extern "C" {
	#include "ets_sys.h"
	#include "osapi.h"
	#include "gpio.h"
	#include "user_interface.h"
}
byte YELLOW_pin = 4;
byte BLUE_pin = 12;
void toggle_blue_yellow__asm()
// yellow pin = 4 => bit mask = 16d, [0...0]10000 (32 bit)
// blue pin = 12 => bit mask = 4096d, [0...0]1 0000 0000 0000 (32 bit)
// PIN_OUT_SET : 0x60000304
// PIN_OUT_CLEAR : 0x60000308
//
{
	asm volatile (
	"movi a2, 0x60000304;" // SET Address in a2
	"movi a3, 0x60000308;" // CLEAR Address in a3
	"movi a4, 16;" // yellow pin bit mask in a4
	"movi a5, 4096;" // blue pin bit mask in a5
	"movi a6, 12;" // delay loop counter
	"s32i a4, a3, 0;" // set yellow to LOW
	"memw;"
	"s32i a5, a2, 0;" // set blue to HIGH
	"memw;"
	"label1:"
	"addi a6, a6, -1;"
	"NOP;"
	"NOP;"
	"NOP;"
	"NOP;"
	"bnez a6, label1;"
	"movi a6, 12;" // delay loop counter
	"s32i a4, a2, 0;" // set yellow to HIGH
	"memw;"
	"s32i a5, a3, 0;" // set blue to LOW
	"memw;"
	"label2:"
	"addi a6, a6, -1;"
	"NOP;"
	"NOP;"
	"NOP;"
	"NOP;"
	"bnez a6, label2;"
	"movi a6, 12;" // delay loop counter
	"s32i a4, a3, 0;" // set yellow to LOW
	"memw;"
	"s32i a5, a3, 0;" // set blue to LOW
	"memw;"
	"label3:"
	"addi a6, a6, -1;"
	"NOP;"
	"NOP;"
	"NOP;"
	"NOP;"
	"bnez a6, label3;"
	"movi a6, 12;" // delay loop counter
	"s32i a4, a2, 0;" // set yellow to HIGH
	"memw;"
	"s32i a5, a2, 0;" // set blue to HIGH
	"memw;"
	"label4:"
	"addi a6, a6, -1;"
	"NOP;"
	"NOP;"
	"NOP;"
	"NOP;"
	"bnez a6, label4;"
	::
	: "a2", "a3", "a4", "a5", "a6", "memory"
	);
}
void setup()
{
	pinMode(YELLOW_pin, OUTPUT_OPEN_DRAIN);
	pinMode(BLUE_pin, OUTPUT_OPEN_DRAIN);
}
void loop()
{
	delay(10);
	toggle_blue_yellow__asm();
}