Tidy up backend code for esp8266 (malloc, free, yield)

cores/esp8266/WString.cpp

@@ -121,7 +121,7 @@ String::String(double value, unsigned char decimalPlaces)
 
 String::~String()
 {
-	os_free(buffer);
+	free(buffer);
 }
 
 /*********************************************/
@@ -137,7 +137,7 @@ inline void String::init(void)
 
 void String::invalidate(void)
 {
-	if (buffer) os_free(buffer);
+	if (buffer) free(buffer);
 	buffer = NULL;
 	capacity = len = 0;
 }
@@ -189,7 +189,7 @@ void String::move(String &rhs)
 			rhs.len = 0;
 			return;
 		} else {
-			os_free(buffer);
+			free(buffer);
 		}
 	}
 	buffer = rhs.buffer;

cores/esp8266/abi.cpp

@@ -17,20 +17,10 @@
 */
 
 #include <stdlib.h>
-extern "C"
-{
-#include "ets_sys.h"
-}
 
 extern "C" void __cxa_pure_virtual(void) __attribute__ ((__noreturn__));
 extern "C" void __cxa_deleted_virtual(void) __attribute__ ((__noreturn__));
 
-extern "C" void abort()
-{
-  os_printf(" x_x ");
-  while(true){}
-}
-
 void __cxa_pure_virtual(void) {
   // We might want to write some diagnostics to uart in this case
   //std::terminate();

cores/esp8266/hooks.c

@@ -1,31 +0,0 @@
-/*
-  Copyright (c) 2012 Arduino.  All right reserved.
-
-  This library is free software; you can redistribute it and/or
-  modify it under the terms of the GNU Lesser General Public
-  License as published by the Free Software Foundation; either
-  version 2.1 of the License, or (at your option) any later version.
-
-  This library is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-  See the GNU Lesser General Public License for more details.
-
-  You should have received a copy of the GNU Lesser General Public
-  License along with this library; if not, write to the Free Software
-  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
-*/
-
-/**
- * Empty yield() hook.
- *
- * This function is intended to be used by library writers to build
- * libraries or sketches that supports cooperative threads.
- *
- * Its defined as a weak symbol and it can be redefined to implement a
- * real cooperative scheduler.
- */
-static void __empty() {
-	// Empty
-}
-void yield(void) __attribute__ ((weak, alias("__empty")));

cores/esp8266/main.cpp

@@ -17,6 +17,9 @@
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
 
+//This may be used to change user task stack size:
+//#define CONT_STACKSIZE 4096
+
 #include <Arduino.h>
 extern "C" {
 #include "ets_sys.h"
@@ -26,42 +29,51 @@ extern "C" {
 #include "user_interface.h"
 #include "cont.h"
 }
+#define LOOP_TASK_PRIORITY 0
+#define LOOP_QUEUE_SIZE    1
 
-//Declared weak in Arduino.h to allow user redefinitions.
 int atexit(void (*func)()) { return 0; }
 
-// Weak empty variant initialization function.
-// May be redefined by variant files.
 void initVariant() __attribute__((weak));
 void initVariant() { }
 
 extern void loop();
 extern void setup();
 
-#define LOOP_TASK_PRIORITY 0
-#define LOOP_QUEUE_SIZE    1
+extern void (*__init_array_start)(void);
+extern void (*__init_array_end)(void);
 
-cont_t g_cont;
+static cont_t g_cont;
+static os_event_t g_loop_queue[LOOP_QUEUE_SIZE];
 
-os_event_t loop_queue[LOOP_QUEUE_SIZE];
+extern "C" void esp_yield()
+{
+    cont_yield(&g_cont);
+}
 
-bool g_setup_done = false;
-
-extern "C" void loop_schedule()
+extern "C" void esp_schedule()
 {
     system_os_post(LOOP_TASK_PRIORITY, 0, 0);
 }
 
