Update 30.07.

bootloaders/eboot/eboot.c

@@ -229,7 +229,10 @@ int main()
         ets_wdt_enable();
 
         ets_putc('0'+res); ets_putc('\n');
-
+#if 0
+	//devyte: this verify step below (cmp:) only works when the end of copy operation above does not overwrite the 
+	//beginning of the image in the empty area, see #7458. Disabling for now. 
+        //TODO: replace the below verify with hash type, crc, or similar.
         // Verify the copy
         ets_putc('c'); ets_putc('m'); ets_putc('p'); ets_putc(':');
         if (res == 0) {
@@ -239,6 +242,7 @@ int main()
             }
 
         ets_putc('0'+res); ets_putc('\n');
+#endif	    
         if (res == 0) {
             cmd.action = ACTION_LOAD_APP;
             cmd.args[0] = cmd.args[1];

cores/esp8266/Arduino.h

@@ -43,8 +43,6 @@ extern "C" {
 #define HIGH 0x1
 #define LOW  0x0
 
-#define PWMRANGE 1023
-
 //GPIO FUNCTIONS
 #define INPUT             0x00
 #define INPUT_PULLUP      0x02
@@ -176,6 +174,7 @@ int analogRead(uint8_t pin);
 void analogReference(uint8_t mode);
 void analogWrite(uint8_t pin, int val);
 void analogWriteFreq(uint32_t freq);
+void analogWriteResolution(int res);
 void analogWriteRange(uint32_t range);
 
 unsigned long millis(void);

cores/esp8266/Updater.cpp

@@ -35,6 +35,7 @@ UpdaterClass::UpdaterClass()
 , _startAddress(0)
 , _currentAddress(0)
 , _command(U_FLASH)
+, _ledPin(-1)
 , _hash(nullptr)
 , _verify(nullptr)
 , _progress_callback(nullptr)

cores/esp8266/core_esp8266_features.h

@@ -92,7 +92,19 @@ inline uint32_t esp_get_cycle_count() {
   __asm__ __volatile__("rsr %0,ccount":"=a"(ccount));
   return ccount;
 }
-#endif // not CORE_MOCK
+
+inline uint32_t esp_get_program_counter() __attribute__((always_inline));
+inline uint32_t esp_get_program_counter() {
+  uint32_t pc;
+  __asm__ __volatile__("movi %0, ." : "=r" (pc) : : ); // ©earlephilhower
+  return pc;
+}
+
+#else // CORE_MOCK
+
+inline uint32_t esp_get_program_counter() { return 0; }
+
+#endif // CORE_MOCK
 
 
 // Tools for preloading code into the flash cache

cores/esp8266/core_esp8266_wiring_pwm.cpp

@@ -27,15 +27,21 @@
 extern "C" {
 
 static uint32_t analogMap = 0;
-static int32_t analogScale = PWMRANGE;
+static int32_t analogScale = 255;  // Match upstream default, breaking change from 2.x.x
 static uint16_t analogFreq = 1000;
 
 extern void __analogWriteRange(uint32_t range) {
-  if (range > 0) {
+  if ((range >= 15) && (range <= 65535)) {
     analogScale = range;
   }
 }
 
+extern void __analogWriteResolution(int res) {
+  if ((res >= 4) && (res <= 16)) {
+    analogScale = (1 << res) - 1;
+  }
+}
+
 extern void __analogWriteFreq(uint32_t freq) {
   if (freq < 100) {
     analogFreq = 100;
@@ -57,6 +63,10 @@ extern void __analogWrite(uint8_t pin, int val) {
     val = analogScale;
   }
 
+  // Per the Arduino docs at https://www.arduino.cc/reference/en/language/functions/analog-io/analogwrite/
+  // val: the duty cycle: between 0 (always off) and 255 (always on).
+  // So if val = 0 we have digitalWrite(LOW), if we have val==range we have digitalWrite(HIGH)
+
   analogMap &= ~(1 << pin);
   uint32_t high = (analogPeriod * val) / analogScale;
   uint32_t low = analogPeriod - high;
@@ -75,5 +85,6 @@ extern void __analogWrite(uint8_t pin, int val) {
 extern void analogWrite(uint8_t pin, int val) __attribute__((weak, alias("__analogWrite")));
 extern void analogWriteFreq(uint32_t freq) __attribute__((weak, alias("__analogWriteFreq")));
 extern void analogWriteRange(uint32_t range) __attribute__((weak, alias("__analogWriteRange")));
+extern void analogWriteResolution(int res) __attribute__((weak, alias("__analogWriteResolution")));
 
