UnoRP2040 SD卡

SD卡示例

UNO RP2040有一个板载SD卡插槽，可以轻松从微型SD卡读取和写入文件。要使用Arduino执行此操作，您需要插入micro SD卡，安装SdFat库的Adafruit fork，并运行提供的示例代码。

步骤1.安装SDFat库
您可以使用Arduino IDE中的库管理器为Arduino安装SDFat库的Adafruit Fork。

步骤2.单击管理库...菜单项，搜索Adafruit SDFat，然后选择SDFat-Adafruit Fork库：

步骤 3.将以下代码复制并粘贴到 Arduino IDE 中

// SPDX-FileCopyrightText: 2023 Liz Clark for Adafruit Industries
//
// SPDX-License-Identifier: MIT
/*
  SD card read/write

 This example shows how to read and write data to and from an SD card file
 The circuit:
 * SD card attached to SPI0 bus as follows:
 ** MOSI - pin 19
 ** MISO - pin 20
 ** CLK - pin 18

 created   Nov 2010
 by David A. Mellis
 modified 9 Apr 2012
 by Tom Igoe
 modified 14 Feb 2023
 by Liz Clark

 This example code is in the public domain.

 */

#include "SdFat.h"
SdFat sd;

#define SD_FAT_TYPE 1

// default CS pin is 23 for Metro RP2040
#define SD_CS_PIN 23

File32 myFile;

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(115200);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }


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

  if (!sd.begin(SD_CS_PIN)) {
    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.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.");
    myFile.println("hello metro rp2040!");
    // 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.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
}

现象

如果已插入SD卡，串口会打印initialization done.
如果未插入SD卡，串口会打印initialization failed!

疑难解答

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