First Commit

libraries/SdFat/examples/ReadCsvFile/ReadCsvFile.ino

@@ -0,0 +1,155 @@
+#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
+
+char line[40];
+
+//------------------------------------------------------------------------------
+// Store error strings in flash to save RAM.
+#define error(s) sd.errorHalt(&Serial, F(s))
+//------------------------------------------------------------------------------
+// Check for extra characters in field or find minus sign.
+char* skipSpace(char* str) {
+  while (isspace(*str)) str++;
+  return str;
+}
+//------------------------------------------------------------------------------
+bool parseLine(char* str) {
+  char* ptr;
+
+  // Set strtok start of line.
+  str = strtok(str, ",");
+  if (!str) return false;
+
+  // Print text field.
+  Serial.println(str);
+
+  // Subsequent calls to strtok expects a null pointer.
+  str = strtok(nullptr, ",");
+  if (!str) return false;
+
+  // Convert string to long integer.
+  int32_t i32 = strtol(str, &ptr, 0);
+  if (str == ptr || *skipSpace(ptr)) return false;
+  Serial.println(i32);
+
+  str = strtok(nullptr, ",");
+  if (!str) return false;
+
+  // strtoul accepts a leading minus with unexpected results.
+  if (*skipSpace(str) == '-') return false;
+
+  // Convert string to unsigned long integer.
+  uint32_t u32 = strtoul(str, &ptr, 0);
+  if (str == ptr || *skipSpace(ptr)) return false;
+  Serial.println(u32);
+
+  str = strtok(nullptr, ",");
+  if (!str) return false;
+
+  // Convert string to double.
+  double d = strtod(str, &ptr);
+  if (str == ptr || *skipSpace(ptr)) return false;
+  Serial.println(d);
+
+  // Check for extra fields.
+  return strtok(nullptr, ",") == nullptr;
+}
+//------------------------------------------------------------------------------
+void setup() {
+  Serial.begin(9600);
+
+  // Wait for USB Serial
+  while (!Serial) {
+    yield();
+  }
+  Serial.println("Type any character to start");
+  while (!Serial.available()) {
+    yield();
+  }
+  // Initialize the SD.
+  if (!sd.begin(SD_CONFIG)) {
+    sd.initErrorHalt(&Serial);
+    return;
+  }
+  // Remove any existing file.
+  if (sd.exists("ReadCsvDemo.csv")) {
+    sd.remove("ReadCsvDemo.csv");
+  }
+  // Create the file.
+  if (!file.open("ReadCsvDemo.csv", FILE_WRITE)) {
+    error("open failed");
+  }
+  // Write test data.
+  file.print(
+      F("abc,123,456,7.89\r\n"
+        "def,-321,654,-9.87\r\n"
+        "ghi,333,0xff,5.55"));
+
+  // Rewind file for read.
+  file.rewind();
+
+  while (file.available()) {
+    int n = file.fgets(line, sizeof(line));
+    if (n <= 0) {
+      error("fgets failed");
+    }
+    if (line[n - 1] != '\n' && n == (sizeof(line) - 1)) {
+      error("line too long");
+    }
+    if (!parseLine(line)) {
+      error("parseLine failed");
+    }
+    Serial.println();
+  }
+  file.close();
+  Serial.println(F("Done"));
+}
+
+void loop() {}