etcontroller: add application and makefile

src/app/etcontroller/Makefile.inc

+ifdef app
+	override timer_s = 0
+	loop = 1
+endif
+
+ifneq (${etcontroller_reset_pin}, )
+	COMMON_FLAGS += -DCONFIG_ETCONTROLLER_RESET_PIN=${etcontroller_reset_pin}
+endif
+
+ifeq (${etcontroller_nrst}, 1)
+	COMMON_FLAGS += -DCONFIG_ETCONTROLLER_NRST
+endif

src/app/etcontroller/main.cc

+#include "arch.h"
+#include "driver/gpio.h"
+#include "driver/stdout.h"
+#include "driver/uptime.h"
+
+int main(void)
+{
+	arch.setup();
+	gpio.setup();
+	kout.setup();
+
+	kout << "Hello, World!" << endl;
+	kout << "Naptime." << endl;
+
+#ifdef CONFIG_ETCONTROLLER_NRST
+	gpio.output(CONFIG_ETCONTROLLER_RESET_PIN, 0);
+	arch.delay_ms(1);
+	gpio.write(CONFIG_ETCONTROLLER_RESET_PIN, 1);
+#else
+	gpio.output(CONFIG_ETCONTROLLER_RESET_PIN, 1);
+	arch.delay_ms(1);
+	gpio.write(CONFIG_ETCONTROLLER_RESET_PIN, 0);
+#endif
+
+	arch.idle();
+
+	return 0;
+}