#define F_CPU 16000000UL // Assuming 16 MHz clock frequency


#include <avr/io.h>
#include <util/delay.h>

#define CLK_PIN PB0     // CLK pin connected to PB0
#define DIO_PIN PB1     // DIO pin connected to PB1

// Function to send a byte to TM1637
void sendByte(uint8_t byte) {
	for (uint8_t i = 0; i < 8; i++) {
		PORTB &= ~(1 << CLK_PIN); // CLK low
		if (byte & 0x01)
		PORTB |= (1 << DIO_PIN); // Set DIO high if the least significant bit of byte is 0
		else
		PORTB &= ~(1 << DIO_PIN); // Set DIO low if the least significant bit of byte is 1
		_delay_ms(50); // Adjust this delay if necessary
		PORTB |= (1 << CLK_PIN); // CLK high
		_delay_ms(50); // Adjust this delay if necessary
		byte >>= 1; // Shift to the next bit
	}
	PORTB &= ~(1 << CLK_PIN); // CLK low
	_delay_ms(50); // Adjust this delay if necessary
	PORTB |= (1 << CLK_PIN); // CLK high
	_delay_ms(50); // Adjust this delay if necessary
}

// Function to start signal
void startSignal() {
	PORTB &= ~(1 << DIO_PIN); // DIO low
	_delay_ms(5); // Adjust this delay if necessary
}

// Function to stop signal
void stopSignal() {
	PORTB &= ~(1 << CLK_PIN); // CLK low
	_delay_ms(5); // Adjust this delay if necessary
	PORTB |= (1 << CLK_PIN); // CLK high
	_delay_ms(5); // Adjust this delay if necessary
	PORTB |= (1 << DIO_PIN); // DIO high
	_delay_ms(50); // Adjust this delay if necessary
}

// Function to display digits on TM1637
void displayDigits(uint8_t digit0, uint8_t digit1, uint8_t digit2, uint8_t digit3) {
	startSignal();
	sendByte(0x40); // Data command: auto-increment address
	stopSignal();

	startSignal();
	sendByte(0xC0); // Address command: start from address 0xC0
	sendByte(digit0); // Send digit0
	sendByte(digit1); // Send digit1
	sendByte(digit2); // Send digit2
	sendByte(digit3); // Send digit3
	stopSignal();
}

int main(void) {
	PORTB |= (1 << CLK_PIN) | (1 << DIO_PIN); // Set CLK and DIO pins high
	DDRB |= (1 << CLK_PIN) | (1 << DIO_PIN); // Set CLK and DIO pins as output

	startSignal();
	sendByte(0b10001010);	// Helligkeit
	stopSignal();
	
	
	while (1) {
		// Display '1234' continuously
		displayDigits(0x3F, 0x06, 0x5B, 0x4F); // Corresponding codes for digits '1', '2', '3', '4'
		_delay_ms(1000);
	}

	return 0;
}