From 2003938552ba3d41fecf685b9dde1ef1ecb9c2bc Mon Sep 17 00:00:00 2001
From: chrissy <chrissy@dm2lct.radio>
Date: Wed, 7 Oct 2026 00:12:45 +0200
Subject: [PATCH] initial commit, first Hardwaretest works

---
 Makefile                     |  23 ++
 src/.led_panel_example.c.swp | Bin 0 -> 20480 bytes
 src/.mqtt_ledpanel.c.swp     | Bin 0 -> 32768 bytes
 src/.si5351_rfgen.c.swp      | Bin 0 -> 16384 bytes
 src/led_panel_example.c      | 206 +++++++++++++++++
 src/mqtt_ledpanel.c          | 430 +++++++++++++++++++++++++++++++++++
 src/uart.h                   |  15 ++
 7 files changed, 674 insertions(+)
 create mode 100644 Makefile
 create mode 100644 src/.led_panel_example.c.swp
 create mode 100644 src/.mqtt_ledpanel.c.swp
 create mode 100644 src/.si5351_rfgen.c.swp
 create mode 100644 src/led_panel_example.c
 create mode 100644 src/mqtt_ledpanel.c
 create mode 100644 src/uart.h

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..4823d5e
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,23 @@
+PROGRAM_NAME = mqtt_ledpanel
+SRC_DIR = src
+BUILD_DIR = build
+
+all: $(PROGRAM_NAME)
+
+# Create the build directory
+$(BUILD_DIR):
+	mkdir -pv $(BUILD_DIR)
+
+# Compile and build the program for Atmega328P
+$(PROGRAM_NAME): $(BUILD_DIR)
+	avr-gcc -mmcu=atmega328p -Wall -Os -o $(BUILD_DIR)/$(PROGRAM_NAME).elf $(SRC_DIR)/$(PROGRAM_NAME).c
+
+	avr-objcopy -j .text -j .data -O ihex $(BUILD_DIR)/$(PROGRAM_NAME).elf $(BUILD_DIR)/$(PROGRAM_NAME).hex
+
+# Upload the built program (hex file) to Atmega328P using USBasp
+upload: $(PROGRAM_NAME)
+	avrdude -c arduino -p m328p -P /dev/ttyUSB0 -b 57600 -U flash:w:$(BUILD_DIR)/$(PROGRAM_NAME).hex -D
+
+# Remove build directory with all built files
+clean:
+	rm -rf $(BUILD_DIR) 
diff --git a/src/.led_panel_example.c.swp b/src/.led_panel_example.c.swp
new file mode 100644
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diff --git a/src/.mqtt_ledpanel.c.swp b/src/.mqtt_ledpanel.c.swp
new file mode 100644
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diff --git a/src/.si5351_rfgen.c.swp b/src/.si5351_rfgen.c.swp
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diff --git a/src/led_panel_example.c b/src/led_panel_example.c
new file mode 100644
index 0000000..ac4ea78
--- /dev/null
+++ b/src/led_panel_example.c
@@ -0,0 +1,206 @@
+#include <avr/io.h>
+#include <util/delay.h>
+#include <stdint.h>
+
+/// ATMEGA 328p
+
+#define ENABLE PD7 
+#define LATCH PB0 
+#define CLOCK PB1 
+
+#define ROT PD6 
+#define GRÜN PD5 
+#define BLAU PD4 
+
+
+
+
+
+
+
+void sendSPI (uint16_t SPIdata);
+
+	uint16_t count = 0;
+	uint16_t value ;
+		
+	uint16_t  	SPIstring [16];
+	uint16_t 	SPIbuffer = 0;
+	uint16_t 	SPIstring_count;
+	
+	uint8_t		bcd [5];
+		
+
+
+////////////////////////////////////////   M A I N   /////////////////////////////////////////////
+int main(void)
+{
+    
+    DDRD = 0xF0;		// PD0-3 als Eingang, PD4-7  als Ausgang setzen
+    DDRB = 0x0F;		// PB0-3 als Ausgang, PD4-7  als Ausgang setzen
+	PORTD = 0x0F;		// Pullup für PD0-3 aktivieren.
