1 | #include "rfm12b.h"
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2 | // send and receive a 16bit-word via spi
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3 | uint16_t RFM12B_spi(uint16_t cmd)
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4 | {
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5 | uint8_t i;
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6 | uint16_t recv = 0;
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7 | // start communication
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8 | RFM12B_SCK_LOW();
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9 | RFM12B_SS_LOW();
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10 | // read 16 bits
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11 | for(i=0; i<16; i++)
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12 | {
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13 | // send bit
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14 | if(cmd & 0x8000)
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15 | RFM12B_MOSI_HIGH();
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16 | else
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17 | RFM12B_MOSI_LOW();
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18 | // clock
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19 | RFM12B_SCK_HIGH();
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20 | recv<<=1;
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21 | // receive bit
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22 | if(RFM12B_MISO_HIGH())
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23 | {
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24 | recv|=0x0001;
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25 | }
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26 | // clock
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27 | RFM12B_SCK_LOW();
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28 | cmd<<=1;
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29 | }
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30 | // end communication
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31 | RFM12B_SS_HIGH();
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32 | return recv;
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33 | }
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34 | // initialize hardware (atmel) (CHECKED)
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35 | void RFM12B_init_hard()
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36 | {
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37 | // set default values
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38 | RFM12B_SS_HIGH();
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39 | RFM12B_MOSI_HIGH();
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40 | RFM12B_SCK_LOW();
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41 | // init ports
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42 | RFM12B_SCK_INIT();
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43 | RFM12B_MOSI_INIT();
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44 | RFM12B_MISO_INIT();
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45 | RFM12B_SS_INIT();
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46 | }
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47 | // initialize software (rfm12b) (CHECKED)
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48 | void RFM12B_init_soft()
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49 | {
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50 | RFM12B_spi(0x80D7);//EL,EF,433band,12.0pF
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51 | RFM12B_spi(0x8239);//!er,!ebb,ET,ES,EX,!eb,!ew,DC
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52 | /* RFM12B_spi(0xA640);//434MHz*/
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53 | RFM12B_spi(0xA74E);//869,35 MHz
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54 | RFM12B_spi(0xC647);//4.8kbps
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55 | RFM12B_spi(0x94A0);//VDI,FAST,134kHz,0dBm,-103dBm
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56 | RFM12B_spi(0xC2AC);//AL,!ml,DIG,DQD4
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57 | RFM12B_spi(0xCA81);//FIFO8,SYNC,!ff,DR
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58 | RFM12B_spi(0xCED4);//SYNC=2DD4;
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59 | RFM12B_spi(0xC483);//@PWR,NO RSTRIC,!st,!fi,OE,EN
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60 | /* RFM12B_spi(0x9850);//!mp,90kHz,MAX OUT*/
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61 | RFM12B_spi(0x9820);//!mp,45kHz,MAX OUT*/
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62 | RFM12B_spi(0xCC77);//OB1,OB0, LPX,!ddy,DDIT,BW0
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63 | RFM12B_spi(0xE000);//NOT USE
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64 | RFM12B_spi(0xC800);//NOT USE
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65 | RFM12B_spi(0xC040);//1.66MHz,2.2V
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66 | }
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67 | // send a byte (CHECKED)
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68 | // uint8_t data data to send
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69 | void RFM12B_put(uint8_t data)
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70 | {
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71 | RFM12B_WAIT_RGIT();
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72 | RFM12B_spi(0xB800 + data);
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73 | }
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74 | // receive a byte (CHECKED)
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75 | uint8_t RFM12B_get()
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76 | {
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77 | RFM12B_WAIT_FFIT();
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78 | return RFM12B_spi(0xB000) & 0x00FF;
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79 | }
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80 | // transmit multiple bytes (CHECKED)
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81 | // uint8_t data[] data to transmit
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82 | // uint8_t length length of the data to transmit
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83 | void RFM12B_transmit(uint8_t data[], uint8_t length)
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84 | {
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85 | uint8_t i;
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86 | // enable TX
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87 | RFM12B_spi(0x8238);
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88 | RFM12B_put(0xAA);
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89 | RFM12B_put(0xAA);
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90 | RFM12B_put(0xAA);
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91 | RFM12B_put(0x2D);
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92 | RFM12B_put(0xD4);
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93 | for(i = 0; i < length; i++)
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94 | {
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95 | RFM12B_put(data[i]);
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96 | }
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97 | RFM12B_WAIT_RGIT();
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98 | // disable TX
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99 | RFM12B_spi(0x8208);
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100 | }
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101 | // receive multiple bytes (CHECKED)
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102 | // uint8_t data[] buffer for received data
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103 | // uint8_t length length of data to receive
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104 | void RFM12B_receive(uint8_t *data, uint8_t length)
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105 | {
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106 | uint8_t i;
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107 | // enable RX
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108 | RFM12B_spi(0x82C8);
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109 | // set FIFO mode
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110 | RFM12B_spi(0xCA81);
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111 | // enable FIFO
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112 | RFM12B_spi(0xCA83);
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113 | for(i = 0; i < length; i++)
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114 | {
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115 | data[i] = RFM12B_get();
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116 | }
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117 | RFM12B_WAIT_FFIT();
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118 | // disable RX
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119 | RFM12B_spi(0x8208);
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120 | }
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