Hallo!
Habe ein kleines Problem:
Wenn ich vom Computer eine '9' sende, will ich, dass der AVR eine '9'
zurücksendet.
Leider funktioniert der Code nicht - vielleicht kann mir wer helfen,
danke!
1 | #include <avr/io.h>
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2 | #include <avr/interrupt.h>
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3 | #include <util/delay.h>
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4 |
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5 | extern void init_io(void);
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6 | void USART_Init( unsigned int baud );
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7 | void USART_Transmit( unsigned int data );
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8 | unsigned char USART_Receive( void );
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9 |
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10 | int x;
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11 | unsigned char zeichen;
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12 |
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13 | int main(void)
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14 | {
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15 | //cli();
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16 | init_io();
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17 | //init_timer0();
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18 | //sei();
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19 |
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20 | USART_Init(9600);
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21 |
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22 | for(x=0;x<3;x++)
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23 | {
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24 | PORTD|=(1<<PD6);
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25 | _delay_ms(200);
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26 | PORTD &=~(1<<PD6);
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27 | _delay_ms(200);
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28 | }
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29 |
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30 | USART_Transmit('9');
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31 |
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32 | while(1)
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33 | {
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34 | PORTD|=(1<<PD6);
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35 | if(PINB & (1<<PINB0))
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36 | {
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37 | USART_Transmit('1');
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38 | while(PINB & (1<<PINB0));
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39 | _delay_ms(300);
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40 | }
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41 | if(PINB & (1<<PINB1))
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42 | {
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43 | USART_Transmit('2');
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44 | while(PINB & (1<<PINB1));
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45 | _delay_ms(300);
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46 | }
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47 | if(PINB & (1<<PINB2))
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48 | {
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49 | USART_Transmit('3');
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50 | while(PINB & (1<<PINB2));
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51 | _delay_ms(300);
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52 | }
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53 | if(PINB & (1<<PINB3))
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54 | {
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55 | USART_Transmit('4');
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56 | while(PINB & (1<<PINB3));
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57 | _delay_ms(300);
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58 | }
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59 | zeichen=USART_Receive();
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60 | }
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61 | }
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62 |
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63 |
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64 | //-------
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65 | //INIT_IO
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66 | //-------
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67 | //Initialisierung der Port-Pins
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68 | void init_io(void)
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69 | {
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70 | DDRD |= 0xFF;
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71 | DDRB |= 0x00;
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72 | }
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73 |
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74 | void USART_Init( unsigned int baud )
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75 | {
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76 |
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77 | UBRRH = 0;
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78 | UBRRL = 12;
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79 | /* Enable receiver and transmitter */
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80 | UCSRB = (1<<RXEN)|(1<<TXEN);
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81 | /* Set frame format: 8data, 2stop bit */
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82 | UCSRC = (1<<USBS)|(3<<UCSZ0);
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83 | }
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84 |
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85 | void USART_Transmit( unsigned int data )
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86 | {
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87 | while (!(UCSRA & (1<<UDRE))) /* warten bis Senden moeglich */
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88 | {
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89 | }
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90 |
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91 | UDR = data; /* schreibt das Zeichen x auf die Schnittstelle */
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92 |
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93 | }
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94 |
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95 | unsigned char USART_Receive( void )
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96 | {
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97 | /* Wait for data to be received */
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98 | while ( !(UCSRA & (1<<RXC)) )
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99 | /* Get and return received data from buffer */
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100 | zeichen=UDR;
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101 | if (zeichen == '9')
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102 | {
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103 | USART_Transmit('9');
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104 | }
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105 | zeichen='0';
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106 | return zeichen;
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107 | }
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