// SPDX-FileCopyrightText: 2025 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 SPI bus as follows:
 ** MOSI - pin 35
 ** MISO - pin 36
 ** CLK - pin 34

 created   Nov 2010
 by David A. Mellis
 modified 9 Apr 2012
 by Tom Igoe
 modified 14 Feb 2023
 by Liz Clark
 modified 25 Aug 2023
 by Kattni Rembor
 modified 18 Feb 2025
 by Tim Cocks



 This example code is in the public domain.

 */

#include <SPI.h>
#include "SdFat.h"

#define SD_CS_PIN 39

SdFat SD;
FsFile myFile;
SdSpiConfig config(SD_CS_PIN, DEDICATED_SPI, SD_SCK_MHZ(16), &SPI1);

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(115200);
  while (!Serial) { yield(); delay(10); }     // wait till serial port is opened
  delay(100);  // RP2040 delay is not a bad idea

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

  // Retry mechanism for SD card initialization
  while (!SD.begin(config)) {
    Serial.println("initialization failed! Retrying...");
    delay(1000); // Wait for a second before retrying
  }
  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.");
    myFile.println("hello world!");
    // 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
}

// SPDX-FileCopyrightText: 2025 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 SPI bus as follows:
 ** MOSI - pin 35
 ** MISO - pin 36
 ** CLK - pin 34

 created   Nov 2010
 by David A. Mellis
 modified 9 Apr 2012
 by Tom Igoe
 modified 14 Feb 2023
 by Liz Clark
 modified 25 Aug 2023
 by Kattni Rembor
 modified 18 Feb 2025
 by Tim Cocks



 This example code is in the public domain.

 */

#include <SPI.h>
#include "SdFat.h"

#define SD_CS_PIN 39

SdFat SD;
FsFile myFile;
SdSpiConfig config(SD_CS_PIN, DEDICATED_SPI, SD_SCK_MHZ(16), &SPI1);

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(115200);
  while (!Serial) { yield(); delay(10); }     // wait till serial port is opened
  delay(100);  // RP2040 delay is not a bad idea

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

  // Retry mechanism for SD card initialization
  while (!SD.begin(config)) {
    Serial.println("initialization failed! Retrying...");
    delay(1000); // Wait for a second before retrying
  }
  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.");
    myFile.println("hello world!");
    // 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
}