+	// Initialisierung des LED
+	PORTB |=  (1<<LATCH);	// ENABLE
+	
+	count = 0;
+	
+	
+//////////////////////MAIN Schleife ///////////////////////////				
+    while(1) 
+	{
+	_delay_ms (250); 		// Zyklusgeschwindigkeit von Hauptprogramm bestimmen.
+	
+	count++;
+	value = count;
+	
+	bcd[0] = value % 10;    value = value/10;
+	bcd[1] = value % 10;    value = value/10;
+	bcd[2] = value % 10;    value = value/10;
+	bcd[3] = value % 10;    value = value/10;
+	bcd[4] = value % 10;    
+	
+
+	LED_putC (bcd[3]);
+	LED_putC (bcd[2]);
+	LED_putC (bcd[1]);
+	LED_putC (bcd[0]);
+	LED_putC (bcd[3]);
+	LED_putC (bcd[2]);
+	LED_putC (bcd[1]);
+	LED_putC (bcd[0]);
+	SPIstring_count = 0;
+	
+	
+	
+	PORTD |=  (1<<ENABLE);	// ENABLE
+	sendSPI (SPIstring [0]);
+	sendSPI (SPIstring [1]);
+	sendSPI (SPIstring [2]);
+	sendSPI (SPIstring [3]);
+	sendSPI (SPIstring [4]);
+	sendSPI (SPIstring [5]);
+	sendSPI (SPIstring [6]);
+	sendSPI (SPIstring [7]);
+	sendSPI (SPIstring [8]);
+	sendSPI (SPIstring [9]);
+	sendSPI (SPIstring [10]);
+	sendSPI (SPIstring [11]);
+	sendSPI (SPIstring [12]);
+	sendSPI (SPIstring [13]);
+	sendSPI (SPIstring [14]);
+	sendSPI (SPIstring [15]);
+	
+	
+	
+	
+	
+	
+	
+	/*
+	setSPI (0x5552);	// "0" oben
+	setSPI (0x2232);	// "1" oben
+	setSPI (0x2452);	// "2" oben
+	setSPI (0x2452);	// "3" oben
+	
+	
+	
+	setSPI (0x0255);	// "0" unten
+	setSPI (0x0722);	// "1" unten
+	setSPI (0x0712);	// "2" unten
+	setSPI (0x0254);	// "3" unten
+	
+	
+	
+	
+	setSPI (0x7554);	// "4" oben
+	setSPI (0x3117);	// "5" oben
+	setSPI (0x3116);	// "6" oben
+	setSPI (0x2447);	// "7" oben
+	
+	
+	
+	
+	setSPI (0x0444);	// "4" unten
+	setSPI (0x0344);	// "5" unten
+	setSPI (0x0255);	// "6" unten
+	setSPI (0x0112);	// "7" unten
+
+	
+	setSPI (0x2552);	// "8" oben
+	setSPI (0x5552);	// "9" oben
+	setSPI (0x0000);	// " " oben
+	setSPI (0x0220);	// ":" oben
+		
+	setSPI (0x0255);	// "8" unten
+	setSPI (0x0346);	// "9" unten
+	setSPI (0x0000);	// " " unten
+	setSPI (0x0220);	// ":" unten
+
+*/
+	
+
+	PORTD &=  ~(1<<ENABLE);	// ENABLE
+	//_delay_us (250); 
+	//PORTD ^=  (1<<ENABLE);	// ENABLE
+	
+
+	}
+
+}
+/////////////////////////////////   E n d    o f   M A I N   /////////////////////////////////////
+
+
+////////////////////////////////   BCD to  bitmap converting  ///////////////////////////////////
+
+void  LED_putC (uint8_t putChar ){
+switch (putChar){
+		case 0: SPIstring[SPIstring_count] = 0x5552; SPIstring[SPIstring_count+4] = 0x0255; break;
+		case 1:	SPIstring[SPIstring_count] = 0x2232; SPIstring[SPIstring_count+4] = 0x0722;	break;
+		case 2:	SPIstring[SPIstring_count] = 0x2452; SPIstring[SPIstring_count+4] = 0x0712;	break;
+		case 3:	SPIstring[SPIstring_count] = 0x2452; SPIstring[SPIstring_count+4] = 0x0254;	break;
+		case 4:	SPIstring[SPIstring_count] = 0x7554; SPIstring[SPIstring_count+4] = 0x0444;	break;
