1 | #include <avr/io.h>
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2 | #include <avr/interrupt.h>
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3 | #include "global.h"
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4 | #include "rf02.h"
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5 |
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6 | #include <util/delay.h>
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7 |
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8 | #define SDI_PORT PORTB
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9 | #define SDI_DDR DDRB
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10 | #define SDI_PIN PINB
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11 |
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12 | #define SCK_PORT PORTB
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13 | #define SCK_DDR DDRB
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14 | #define SCK_PIN PINB
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15 |
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16 | #define CS_PORT PORTD
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17 | #define CS_DDR DDRD
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18 | #define CS_PIN PIND
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19 |
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20 | #define IRQ_PORT PORTD
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21 | #define IRQ_DDR DDRD
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22 | #define IRQ_PIN PIND
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23 |
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24 | #define FSK_PORT PORTD
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25 | #define FSK_DDR DDRD
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26 | #define FSK_PIN PIND
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27 |
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28 | #define SDI 3 // SDI, -> RF02
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29 | #define SCK 5 // SCK, -> RF02
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30 | #define CS 2 // nSEL, -> RF02
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31 | #define FSK 7 // FSK, -> RF02
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32 | #define IRQ 2 // nIRQ, <- RF02
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33 |
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34 | // FSK: Pullup oder Pulldown
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35 |
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36 | void rf02_trans(unsigned short wert)
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37 | { unsigned char i;
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38 |
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39 | cbi(CS_PORT, CS);
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40 | for (i=0; i<16; i++)
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41 | { if (wert&32768)
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42 | sbi(SDI_PORT, SDI);
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43 | else
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44 | cbi(SDI_PORT, SDI);
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45 | sbi(SCK_PORT, SCK);
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46 | wert<<=1;
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47 | _delay_us(0.3);
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48 | cbi(SCK_PORT, SCK);
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49 | }
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50 | sbi(CS_PORT, CS);
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51 | }
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52 |
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53 | void rf02_init(void)
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54 | {
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55 | CS_PORT |= (1<<CS);
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56 | SDI_DDR |= (1<<SDI);
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57 | SCK_DDR |= (1<<SCK);
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58 | CS_DDR |= (1<<CS);
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59 | FSK_DDR |= (1<<FSK);
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60 | FSK_PORT |= (1<<FSK);
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61 |
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62 | for (unsigned char i=0; i<15; i++)
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63 | _delay_ms(10); // wait until POR done
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64 | rf02_trans(0xC0E0); // power settings
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65 | rf02_trans(0x8F80);
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66 | rf02_trans(0xC2A0); // enable tx sync bit, disable low bat detector
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67 | }
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68 |
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69 | void rf02_setmodfreq(unsigned char bandwidth)
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70 | {
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71 | rf02_trans(0x8F80|(bandwidth&7));
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72 | }
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73 |
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74 | void rf02_setfreq(unsigned short freq)
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75 | { if (freq<96) // 430,2400MHz
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76 | freq=96;
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77 | else if (freq>3903) // 439,7575MHz
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78 | freq=3903;
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79 | rf02_trans(0xA000|freq);
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80 | }
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81 |
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82 | void rf02_setpower(unsigned char power)
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83 | {
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84 | rf02_trans(0xB000|((power&7)<<8));
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85 | }
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86 |
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87 | void rf02_setbaud(unsigned short baud)
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88 | {
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89 | if (baud<1345)
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90 | baud=1345;
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91 | if (baud<19000)
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92 | rf02_trans(0xD240); // 25% PLL current
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93 | else if (baud<37000)
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94 | rf02_trans(0xD2C0); // 33% PLL current
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95 | else
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96 | rf02_trans(0xD200); // 50% PLL current
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97 | rf02_trans(0xC800|((344828UL/baud)-1)); // Baudrate= 344827,59/(R+1)
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98 | }
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99 |
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100 | void rf02_txdata(unsigned char *data, unsigned char number)
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101 | { unsigned char i,wert;
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102 | wert=0xC6;
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103 | cbi(CS_PORT, CS);
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104 | for (i=0; i<8; i++)
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105 | {
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106 | if (wert&128)
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107 | {
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108 | sbi(SDI_PORT, SDI);
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109 | }
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110 | else
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111 | {
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112 | cbi(SDI_PORT, SDI);
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113 | sbi(SCK_PORT, SCK);
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114 | wert<<=1;
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115 | _delay_us(0.2);
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116 | cbi(SCK_PORT, SCK);
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117 | }
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118 | }
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119 | rf02_shiftout(0xAA);
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120 | rf02_shiftout(0xAA);
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121 | rf02_shiftout(0xAA);
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122 | rf02_shiftout(0x2D);
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123 | rf02_shiftout(0xD4);
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124 | for (i=0; i<number; i++)
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125 | {
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126 | rf02_shiftout(*data++);
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127 | }
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128 | sbi(CS_PORT, CS);
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129 | while(IRQ_PIN&(1<<IRQ)); // wait until transfer done
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130 | rf02_trans(0xC464); // TX off after 10us
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131 | }
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132 |
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133 | void rf02_shiftout(unsigned char wert)
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134 | { unsigned char j;
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135 | for (j=0; j<8; j++)
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136 | {
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137 | while(IRQ_PIN&(1<<IRQ));
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138 | while(!(IRQ_PIN&(1<<IRQ)));
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139 | if (wert&128)
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140 | sbi(SDI_PORT, SDI);
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141 | else
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142 | cbi(SDI_PORT, SDI);
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143 | wert<<=1;
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144 | }
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145 | }
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