Add sample application for using second esp32 core

Author: mikee47

samples/Esp32_Dual_Core/Makefile

@@ -0,0 +1,9 @@
+#####################################################################
+#### Please don't change this file. Use component.mk instead ####
+#####################################################################
+
+ifndef SMING_HOME
+$(error SMING_HOME is not set: please configure it as an environment variable)
+endif
+
+include $(SMING_HOME)/project.mk

samples/Esp32_Dual_Core/README.rst

@@ -0,0 +1,8 @@
+ESP32 Dual Core
+===============
+
+Basic example of using second core of Esp32 chip.
+
+Code should be in IRAM and avoid accessing flash, especially the filing system.
+
+Sming is NOT thread-safe!

samples/Esp32_Dual_Core/app/application.cpp

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+#include <SmingCore.h>
+
+void handleNotification(uint32_t param)
+{
+	Serial << "NOTIFY " << param << endl;
+}
+
+// Code to run on second CPU
+void IRAM_ATTR app2_main(void*)
+{
+	static unsigned count;
+
+	for(;;) {
+		System.queueCallback(handleNotification, count);
+		++count;
+		delay(500);
+	}
+}
+
+void init()
+{
+	Serial.begin(SERIAL_BAUD_RATE);
+	Serial.systemDebugOutput(true);
+
+	Serial.println(_F("ESP32 dual-core demo."));
+
+	const unsigned stackSize = 2048;
+	const unsigned priority = 5;
+	xTaskCreatePinnedToCore(app2_main, "Sming2", stackSize, nullptr, priority, nullptr, 1);
+}

samples/Esp32_Dual_Core/component.mk

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+COMPONENT_SOC := esp32
+
+DISABLE_NETWORK := 1
+
+SDK_CUSTOM_CONFIG := esp32-dual-core.cfg

samples/Esp32_Dual_Core/esp32-dual-core.cfg

@@ -0,0 +1 @@
+CONFIG_FREERTOS_UNICORE=n