+		case 5:	SPIstring[SPIstring_count] = 0x3117; SPIstring[SPIstring_count+4] = 0x0344;	break;
+		case 6:	SPIstring[SPIstring_count] = 0x3116; SPIstring[SPIstring_count+4] = 0x0255;	break;
+		case 7:	SPIstring[SPIstring_count] = 0x2447; SPIstring[SPIstring_count+4] = 0x0112;	break;
+		case 8:	SPIstring[SPIstring_count] = 0x2552; SPIstring[SPIstring_count+4] = 0x0255;	break;
+		case 9:	SPIstring[SPIstring_count] = 0x5552; SPIstring[SPIstring_count+4] = 0x0346;	break;
+		}
+		SPIstring_count++;
+		if (SPIstring_count &0x04) SPIstring_count = SPIstring_count + 4; 
+	}
+///////////////////////// END  of  Data to  bitmap converting  ///////////////////////////////////
+
+
+
+/////////////////////////////////SPI-STRING////////////////////////////////////////////
+// 		Hier wird 16bit-Daten & Takt & /CS an SPI-PORT rausschicken & gesteuert. 
+void sendSPI (uint16_t SPIdata){
+	SPIbuffer = SPIdata ;	// Daten an MAX504 anpassen, 2 bit nach links verschieben
+	
+	int ii=1;
+	while(ii <= 16) {				// 16mal wiederholen.
+		ii++;
+		PORTB &= ~(1 << PB1);		// Takt fallende Flanke
+		_delay_us (1);				// Verzögerung von 1µS
+		PORTD &= ~(1 << PD4);		// MOSI auf LOW
+		PORTD &= ~(1 << PD5);		// MOSI auf LOW
+		PORTD &= ~(1 << PD6);		// MOSI auf LOW
+		if (SPIbuffer &0x0001) {		// wenn 1, dann MOSI = H
+			PORTD |= (1 <<PD4) ;        
+			PORTD |= (1 <<PD5) ;        
+			PORTD |= (1 <<PD6) ;}        
+		SPIbuffer = SPIbuffer >> 1 ;	// Byte um 1 nach links verschieben
+		PORTB |= (1 <<PB1) ;		// Takt steigende Flanke
+		_delay_us (1);				// Verzögerung 1µS
+		}
+		
+	PORTD &= ~(1 << PD4);			// MOSI auf LOW
+	PORTD &= ~(1 << PD5);			// MOSI auf LOW
+	PORTD &= ~(1 << PD6);			// MOSI auf LOW
+	
+	
+	PORTB |= (1 <<PB0) ;			// /Latch auf HIGH
+	_delay_us (2);				// Verzögerung 1µS
+	PORTB &= ~(1 << PB0);  			// /Latch auf LOW
+	}
+//////////////////////////////END of SPI-STRING////////////////////////////////////////////////		
+	
diff --git a/src/mqtt_ledpanel.c b/src/mqtt_ledpanel.c
new file mode 100644
index 0000000..7724d65
--- /dev/null
+++ b/src/mqtt_ledpanel.c
@@ -0,0 +1,430 @@
+/*****************************************************************/
+/*             Comb generator with Si5153 and ATMega328PB        */
+/*  ************************************************************ */
+/*  Mikrocontroller:  ATMEL AVR ATmega328, 8 MHz                 */
+/*                                                               */
+/*  Compiler:         GCC (GNU AVR C-Compiler)                   */
+/*  Author:           Luzia Christiane Tesar                     */
+/*  Last Change:      2025-08-22                                */
+/*****************************************************************/
+
+// This is a minimal Firmware for the SI5351 Comb Generator
+// Developed 2025 at the chair of elektromagnetic theory and 