 };

cores/esp8266/heap.cpp

@@ -164,7 +164,7 @@ void ICACHE_RAM_ATTR print_loc(size_t size, const char* file, int line)
         if (inISR && (uint32_t)file >= 0x40200000) {
             DEBUG_HEAP_PRINTF("File: %p", file);
         } else if (!inISR && (uint32_t)file >= 0x40200000) {
-            char buf[ets_strlen(file)] __attribute__ ((aligned(4)));
+            char buf[ets_strlen(file) + 1] __attribute__((aligned(4)));
             ets_strcpy(buf, file);
             DEBUG_HEAP_PRINTF(buf);
         } else {

cores/esp8266/umm_malloc/umm_local.c

@@ -206,7 +206,7 @@ int ICACHE_FLASH_ATTR umm_info_safe_printf_P(const char *fmt, ...) {
       the PROGMEM address must be word (4 bytes) aligned. The destination
       address for ets_memcpy must also be word-aligned.
     */
-    char ram_buf[ets_strlen(fmt)] __attribute__ ((aligned(4)));
+    char ram_buf[ets_strlen(fmt) + 1] __attribute__((aligned(4)));
     ets_strcpy(ram_buf, fmt);
     va_list argPtr;
     va_start(argPtr, fmt);

doc/ota_updates/readme.rst

@@ -669,6 +669,8 @@ Updater is in the Core and deals with writing the firmware to the flash, checkin
 
 **Note:** The bootloader command will be stored into the first 128 bytes of user RTC memory, then it will be retrieved by eboot on boot. That means that user data present there will be lost `(per discussion in #5330) <https://github.com/esp8266/Arduino/pull/5330#issuecomment-437803456>`__.
 
+**Note:** For uncompressed firmware images, the Updater will change the flash mode bits if they differ from the flash mode the device is currently running at. This ensures that the flash mode is not changed to an incompatible mode when the device is in a remote or hard to access area. Compressed images are not modified, thus changing the flash mode in this instance could result in damage to the ESP8266 and/or flash memory chip or your device no longer be accessible via OTA, and requiring re-flashing via a serial connection `(per discussion in #7307) <https://github.com/esp8266/Arduino/issues/7307#issuecomment-631523053>`__.
+
 Update process - memory view
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

doc/reference.rst

@@ -102,9 +102,19 @@ Analog output
 
 ``analogWrite(pin, value)`` enables software PWM on the given pin. PWM
 may be used on pins 0 to 16. Call ``analogWrite(pin, 0)`` to disable PWM
-on the pin. ``value`` may be in range from 0 to ``PWMRANGE``, which is
-equal to 1023 by default. PWM range may be changed by calling
-``analogWriteRange(new_range)``.
+on the pin.
+
+``value`` may be in range from 0 to 255 (which is the Arduino default).
+PWM range may be changed by calling ``analogWriteRange(new_range)`` or
+``analogWriteResolution(bits)``.  ``new_range`` may be from 15...65535
+or ``bits`` may be from 4...16.
+
+**NOTE:** The default ``analogWrite`` range was 1023 in releases before
+3.0, but this lead to incompatibility with external libraries which
+depended on the Arduino core default of 256.  Existing applications which
+rely on the prior 1023 value may add a call to ``analogWriteRange(1023)``
+to their ``setup()`` routine to retrurn to their old behavior.  Applications
+which already were calling ``analogWriteRange`` need no change.
 
 PWM frequency is 1kHz by default. Call
 ``analogWriteFreq(new_frequency)`` to change the frequency. Valid values 
@@ -113,7 +123,7 @@ are from 100Hz up to 40000Hz.
 The ESP doesn't have hardware PWM, so the implementation is by software. 
 With one PWM output at 40KHz, the CPU is already rather loaded. The more 
 PWM outputs used, and the higher their frequency, the closer you get to 
-the CPU limits, and the less CPU cycles are available for sketch execution. 
+the CPU limits, and the fewer CPU cycles are available for sketch execution.
 
