65 lines
1.7 KiB
Plaintext
Executable File
65 lines
1.7 KiB
Plaintext
Executable File
// Ported to SdFat from the native Arduino SD library example by Bill Greiman
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// On the Ethernet Shield, CS is pin 4. SdFat handles setting SS
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const int chipSelect = 4;
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/*
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SD card read/write
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This example shows how to read and write data to and from an SD card file
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The circuit:
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* SD card attached to SPI bus as follows:
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** MOSI - pin 11
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** MISO - pin 12
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** CLK - pin 13
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** CS - pin 4
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created Nov 2010
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by David A. Mellis
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updated 2 Dec 2010
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by Tom Igoe
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modified by Bill Greiman 11 Apr 2011
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This example code is in the public domain.
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*/
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#include <SdFat.h>
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SdFat sd;
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SdFile myFile;
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void setup() {
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Serial.begin(9600);
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// Initialize SdFat or print a detailed error message and halt
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// Use half speed like the native library.
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// change to SPI_FULL_SPEED for more performance.
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if (!sd.init(SPI_HALF_SPEED, chipSelect)) sd.initErrorHalt();
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// open the file for write at end like the Native SD library
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if (!myFile.open("test.txt", O_RDWR | O_CREAT | O_AT_END)) {
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sd.errorHalt("opening test.txt for write failed");
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}
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// if the file opened okay, write to it:
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Serial.print("Writing to test.txt...");
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myFile.println("testing 1, 2, 3.");
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// close the file:
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myFile.close();
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Serial.println("done.");
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// re-open the file for reading:
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if (!myFile.open("test.txt", O_READ)) {
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sd.errorHalt("opening test.txt for read failed");
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}
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Serial.println("test.txt:");
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// read from the file until there's nothing else in it:
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int data;
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while ((data = myFile.read()) > 0) Serial.write(data);
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// close the file:
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myFile.close();
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}
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void loop() {
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// nothing happens after setup
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}
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