Simplify MyMainESP8266 for core 3.0.x (mysensors#1496)

and replace ICACHE_RAM_ATTR by IRAM_ATTR

Author: virtual-maker

examples/EnergyMeterPulseSensor/EnergyMeterPulseSensor.ino

@@ -68,12 +68,6 @@ MyMessage wattMsg(CHILD_ID, V_WATT);
 MyMessage kWhMsg(CHILD_ID, V_KWH);
 MyMessage pcMsg(CHILD_ID, V_VAR1);
 
-#if defined(ARDUINO_ARCH_ESP8266) || defined(ARDUINO_ARCH_ESP32)
-#define IRQ_HANDLER_ATTR ICACHE_RAM_ATTR
-#else
-#define IRQ_HANDLER_ATTR
-#endif
-
 void IRQ_HANDLER_ATTR onPulse()
 {
 	if (!SLEEP_MODE) {

examples/WaterMeterPulseSensor/WaterMeterPulseSensor.ino

@@ -75,12 +75,6 @@ double oldvolume =0;
 uint32_t lastSend =0;
 uint32_t lastPulse =0;
 
-#if defined(ARDUINO_ARCH_ESP8266) || defined(ARDUINO_ARCH_ESP32)
-#define IRQ_HANDLER_ATTR ICACHE_RAM_ATTR
-#else
-#define IRQ_HANDLER_ATTR
-#endif
-
 void IRQ_HANDLER_ATTR onPulse()
 {
 	if (!SLEEP_MODE) {

hal/architecture/ESP8266/MyMainESP8266.cpp

@@ -6,7 +6,7 @@
  * network topology allowing messages to be routed to nodes.
  *
  * Created by Henrik Ekblad <[email protected]>
- * Copyright (C) 2013-2020 Sensnology AB
+ * Copyright (C) 2013-2022 Sensnology AB
  * Full contributor list: https://github.com/mysensors/MySensors/graphs/contributors
  *
  * Documentation: http://www.mysensors.org
@@ -17,332 +17,29 @@
  * version 2 as published by the Free Software Foundation.
  */
 
