Closed
Description
a little bit changed example from IDE (SD listfiles), file listing moved to "loop".
Code stops listing microSD card after 17-20 loops (arduino nano).
(there is similar code, also listing files on microsd, that works fine on the same hardware)
/*
Listfiles
This example shows how print out the files in a
directory on a SD card
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
modified 9 Apr 2012
by Tom Igoe
modified 2 Feb 2014
by Scott Fitzgerald
This example code is in the public domain.
*/
#include <SPI.h>
#include <SD.h>
File root;
void setup()
{
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
Serial.print("Initializing SD card...");
digitalWrite(10, 1); // turn the LED on (HIGH is the voltage level)
digitalWrite(4, 0); // turn the LED on (HIGH is the voltage level)
delay(2000);
while (!SD.begin(4)) {
Serial.println("initialization failed!");
delay(2000);
// return;
}
Serial.println("initialization done.");
}
void loop(){
Serial.println("starting!");
root = SD.open("/");
printDirectory(root, 0);
Serial.println("done!");
delay(2000);
pinMode(10, OUTPUT);
pinMode(4, OUTPUT);
digitalWrite(10, 1); // turn the LED on (HIGH is the voltage level)
digitalWrite(4, 0); // turn the LED on (HIGH is the voltage level)
}
void printDirectory(File dir, int numTabs) {
while(true) {
File entry = dir.openNextFile();
if (! entry) {
// no more files
break;
}
for (uint8_t i=0; i<numTabs; i++) {
Serial.print('\t');
}
Serial.print(entry.name());
if (entry.isDirectory()) {
Serial.println("/");
printDirectory(entry, numTabs+1);
} else {
// files have sizes, directories do not
Serial.print("\t\t");
Serial.println(entry.size(), DEC);
}
entry.close();
}
}