Arduino ESP32 第三方库读取SD卡信息

Posted 2021-12-24 perseverance52

Arduino ESP32 第三方库读取SD卡信息

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• 所需库github地址：https://github.com/nhatuan84/esp32-micro-sdcard

如果网页无法加载，将域名改为镜像地址的例如：https://hub.fastgit.org/nhatuan84/esp32-micro-sdcard

• 该库支持软SPI接口和硬SPI接口.如果使用硬SPI接口直接定义：

    if (!SD.begin())  
    Serial.println("initialization failed!");
    return;
  

• 如果是软SPI接口就这样初始化：

  if (!SD.begin(26, 14, 13, 27)) 
    Serial.println("initialization failed!");
    return;
  

接线说明

• 软SPI接口接线方式：

		Soft SPI 
[ESP32 IO26 – CS MICRO SD]
[ESP32 IO14 – MOSI MICRO SD]
[ESP32 IO13 – MISO MICRO SD]
[ESP32 IO27 – SCK MICRO SD]
[ESP32 GND – GND MICRO SD]
[VIN – VCC MICRO SD]

• 硬SPI接口接线方式：

    		Hard SPI
 * MICROSD CS    -    ESP32 IO5
  MICROSD SCK   -     ESP32 IO18
  MICROSD MOSI  -    ESP32 IO23
  MICROSD MISO   -   ESP32 IO19
  MICROSD Vcc   -      ESP32 VIN
  MICROSD GND   -    ESP32 GND

实例代码一

#include <SPI.h>
#include <mySD.h>

File root;

// change this to match your SD shield or module;
//     Arduino Ethernet shield: pin 4
//     Adafruit SD shields and modules: pin 10
//     Sparkfun SD shield: pin 8
const int chipSelect = 4;

void setup()

  // Open serial communications and wait for port to open:
  Serial.begin(115200);
   while (!Serial) 
    ; // wait for serial port to connect. Needed for Leonardo only
  


  Serial.print("Initializing SD card...");
  // On the Ethernet Shield, CS is pin 4. It's set as an output by default.
  // Note that even if it's not used as the CS pin, the hardware SS pin 
  // (10 on Arduino Uno boards, 53 on the Mega) must be left as an output 
  // or the SD library functions will not work. 
//  pinMode(SS, OUTPUT);

  if (!SD.begin(26, 14, 13, 27)) 
    Serial.println("initialization failed!");
    return;
  
  Serial.println("initialization done.");

  root = SD.open("/");
  
  printDirectory(root, 0);
  
  Serial.println("done!");


void loop()

  // nothing happens after setup finishes.


void printDirectory(File dir, int numTabs) 
  // Begin at the start of the directory
  dir.rewindDirectory();
  
  while(true) 
     File entry =  dir.openNextFile();
     if (! entry) 
       // no more files
       //Serial.println("**nomorefiles**");
       break;
     
     for (uint8_t i=0; i<numTabs; i++) 
       Serial.print('\\t');   // we'll have a nice indentation
     
     // Print the 8.3 name
     Serial.print(entry.name());
     // Recurse for directories, otherwise print the file size
     if (entry.isDirectory()) 
       Serial.println("/");
       printDirectory(entry, numTabs+1);
      else 
       // files have sizes, directories do not
       Serial.print("\\t\\t");
       Serial.println(entry.size(), DEC);
     
     entry.close();
   

• 编译信息

使用 1.0  版本的库 SPI 在文件夹： C:\\Users\\Administrator\\AppData\\Local\\Arduino15\\packages\\esp32\\hardware\\esp32\\1.0.6\\libraries\\SPI 
使用库 esp32-micro-sdcard-master 在文件夹： C:\\Program Files (x86)\\Arduino\\libraries\\esp32-micro-sdcard-master (legacy)
"C:\\\\Users\\\\Administrator\\\\AppData\\\\Local\\\\Arduino15\\\\packages\\\\esp32\\\\tools\\\\xtensa-esp32-elf-gcc\\\\1.22.0-97-gc752ad5-5.2.0/bin/xtensa-esp32-elf-size" -A "d:\\\\arduino\\\\MyHexDir/nanosdcard1.ino.elf"
项目使用了 216594 字节，占用了 (16%) 程序存储空间。最大为 1310720 字节。
全局变量使用了14224字节，(4%)的动态内存，余留313456字节局部变量。最大为327680字节。

• 分别测试了一张128MB的TF卡和一张2GB的TF卡都可以，实例代码一读取到卡内信息,但是读不全信息。