New version for library manager

README.md

@@ -3,37 +3,56 @@ file systems on SD/SDHC flash cards.
 
 SdFat requires Arduino 1.6x or greater.
 
-To use SdFat, clone the repository or unzip the ZIP file and place the SdFat
-folder into the libraries sub-folder in your main sketch folder.
+Key changes:
 
-For more information see the Manual installation section of this guide:
+The SPI divisor has been replaced by SPISettings in the begin() call.
 
-http://arduino.cc/en/Guide/Libraries 
-
-A number of configuration options can be set by editing SdFatConfig.h
-\#define macros.  See the html documentation for details
+```
+bool begin(uint8_t csPin = SS, SPISettings spiSettings = SPI_FULL_SPEED);
+```
 
-Read changes.txt if you have used previous releases of this library.
-
-Please read the html documentation for this library.  Start with
-html/index.html and read the Main Page.  Next go to the Classes tab and
-read the documentation for the classes SdFat, SdBaseFile, SdFile, File,
-StdioStream, ifstream, ofstream, and others.
-
-A new class, "File", has been added to provide compatibility with the Arduino
-SD.h library. To use SdFat with programs written for SD.h replace
+Several macros have been defined for backward compatibility. 
 
 ```
-#include <SD.h>
+#define SD_SCK_MHZ(maxMhz) SPISettings(1000000UL*maxMhz, MSBFIRST, SPI_MODE0)
+// SPI divisor constants
+/** Set SCK to max possible rate. */
+#define SPI_FULL_SPEED SD_SCK_MHZ(50)
+/** Set SCK rate to F_CPU/3 for Due */
+#define SPI_DIV3_SPEED SD_SCK_HZ(F_CPU/3)
+/** Set SCK rate to F_CPU/4. */
+#define SPI_HALF_SPEED SD_SCK_HZ(F_CPU/4)
+// ...
 ```
 
-with these two lines:
+There are two new classes, SdFatEX and SdFatSoftSpiEX.
+
+Teensy 3.5/3.6 SDIO support has been added.  Try the TeensySdioDemo example.
+Many other example will work with Teensy SDIO if you use the SdFatSdio classes
+and call begin with no parameters.
 
 ```
-#include "SdFat.h"
-SdFat SD;
+ SdFatSdio sd;
+ 
+ ....
+ 
+  if (!sd.begin()) {
+    // Handle failure.
+  }
+ 
 ```
+Please read changes.txt and the html documentation in the extras folder for more information.
 
+Please report problems as issues.
+
+A number of configuration options can be set by editing SdFatConfig.h
+define macros.  See the html documentation for details
+
+Please read the html documentation for this library.  Start with
+html/index.html and read the Main Page.  Next go to the Classes tab and
+read the documentation for the classes SdFat, SdFatEX, SdBaseFile,
+SdFile, File, StdioStream, ifstream, ofstream, and others.
+
 Please continue by reading the html documentation.
 
-Updated 19 Jul 2016
+Updated 26 Apr 2017