+// compatibility at TU Dresden
+// it enables basic interpretion of some SCPI-Style commands and a manual control of the generator using a rotary switch
+// The code snippet for the communication with the si5351 is a fork from DK7IH:
+// https://dk7ih.de/a-simple-software-to-control-the-si5351a-generator-chip/
+
+#define F_CPU 16000000UL
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <string.h>
+
+#include <stdint.h>
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <avr/sleep.h>
+#include <avr/eeprom.h>
+#include <util/delay.h>
+#include <util/atomic.h>
+#include "uart.h"
+
+#define BAUDRATE 9600
+#define TRUE 1
+#define FALSE 0
+
+#define CHAR_NEWLINE '\n'
+#define CHAR_RETURN '\r'
+#define RETURN_NEWLINE "\r\n"
+#define CR "\r\n"
+volatile unsigned char data_in[32];
+unsigned char command_in[32];
+
+volatile unsigned int data_count;
+volatile unsigned char command_ready;
+volatile unsigned char remote;
+
+//volatile char cmd[32], value[32], unit[32];
+unsigned long t1, freq;
+
+#define ENABLE PD7 
+#define LATCH PB0 
+#define CLOCK PB1 
+
+#define ROT PD6 
+#define GRÜN PD5 
+#define BLAU PD4 
+
+
+
+
+void sendSPI (uint16_t SPIdata);
+
+	uint16_t count = 0;
+	uint16_t value ;
+		
+	uint16_t  	SPIstring [16];
+	uint16_t 	SPIbuffer = 0;
+	uint16_t 	SPIstring_count;
+	
+	uint8_t		bcd [5];
+		
+
+
+////////////////////////////////   BCD to  bitmap converting  ///////////////////////////////////
+
+void  LED_putC (uint8_t putChar ){
+switch (putChar){
+		case 0: SPIstring[SPIstring_count] = 0x5552; SPIstring[SPIstring_count+4] = 0x0255; break;
+		case 1:	SPIstring[SPIstring_count] = 0x2232; SPIstring[SPIstring_count+4] = 0x0722;	break;
+		case 2:	SPIstring[SPIstring_count] = 0x2452; SPIstring[SPIstring_count+4] = 0x0712;	break;
+		case 3:	SPIstring[SPIstring_count] = 0x2452; SPIstring[SPIstring_count+4] = 0x0254;	break;
+		case 4:	SPIstring[SPIstring_count] = 0x7554; SPIstring[SPIstring_count+4] = 0x0444;	break;
+		case 5:	SPIstring[SPIstring_count] = 0x3117; SPIstring[SPIstring_count+4] = 0x0344;	break;
+		case 6:	SPIstring[SPIstring_count] = 0x3116; SPIstring[SPIstring_count+4] = 0x0255;	break;
+		case 7:	SPIstring[SPIstring_count] = 0x2447; SPIstring[SPIstring_count+4] = 0x0112;	break;
+		case 8:	SPIstring[SPIstring_count] = 0x2552; SPIstring[SPIstring_count+4] = 0x0255;	break;
+		case 9:	SPIstring[SPIstring_count] = 0x5552; SPIstring[SPIstring_count+4] = 0x0346;	break;
+		}
+		SPIstring_count++;
+		if (SPIstring_count &0x04) SPIstring_count = SPIstring_count + 4; 
+	}
+///////////////////////// END  of  Data to  bitmap converting  ///////////////////////////////////
+
+
+
+/////////////////////////////////SPI-STRING////////////////////////////////////////////
+// 		Hier wird 16bit-Daten & Takt & /CS an SPI-PORT rausschicken & gesteuert. 
