You wouldn't believe this simple trick that freed 10 kB of RAM!

CMakeLists.txt

@@ -110,8 +110,6 @@ set(SOURCE_FILES
         user/serial.h
         user/routes.c
         user/routes.h
-        user/uart_asyncdrv.c-
-        user/uart_asyncdrv.h-
         user/cgi_main.c
         user/cgi_main.h
         user/cgi_sockets.c
@@ -155,6 +153,7 @@ include_directories(esp_iot_sdk_v1.5.2/include)
 add_definitions(
         -D__ets__
         -DICACHE_FLASH
+        -DUSE_OPTIMIZE_PRINTF=1
         -DHTTPD_MAX_CONNECTIONS=5
         -DHTTPD_STACKSIZE=1000
         -DICACHE_FLASH_ATTR=

esp_iot_sdk_v1.5.2/include/osapi.h

@@ -35,9 +35,9 @@
 #define os_snprintf ets_snprintf
 
 #ifdef USE_OPTIMIZE_PRINTF
-#define os_printf(fmt, ...) do {	\
+#define os_printf(fmt, ...) do { \
-	static const char flash_str[] ICACHE_RODATA_ATTR STORE_ATTR = fmt;	\
+	  static const char flash_str[] ICACHE_RODATA_ATTR STORE_ATTR = fmt; \
-	os_printf_plus(flash_str, ##__VA_ARGS__);	\
+	  os_printf_plus(flash_str, ##__VA_ARGS__);	\
 	} while(0)
 #else
 #define os_printf	os_printf_plus

esphttpdconfig.mk

@@ -54,4 +54,6 @@ GLOBAL_CFLAGS = \
     -DHTTPD_MAX_POST_LEN=512 \
     -DDEBUG_INPUT=0 \
     -DDEBUG_HEAP=1 \
-    -DDEBUG_MALLOC=0
+    -DDEBUG_MALLOC=0 \
+    -mforce-l32 \
+    -DUSE_OPTIMIZE_PRINTF=1

html_orig/js/app.js

@@ -1609,135 +1609,138 @@ function tr(key) { return _tr[key] || '?'+key+'?'; }
 	w.startScanning = startScanning;
 })(window.WiFi = {});
 /** Handle connections */
-var Conn = (function() {
+var Conn = (function () {
-	var ws;
+  var ws;
-	var heartbeatTout;
+  var heartbeatTout;
-	var pingIv;
+  var pingIv;
-	var xoff = false;
+  var xoff = false;
-	var autoXoffTout;
+  var autoXoffTout;
-
+  var reconTout;
-	function onOpen(evt) {
+
-		console.log("CONNECTED");
+  var pageShown = false;
-	}
+
-
+  function onOpen(evt) {
-	function onClose(evt) {
+    console.log("CONNECTED");
-		console.warn("SOCKET CLOSED, code "+evt.code+". Reconnecting...");
+    doSend("i");
-		setTimeout(function() {
+  }
-			init();
-		}, 200);
-		// this happens when the buffer gets fucked up via invalid unicode.
-		// we basically use polling instead of socket then
-	}
-
-	function onMessage(evt) {
-		try {
-			// . = heartbeat
-			switch (evt.data.charAt(0)) {
-				case 'B':
-				case 'T':
-				case 'S':
-					Screen.load(evt.data);
-					break;
-
-				case '-':
-					//console.log('xoff');
-					xoff = true;
-					autoXoffTout = setTimeout(function(){xoff=false;}, 250);
-					break;
-
-				case '+':
-					//console.log('xon');
-					xoff = false;
-					clearTimeout(autoXoffTout);
-					break;
-			}
-			heartbeat();
-		} catch(e) {
-			console.error(e);
-		}
-	}
 
-	function canSend() {
+  function onClose(evt) {
-		return !xoff;
+    console.warn("SOCKET CLOSED, code " + evt.code + ". Reconnecting...");
-	}
+    clearTimeout(reconTout);
+    reconTout = setTimeout(function () {
+      init();
+    }, 2000);
+    // this happens when the buffer gets fucked up via invalid unicode.
+    // we basically use polling instead of socket then
+  }
 
