Deprecate SPIFFS, move examples to LittleFS

SPIFFS has been a great filesystem, but it has significant problems in
many cases (and it's also pretty slow).  Development seems to have
slowed/stopped on the upstream version, and we're not able to provide
support or fix the known issues with it as-is.

Deprecate SPIFFS variable.

Update all examples to use LittleFS instead of SPIFFS.

Also, minor cleanup on very old examples which has obsolete delays
waiting for the Serial port to come up, or which were stuck at 9600 baud
because of their ancient AVR heritage.

Fixes #7095

Author: earlephilhower

cores/esp8266/FS.h

@@ -266,7 +266,7 @@ using fs::SPIFFSConfig;
 #endif //FS_NO_GLOBALS
 
 #if !defined(NO_GLOBAL_INSTANCES) && !defined(NO_GLOBAL_SPIFFS)
-extern fs::FS SPIFFS;
+extern fs::FS SPIFFS __attribute__((deprecated("SPIFFS has been deprecated. Please consider moving to LittleFS or other filesystems.")));
 #endif
 
 #endif //FS_H

cores/esp8266/spiffs_api.cpp

@@ -37,8 +37,8 @@ int32_t spiffs_hal_read(uint32_t addr, uint32_t size, uint8_t *dst) {
     return flash_hal_read(addr, size, dst);
 }
 
-
-
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
 
 namespace spiffs_impl {
 
@@ -149,6 +149,8 @@ extern "C" void spiffs_request_end(void)
     SPIFFS.end();
 }
 
+#pragma GCC diagnostic pop
+
 #endif // ARDUINO
 #endif // !CORE_MOCK
 

cores/esp8266/spiffs_api.h

@@ -171,7 +171,7 @@ class SPIFFSImpl : public FSImpl
             return false;
         }
         _cfg = *static_cast<const SPIFFSConfig *>(&cfg);
-	return true;
+        return true;
     }
 
     bool begin() override
@@ -356,6 +356,8 @@ class SPIFFSImpl : public FSImpl
     std::unique_ptr<uint8_t[]> _cacheBuf;
 
     SPIFFSConfig _cfg;
+
+    int _called = 0;
 };
 
 #define CHECKFD() while (_fd == 0) { panic(); }

libraries/DNSServer/examples/CaptivePortalAdvanced/CaptivePortalAdvanced.ino

@@ -56,7 +56,7 @@ unsigned int status = WL_IDLE_STATUS;
 
 void setup() {
   delay(1000);
-  Serial.begin(9600);
+  Serial.begin(115200);
   Serial.println();
   Serial.println("Configuring access point...");
   /* You can remove the password parameter if you want the AP to be open. */

libraries/EEPROM/examples/eeprom_read/eeprom_read.ino

@@ -15,9 +15,6 @@ byte value;
 void setup() {
   // initialize serial and wait for port to open:
   Serial.begin(115200);
-  while (!Serial) {
-    ; // wait for serial port to connect. Needed for Leonardo only
-  }
   EEPROM.begin(512);
 }
 

libraries/ESP8266HTTPClient/examples/PostHttpClient/PostHttpClient.ino

@@ -8,8 +8,6 @@
 #include <ESP8266WiFi.h>
 #include <ESP8266HTTPClient.h>
 
-#define USE_SERIAL Serial
-
 /* this can be run with an emulated server on host:
         cd esp8266-core-root-dir
         cd tests/host
@@ -27,21 +25,21 @@
 
 void setup() {
 
-  USE_SERIAL.begin(115200);
+  Serial.begin(115200);
 
-  USE_SERIAL.println();
-  USE_SERIAL.println();
-  USE_SERIAL.println();
+  Serial.println();
+  Serial.println();
+  Serial.println();
 
   WiFi.begin(STASSID, STAPSK);
 
   while (WiFi.status() != WL_CONNECTED) {
     delay(500);
-    USE_SERIAL.print(".");
+    Serial.print(".");
   }
-  USE_SERIAL.println("");
-  USE_SERIAL.print("Connected! IP address: ");
-  USE_SERIAL.println(WiFi.localIP());
+  Serial.println("");
+  Serial.print("Connected! IP address: ");
+  Serial.println(WiFi.localIP());
 
