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updated SD examples with new constants, and commented them

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This commit is contained in:
Tom Igoe
2010-12-03 10:35:17 -05:00
parent dce5e09e69
commit 86e3d4ad7a
3 changed files with 106 additions and 34 deletions
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68
libraries/SD/examples/Files/Files.pde
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@ -1,40 +1,76 @@
/*
SD card basic file example
This example shows how to create and destroy an SD card file
The circuit:
* SD card attached to SPI bus as follows:
** MOSI - pin 11
** MISO - pin 12
** CLK - pin 13
** CS - pin 4
created Nov 2010
by David A. Mellis
updated 2 Dec 2010
by Tom Igoe
This example code is in the public domain.
*/
#include <SD.h>
File f;
File myFile;
void setup()
{
Serial.begin(9600);
Serial.print("Initializing SD card...");
// On the Ethernet Shield, CS is pin 4. Note that even if it's not
// used as the CS pin, the hardware SS pin (10 on most Arduino boards,
// 53 on the Mega) must be left as an output or the SD library
// functions will not work.
// On the Ethernet Shield, CS is pin 4. It's set as an output by default.
// Note that even if it's not used as the CS pin, the hardware SS pin
// (10 on most Arduino boards, 53 on the Mega) must be left as an output
// or the SD library functions will not work.
if (!SD.begin(4)) {
Serial.println("failed!");
Serial.println("initialization failed!");
return;
}
Serial.println("done.");
if (SD.exists("example.txt")) Serial.println("example.txt exists.");
else Serial.println("example.txt doesn't exist.");
Serial.println("initialization done.");
if (SD.exists("example.txt")) {
Serial.println("example.txt exists.");
}
else {
Serial.println("example.txt doesn't exist.");
}
// open a new file and immediately close it:
Serial.println("Creating example.txt...");
f = SD.open("example.txt", true);
f.close();
myFile = SD.open("example.txt", FILE_TRUNCATE);
myFile.close();
if (SD.exists("example.txt")) Serial.println("example.txt exists.");
else Serial.println("example.txt doesn't exist.");
// Check to see if the file exists:
if (SD.exists("example.txt")) {
Serial.println("example.txt exists.");
}
else {
Serial.println("example.txt doesn't exist.");
}
// delete the file:
Serial.println("Removing example.txt...");
SD.remove("example.txt");
if (SD.exists("example.txt")) Serial.println("example.txt exists.");
else Serial.println("example.txt doesn't exist.");
if (SD.exists("example.txt")){
Serial.println("example.txt exists.");
}
else {
Serial.println("example.txt doesn't exist.");
}
}
void loop()
{
// nothing happens after setup finishes.
}