First Commit

libraries/SdFat/examples/TeensyRtcTimestamp/TeensyRtcTimestamp.ino

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+// Test of time-stamp callback with Teensy 3/4.
+// The upload time will be used to set the RTC.
+// You must arrange for syncing the RTC.
+#include <TimeLib.h>
+
+#include "SdFat.h"
+
+// SD_FAT_TYPE = 0 for SdFat/File as defined in SdFatConfig.h,
+// 1 for FAT16/FAT32, 2 for exFAT, 3 for FAT16/FAT32 and exFAT.
+#define SD_FAT_TYPE 3
+/*
+  Change the value of SD_CS_PIN if you are using SPI and
+  your hardware does not use the default value, SS.
+  Common values are:
+  Arduino Ethernet shield: pin 4
+  Sparkfun SD shield: pin 8
+  Adafruit SD shields and modules: pin 10
+*/
+
+// SDCARD_SS_PIN is defined for the built-in SD on some boards.
+#ifndef SDCARD_SS_PIN
+const uint8_t SD_CS_PIN = SS;
+#else   // SDCARD_SS_PIN
+// Assume built-in SD is used.
+const uint8_t SD_CS_PIN = SDCARD_SS_PIN;
+#endif  // SDCARD_SS_PIN
+
+// Try max SPI clock for an SD. Reduce SPI_CLOCK if errors occur.
+#define SPI_CLOCK SD_SCK_MHZ(50)
+
+// Try to select the best SD card configuration.
+#if HAS_SDIO_CLASS
+#define SD_CONFIG SdioConfig(FIFO_SDIO)
+#elif ENABLE_DEDICATED_SPI
+#define SD_CONFIG SdSpiConfig(SD_CS_PIN, DEDICATED_SPI, SPI_CLOCK)
+#else  // HAS_SDIO_CLASS
+#define SD_CONFIG SdSpiConfig(SD_CS_PIN, SHARED_SPI, SPI_CLOCK)
+#endif  // HAS_SDIO_CLASS
+
+#if SD_FAT_TYPE == 0
+SdFat sd;
+File file;
+#elif SD_FAT_TYPE == 1
+SdFat32 sd;
+File32 file;
+#elif SD_FAT_TYPE == 2
+SdExFat sd;
+ExFile file;
+#elif SD_FAT_TYPE == 3
+SdFs sd;
+FsFile file;
+#else  // SD_FAT_TYPE
+#error Invalid SD_FAT_TYPE
+#endif  // SD_FAT_TYPE
+
+//------------------------------------------------------------------------------
+// Call back for file timestamps.  Only called for file create and sync().
+void dateTime(uint16_t* date, uint16_t* time, uint8_t* ms10) {
+  // Return date using FS_DATE macro to format fields.
+  *date = FS_DATE(year(), month(), day());
+
+  // Return time using FS_TIME macro to format fields.
+  *time = FS_TIME(hour(), minute(), second());
+
+  // Return low time bits in units of 10 ms.
+  *ms10 = second() & 1 ? 100 : 0;
+}
+//------------------------------------------------------------------------------
+time_t getTeensy3Time() { return Teensy3Clock.get(); }
+//------------------------------------------------------------------------------
+void printField(Print* pr, char sep, uint8_t v) {
+  if (sep) {
+    pr->write(sep);
+  }
+  if (v < 10) {
+    pr->write('0');
+  }
+  pr->print(v);
+}
+//------------------------------------------------------------------------------
+void printNow(Print* pr) {
+  pr->print(year());
+  printField(pr, '-', month());
+  printField(pr, '-', day());
+  printField(pr, ' ', hour());
+  printField(pr, ':', minute());
+  printField(pr, ':', second());
+}
+//------------------------------------------------------------------------------
+void setup() {
+  // set the Time library to use Teensy 3.0's RTC to keep time
+  setSyncProvider(getTeensy3Time);
+
+  Serial.begin(9600);
+  while (!Serial) {
+    yield();
+  }
+  Serial.println(F("Type any character to begin"));
+  while (!Serial.available()) {
+    yield();
+  }
+  if (timeStatus() != timeSet) {
+    Serial.println("Unable to sync with the RTC");
+    return;
+  }
+  Serial.print(F("DateTime::now "));
+  printNow(&Serial);
+  Serial.println();
+
+  // Set callback
+  FsDateTime::setCallback(dateTime);
+
+  if (!sd.begin(SD_CONFIG)) {
+    sd.initErrorHalt(&Serial);
+  }
+  // Remove old version to set create time.
+  if (sd.exists("RtcTest.txt")) {
+    sd.remove("RtcTest.txt");
+  }
+  if (!file.open("RtcTest.txt", FILE_WRITE)) {
+    Serial.println(F("file.open failed"));
+    return;
+  }
+  // Print current date time to file.
+  file.print(F("Test file at: "));
+  printNow(&file);
+  file.println();
+
+  file.close();
+  // List files in SD root.
+  sd.ls(LS_DATE | LS_SIZE);
+  Serial.println(F("Done"));
+}
+//------------------------------------------------------------------------------
+void loop() {}