 }
 
@@ -52,29 +50,29 @@ void loop() {
     WiFiClient client;
     HTTPClient http;
 
-    USE_SERIAL.print("[HTTP] begin...\n");
+    Serial.print("[HTTP] begin...\n");
     // configure traged server and url
     http.begin(client, "http://" SERVER_IP "/postplain/"); //HTTP
     http.addHeader("Content-Type", "application/json");
 
-    USE_SERIAL.print("[HTTP] POST...\n");
+    Serial.print("[HTTP] POST...\n");
     // start connection and send HTTP header and body
     int httpCode = http.POST("{\"hello\":\"world\"}");
 
     // httpCode will be negative on error
     if (httpCode > 0) {
       // HTTP header has been send and Server response header has been handled
-      USE_SERIAL.printf("[HTTP] POST... code: %d\n", httpCode);
+      Serial.printf("[HTTP] POST... code: %d\n", httpCode);
 
       // file found at server
       if (httpCode == HTTP_CODE_OK) {
         const String& payload = http.getString();
-        USE_SERIAL.println("received payload:\n<<");
-        USE_SERIAL.println(payload);
-        USE_SERIAL.println(">>");
+        Serial.println("received payload:\n<<");
+        Serial.println(payload);
+        Serial.println(">>");
       }
     } else {
-      USE_SERIAL.printf("[HTTP] POST... failed, error: %s\n", http.errorToString(httpCode).c_str());
+      Serial.printf("[HTTP] POST... failed, error: %s\n", http.errorToString(httpCode).c_str());
     }
 
     http.end();

libraries/ESP8266WebServer/examples/FSBrowser/FSBrowser.ino

@@ -25,8 +25,8 @@
 
 // Select the FileSystem by uncommenting one of the lines below
 
-#define USE_SPIFFS
-//#define USE_LITTLEFS
+//#define USE_SPIFFS
+#define USE_LITTLEFS
 //#define USE_SDFS
 
 // Uncomment the following line to embed a version of the web page in the code

libraries/ESP8266WebServer/examples/HttpHashCredAuth/HttpHashCredAuth.ino

@@ -7,10 +7,11 @@
   1. Creating a secure web server using ESP8266ESP8266WebServerSecure
   2. Use of HTTP authentication on this secure server
   3. A simple web interface to allow an authenticated user to change Credentials
-  4. Persisting those credentials through a reboot of the ESP by saving them to SPIFFS without storing them as plain text
+  4. Persisting those credentials through a reboot of the ESP by saving them to LittleFS without storing them as plain text
 */
 
 #include <FS.h>
+#include <LittleFS.h>
 #include <ESP8266WiFi.h>
 #include <ESP8266WebServerSecure.h>
 
@@ -23,8 +24,8 @@
 const char* ssid = STASSID;
 const char* wifi_pw = STAPSK;
 
-const String file_credentials = R"(/credentials.txt)"; //SPIFFS file name for the saved credentials
-const String change_creds =  "changecreds"; //address for a credential change
+const String file_credentials = R"(/credentials.txt)"; // LittleFS file name for the saved credentials
+const String change_creds =  "changecreds";            // Address for a credential change
 
 //The ESP8266WebServerSecure requires an encryption certificate and matching key.
 //These can generated with the bash script available in the ESP8266 Arduino repository.
@@ -83,7 +84,7 @@ gz5JWYhbD6c38khSzJb0pNXCo3EuYAVa36kDM96k1BtWuhRS10Q1VXk=
 
 ESP8266WebServerSecure server(443);
 
-//These are temporary credentials that will only be used if none are found saved in SPIFFS.
+//These are temporary credentials that will only be used if none are found saved in LittleFS.
 String login = "admin";
 const String realm = "global";
 String H1 = "";
@@ -92,9 +93,9 @@ String authentication_failed = "User authentication has failed.";
 void setup() {
   Serial.begin(115200);
 