+void sendSPI (uint16_t SPIdata){
+	SPIbuffer = SPIdata ;	// Daten an MAX504 anpassen, 2 bit nach links verschieben
+	
+	int ii=1;
+	while(ii <= 16) {				// 16mal wiederholen.
+		ii++;
+		PORTB &= ~(1 << PB1);		// Takt fallende Flanke
+		_delay_us (1);				// Verzögerung von 1µS
+		PORTD &= ~(1 << PD4);		// MOSI auf LOW
+		PORTD &= ~(1 << PD5);		// MOSI auf LOW
+		PORTD &= ~(1 << PD6);		// MOSI auf LOW
+		if (SPIbuffer &0x0001) {		// wenn 1, dann MOSI = H
+			PORTD |= (1 <<PD4) ;        
+			PORTD |= (1 <<PD5) ;        
+			PORTD |= (1 <<PD6) ;}        
+		SPIbuffer = SPIbuffer >> 1 ;	// Byte um 1 nach links verschieben
+		PORTB |= (1 <<PB1) ;		// Takt steigende Flanke
+		_delay_us (1);				// Verzögerung 1µS
+		}
+		
+	PORTD &= ~(1 << PD4);			// MOSI auf LOW
+	PORTD &= ~(1 << PD5);			// MOSI auf LOW
+	PORTD &= ~(1 << PD6);			// MOSI auf LOW
+	
+	
+	PORTB |= (1 <<PB0) ;			// /Latch auf HIGH
+	_delay_us (2);				// Verzögerung 1µS
+	PORTB &= ~(1 << PB0);  			// /Latch auf LOW
+	}
+//////////////////////////////END of SPI-STRING////////////////////////////////////////////////		
+
+/////////////////////
+//
+//   TWI-Functions
+//
+/////////////////////
+void twi_init(void)
+{
+    //set SCL to 400kHz
+    TWSR = 0x00;
+    TWBR = 0x0C;
+	
+    //enable TWI
+    TWCR = (1<<TWEN);
+}
+
+//Send start signal
+void twi_start(void)
+{
+    TWCR = (1<<TWINT)|(1<<TWSTA)|(1<<TWEN);
+    while ((TWCR & (1<<TWINT)) == 0);
+}
+
+//send stop signal
+void twi_stop(void)
+{
+    TWCR = (1<<TWINT)|(1<<TWSTO)|(1<<TWEN);
+}
+
+void twi_write(uint8_t u8data)
+{
+    TWDR = u8data;
+    TWCR = (1<<TWINT)|(1<<TWEN);
+    while ((TWCR & (1<<TWINT)) == 0);
+}
+
+
+/////////////////////////////////////////////
+//              M  I  S  C  
+/////////////////////////////////////////////
+//Substitute defective _delay_ms() function in delay.h
+void wait_ms(int ms)
+{
+    int t1, t2;
+    int dtime = (int) 137 * 8;
+
+    for(t1 = 0; t1 < ms; t1++)
+    {
+        for(t2 = 0; t2 < dtime; t2++)
+        {
+            asm volatile ("nop" ::);
+        }
+    }        
+}
+
+/////////////////////////////////////////////
+//              U  A  R  T  
+/////////////////////////////////////////////
+
+void uart_init (void)
+{
+    //uint8_t sreg = SREG;
+    uint16_t ubrr = (uint16_t) ((uint32_t) F_CPU/(16UL*BAUDRATE) - 1);
+
+    UBRR0H = (uint8_t) (ubrr>>8);
+    UBRR0L = (uint8_t) (ubrr);
+    // Interrupts kurz deaktivieren 
+    cli();
+    // UART Receiver und Transmitter anschalten, Receive-Interrupt aktivieren 
+    // Data mode 8N1, asynchron 
+    UCSR0B = (1 << RXEN0) | (1 << TXEN0) | (1 << RXCIE0);
+    UCSR0C = (0 << 4) | (0 << 3) | (3 << 1);
