查看“向SD卡中写入一个txt文档”的源代码

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<p style="color: #4F4E4E;font-size:220%">'''Module_SD库-写入txt文件示例'''</p>
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在下面的示例中，使用Core核心向SD卡中写入一个txt文件。
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<p style="color: #E87E05;font-size:155%">所需硬件</p>
*[[mCookie-Core]]
*[[mCookie-Battery]]
*[[MCookie-SD]]
*一张TF卡/MicroSD卡
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<p style="color: #E87E05;font-size:155%">电路搭建</p>
将Battery、Core、MCookie_SD堆叠在一起，并插入SD卡，通过MicroUSB数据线接入电脑。
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<p style="color: #E87E05;font-size:155%">代码</p>
<source lang="cpp">

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

File myFile;

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }


  Serial.print("Initializing SD card...");

// Microduino SD module: pin 7
  if (!SD.begin(D7)) {
    Serial.println("initialization failed!");
    return;
  }
  Serial.println("initialization done.");

  // open the file. note that only one file can be open at a time,
  // so you have to close this one before opening another.
  myFile = SD.open("test.txt", FILE_WRITE);

  // if the file opened okay, write to it:
  if (myFile) {
    Serial.print("Writing to test.txt...");
    myFile.println("testing 1, 2, 3.");
    // close the file:
    myFile.close();
    Serial.println("done.");
  } else {
    // if the file didn't open, print an error:
    Serial.println("error opening test.txt");
  }

  // re-open the file for reading:
  myFile = SD.open("test.txt");
  if (myFile) {
    Serial.println("test.txt:");

    // read from the file until there's nothing else in it:
    while (myFile.available()) {
      Serial.write(myFile.read());
    }
    // close the file:
    myFile.close();
  } else {
    // if the file didn't open, print an error:
    Serial.println("error opening test.txt");
  }
}

void loop() {
  // nothing happens after setup
}

</source>

若想真正确认SD卡中的内容，可以使用读卡器连接电脑，打开SD卡中的txt文件观察内容是否与程序一致
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[[MCookie-SD Reference | 返回SD库语法手册]]