wemosでspiffs

概要

wemos d1 r1でspiffsやってみた。

サンプルコード

# include <Arduino.h>
# include <FS.h>

void setup() {
	Serial.begin(115200);
	bool res = SPIFFS.begin();
	if (!res) 
	{
		Serial.printf("SPIFFS error \n");
		while (true) {};
	}
	FSInfo fs_info;
	SPIFFS.info(fs_info);
	Serial.println("");
	Serial.println(">SPIFFS info");
	Serial.println("totalBytes: " + String(fs_info.totalBytes));
	Serial.println("usedBytes: " + String(fs_info.usedBytes));
	Serial.println("blockSize: " + String(fs_info.blockSize));
	Serial.println("pageSize: " + String(fs_info.pageSize));
	Serial.println("maxOpenFiles: " + String(fs_info.maxOpenFiles));
	Serial.println("maxPathLength: " + String(fs_info.maxPathLength));
	Serial.println("ok");
	Serial.println(">File list");
	Dir dir = SPIFFS.openDir("/");
	while (dir.next()) 
	{
		String fn, fs;
		fn = dir.fileName();
		fn.remove(0, 1);
		fs = String(dir.fileSize());
		Serial.printf("<%s> size=%s\n", fn.c_str(), fs.c_str());
	}
	Serial.println("ok");
	Serial.println(">File write");
	File fd = SPIFFS.open("/test.txt", "w");
	if (!fd) 
	{
		Serial.println("open error1");
		return;
	}
	fd.println("0123456789 abcdefghi");
	fd.close();
	Serial.println("ok");
	Serial.println(">File read");
	File fd2 = SPIFFS.open("/test.txt", "r");
	if (!fd2) 
	{
		Serial.println("open error2");
		return;
	}
	int len = fd2.available();
	Serial.printf("file size=%d\n", len);
	String str = fd2.readString();
	Serial.println(str);
	fd2.close();
	Serial.println("ok");
	Serial.println(">File write");
	File fileToWrite = SPIFFS.open("/test.txt", "w");
	if (!fileToWrite)
	{
		Serial.println("There was an error opening the file for writing");
		return;
	}
	if (fileToWrite.println("ORIGINAL FILE LINE"))
	{
		Serial.println("File was written");
	} 
	else 
	{
		Serial.println("File write failed");
	}
	fileToWrite.close();
	Serial.println("ok");
	Serial.println(">File append");
	File fileToAppend = SPIFFS.open("/test.txt", "a");
	if (!fileToAppend)
	{
		Serial.println("There was an error opening the file for appending");
		return;
	}
	if (fileToAppend.println("APPENDED FILE LINE"))
	{
		Serial.println("File content was appended");
	} 
	else 
	{
		Serial.println("File append failed");
	}
	fileToAppend.close();
	Serial.println("ok");
	Serial.println(">File read");
	File fileToRead = SPIFFS.open("/test.txt", "r");
	if (!fileToRead)
	{
		Serial.println("Failed to open file for reading");
		return;
	}
	Serial.println("File Content:");
	while (fileToRead.available())
	{
		Serial.write(fileToRead.read());
	}
	fileToRead.close();
	Serial.println("ok");
}
void loop() {
	delay(300);
}

実行結果

>SPIFFS info
totalBytes: 957314
usedBytes: 502
blockSize: 8192
pageSize: 256
maxOpenFiles: 5
maxPathLength: 32
ok
>File list
<test.txt> size=40
                  ok
>File write
ok
>File read
file size=22
            0123456789 abcdefghi

ok
>File write
File was written
ok
>File append
File content was appended
ok
>File read
File Content:
ORIGINAL FILE LINE
APPENDED FILE LINE
ok

以上。