1 | C-Code
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2 |
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3 | ISR(INT2_vect) {
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4 | DDRD = 0xFF; //Data out
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5 | PORTC = VIA_CHIP_SEL + VIA_T2C_L * 4;
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6 | VIA_WRITE();
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7 | PORTD = 0x9;
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8 | _delay_us(20); //settle down
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9 |
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10 | PORTC = VIA_CHIP_SEL + VIA_T2C_H * 4;
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11 | VIA_WRITE();
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12 | PORTD = 0x0;
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13 | _delay_us(20); //settle down
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14 | DDRD = 0x0; //Data in for next read cycle
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15 | IRQflag6522 = 1; // <- kommt in Hauptprogramm nicht an. Zeitkritisch?
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16 |
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17 | }
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18 |
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19 | im Moment ruft main nur:
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20 |
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21 | while (1) {
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22 | read6522Register2();
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23 | }
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24 |
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25 |
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26 | /************************************************************************
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27 | *
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28 | * read6522Register2: 6522 register dump
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29 | * blank = xx bewirkt austasten (blinken) des zu editierenden Inhalts
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30 | *
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31 | ************************************************************************/
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32 | void read6522Register2 (void) {
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33 | unsigned int T2 = 0;
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34 | static uint16_t irq6522 = 0;
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35 |
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36 | static int8_t count1 = 0; //blink 5x
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37 | static int8_t count2 = 1; //15 items
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38 | static unsigned long old = 0;
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39 |
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40 |
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41 | //Timer ISR, calculate a nick of time
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42 | if ((eternal - old) == 1) {
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43 | count1++;
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44 | }
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45 | old = eternal;
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46 |
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47 | if (count1 == (2*5)) {
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48 | count1 = 0;
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49 | count2++;
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50 | }
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51 |
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52 | if (blink == 1) {
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53 | blank = count2;
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54 | }
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55 | else blank = 0;
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56 | if (count2 > 15) count2 = 1;
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57 |
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58 |
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59 | regStatus = read6522 (VIA_IOR_A);
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60 | convDecToHex (255-regStatus);
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61 | if (blank == 1 ) SendAscii(Touch160x104, 4* FONTWIDTH , 1*FONTHEIGHT," ");
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62 | else SendAscii(Touch160x104, 4* FONTWIDTH , 1*FONTHEIGHT, buf2);
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63 |
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64 | .
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65 | .
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66 | .
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67 |
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68 | regStatus = read6522 (VIA_T2C_H);
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69 | T2 = 65535 - (256 * regStatus + T2) ;
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70 | convDecToHex (regStatus);
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71 | if (blank == 14) SendAscii(Touch160x104, 8*FONTWIDTH , 7*FONTHEIGHT, " ");
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72 | else SendAscii(Touch160x104, 8*FONTWIDTH , 7*FONTHEIGHT, buf2);
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73 | regStatus = read6522 (VIA_T2C_L);
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74 | T2 = regStatus;
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75 | convDecToHex (regStatus);
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76 | if (blank == 15) SendAscii(Touch160x104, 10*FONTWIDTH +3, 7*FONTHEIGHT , " ");
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77 | else SendAscii(Touch160x104, 10*FONTWIDTH +3, 7*FONTHEIGHT , buf2);
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78 |
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79 |
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80 | //check for interrupts ...funktioniert nicht
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81 | if (IRQflag6522) {
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82 | sprintf( buf1, "IRQs: %i", ++irq6522); //
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83 | SendAscii(Touch160x104, 0, 8*FONTHEIGHT, buf1);
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84 | IRQflag6522 = 0; //release
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85 | }
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