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a57d390499
correct SS pin setup is already handled by SPI subsystem. this should prevent future issues like #2868 current implementation assures that: * pin10 is OUTPUT HIGH if SPI.begin() is called and the pin was unconfigured * pin10 state is not modified if pinMode(10, OUTPUT) is called before SPI.begin() * pin10 is INPUT HI-Z if nor pinMode(10, OUTPUT) nor SPI.begin() are called
81 lines
1.5 KiB
C++
81 lines
1.5 KiB
C++
/*
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SD card basic file example
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This example shows how to create and destroy 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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modified 9 Apr 2012
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by Tom Igoe
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This example code is in the public domain.
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*/
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#include <SPI.h>
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#include <SD.h>
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File myFile;
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void setup()
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{
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// Open serial communications and wait for port to open:
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Serial.begin(9600);
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while (!Serial) {
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; // wait for serial port to connect. Needed for Leonardo only
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}
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Serial.print("Initializing SD card...");
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if (!SD.begin(4)) {
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Serial.println("initialization failed!");
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return;
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}
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Serial.println("initialization done.");
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if (SD.exists("example.txt")) {
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Serial.println("example.txt exists.");
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}
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else {
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Serial.println("example.txt doesn't exist.");
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}
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// open a new file and immediately close it:
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Serial.println("Creating example.txt...");
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myFile = SD.open("example.txt", FILE_WRITE);
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myFile.close();
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// Check to see if the file exists:
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if (SD.exists("example.txt")) {
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Serial.println("example.txt exists.");
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}
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else {
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Serial.println("example.txt doesn't exist.");
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}
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// delete the file:
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Serial.println("Removing example.txt...");
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SD.remove("example.txt");
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if (SD.exists("example.txt")) {
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Serial.println("example.txt exists.");
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}
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else {
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Serial.println("example.txt doesn't exist.");
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}
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}
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void loop()
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{
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// nothing happens after setup finishes.
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}
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