Hallo ich will die Breite der Pulse (Pulse Width) des Ausgandsignals
meines IR-Empfänger messen und zwar mit dem Mikrocontroler C8051F340.
Die Messung sollte wie folgt erfolgen:
Pseudocode:
Set Timer ISR
If time High
Set time low, Run
Else
Set time High, Run
Aus dieses Pseudocode habe ich folgenden COde geschrieben:
1 | #include <c8051f340.h>
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2 | bit FLAG;
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3 | unsigned char CAPTURE;
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4 | unsigned char A;
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5 | unsigned char C;
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6 | unsigned char Pulse_Width;
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7 |
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8 |
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9 |
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10 | void port_init (void);
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11 | void pca_init (void);
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12 |
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13 | void main (void)
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14 | {
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15 |
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16 | port_init (); //
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17 | pca_init ();
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18 | PCA0MD &= ~0x40; // Disable Watchdog Timer
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19 |
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20 | // PCA Timer INIT:
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21 | PCA0MD = 0x00; // Input to timer 4 1/12 X Fosc
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22 | TH0 = 0x00; // High Byte
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23 | TL0 = 0x00; //Low Byte
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24 |
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25 | IE = 1;
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26 | //EIE1=1; // Enable External interrupt 1
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27 | EA = 1; // Enable all interrupts
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28 | ET0= 1; // Turn PCA timer 0 on
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29 | CR=1;
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30 |
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31 |
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32 | while (1){ } // wait of interrupt
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33 | //
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34 |
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35 | }
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36 |
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37 | void pca_init (void)
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38 | {
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39 | PCA0CN = 0x40; //
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40 | PCA0CPM0 = 0x21; //Capture positive edge first for measuring pulse width
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41 | PCA0MD = 0x00; //
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42 | FLAG=0;
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43 | }
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44 |
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45 | void port_init (void)
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46 | { P0SKIP = 0xff; //
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47 | P1SKIP = 0x03; //
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48 | P1MDOUT |= 0x04; //
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49 | }
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50 |
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51 |
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52 | void Int_0_ISR(void) interrupt 0
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53 | {
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54 | CCF0 =0; // Clear Module 0's event flag
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55 | if (FLAG==0) // Check if this is the first
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56 | {
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57 | // capture or second:
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58 | // FIRST CAPTURE:
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59 | CAPTURE = PCA0CPL0; // Save 16-bit capture value
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60 | PCA0CPH0 = CAPTURE+1;
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61 | PCA0CPM0 = 0x11; // Change module to now capture
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62 | // falling edges
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63 | FLAG = 1; //1st capture complete
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64 | }
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65 | else // SECOND CAPTURE:
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66 | {
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67 | Pulse_Width = CAPTURE - PCA0CPL0;
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68 | A = Pulse_Width+1;
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69 | C = PCA0CPH0 - CAPTURE;
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70 | A = C;
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71 | PCA0CPM0 = 0x21; //Optional: needed if user wants to
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72 | FLAG = 0; //measure next pulse width
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73 | }
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74 | }
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Aber die Code manchen leider gar nicht nach der Compilierung. Können mal
gucken und mir helfen?
Danke
armando