-//This may be used to change user task stack size:
-//#define CONT_STACKSIZE 4096
-#include <Arduino.h>
-#include "Schedule.h"
-extern "C" {
-#include "ets_sys.h"
-#include "os_type.h"
-#include "osapi.h"
-#include "mem.h"
-#include "user_interface.h"
-#include "cont.h"
-}
-#include <core_version.h>
-#include "gdb_hooks.h"
-
-#define LOOP_TASK_PRIORITY 1
-#define LOOP_QUEUE_SIZE    1
-#define OPTIMISTIC_YIELD_TIME_US 16000
-
-extern "C" void call_user_start();
-extern void loop();
-extern void setup();
-extern void(*__init_array_start)(void);
-extern void(*__init_array_end)(void);
-
-/* Not static, used in Esp.cpp */
-struct rst_info resetInfo;
-
-/* Not static, used in core_esp8266_postmortem.c and other places.
- * Placed into noinit section because we assign value to this variable
- * before .bss is zero-filled, and need to preserve the value.
- */
-cont_t* g_pcont __attribute__((section(".noinit")));
-
-/* Event queue used by the main (arduino) task */
-static os_event_t s_loop_queue[LOOP_QUEUE_SIZE];
-
-/* Used to implement optimistic_yield */
-static uint32_t s_micros_at_task_start;
-
-/* For ets_intr_lock_nest / ets_intr_unlock_nest
- * Max nesting seen by SDK so far is 2.
- */
-#define ETS_INTR_LOCK_NEST_MAX 7
-static uint16_t ets_intr_lock_stack[ETS_INTR_LOCK_NEST_MAX];
-static byte     ets_intr_lock_stack_ptr = 0;
-
-
-extern "C" {
-	extern const uint32_t __attribute__((section(".ver_number"))) core_version =
-	    ARDUINO_ESP8266_GIT_VER;
-	const char* core_release =
-#ifdef ARDUINO_ESP8266_RELEASE
-	    ARDUINO_ESP8266_RELEASE;
-#else
-	    NULL;
-#endif
-} // extern "C"
-
-void initVariant() __attribute__((weak));
-void initVariant()
-{
-}
-
-void preloop_update_frequency() __attribute__((weak));
-void preloop_update_frequency()
-{
-#if defined(F_CPU) && (F_CPU == 160000000L)
-	REG_SET_BIT(0x3ff00014, BIT(0));
-	ets_update_cpu_frequency(160);
-#endif
-}
-
-extern "C" bool can_yield()
-{
-	return cont_can_yield(g_pcont);
-}
-
-static inline void esp_yield_within_cont() __attribute__((always_inline));
-static void esp_yield_within_cont()
-{
-	cont_yield(g_pcont);
-	run_scheduled_recurrent_functions();
-}
-
-extern "C" void esp_yield()
-{
-	if (can_yield()) {
-		esp_yield_within_cont();
-	}
-}
-
-extern "C" void esp_schedule()
-{
-	// always on CONT stack here
-	ets_post(LOOP_TASK_PRIORITY, 0, 0);
-}
-
-extern "C" void __yield()
-{
-	if (can_yield()) {
-		esp_schedule();
-		esp_yield_within_cont();
-	} else {
-		panic();
-	}
-}
-
-extern "C" void yield(void) __attribute__((weak, alias("__yield")));
-
-extern "C" void optimistic_yield(uint32_t interval_us)
-{
-	if (can_yield() &&
-	        (system_get_time() - s_micros_at_task_start) > interval_us) {
-		yield();
-	}
-}
-
-
-// Replace ets_intr_(un)lock with nestable versions
-extern "C" void IRAM_ATTR ets_intr_lock()
-{
-	if (ets_intr_lock_stack_ptr < ETS_INTR_LOCK_NEST_MAX) {
-		ets_intr_lock_stack[ets_intr_lock_stack_ptr++] = xt_rsil(3);
-	} else {
-		xt_rsil(3);
-	}
-}
-
-extern "C" void IRAM_ATTR ets_intr_unlock()
-{
-	if (ets_intr_lock_stack_ptr > 0) {
-		xt_wsr_ps(ets_intr_lock_stack[--ets_intr_lock_stack_ptr]);
-	} else {
-		xt_rsil(0);
-	}
-}
-
-
-// Save / Restore the PS state across the rom ets_post call as the rom code
-// does not implement this correctly.
-extern "C" bool ets_post_rom(uint8 prio, ETSSignal sig, ETSParam par);
-
-extern "C" bool IRAM_ATTR ets_post(uint8 prio, ETSSignal sig, ETSParam par)
-{
-	uint32_t saved;
-	asm volatile ("rsr %0,ps":"=a" (saved));
-	bool rc = ets_post_rom(prio, sig, par);
-	xt_wsr_ps(saved);
-	return rc;
-}
-
-extern "C" void __loop_end(void)
+inline void _my_sensors_loop()
 {
-	run_scheduled_functions();
-	run_scheduled_recurrent_functions();
-}
-
-extern "C" void loop_end(void) __attribute__((weak, alias("__loop_end")));
-
-static void loop_wrapper()
-{
-	static bool setup_done = false;
-	preloop_update_frequency();
-	if (!setup_done) {
-		_begin();		// Startup MySensors library
-		setup_done = true;
-	}
-	_process();			// Process incoming data
+	// Process incoming data
+	_process();
+	// Call of loop() in the Arduino sketch
 	loop();
-	run_scheduled_functions();
-	esp_schedule();
 }
 
