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Delete all files on an SD card (Arduino/SPI)
#include <SD.h>
const int SDChipSelect = 4; // SS pin on the SD card.
// Other pins connected to normal SPI
File root;
int DeletedCount = 0;
int FolderDeleteCount = 0;
int FailCount = 0;
String rootpath = "/";
void setup()
{
Serial.begin(9600);
pinMode(10, OUTPUT);
SD.begin(SDChipSelect);
root = SD.open("/");
delay(2000);
rm(root, rootpath);
if( !DeletedCount && !FailCount && !FolderDeleteCount ){
}
else{
Serial.print("Deleted ");
Serial.print(DeletedCount);
Serial.print(" file");
if( DeletedCount != 1 ){
Serial.print("s");
}
Serial.print(" and ");
Serial.print(FolderDeleteCount);
Serial.print(" folder");
if ( FolderDeleteCount != 1 ){
Serial.print("s");
}
Serial.println(" from SD card.");
if( FailCount > 0 ){
Serial.print("Failed to delete ");
Serial.print(FailCount);
Serial.print(" item");
if( FailCount != 1 ){
Serial.print("s");
}
}
}
}
void loop()
{
while(1){
// nada
}
}
void rm(File dir, String tempPath) {
while(true) {
File entry = dir.openNextFile();
String localPath;
Serial.println("");
if (entry) {
if ( entry.isDirectory() )
{
localPath = tempPath + entry.name() + rootpath + '\0';
char folderBuf[localPath.length()];
localPath.toCharArray(folderBuf, localPath.length() );
rm(entry, folderBuf);
if( SD.rmdir( folderBuf ) )
{
Serial.print("Deleted folder ");
Serial.println(folderBuf);
FolderDeleteCount++;
}
else
{
Serial.print("Unable to delete folder ");
Serial.println(folderBuf);
FailCount++;
}
}
else
{
localPath = tempPath + entry.name() + '\0';
char charBuf[localPath.length()];
localPath.toCharArray(charBuf, localPath.length() );
if( SD.remove( charBuf ) )
{
Serial.print("Deleted ");
Serial.println(localPath);
DeletedCount++;
}
else
{
Serial.print("Failed to delete ");
Serial.println(localPath);
FailCount++;
}
}
}
else {
// break out of recursion
break;
}
}
}
@adebruijn
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adebruijn commented Apr 9, 2017

hello,

i have an issue

in IDE 1.7.10

using
myFile SD.open(filename.c_str(), FILE WRITE); works

but using
SD.remove(filename.c_str()); //error: invalid conversion from 'const char*' to 'char*' [-fpermissive]

NOT

why ???? any ideas ????

thank you , André

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