1 | #include <avr/io.h>
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2 | #include <avr/interrupt.h>
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3 |
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4 |
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5 | volatile unsigned char ein;
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6 | unsigned char akku;
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7 |
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8 | void Konfiguration(void)
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9 | {
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10 | DDRB = 255; //PortB als Output konfigurieren
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11 | DDRD = 0; //PortD als Input konfigurieren
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12 |
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13 | EICRA |= (1<<ISC01); //INT0 gibt Interrupt bei fallender Flanke
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14 | EICRA |= (0<<ISC00);
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15 | EICRA |= (1<<ISC11); //INT1 gibt Interrupt bei fallender Flanke
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16 | EICRA |= (0<<ISC10);
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17 |
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18 | EIMSK |= (1<<INT0); //INT0 enabled
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19 | EIMSK |= (1<<INT1); //INT1 enabled
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20 |
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21 | UBRR0H = 0; //Baudrate = fosc/(16 (UBRR + 1))
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22 | UBRR0L = 9; //18,423MHz und 115200 Baud
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23 |
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24 | UCSR0C |= (1<<UCSZ01)|(1<<UCSZ00); //8Bit pro Word
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25 | UCSR0B |= (1<<TXEN0); //UART Sender ein
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26 | }
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27 |
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28 | void uart_putc(unsigned char data)
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29 | {
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30 | while (!(UCSR0A & (1<<UDRE0))); // Wait for previous transmission
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31 | UDR0 = 'A'; // Send data byte
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32 | }
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33 |
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34 |
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35 |
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36 | void main(void)
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37 | {
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38 | unsigned char zaehlera;
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39 | unsigned char zaehlerb;
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40 |
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41 | Konfiguration();
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42 |
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43 | zaehlera = 0;
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44 | zaehlerb = 0;
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45 | ein = 1;
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46 |
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47 | sei(); //Interrupts aktivieren
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48 |
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49 | while(1)
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50 | {
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51 | PORTB = 255 - akku;
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52 | if ((zaehlera == 0) & (ein == 1))
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53 | {
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54 | zaehlerb++;
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55 | if (zaehlerb ==0)
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56 | {
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57 | PORTB = 255 - akku;
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58 | uart_putc(akku);
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59 | akku++;
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60 | }
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61 | }
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62 | zaehlerb++;
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63 | zaehlera++;
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64 | }
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65 | }
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66 |
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67 | ISR(INT0_vect)
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68 | {
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69 | ein = 1;
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70 | }
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71 |
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72 | ISR(INT1_vect)
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73 | {
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74 | ein = 0;
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75 | }
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76 |
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77 | /*Baud UBRR % of error
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78 | 300 3839 0.0
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79 | 600 1919 0.0
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80 | 1200 959 0.0
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81 | 2400 479 0.0
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82 | 4800 239 0.0
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83 | 9600 119 0.0
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84 | 14400 79 0.0
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85 | 19200 59 0.0
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86 | 28800 39 0.0
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87 | 38400 29 0.0
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88 | 57600 19 0.0
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89 | 76800 14 0.0
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90 | 115200 9 0.0
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91 | 230400 4 0.0*/
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