+    // Flush Receive-Buffer (entfernen evtl. vorhandener ungültiger Werte) 
+    do
+    {
+        // UDR auslesen (Wert wird nicht verwendet) 
+        UDR0;
+    }
+    while (UCSR0A & (1 << RXC0));
+
+    // Rücksetzen von Receive und Transmit Complete-Flags 
+    UCSR0A = (1 << RXC0) | (1 << TXC0);
+
+}
+
+
+int uart_putc (const uint8_t c)
+{
+	    // Warten, bis UDR bereit ist für einen neuen Wert
+    while (!(UCSR0A & (1 << UDRE0)))
+        ;
+
+    // UDR Schreiben startet die Übertragung
+    UDR0 = c;
+
+    return 1;
+}
+
+void uart_puts (const char *s)
+{
+    do
+    {
+        uart_putc (*s);
+    }
+    while (*s++);
+}
+
+
+void usart_ok()
+{
+    uart_puts("OK\r\n");
+}
+
+void copy_command ()
+{
+    // The USART might interrupt this - don't let that happen!
+    ATOMIC_BLOCK(ATOMIC_FORCEON) {
+        // Copy the contents of data_in into command_in
+        memcpy(command_in, data_in, 32);
+
+        // Now clear data_in, the USART can reuse it now
+        memset(data_in, 0, 32);
+    }
+}
+
+//void split_command(char str[]){
+//	str[strlen(str)-1] = '\0';
+//	strcpy(cmd, strtok(str , " "));
+//    	strcpy(value, strtok(NULL, " "));
+//    	strcpy(unit , strtok(NULL, " "));
+//}
+
+////////////////////////////////////////   M A I N   /////////////////////////////////////////////
+int main(void)
+{
+    
+    DDRD = 0xF0;		// PD0-3 als Eingang, PD4-7  als Ausgang setzen
+    DDRB = 0x0F;		// PB0-3 als Ausgang, PD4-7  als Ausgang setzen
+	PORTD = 0x0F;		// Pullup für PD0-3 aktivieren.
+	// Initialisierung des LED
+	PORTB |=  (1<<LATCH);	// ENABLE
+	
+	count = 0;
+	
+	
+//////////////////////MAIN Schleife ///////////////////////////				
+    while(1) 
+	{
+	_delay_ms (250); 		// Zyklusgeschwindigkeit von Hauptprogramm bestimmen.
+	
+	count++;
+	value = count;
+	
+	bcd[0] = value % 10;    value = value/10;
+	bcd[1] = value % 10;    value = value/10;
+	bcd[2] = value % 10;    value = value/10;
+	bcd[3] = value % 10;    value = value/10;
+	bcd[4] = value % 10;    
+	
+
+	LED_putC (bcd[3]);
+	LED_putC (bcd[2]);
+	LED_putC (bcd[1]);
+	LED_putC (bcd[0]);
+	LED_putC (bcd[3]);
+	LED_putC (bcd[2]);
+	LED_putC (bcd[1]);
+	LED_putC (bcd[0]);
+	SPIstring_count = 0;
+	
+	
+	
+	PORTD |=  (1<<ENABLE);	// ENABLE
+	sendSPI (SPIstring [0]);
+	sendSPI (SPIstring [1]);
+	sendSPI (SPIstring [2]);
+	sendSPI (SPIstring [3]);
+	sendSPI (SPIstring [4]);
+	sendSPI (SPIstring [5]);
+	sendSPI (SPIstring [6]);
+	sendSPI (SPIstring [7]);
+	sendSPI (SPIstring [8]);
+	sendSPI (SPIstring [9]);
+	sendSPI (SPIstring [10]);
+	sendSPI (SPIstring [11]);
+	sendSPI (SPIstring [12]);
+	sendSPI (SPIstring [13]);
