Fix SdInfo example and file.timestamp. Remove Syscall::yield and SysC…

…all::halt

Fix SdInfo example and file.timestamp. Remove Syscall::yield and SysCall::halt.

Major restructuring for future portability to RTOS systems and RPI Pico.

README.md

@@ -4,7 +4,7 @@ Earlier releases of Version 1 are here:
 
 https://github.com/greiman/SdFat/releases
 
-###### UTF-8 encoded filenames are supported in v2.1.0.
+UTF-8 encoded filenames are supported in v2.1.0 or later.
 
 Try the UnicodeFilenames example.  Here is output from ls:
 <pre>

doc/mainpage.h

@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2011-2020 Bill Greiman
+ * Copyright (c) 2011-2021 Bill Greiman
  * This file is part of the SdFat library for SD memory cards.
  *
  * MIT License
@@ -249,11 +249,9 @@ DirectoryFunctions - Use of chdir(), ls(), mkdir(), and rmdir().
 
 examplesV1 folder - Examples from SdFat V1 for compatibility tests.
 
-%ExFatFormatter - Produces optimal exFAT format for smaller SD cards.
-
 ExFatLogger - A data-logger optimized for exFAT features.
 
-ExFatUnicodeTest - Test program for Unicode file names.
+MinimumSizeSdReader - Example of small file reader for FAT16/FAT32.
 
 OpenNext - Open all files in the root dir and print their filename.
 
@@ -275,10 +273,16 @@ SoftwareSpi - Demo of limited Software SPI support in SdFat V2.
 
 STM32Test - Example use of two SPI ports on an STM32 board.
 
+TeensyDmaAdcLogger - Fast logger using DMA ADC.
+
 TeensyRtcTimestamp - %File timestamps for Teensy3.
 
 TeensySdioDemo - Demo of SDIO and SPI modes for the Teensy 3.5/3.6 built-in SD.
 
+TeensySdioLogger -  Fast logger using a ring buffer.
+
+UnicodeFilenames - Test program for Unicode file names.
+
 UserChipSelectFunction - Useful for port expanders or replacement of the standard GPIO functions.
 
 UserSPIDriver - An example of an external SPI driver.

examples/AvrAdcLogger/AvrAdcLogger.ino

@@ -34,9 +34,6 @@ MinimumSerial MinSerial;
 //------------------------------------------------------------------------------
 // This example was designed for exFAT but will support FAT16/FAT32.
 //
-// If an exFAT SD is required, the ExFatFormatter example will format
-// smaller cards with an exFAT file system.
-//
 // Note: Uno will not support SD_FAT_TYPE = 3.
 // 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.
@@ -152,9 +149,9 @@ const uint16_t ISR_TIMER0 = 160;
 //==============================================================================
 const uint32_t MAX_FILE_SIZE = MAX_FILE_SIZE_MiB << 20;
 
-// Select fastest interface.  Max SPI rate for AVR is 10 MHx.
+// Max SPI rate for AVR is 10 MHz for F_CPU 20 MHz, 8 MHz for F_CPU 16 MHz.
 #define SPI_CLOCK SD_SCK_MHZ(10)
-
+// Select fastest interface.
 #if ENABLE_DEDICATED_SPI
 #define SD_CONFIG SdSpiConfig(SD_CS_PIN, DEDICATED_SPI, SPI_CLOCK)
 #else  // ENABLE_DEDICATED_SPI
@@ -868,7 +865,7 @@ void loop(void) {
   Serial.println(F("r - record ADC data"));
 
   while(!Serial.available()) {
-    SysCall::yield();
+    yield();
   }
   char c = tolower(Serial.read());
   Serial.println();

examples/DirectoryFunctions/DirectoryFunctions.ino

@@ -66,12 +66,12 @@ void setup() {
 
   // Wait for USB Serial
   while (!Serial) {
-    SysCall::yield();
+    yield();
   }
   delay(1000);
   cout << F("Type any character to start\n");
   while (!Serial.available()) {
-    SysCall::yield();
+    yield();
   }
 