-	function doSend(message) {
+  function onMessage(evt) {
-		if (_demo) {
+    try {
-			console.log("TX: ", message);
+      // . = heartbeat
-			return true; // Simulate success
+      switch (evt.data.charAt(0)) {
-		}
+        case 'B':
-		if (xoff) {
+        case 'T':
-			// TODO queue
+        case 'S':
-			console.log("Can't send, flood control.");
+          Screen.load(evt.data);
-			return false;
+          if(!pageShown) {
-		}
+            showPage();
+            pageShown = true;
+          }
+          break;
+
+        case '-':
+          //console.log('xoff');
+          xoff = true;
+          autoXoffTout = setTimeout(function () {
+            xoff = false;
+          }, 250);
+          break;
+
+        case '+':
+          //console.log('xon');
+          xoff = false;
+          clearTimeout(autoXoffTout);
+          break;
+      }
+      heartbeat();
+    } catch (e) {
+      console.error(e);
+    }
+  }
 
-		if (!ws) return false; // for dry testing
+  function canSend() {
-		if (ws.readyState != 1) {
+    return !xoff;
-			console.error("Socket not ready");
+  }
-			return false;
-		}
-		if (typeof message != "string") {
-			message = JSON.stringify(message);
-		}
-		ws.send(message);
-		return true;
-	}
 
-	function init() {
+  function doSend(message) {
-		if (_demo) {
+    if (_demo) {
-			console.log("Demo mode!");
+      console.log("TX: ", message);
-			Screen.load(_demo_screen);
+      return true; // Simulate success
-			showPage();
+    }
-			return;
+    if (xoff) {
-		}
+      // TODO queue
-		heartbeat();
+      console.log("Can't send, flood control.");
+      return false;
+    }
 
-		ws = new WebSocket("ws://"+_root+"/term/update.ws");
+    if (!ws) return false; // for dry testing
-		ws.onopen = onOpen;
+    if (ws.readyState != 1) {
-		ws.onclose = onClose;
+      console.error("Socket not ready");
-		ws.onmessage = onMessage;
+      return false;
+    }
+    if (typeof message != "string") {
+      message = JSON.stringify(message);
+    }
+    ws.send(message);
+    return true;
+  }
 
-		console.log("Opening socket.");
+  function init() {
+    if (_demo) {
+      console.log("Demo mode!");
+      Screen.load(_demo_screen);
+      showPage();
+      return;
+    }
 
-		// Ask for initial data
+    clearTimeout(reconTout);
-		$.get('http://'+_root+'/term/init', function(resp, status) {
+    clearTimeout(heartbeatTout);
-			if (status !== 200) location.reload(true);
-			console.log("Data received!");
-			Screen.load(resp);
-			heartbeat();
 
-			showPage();
+    ws = new WebSocket("ws://" + _root + "/term/update.ws");
-		});
+    ws.onopen = onOpen;
-	}
+    ws.onclose = onClose;
+    ws.onmessage = onMessage;
+    console.log("Opening socket.");
+    heartbeat();
+  }
 
-	function heartbeat() {
+  function heartbeat() {
-		clearTimeout(heartbeatTout);
+    clearTimeout(heartbeatTout);
-		heartbeatTout = setTimeout(heartbeatFail, 2000);
+    heartbeatTout = setTimeout(heartbeatFail, 2000);
-	}
+  }
 
-	function heartbeatFail() {
+  function heartbeatFail() {
-		console.error("Heartbeat lost, probing server...");
+    console.error("Heartbeat lost, probing server...");
-		pingIv = setInterval(function() {
+    pingIv = setInterval(function () {
-			console.log("> ping");
+      console.log("> ping");
-			$.get('http://'+_root+'/system/ping', function(resp, status) {
+      $.get('http://' + _root + '/system/ping', function (resp, status) {
-				if (status == 200) {
+        if (status == 200) {
-					clearInterval(pingIv);
+          clearInterval(pingIv);
-					console.info("Server ready, reloading page...");
+          console.info("Server ready, reloading page...");
-					location.reload();
+          location.reload();
-				}
+        }
-			}, {
+      }, {
-				timeout: 100,
+        timeout: 100,
-			});
+      });
-		}, 500);
+    }, 1000);
-	}
+  }
 
