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libraries/SD/examples/listfilesEnhanced/listfilesEnhanced.ino
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/* | ||
Listfiles Enhanced | ||
This example demonstrates how to list files on an SDcard in the following way: | ||
1) collect all directories | ||
2) build full path of directories and keep in mind | ||
3) then print all files with the help of the directorie pathes | ||
Wiring: | ||
SDcard attached to SPI bus as follows: | ||
- MOSI: pin 11 | ||
- MISO: pin 12 | ||
- CLK : pin 13 | ||
- CS : pin 4 | ||
Created: | ||
18. Nov 2024 by Frank Häfele | ||
This example code is in the public domain. | ||
*/ | ||
#include <SPI.h> | ||
#include <SD.h> | ||
#include <vector> | ||
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#define SD_CS_PIN 4 | ||
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void dir(String path) { | ||
std::vector<String> directories; | ||
collectDirectories(path, directories); | ||
for (auto directory : directories) { | ||
printDirectoryName(directory.c_str(), 1); | ||
File fs = SD.open(directory); | ||
printFilesInDirectory(fs); | ||
Serial.println("\n==============="); | ||
fs.close(); | ||
} | ||
} | ||
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void setup() { | ||
// Open serial communications and wait for port to open: | ||
Serial.begin(115200); | ||
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Serial.print("\n\n==== List Directory ====\n\n"); | ||
listDirectory(); | ||
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Serial.println("done!"); | ||
} | ||
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void loop() { | ||
// nothing happens after setup finishes. | ||
} | ||
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void listDirectory() { | ||
Serial.print("\n\nInitializing SD card..."); | ||
if (!SD.begin(SD_CS_PIN)) { | ||
Serial.println("initialization failed!"); | ||
return; | ||
} | ||
Serial.print("initialization successful.\n"); | ||
Serial.print("List Files:\n"); | ||
dir("/"); | ||
} | ||
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void printDirectoryName(const char *name, uint8_t level) { | ||
for (uint8_t i = 0; i < level; ++i) { | ||
Serial.print(" "); | ||
} | ||
Serial.println(name); | ||
} | ||
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// helper function: combine path | ||
String joinPath(const String &base, const String &name) { | ||
if (base.endsWith("/")) { | ||
return base + name; | ||
} | ||
return base + "/" + name; | ||
} | ||
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// recusive function to collect directory names | ||
void collectDirectories(const String &dirname, std::vector<String> &directories) { | ||
File root = SD.open(dirname); | ||
if (!root || !root.isDirectory()) { | ||
Serial.printf("Error: Cannot open %s\n", dirname.c_str()); | ||
return; | ||
} | ||
directories.push_back(dirname); | ||
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File file = root.openNextFile(); | ||
while (file) { | ||
if (file.isDirectory()) { | ||
String fullPath = joinPath(dirname, file.name()); | ||
collectDirectories(fullPath, directories); | ||
} | ||
file = root.openNextFile(); | ||
} | ||
root.close(); | ||
} | ||
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// print filenames | ||
void printFileName(File file) { | ||
Serial.print("\t"); | ||
Serial.printf("%30s", file.name()); | ||
// files have sizes, directories do not | ||
Serial.print(" - "); | ||
Serial.print(file.size(), DEC); | ||
time_t cr = file.getCreationTime(); | ||
time_t lw = file.getLastWrite(); | ||
struct tm *tmstruct = localtime(&cr); | ||
Serial.printf("\tCREATION: %d-%02d-%02d %02d:%02d:%02d", (tmstruct->tm_year) + 1900, (tmstruct->tm_mon) + 1, tmstruct->tm_mday, tmstruct->tm_hour, tmstruct->tm_min, tmstruct->tm_sec); | ||
tmstruct = localtime(&lw); | ||
Serial.printf("\tLAST WRITE: %d-%02d-%02d %02d:%02d:%02d\n", (tmstruct->tm_year) + 1900, (tmstruct->tm_mon) + 1, tmstruct->tm_mday, tmstruct->tm_hour, tmstruct->tm_min, tmstruct->tm_sec); | ||
} | ||
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// print files in directories | ||
void printFilesInDirectory(File dir) { | ||
while (true) { | ||
auto file = dir.openNextFile(); | ||
if (!file) { | ||
// no more files | ||
break; | ||
} | ||
if (file.isDirectory()) { | ||
continue; | ||
} else { | ||
printFileName(file); | ||
} | ||
} | ||
} |