   // Initialize the SD card.

examples/ExFatLogger/ExFatLogger.ino

@@ -516,7 +516,7 @@ void setup() {
 
   // Wait for USB Serial
   while (!Serial) {
-    SysCall::yield();
+    yield();
   }
   delay(1000);
   Serial.println(F("Type any character to begin"));
@@ -568,7 +568,7 @@ void loop() {
   Serial.println(F("r - record data"));
   Serial.println(F("t - test without logging"));
   while(!Serial.available()) {
-    SysCall::yield();
+    yield();
   }
   char c = tolower(Serial.read());
   Serial.println();

examples/MinimumSizeSdReader/MinimumSizeSdReader.ino

@@ -0,0 +1,58 @@
+// Create a text file on the SD with this path using short 8.3 names.
+#define SFN_PATH "/DIR/TEST.TXT"
+
+// Modify CS_PIN for your chip select pin.
+#define CS_PIN SS
+
+// Set USE_SD_H to one for SD.h or zero for SdFat.
+#define USE_SD_H 0
+
+#if USE_SD_H
+#include "SD.h"
+File file;
+#else
+#include "SdFat.h"
+// Setting ENABLE_DEDICATED_SPI to zero saves over 200 more bytes.
+#if ENABLE_DEDICATED_SPI
+#warning "Set ENABLE_DEDICATED_SPI zero in SdFat/src/SdFatConfig.h for minimum size"
+#endif  // ENABLE_DEDICATED_SPI
+// Insure FAT16/FAT32 only.
+SdFat32 SD;
+// FatFile does not support Stream functions, just simple read/write.
+FatFile file;
+#endif
+
+void error(const char* msg) {
+  Serial.println(msg);
+  while(true);
+}
+
+void setup() {
+  int n;
+  char buf[4];
+
+  Serial.begin(9600);
+  while (!Serial) {}
+  Serial.println("Type any character to begin");
+  while (!Serial.available()) {}
+
+  if (!SD.begin(CS_PIN)) error("SD.begin");
+
+#if USE_SD_H
+  file = SD.open(SFN_PATH);
+  if (!file) error("open");
+#else
+  // Open existing file with a path of 8.3 names.
+  // Directories will be opened O_RDONLY files O_RDWR.
+  if (!file.openExistingSFN(SFN_PATH)) error("open");
+#endif
+  while ((n = file.read(buf, sizeof(buf)))) {
+   Serial.write(buf, n);
+  }
+// close() is only needed if you write to the file. For example, read
+// config data, modify the data, rewind the file and write the data.
+// file.close();
+}
+
+void loop() {
+}

examples/OpenNext/OpenNext.ino

@@ -63,12 +63,12 @@ void setup() {
 
   // Wait for USB Serial
   while (!Serial) {
-    SysCall::yield();
+    yield();
   }
 
   Serial.println("Type any character to start");
   while (!Serial.available()) {
-    SysCall::yield();
+    yield();
   }
 
   // Initialize the SD.

examples/QuickStart/QuickStart.ino

@@ -68,7 +68,7 @@ void setup() {
 
   // Wait for USB Serial
   while (!Serial) {
-    SysCall::yield();
+    yield();
   }
   cout << F("\nSPI pins:\n");
   cout << F("MISO: ") << int(MISO) << endl;
@@ -106,7 +106,7 @@ void loop() {
 
   cout << F("\nEnter the chip select pin number: ");
   while (!Serial.available()) {
-    SysCall::yield();
+    yield();
   }
   cin.readline();
   if (cin >> chipSelect) {
@@ -182,6 +182,6 @@ void loop() {
 
   cout << F("\nSuccess!  Type any character to restart.\n");
   while (!Serial.available()) {
-    SysCall::yield();
+    yield();
   }
 }