adding sd card demos

Feather_RP2040_Adalogger/Arduino_RP2040_Adalogger_microSD/Arduino_RP2040_Adalogger_microSD.ino

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+// 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 SPI bus as follows:
+ ** MOSI - pin 11
+ ** MISO - pin 12
+ ** CLK - pin 13
+
+ 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
+
+ This example code is in the public domain.
+
+ */
+
+#include <SPI.h>
+#include "SdFat.h"
+
+#define SD_CS_PIN 23
+
+SdFat SD;
+File32 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
+}

Feather_RP2040_Adalogger/CircuitPython_SD_Card_Read/code.py

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+# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
+# SPDX-License-Identifier: MIT
+
+"""
+CircuitPython Essentials SD Card Read Demo
+Feather RP2040 Adalogger
+"""
+
+import os
+import busio
+import digitalio
+import board
+import storage
+import adafruit_sdcard
+
+# Connect to the card and mount the filesystem.
+cs = digitalio.DigitalInOut(board.SD_CS)
+sd_spi = busio.SPI(board.SD_CLK, board.SD_MOSI, board.SD_MISO)
+sdcard = adafruit_sdcard.SDCard(sd_spi, cs)
+vfs = storage.VfsFat(sdcard)
+storage.mount(vfs, "/sd")
+
+# Use the filesystem as normal! Our files are under /sd
+
+# This helper function will print the contents of the SD
+def print_directory(path, tabs=0):
+    for file in os.listdir(path):
+        stats = os.stat(path + "/" + file)
+        filesize = stats[6]
+        isdir = stats[0] & 0x4000
+
+        if filesize < 1000:
+            sizestr = str(filesize) + " bytes"
+        elif filesize < 1000000:
+            sizestr = "%0.1f KB" % (filesize / 1000)
+        else:
+            sizestr = "%0.1f MB" % (filesize / 1000000)
+
+        prettyprintname = ""
+        for _ in range(tabs):
+            prettyprintname += "   "
+        prettyprintname += file
+        if isdir:
+            prettyprintname += "/"
+        print("{0:<40} Size: {1:>10}".format(prettyprintname, sizestr))
+
+        # recursively print directory contents
+        if isdir:
+            print_directory(path + "/" + file, tabs + 1)
+
+
+print("Files on filesystem:")
+print("====================")
+print_directory("/sd")

Feather_RP2040_Adalogger/CircuitPython_SD_Card_Write/code.py

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+# SPDX-FileCopyrightText: 2017 Limor Fried for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
+"""
+CircuitPython Essentials SD Card Write Demo
+Feather RP2040 Adalogger
+"""
+
+import time
+import busio
+import board
+import digitalio
+import microcontroller
+import storage
+import adafruit_sdcard
+
+# Connect to the card and mount the filesystem.
+cs = digitalio.DigitalInOut(board.SD_CS)
+sd_spi = busio.SPI(board.SD_CLK, board.SD_MOSI, board.SD_MISO)
+sdcard = adafruit_sdcard.SDCard(sd_spi, cs)
+vfs = storage.VfsFat(sdcard)
+storage.mount(vfs, "/sd")
+
+# Use the filesystem as normal! Our files are under /sd
+
+print("Logging temperature to filesystem")
+# append to the file!
+while True:
+    # open file for append
+    with open("/sd/temperature.txt", "a") as f:
+        t = microcontroller.cpu.temperature
+        print("Temperature = %0.1f" % t)
+        f.write("%0.1f\n" % t)
+    # file is saved
+    time.sleep(1)