI_HALF_SPEED, chipSelect)) { 
   
    Serial.println("initialization failed. Things to check:");
    Serial.println("* is a card inserted?");
    Serial.println("* is your wiring correct?");
    Serial.println("* did you change the chipSelect pin to match your shield or module?");
    return;
  } else { 
   
    Serial.println("Wiring is correct and a card is present.");
  }
 
  //显示卡的类型
  Serial.print("\nCard type: ");
  switch (card.type()) { 
   
    case SD_CARD_TYPE_SD1:
      Serial.println("SD1");
      break;
    case SD_CARD_TYPE_SD2:
      Serial.println("SD2");
      break;
    case SD_CARD_TYPE_SDHC:
      Serial.println("SDHC");
      break;
    default:
      Serial.println("Unknown");
  } 
  
  //判读能否获取存储类型数据
  if (!volume.init(card)) { 
   
    Serial.println("Could not find FAT16/FAT32 partition.\nMake sure you've formatted the card");
    return;
  }  

  uint32_t volumesize;
  Serial.print("\nVolume type is FAT");
  Serial.println(volume.fatType(), DEC);
  Serial.println();
 
  //显示SD卡容量，计算不同单位
  volumesize = volume.blocksPerCluster();    // clusters are collections of blocks
  volumesize *= volume.clusterCount();       // we'll have a lot of clusters
  volumesize *= 512;                            // SD card blocks are always 512 bytes
  Serial.print("Volume size (bytes): ");
  Serial.println(volumesize);
  Serial.print("Volume size (Kbytes): ");
  volumesize /= 1024;
  Serial.println(volumesize);
  Serial.print("Volume size (Mbytes): ");
  volumesize /= 1024;
  Serial.println(volumesize);
 
  Serial.println("\nFiles found on the card (name, date and size in bytes): ");
  //读取卡里面的文件列表信息
  root.openRoot(volume);
 
  root.ls(LS_R | LS_DATE | LS_SIZE);
}
  
void loop(void) { 
    
}

效果图

打开串口监视器（9600）

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