 Timing and delays
 -----------------

libraries/ESP8266HTTPClient/examples/StreamHttpsClient/StreamHttpsClient.ino

@@ -50,7 +50,7 @@ void loop() {
     Serial.print("[HTTPS] begin...\n");
 
     // configure server and url
-    const uint8_t fingerprint[20] = {0xEB, 0xD9, 0xDF, 0x37, 0xC2, 0xCC, 0x84, 0x89, 0x00, 0xA0, 0x58, 0x52, 0x24, 0x04, 0xE4, 0x37, 0x3E, 0x2B, 0xF1, 0x41};
+    const uint8_t fingerprint[20] = {0x15, 0x77, 0xdc, 0x04, 0x7c, 0x00, 0xf8, 0x70, 0x09, 0x34, 0x24, 0xf4, 0xd3, 0xa1, 0x7a, 0x6c, 0x1e, 0xa3, 0xe0, 0x2a};
 
     client->setFingerprint(fingerprint);
 

libraries/ESP8266WebServer/examples/HelloServer/HelloServer.ino

@@ -17,7 +17,7 @@ const int led = 13;
 
 void handleRoot() {
   digitalWrite(led, 1);
-  server.send(200, "text/plain", "hello from esp8266!");
+  server.send(200, "text/plain", "hello from esp8266!\r\n");
   digitalWrite(led, 0);
 }
 
@@ -86,6 +86,66 @@ void setup(void) {
 
   server.onNotFound(handleNotFound);
 
+  /////////////////////////////////////////////////////////
+  // Hook examples
+
+  server.addHook([](const String & method, const String & url, WiFiClient * client, ESP8266WebServer::ContentTypeFunction contentType) {
+    (void)method;      // GET, PUT, ...
+    (void)url;         // example: /root/myfile.html
+    (void)client;      // the webserver tcp client connection
+    (void)contentType; // contentType(".html") => "text/html"
+    Serial.printf("A useless web hook has passed\n");
+    Serial.printf("(this hook is in 0x%08x area (401x=IRAM 402x=FLASH))\n", esp_get_program_counter());
+    return ESP8266WebServer::CLIENT_REQUEST_CAN_CONTINUE;
+  });
+
+  server.addHook([](const String&, const String & url, WiFiClient*, ESP8266WebServer::ContentTypeFunction) {
+    if (url.startsWith("/fail")) {
+      Serial.printf("An always failing web hook has been triggered\n");
+      return ESP8266WebServer::CLIENT_MUST_STOP;
+    }
+    return ESP8266WebServer::CLIENT_REQUEST_CAN_CONTINUE;
+  });
+
+  server.addHook([](const String&, const String & url, WiFiClient * client, ESP8266WebServer::ContentTypeFunction) {
+    if (url.startsWith("/dump")) {
+      Serial.printf("The dumper web hook is on the run\n");
+
+      // Here the request is not interpreted, so we cannot for sure
+      // swallow the exact amount matching the full request+content,
+      // hence the tcp connection cannot be handled anymore by the
+      // webserver.
+#ifdef STREAMTO_API
+      // we are lucky
+      client->toWithTimeout(Serial, 500);
+#else
+      auto last = millis();
+      while ((millis() - last) < 500) {
+        char buf[32];
+        size_t len = client->read((uint8_t*)buf, sizeof(buf));
+        if (len > 0) {
+          Serial.printf("(<%d> chars)", (int)len);
+          Serial.write(buf, len);
+          last = millis();
+        }
+      }
+#endif
+      // Two choices: return MUST STOP and webserver will close it
+      //                       (we already have the example with '/fail' hook)
+      // or                  IS GIVEN and webserver will forget it
+      // trying with IS GIVEN and storing it on a dumb WiFiClient.
+      // check the client connection: it should not immediately be closed
+      // (make another '/dump' one to close the first)
+      Serial.printf("\nTelling server to forget this connection\n");
+      static WiFiClient forgetme = *client; // stop previous one if present and transfer client refcounter
+      return ESP8266WebServer::CLIENT_IS_GIVEN;
+    }
+    return ESP8266WebServer::CLIENT_REQUEST_CAN_CONTINUE;
+  });
+
+  // Hook examples
+  /////////////////////////////////////////////////////////
+
   server.begin();
   Serial.println("HTTP server started");
 }