1 | #include <avr/interrupt.h>
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2 | #include <portbits.h>
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3 |
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4 | #define INT_DDR DDRD
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5 | #define LED_0 PORTD_7
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6 | #define LED_1 PORTD_6
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7 |
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8 | volatile unsigned char Impuls_1s;
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9 | unsigned char Startwert_Timer_2;
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10 |
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11 | ISR(SIG_OVERFLOW2) // Interrupt Timer 2 --> 100Hz
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12 | {
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13 | TCNT2=Startwert_Timer_2; // Laden startwert T2
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14 | static unsigned char count0=0, count1=0;
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15 | if(count0++>=100){count0=1;LED_0=1;Impuls_1s=1;}
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16 | if (LED_0){if (count1++>=6){LED_0=0;count1=1;}}
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17 | }
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18 |
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19 |
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20 | unsigned char F_Verzoegerung(unsigned char takt, unsigned char Zeit)
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21 | {
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22 | static unsigned char Freigabe, Einschalt_Verzoegerung, First_Run;
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23 |
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24 | if(takt)
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25 | {
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26 | if (!First_Run){First_Run=1;Einschalt_Verzoegerung=Zeit;}
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27 | if(!Einschalt_Verzoegerung--) Freigabe=1;
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28 | }
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29 | return Freigabe;
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30 | }
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31 |
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32 |
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33 | int main(void)
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34 | {
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35 | unsigned char Freigabe_1, Freigabe_2,Sekundentakt;
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36 |
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37 | INT_DDR|=(1<<DDD6); // PORT D Ausgang
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38 | INT_DDR|=(1<<DDD7); // PORT D Ausgang
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39 |
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40 | // Timer 2 --> Bildung Sekundentakt (10ms / 100Hz)
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41 | TCCR2|=(1<<CS22) | (1<<CS21) | (1<<CS20); // Prescale = 1024
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42 | Startwert_Timer_2=246; // 100Hz
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43 | TCNT2=Startwert_Timer_2;
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44 | TIMSK|=(1<<TOIE2); // Interrupt freigeben (Owerflow)
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45 | sei(); // alle interrupts global freigeben
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46 |
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47 | while(1)
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48 | {
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49 | Freigabe_1=F_Verzoegerung(Sekundentakt,15);
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50 |
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51 | Freigabe_2=F_Verzoegerung(Sekundentakt,10);
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52 |
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53 | cli();
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54 | LED_1=Freigabe_1;
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55 | sei();
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56 | Sekundentakt=0;
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57 | if (Impuls_1s) {Sekundentakt=1; Impuls_1s=0;} // Sekundentakt aus ISR
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58 | }
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59 | }
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