+	sendSPI (SPIstring [14]);
+	sendSPI (SPIstring [15]);
+	
+	
+	
+	
+	
+	
+	
+	/*
+	setSPI (0x5552);	// "0" oben
+	setSPI (0x2232);	// "1" oben
+	setSPI (0x2452);	// "2" oben
+	setSPI (0x2452);	// "3" oben
+	
+	
+	
+	setSPI (0x0255);	// "0" unten
+	setSPI (0x0722);	// "1" unten
+	setSPI (0x0712);	// "2" unten
+	setSPI (0x0254);	// "3" unten
+	
+	
+	
+	
+	setSPI (0x7554);	// "4" oben
+	setSPI (0x3117);	// "5" oben
+	setSPI (0x3116);	// "6" oben
+	setSPI (0x2447);	// "7" oben
+	
+	
+	
+	
+	setSPI (0x0444);	// "4" unten
+	setSPI (0x0344);	// "5" unten
+	setSPI (0x0255);	// "6" unten
+	setSPI (0x0112);	// "7" unten
+
+	
+	setSPI (0x2552);	// "8" oben
+	setSPI (0x5552);	// "9" oben
+	setSPI (0x0000);	// " " oben
+	setSPI (0x0220);	// ":" oben
+		
+	setSPI (0x0255);	// "8" unten
+	setSPI (0x0346);	// "9" unten
+	setSPI (0x0000);	// " " unten
+	setSPI (0x0220);	// ":" unten
+
+*/
+	
+
+	PORTD &=  ~(1<<ENABLE);	// ENABLE
+	//_delay_us (250); 
+	//PORTD ^=  (1<<ENABLE);	// ENABLE
+	
+
+	}
+
+}
+
+//int main(void)
+//{
+//	//char string[]="Hello world!!";
+//	uart_init();
+//	//uart_puts(string);
+//	sei();
+//	//PORTC = 0x30;//I²C-Bus lines: PC4=SDA, PC5=SCL 
+//	DDRB = ( 1 << PB5 );        // PB0 an PORTB als Ausgang setzen
+//
+//    while( 1 ) {                // Endlosschleife
+//	if (command_ready == TRUE) {
+//		copy_command();
+//		if (strcmp(command_in, "1\r")==0) {
+//        		PORTB |= ( 1 << PB5 );  // Toggle PB0 z.B. angeschlossene LED
+//		}
+//		if (strcmp(command_in, "0\r")==0) {
+//        		PORTB &= ~( 1 << PB5 );  // Toggle PB0 z.B. angeschlossene LED
+//			uart_puts("Miau\r\n");
+//		}
+//        	command_ready = FALSE;
+//        }
+//        //_delay_ms(1000);        // Eine Sekunde +/-1/10000 Sekunde warten...
+//				
+//	//twi_init();
+//   }
+//
+//    return 0;
+//}
+
+/////////////////////////////////   E n d    o f   M A I N   /////////////////////////////////////
+
+	
+ISR(USART_RX_vect)
+{
+	// Get data from the USART in register
+    	data_in[data_count] = UDR0;
+
+	// End of line!
+    	if (data_in[data_count] == '\r') {
+        	command_ready = TRUE;
+		uart_puts("miau\r\n");
+		// Reset to 0, ready to go again
+        	data_count = 0;
+	} else {
+        	data_count++;
+
+
+
+		
+    }
+}
+
+
diff --git a/src/uart.h b/src/uart.h
new file mode 100644
index 0000000..3dabd6a
--- /dev/null
+++ b/src/uart.h
@@ -0,0 +1,15 @@
+#ifndef UART_H
+#define UART_H
+
+#include <avr/io.h>
+
+extern void uart_init (void);
+extern int uart_putc (const uint8_t);
+extern char uart_getc (void);
+
+static inline void uart_flush (void)
+{
+	while (UCSR0B & (1 << UDRIE0));
+}
+
+#endif /* UART_H */