Guten tag,
ich versuche gerade eine PS/2 Tastatur an meinem Atmega644-PA-PU zum
laufen zu bringen. Mein Problem ist wie ich aus den Bytes den Scanncode
heraus finden kann ? Zum Beispiel für a = 1C
Hier mein bisheriger Code:
1 | /*
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2 | * keyboard.c
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3 | *
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4 | * Created: 23.07.2013 14:47:48
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5 | * Author: repac3r
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6 | */
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7 |
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8 |
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9 | #include <avr/io.h>
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10 | #include <avr/interrupt.h>
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11 |
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12 | uint8_t bCounter;
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13 | uint8_t bStatus; //1->Start, 2->Data, 3->Pairty, 4->Stop
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14 | char kbd_data[8];
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15 |
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16 | ISR(PCINT0_vect)
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17 | {
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18 | if(bStatus == 0)
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19 | {
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20 | if(PINC &(1<<PC4))
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21 | {
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22 | bStatus = 1; //Startbit
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23 | }
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24 | }
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25 | else if(bStatus == 1 || bStatus == 2)
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26 | {
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27 | if(bCounter <= 7)
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28 | {
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29 | if((PINC &(1<<PC2)))
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30 | {
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31 | kbd_data[bCounter] = 1;
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32 | bCounter++;
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33 | }
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34 | else
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35 | {
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36 | kbd_data[bCounter] = 0;
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37 | bCounter++;
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38 | }
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39 |
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40 | }
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41 | else
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42 | {
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43 | bStatus = 3;
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44 | }
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45 | }
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46 | else if(bStatus == 3)
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47 | {
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48 | //Pairty witd nicht benutzt
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49 | bStatus == 4;
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50 | }
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51 | else if(bStatus == 4)
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52 | {
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53 | bStatus = 0;
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54 | bCounter = 0;
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55 | }
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56 | }
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57 |
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58 | int main(void)
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59 | {
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60 | bStatus = 0;
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61 | bCounter = 0;
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62 |
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63 | sei(); //Interrupts aktivieren
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64 |
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65 | PCICR |= (1<<PCIE0); //Pin Change Interrupt 0 aktivieren
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66 | PCMSK0 |= (1<<PCINT0); //Interrupt auf PCINT0
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67 |
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68 | DDRA &= ~((1<<PA0) | (1<<PA1)); //Ausgänge definieren (externe 4,7k Pullups aktiv)
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69 | while(1)
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70 | {
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71 | //TODO:: Please write your application code
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72 | }
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73 | }
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