#include <Arduino.h>

/*
D7 - Ser (data)
D5 - clock
D1 - _OE
D2 - latch
D3 - _clear
*/

#define PIN_DATA D7
#define PIN_CLK D5
#define PIN_OE D1 //active low
#define PIN_LATCH D2
#define PIN_CLEAR D4 //active low

#define NUMPANELS 1
uint16_t dataRow = 0;
uint8_t dataControl = 0;
uint8_t dataColumn[NUMPANELS*7]; //raw data for shift register, 7bytes per panel (last 6 bits arent used)

void sr_clear();
void shiftOutSlow(uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder, uint8_t val);

unsigned long loopmillis=0;
unsigned long last_update=0;
#define UPDATE_INTERVAL 1000

void setup() {
    pinMode(PIN_DATA, OUTPUT);
    pinMode(PIN_CLK, OUTPUT);
    pinMode(PIN_OE, OUTPUT);
    pinMode(PIN_LATCH, OUTPUT);
    pinMode(PIN_CLEAR, OUTPUT);

    digitalWrite(PIN_OE, HIGH);
    digitalWrite(PIN_LATCH, LOW);
    sr_clear();

    Serial.begin(115200);
}

int countz=0;

void loop() {
    loopmillis = millis();
    if (loopmillis > last_update + UPDATE_INTERVAL) 
    {

        dataControl=0;
        #define CONTROL_LED 1
        #define CONTROL_CLEAR 128 //active low

        uint8_t selectedrow=0;
        dataRow=2^selectedrow; //test select one row
        

        if (countz%2==0) {
            Serial.println("0");
        }else{
            dataControl=CONTROL_LED;
            Serial.println("1");

        }

        //first shifted out bytes are farthest away in the line

        shiftOutSlow(PIN_DATA, PIN_CLK, MSBFIRST, dataControl); //Control. Bit 1 is Qa

        shiftOutSlow(PIN_DATA, PIN_CLK, MSBFIRST, dataControl); //Control. Bit 1 is Qa
        shiftOutSlow(PIN_DATA, PIN_CLK, MSBFIRST, (uint8_t)(dataRow>>8)); //High Byte
        shiftOutSlow(PIN_DATA, PIN_CLK, MSBFIRST, (uint8_t)dataRow); //Low Byte

        digitalWrite(PIN_LATCH, HIGH); //Latch data
        delayMicroseconds(1000);
        digitalWrite(PIN_LATCH, LOW);
        
        digitalWrite(PIN_OE, LOW); //activate output
        last_update=loopmillis;

        Serial.print("miau=");
        Serial.println(countz);
        countz++;
    }

    
}

void sr_clear() {
    digitalWrite(PIN_CLEAR, LOW);
    delayMicroseconds(1000);
    digitalWrite(PIN_CLEAR, HIGH);
}

void shiftOutSlow(uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder, uint8_t val)
{
	uint8_t i;

	for (i = 0; i < 8; i++)  {
		if (bitOrder == LSBFIRST)
			digitalWrite(dataPin, !!(val & (1 << i)));
		else	
			digitalWrite(dataPin, !!(val & (1 << (7 - i))));
			
        delayMicroseconds(100);
		digitalWrite(clockPin, HIGH);
        delayMicroseconds(100);
		digitalWrite(clockPin, LOW);		
        delayMicroseconds(100);
	}
}