1 | void RFM12_ISR(void)
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2 | {
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3 | static uint8_t daten[32];
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4 | static uint8_t checksum = 0;
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5 | static uint8_t bytecount = 0;
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6 | uint8_t i, sensor_nr, byte;
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7 |
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8 | digitalWrite(RFM12_SCK, LOW); // CLK auf L
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9 | digitalWrite(RFM12_SDI, LOW); // DATA auf L
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10 | digitalWrite(RFM12_CS, LOW); // CS auf L
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11 |
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12 | byte = 0xB0; // Receive FIFO
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13 |
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14 | for (i = 0; i < 8; i++) // Kommando senden
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15 | {
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16 | if (byte & 0x80)
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17 | {
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18 | digitalWrite(RFM12_SDI, HIGH); // DATA auf H
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19 | }
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20 | else
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21 | {
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22 | digitalWrite(RFM12_SDI, LOW); // DATA auf L
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23 | }
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24 | digitalWrite(RFM12_SCK, HIGH); // Clock auf H
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25 | byte = (byte << 1); // nächstes Bit nach oben
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26 | digitalWrite(RFM12_SCK, LOW); // Clock auf L
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27 | }
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28 |
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29 | byte = 0;
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30 |
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31 | for (char j = 0; j < 8; j++)
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32 | {
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33 | byte = (byte << 1); // eins höher schieben
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34 | if (digitalRead(RFM12_SDO) == 1) // Bit 1?
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35 | {
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36 | byte = (byte | 0x01); // ja
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37 | }
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38 | digitalWrite(RFM12_SCK, HIGH); // CLK auf H
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39 | digitalWrite(RFM12_SCK, LOW); // CLK auf L
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40 | }
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41 | digitalWrite(RFM12_CS, HIGH); // CS auf H
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42 |
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43 | daten[bytecount] = byte; // Daten speichern
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44 | bytecount++;
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45 | checksum ^= byte; // XOR-Prüfsumme
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46 |
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47 | if (bytecount == PAKET_LEN) // fertig?
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48 | {
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49 | RFM12_send_cmd(0xCA81); // set FIFO mode
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50 | RFM12_send_cmd(0xCA83); // enable FIFO
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51 |
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52 | if (checksum == 0) // Checksumme ok?
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53 | {
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54 | sensor_nr = (daten[0] & 0x0F) - 1; // jetzt ab 0
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55 | if (sensor_nr < SENSOR_ANZ) // im gültigen Beeich?
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56 | {
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57 | daten[bytecount - 1] = 1; // 1 ins letzte Byte (Checksumme) für neue Daten
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58 | memcpy((void *) sensor[sensor_nr], (void const *) daten, PAKET_LEN);
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59 | }
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60 | }
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61 | checksum = 0;
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62 | bytecount = 0;
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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 | void RFM12_init(void)
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69 | {
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70 | pinMode(RFM12_CS, OUTPUT);
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71 | digitalWrite(RFM12_CS, HIGH);
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72 |
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73 | pinMode(RFM12_SDI, OUTPUT);
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74 | digitalWrite(RFM12_SDI, LOW);
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75 |
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76 | pinMode(RFM12_SCK, OUTPUT);
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77 | digitalWrite(RFM12_SCK, LOW);
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78 |
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79 | pinMode(RFM12_SDO, INPUT);
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80 | pinMode(RFM12_IRQ, INPUT_PULLUP);
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81 |
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82 | delay(200);
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83 |
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84 | RFM12_send_cmd(0x0000); // Status read
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85 |
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86 | RFM12_send_cmd(0xC080); // CLK-Frequenz / Batterie-Level
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87 | RFM12_send_cmd(0x80D7); // FIFO ein, TX-Regisrer ein, 433MHZ-Band, C = 12pF
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88 | RFM12_send_cmd(0xC2AB); // Clock Recovery Auto, Filter digital, DQD-Thresold 3
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89 | RFM12_send_cmd(0xCA81); // FIFO-Level 8 Bit, Sync Pattern ein, High senity Reset aus
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90 | RFM12_send_cmd(0xE000); // WakeUp aus
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91 | RFM12_send_cmd(0xC800); // Low Duty Cycle aus
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92 | RFM12_send_cmd(0xC4F3); // AFC immer, +7,5 / -10kHz, Add Freq-Offset zur PLL, Berechne Freq. Offset aus AFC // Status read
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93 | RFM12_send_cmd(0xA620); // Frequenz 433,92MHz // Status read
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94 | RFM12_send_cmd(0x948C); // VDI Output, VDI Fast, Bandbreite 200kHz, LBA-Gain -6dB, RSSI-Thresold -79dB
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95 | RFM12_send_cmd(0xC610); // Baudrate 19200 ->> stimmt nicht...
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96 | RFM12_send_cmd(0x8281); // Empfänger ein
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97 |
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98 | attachInterrupt(RFM12_IRQ, RFM12_ISR, FALLING);
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99 |
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100 | RFM12_send_cmd(0xCA81); // set FIFO mode
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101 | RFM12_send_cmd(0xCA83); // enable FIFO
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102 | }
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