-static void loop_task(os_event_t *events)
-{
-	(void)events;
-	s_micros_at_task_start = system_get_time();
-	cont_run(g_pcont, &loop_wrapper);
-	if (cont_check(g_pcont) != 0) {
-		panic();
-	}
-}
-extern "C" {
-
-	struct object {
-		long placeholder[10];
-	};
-	void __register_frame_info(const void *begin, struct object *ob);
-	extern char __eh_frame[];
-}
-
-static void do_global_ctors(void)
-{
-	static struct object ob;
-	__register_frame_info(__eh_frame, &ob);
-
-	void(**p)(void) = &__init_array_end;
-	while (p != &__init_array_start) {
-		(*--p)();
-	}
-}
-
-extern "C" {
-	extern void __unhandled_exception(const char *str);
-
-	static void  __unhandled_exception_cpp()
-	{
-#ifndef __EXCEPTIONS
-		abort();
-#else
-		static bool terminating;
-		if (terminating) {
-			abort();
-		}
-		terminating = true;
-		/* Use a trick from vterminate.cc to get any std::exception what() */
-		try {
-			__throw_exception_again;
-		} catch (const std::exception& e) {
-			__unhandled_exception(e.what());
-		} catch (...) {
-			__unhandled_exception("");
-		}
-#endif
-	}
-
-}
-
-void init_done()
-{
-	system_set_os_print(1);
-	gdb_init();
-	std::set_terminate(__unhandled_exception_cpp);
-	do_global_ctors();
-	esp_schedule();
-}
-
-/* This is the entry point of the application.
- * It gets called on the default stack, which grows down from the top
- * of DRAM area.
- * .bss has not been zeroed out yet, but .data and .rodata are in place.
- * Cache is not enabled, so only ROM and IRAM functions can be called.
- * Peripherals (except for SPI0 and UART0) are not initialized.
- * This function does not return.
- */
 /*
-	A bit of explanation for this entry point:
-
-	SYS is the SDK task/context used by the upperlying system to run its
-	administrative tasks (at least WLAN and lwip's receive callbacks and
-	Ticker).  NONOS-SDK is designed to run user's non-threaded code in
-	another specific task/context with its own stack in BSS.
-
-	Some clever fellows found that the SYS stack was a large and quite unused
-	piece of ram that we could use for the user's stack instead of using user's
-	main memory, thus saving around 4KB on ram/heap.
-
-	A problem arose later, which is that this stack can heavily be used by
-	the SDK for some features.  One of these features is WPS.  We still don't
-	know if other features are using this, or if this memory is going to be
-	used in future SDK releases.
-
-	WPS beeing flawed by its poor security, or not beeing used by lots of
-	users, it has been decided that we are still going to use that memory for
-	user's stack and disable the use of WPS.
-
-	app_entry() jumps to app_entry_custom() defined as "weakref" calling
-	itself a weak customizable function, allowing to use another one when
-	this is required (see core_esp8266_app_entry_noextra4k.cpp, used by WPS).
-
-	(note: setting app_entry() itself as "weak" is not sufficient and always
-	 ends up with the other "noextra4k" one linked, maybe because it has a
-	 default ENTRY(app_entry) value in linker scripts).
-
-	References:
-	https://github.com/esp8266/Arduino/pull/4553
-	https://github.com/esp8266/Arduino/pull/4622
-	https://github.com/esp8266/Arduino/issues/4779
-	https://github.com/esp8266/Arduino/pull/4889
-
-*/
-
-extern "C" void app_entry_redefinable(void) __attribute__((weak));
-extern "C" void app_entry_redefinable(void)
-{
-	/* Allocate continuation context on this SYS stack,
-		 and save pointer to it. */
-	cont_t s_cont __attribute__((aligned(16)));
-	g_pcont = &s_cont;
-
-	/* Call the entry point of the SDK code. */
-	call_user_start();
-}
-
-static void app_entry_custom(void) __attribute__((weakref("app_entry_redefinable")));
-
-extern "C" void app_entry(void)
-{
-	return app_entry_custom();
-}
-
-extern "C" void preinit(void) __attribute__((weak));
-extern "C" void preinit(void)
-{
-	/* do nothing by default */
-}
-
-extern "C" void user_init(void)
-{
-	struct rst_info *rtc_info_ptr = system_get_rst_info();
-	memcpy((void *)&resetInfo, (void *)rtc_info_ptr, sizeof(resetInfo));
-
-	uart_div_modify(0, UART_CLK_FREQ / (115200));
-
-	init(); // in core_esp8266_wiring.c, inits hw regs and sdk timer
-
-	initVariant();
-
-	cont_init(g_pcont);
+ * Use preprocessor defines for injection of the MySensors calls
+ * to _begin() and _process() in file core_esp8266_main.cpp.
+ * These functions implement the "magic" how the MySensors stack
+ * is setup and executed in background without need
+ * for explicit calls from the Arduino sketch.
+ */
 
-	preinit(); // Prior to C++ Dynamic Init (not related to above init() ). Meant to be user redefinable.
+// Start up MySensors library including call of setup() in the Arduino sketch
+#define setup _begin
+// Helper function to _process() and call of loop() in the Arduino sketch
+#define loop _my_sensors_loop
 
-	ets_task(loop_task,
-	         LOOP_TASK_PRIORITY, s_loop_queue,
-	         LOOP_QUEUE_SIZE);
+#include <core_esp8266_main.cpp>
 
-	system_init_done_cb(&init_done);
-}
+// Tidy up injection defines
+#undef loop
+#undef setup

hal/architecture/MyHwHAL.h

@@ -43,7 +43,11 @@
 * @brief ESP8266/ESP32 IRQ handlers need to be stored in IRAM
 */
 #if defined(ARDUINO_ARCH_ESP8266) || defined(ARDUINO_ARCH_ESP32)
+#if defined(ARDUINO_ARCH_ESP8266) && ARDUINO_ESP8266_MAJOR == 3
+#define IRQ_HANDLER_ATTR IRAM_ATTR
+#else
 #define IRQ_HANDLER_ATTR ICACHE_RAM_ATTR
+#endif
 #else
 #define IRQ_HANDLER_ATTR
 #endif