-	return {
+  return {
-		ws: null,
+    ws: null,
-		init: init,
+    init: init,
-		send: doSend,
+    send: doSend,
-		canSend: canSend, // check flood control
+    canSend: canSend, // check flood control
-	};
+  };
 })();
 /**
  * User input

libesphttpd

@@ -1 +1 @@
-Subproject commit 13fa224963081e9ff298abd74a59faafcb9bf816
+Subproject commit 3479ab3efcb4581669370cde6a607f936ff5515a

user/apars_csi.c

@@ -760,7 +760,7 @@ do_csi_xterm_screen_cmd(CSI_Data *opts)
 
 // data tables for the DECREPTPARM command response
 struct DECREPTPARM_parity { int parity; const char * msg; };
-static const struct DECREPTPARM_parity DECREPTPARM_parity_arr[] = {
+static const struct DECREPTPARM_parity DECREPTPARM_parity_arr[] ESP_CONST_DATA = {
 	{PARITY_NONE, "1"},
 	{PARITY_ODD, "4"},
 	{PARITY_EVEN, "5"},
@@ -768,7 +768,7 @@ static const struct DECREPTPARM_parity DECREPTPARM_parity_arr[] = {
 };
 
 struct DECREPTPARM_baud { int baud; const char * msg; };
-static const struct DECREPTPARM_baud DECREPTPARM_baud_arr[] = {
+static const struct DECREPTPARM_baud DECREPTPARM_baud_arr[] ESP_CONST_DATA = {
 	{BIT_RATE_300, "48"},
 	{BIT_RATE_600, "56"},
 	{BIT_RATE_1200, "64"},

user/character_sets.h

@@ -12,7 +12,7 @@
 #define CODEPAGE_A_BEGIN 35
 #define CODEPAGE_A_END 35
 
-static const u16 codepage_A[] =
+static const u16 codepage_A[] ESP_CONST_DATA =
 	{//	Unicode    ASCII   SYM
 		// %%BEGIN:A%%
 		0x20a4, // 35   #   £
@@ -26,7 +26,7 @@ static const u16 codepage_A[] =
  * translates VT100 ACS escape codes to Unicode values.
  * Based on rxvt-unicode screen.C table.
  */
-static const u16 codepage_0[] =
+static const u16 codepage_0[] ESP_CONST_DATA =
 	{//	Unicode    ASCII   SYM
 		// %%BEGIN:0%%
 		0x2666, // 96	`	♦
@@ -66,7 +66,7 @@ static const u16 codepage_0[] =
 #define CODEPAGE_1_BEGIN 33
 #define CODEPAGE_1_END 126
 
-static const u16 codepage_1[] =
+static const u16 codepage_1[] ESP_CONST_DATA =
 	{//	Unicode    ASCII   SYM  DOS
 		// %%BEGIN:1%%
 		0x263A,	// 33	!	☺	(1)  - low ASCII symbols from DOS, moved to +32

user/routes.c

@@ -22,7 +22,7 @@ static int wifiPassFn(HttpdConnData *connData, int no, char *user, int userLen,
 /**
  * Application routes
  */
-HttpdBuiltInUrl routes[] = {
+const HttpdBuiltInUrl routes[] ESP_CONST_DATA = {
 	// redirect func for the captive portal
 	ROUTE_CGI_ARG("*", cgiRedirectApClientToHostname, "esp-terminal.ap"),
 

user/routes.h

@@ -4,7 +4,7 @@
 #include <esp8266.h>
 #include <httpd.h>
 
-extern HttpdBuiltInUrl routes[];
+extern const HttpdBuiltInUrl routes[];
 
 /** Broadcast screen state to sockets */
 void screen_notifyChange();