1 | #define F_CPU 16000000
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2 |
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3 | #include <avr/io.h>
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4 | #include <avr/interrupt.h>
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5 |
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6 | #define BAUD 9600
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7 | #define MYUBRR F_CPU/16/BAUD-1
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8 |
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9 | unsigned char UART_receive( void );
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10 | void UART_send( char data);
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11 |
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12 | void AVR_init(void) {
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13 |
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14 | /* Clock init done by FUSES, CLK = 16 MHz ext. Oscillator */
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15 |
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16 | /*LED PIN*/
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17 | /*---------------------------------------------------------*/
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18 | DDRB = (1 << PINB5);
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19 |
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20 | /* init UART asynchronous 9600 8Bits 1Stop */
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21 | /*---------------------------------------------------------*/
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22 | /*Set baud rate registers according to MYUBRR definition*/
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23 | UBRR0H = (unsigned char) (MYUBRR >> 8);
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24 | UBRR0L = MYUBRR;
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25 |
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26 | /* Enable receiver and transmitter */
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27 | UCSR0B = (1 << RXEN0) | (1 << TXEN0);
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28 |
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29 | /* Set frame format: 8data, 1stop bit */
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30 | UCSR0C = (0 << UMSEL00);
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31 | UCSR0C |= (0 << UCSZ00) | (1 << UCSZ01) | (1 << UCSZ00);
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32 |
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33 | /*init PWM, Timer*/
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34 | /*---------------------------------------------------------*/
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35 | /*Timer/Counte0 as PWM Waveform Generator on PD6/PD5 OC0A/OC0B (Arduino Pin 6, 5) (FAST PWM MODE 3)*/
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36 | DDRD = (1 << PIND6);
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37 | DDRD = (1 << PIND5);
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38 |
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39 | TCCR0A = (1 << COM0A1) | (0 << COM0A0);
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40 | TCCR0A |= (1 << COM0B1) | (0 << COM0B0);
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41 |
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42 | /*MODE 3: Fast PWM TOPP = 0xFF*/
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43 | TCCR0A |= (1 << WGM01) | (1 << WGM00);
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44 |
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45 | /* MODE 7 */
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46 | TCCR0B |= (0 << WGM02);
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47 |
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48 | /*Select CLK Source and Prescaler*/
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49 | /*Prescaler 1, 8, 64, 256, 1024*/
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50 | TCCR0B |= (0 << CS02) | (1 << CS01) | (0 << CS00);
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51 | // HIER GEHT WAS SCHIEF sobald ein CS0x bit gesetzt wird
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52 |
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53 | /*Interrupt enable*/
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54 | TIMSK0 = (1 << OCIE0A) | (1 << OCIE0B);
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55 |
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56 | /*This Register defines compare Match => Duty Cycle PWM Channel A in MODE 3 activated*/
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57 | /*This Register defines compare Match => Periode PWM Channel A in MODE 7 activated*/
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58 | OCR0A = 128;
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59 |
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60 | /*This Register defines compare Match => Duty Cycle PWM Channel B in MODE 3 activated*/
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61 | /*This Register defines compare Match => Duty Cycle PWM Channel A in MODE 7 activated*/
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62 | OCR0B = 64;
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63 |
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64 | /* MODE3: Output Waveform Frequency = F_CPU/Prescaler/256 */
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65 | /* MODE7: Output Waveform Frequency = F_CPU/2/Prescaler/(OCR0A+1) */
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66 |
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67 | sei();
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68 | };
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69 |
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70 | int main(void){
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71 |
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72 | AVR_init();
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73 |
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74 | while( 1 ) {
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75 | UART_send( UART_receive() );
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76 | }
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77 | }
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78 |
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79 | unsigned char UART_receive(void){
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80 | /* Wait for data to be received */
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81 | while (!(UCSR0A & (1<<RXC0)));
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82 | /* Get and return received data from buffer */
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83 | return UDR0;
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84 | };
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85 |
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86 | void UART_send( char data){
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87 | /* Wait for empty transmit buffer */
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88 | while (!(UCSR0A & (1<<UDRE0)));
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89 | /* Put data into buffer, sends the data */
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90 | UDR0 = data;
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91 | };
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