-  //Initialize SPIFFS to save credentials
-  if(!SPIFFS.begin()){
-		Serial.println("SPIFFS initialization error, programmer flash configured?");
+  //Initialize LittleFS to save credentials
+  if(!LittleFS.begin()){
+		Serial.println("LittleFS initialization error, programmer flash configured?");
     ESP.restart();
 	}
 
@@ -187,16 +188,16 @@ void showcredentialpage(){
   server.send(200, "text/html", page);
 }
 
-//Saves credentials to SPIFFS
+//Saves credentials to LittleFS
 void savecredentials(String new_login, String new_password)
 {
   //Set global variables to new values
   login=new_login;
   H1=ESP8266WebServer::credentialHash(new_login,realm,new_password);
 
-  //Save new values to SPIFFS for loading on next reboot
+  //Save new values to LittleFS for loading on next reboot
   Serial.println("Saving credentials.");
-  File f=SPIFFS.open(file_credentials,"w"); //open as a brand new file, discard old contents
+  File f=LittleFS.open(file_credentials,"w"); //open as a brand new file, discard old contents
   if(f){
     Serial.println("Modifying credentials in file system.");
     f.println(login);
@@ -208,12 +209,12 @@ void savecredentials(String new_login, String new_password)
   Serial.println("Credentials saved.");
 }
 
-//loads credentials from SPIFFS
+//loads credentials from LittleFS
 void loadcredentials()
 {
   Serial.println("Searching for credentials.");
   File f;
-  f=SPIFFS.open(file_credentials,"r");
+  f=LittleFS.open(file_credentials,"r");
   if(f){
     Serial.println("Loading credentials from file system.");
     String mod=f.readString(); //read the file to a String

libraries/ESP8266WiFi/examples/BearSSL_CertStore/BearSSL_CertStore.ino

@@ -2,11 +2,11 @@
 //
 // Before running, you must download the set of certs using
 // the script "certs-from-mozilla.py" (no parameters)
-// and then uploading the generated .AR file to SPIFFS or SD.
+// and then uploading the generated .AR file to LittleFS or SD.
 //
 // You do not need to generate the ".IDX" file listed below,
 // it is generated automatically when the CertStore object
-// is created and written to SD or SPIFFS by the ESP8266.
+// is created and written to SD or LittleFS by the ESP8266.
 //
 // Why would you need a CertStore?
 //
@@ -37,6 +37,7 @@
 #include <CertStoreBearSSL.h>
 #include <time.h>
 #include <FS.h>
+#include <LittleFS.h>
 
 #ifndef STASSID
 #define STASSID "your-ssid"
@@ -117,7 +118,7 @@ void setup() {
   Serial.println();
   Serial.println();
 
-  SPIFFS.begin();
+  LittleFS.begin();
   // If using a SD card or LittleFS, call the appropriate ::begin instead
 
   // We start by connecting to a WiFi network
@@ -138,10 +139,10 @@ void setup() {
 
   setClock(); // Required for X.509 validation
 
-  int numCerts = certStore.initCertStore(SPIFFS, PSTR("/certs.idx"), PSTR("/certs.ar"));
+  int numCerts = certStore.initCertStore(LittleFS, PSTR("/certs.idx"), PSTR("/certs.ar"));
   Serial.printf("Number of CA certs read: %d\n", numCerts);
   if (numCerts == 0) {
-    Serial.printf("No certs found. Did you run certs-from-mozilla.py and upload the SPIFFS directory before running?\n");
+    Serial.printf("No certs found. Did you run certs-from-mozilla.py and upload the LittleFS directory before running?\n");
     return; // Can't connect to anything w/o certs!
   }
 

libraries/ESP8266WiFi/examples/BearSSL_CertStore/certs-from-mozilla.py

@@ -3,7 +3,7 @@
 # This script pulls the list of Mozilla trusted certificate authorities
 # from the web at the "mozurl" below, parses the file to grab the PEM
 # for each cert, and then generates DER files in a new ./data directory
-# Upload these to a SPIFFS filesystem and use the CertManager to parse
+# Upload these to an on-chip filesystem and use the CertManager to parse
 # and use them for your outgoing SSL connections.
 #
 # Script by Earle F. Philhower, III.  Released to the public domain.