+extern "C" void __yield() 
+{
+    esp_schedule();
+    esp_yield();
+}
+extern "C" void yield(void) __attribute__ ((weak, alias("__yield")));
+
+
 static void loop_wrapper()
 {
-    if (!g_setup_done)
+    static bool setup_done = false;
+    if (!setup_done)
     {
-        g_setup_done = true;
         setup();
+        setup_done = true;
     }
-
     loop();
-    loop_schedule();
+    esp_schedule();
 }
 
 static void loop_task(os_event_t *events)
@@ -73,9 +85,6 @@ static void loop_task(os_event_t *events)
     }
 }
 
-extern void (*__init_array_start)(void);
-extern void (*__init_array_end)(void);
-
 static void do_global_ctors(void)
 {
     void (**p)(void);
@@ -85,16 +94,13 @@ static void do_global_ctors(void)
 
 void init_done()
 {
-    loop_schedule();
-    
-    int i = ((char*)__init_array_end) - (char*)__init_array_start;
-    os_printf("\r\nInit array size: %d\r\n", i);
+    do_global_ctors();
+    esp_schedule();
 }
 
 extern "C" {
 void user_init(void)
 {
-    do_global_ctors();
     uart_div_modify(0, UART_CLK_FREQ / (115200));
 
     init();
@@ -105,10 +111,10 @@ void user_init(void)
 
     system_os_task( loop_task,
                     LOOP_TASK_PRIORITY,
-                    loop_queue,
+                    g_loop_queue,
                     LOOP_QUEUE_SIZE);
 
-    system_init_done_cb(&init_done);
+    system_init_done_cb(&esp_schedule);
 }
 }
 

cores/esp8266/new.cpp

@@ -16,26 +16,21 @@
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
 
-extern "C" {
-#include "osapi.h"
-#include "ets_sys.h"
-#include "mem.h"
-}
-
+#include <stdlib.h>
 
 void *operator new(size_t size) {
-  return os_malloc(size);
+  return malloc(size);
 }
 
 void *operator new[](size_t size) {
-  return os_malloc(size);
+  return malloc(size);
 }
 
 void operator delete(void * ptr) {
-  os_free(ptr);
+  free(ptr);
 }
 
 void operator delete[](void * ptr) {
-  os_free(ptr);
+  free(ptr);
 }
 

cores/esp8266/wiring.c

@@ -28,8 +28,8 @@
 #include "user_interface.h"
 #include "cont.h"
 
-extern cont_t g_cont;
-extern void loop_schedule();
+extern void esp_schedule();
+extern void esp_yield();
 
 static os_timer_t delay_timer;
 #define ONCE 0
@@ -43,14 +43,14 @@ unsigned long millis()
 
 void delay_end(void* arg)
 {
-    loop_schedule();
+    esp_schedule();
 }
 
 void delay(unsigned long ms)
 {
     os_timer_setfn(&delay_timer, (os_timer_func_t*) &delay_end, 0);
     os_timer_arm(&delay_timer, ms, ONCE);
-    cont_yield(&g_cont);
+    esp_yield();
     os_timer_disarm(&delay_timer);
 }
 

platform.txt

@@ -15,7 +15,7 @@ compiler.sdk.path={compiler.tools.path}/sdk/
 compiler.cpreprocessor.flags=-D__ets__ -DICACHE_FLASH -I{compiler.sdk.path}/include
 
 compiler.c.cmd=xtensa-lx106-elf-gcc
-compiler.c.flags=-c -Os -Wpointer-arith -Wno-implicit-function-declaration -Wl,-EL -fno-inline-functions -nostdlib -mlongcalls -MMD
+compiler.c.flags=-c -Os -Wpointer-arith -Wno-implicit-function-declaration -Wl,-EL -fno-inline-functions -nostdlib -mlongcalls -MMD -std=c99
 
 compiler.c.elf.ldscript=eagle.app.v6.ld
 compiler.c.elf.flags=-nostdlib -Wl,--no-check-sections -u call_user_start -Wl,-static -L{compiler.sdk.path}/lib -L{compiler.sdk.path}/ld -T{compiler.c.elf.ldscript}