1 | #include <util/delay.h>
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2 | #include <avr/interrupt.h>
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3 | #include <avr/io.h>
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4 | #include <util/delay.h>
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5 |
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6 |
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7 | //eigene defines, nicht verändern!
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8 | #define DDR(x) (*(&x - 1))
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9 | #define AUS 0
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10 | #define SINUS 1
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11 | #define RECHTECK 2
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12 | #define RECHTECK2 3
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13 | #define DREIECK 4
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14 | #define B28 13
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15 | #define HLB 12
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16 | #define FSELECT 11
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17 | #define PSELECT 10
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18 | #define RESET 8
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19 | #define SLEEP1 7
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20 | #define SLEEP12 6
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21 | #define OPBITEN 5
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22 | #define DIV2 3
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23 | #define MODE 1
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24 | #define FREQ0 18
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25 | #define FREQ1 28
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26 | #define PHASE0 38
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27 | #define PHASE1 48
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28 | #define pi2 6.2832
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29 |
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30 | /*************************************Konfiguration***************************************/
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31 | //MasterClock des AD9833
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32 | #define MCLK 25000000
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33 |
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34 | //SPI - SS muss den gleichen Port haben wie der Hardware SPI
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35 | #define SPIPORT PORTB
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36 | #define MOSI 5
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37 | #define SCK 7
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38 | #define SS 4
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39 | /*************************************Konfiguration***************************************/
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40 |
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41 | //enthält den momentanen Status des AD9833
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42 | uint16_t stats = 0;
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43 | uint16_t tosend = 0;
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44 | double konst = 268435456; //2^28, (1<<28)
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45 | float konst2 = 4096; //2^12, (1<<12);
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46 |
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47 | //schreibt ein Wort in den AD9833
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48 | void DDS_write(uint16_t data){
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49 | SPIPORT &= ~(1<<SS);
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50 | SPDR = (uint8_t)(data>>8);
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51 | while(!(SPSR & (1<<SPIF)))
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52 | ;
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53 | SPDR = (uint8_t)(data & 255);
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54 | while(!(SPSR & (1<<SPIF)))
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55 | ;
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56 | SPIPORT |= (1<<SS);
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57 | }
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58 |
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59 | //resettet den Zähler des AD9833 und schaltte ihn ab, DAC getrennt
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60 | void DDS_off(void){
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61 | //complete word write, Counter reset, MCLK Off, DAC disconnected, SINROM bypass
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62 | stats = (1<<B28) | (1<<RESET) | (1<<SLEEP1) | (1<<OPBITEN) | (1<<MODE);
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63 | DDS_write(stats);
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64 | stats &= ~(1<<RESET);
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65 | _delay_ms(1);
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66 | DDS_write(stats);
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67 | }
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68 |
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69 | //initilaisiert den Hardware SPI und den AD9833
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70 | void DDS_init(void){
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71 | //SPI Init
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72 | DDR(SPIPORT) |= (1<<MOSI) | (1<<SCK) | (1<<SS);
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73 | SPIPORT |= (1<<SS);
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74 | //MSB zuerst, Master, SCK Idle High, CLK/16
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75 | SPCR = (1<<SPE)| (1<<MSTR) | (1<<CPOL) | (1<<SPR0);
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76 | //DDS Init
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77 | DDS_off();
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78 | }
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79 |
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80 | //schaltet die Signalform des AD9833 um
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81 | //SINUS, DREIECK, RECHTECK, RECHTECK2, AUS
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82 | void DDS_signal (uint8_t signal){
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83 | switch (signal){
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84 | case AUS:
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85 | DDS_off();
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86 | break;
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87 | case SINUS:
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88 | stats &= ~((1<<OPBITEN) | (1<<MODE) | (1<<SLEEP1));
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89 | break;
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90 | case RECHTECK2:
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91 | stats &= ~((1<<MODE) | (1<<DIV2) | (1<<SLEEP1));
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92 | stats |= (1<<OPBITEN);
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93 | break;
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94 | case RECHTECK:
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95 | stats |= (1<<OPBITEN) | (1<<DIV2);
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96 | stats &= ~((1<<MODE) | (1<<SLEEP1));
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97 | break;
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98 | case DREIECK:
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99 | stats &= ~((1<<OPBITEN) | (1<<SLEEP1));
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100 | stats |= (1<<MODE);
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101 | break;
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102 | default:
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103 | stats |= (1<<OPBITEN) | (1<<MODE);
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104 | }
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105 | DDS_write(stats);
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106 | }
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107 |
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108 | //Auswahl des AD9833 Registers, welches für die Frequenz/Phase zuständig ist
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109 | //FREQ0, FREQ1, PHASE0, PHASE1
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110 | void DDS_reg(uint8_t reg){
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111 | switch (reg){
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112 | case FREQ0:
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113 | stats &= ~(1<<FSELECT);
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114 | break;
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115 | case FREQ1:
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116 | stats |= (1<<FSELECT);
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117 | break;
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118 | case PHASE0:
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119 | stats &= ~(1<<PSELECT);
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120 | break;
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121 | case PHASE1:
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122 | stats |= (1<<PSELECT);
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123 | break;
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124 | default:
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125 | stats &= ~((1<<FSELECT) | (1<<PSELECT));
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126 | }
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127 | DDS_write(stats);
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128 | }
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129 |
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130 | //stellt den AD9833 auf die gewünschte Freqenz in Hz ein
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131 | //der Wert wird in das angegebene Register geschrieben (FREQ0, FREQ1)
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132 | void DDS_freq(uint32_t frequenz, uint8_t reg){
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133 | double temp = ((double)frequenz/(double)MCLK);
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134 | uint32_t regist = temp * konst;
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135 | tosend = regist & 16383;
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136 | if (reg == FREQ0){tosend |= (1<<14);}
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137 | if (reg == FREQ1){tosend |= (1<<15);}
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138 | DDS_write(tosend);
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139 | tosend = (regist & ~16383)>>14;
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140 | if (reg == FREQ0){tosend |= (1<<14);}
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141 | if (reg == FREQ1){tosend |= (1<<15);}
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142 | DDS_write(tosend);
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143 | }
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144 |
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145 | //stellt den AD9833 auf die gewünschte Phase ein
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146 | //der Wert wird in das angegebene Register geschrieben (PHASE0, PHASE1)
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147 | void DDS_phase(uint16_t phase, uint8_t reg){
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148 | uint16_t regist = (uint16_t) (phase*konst2)/pi2;
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149 | tosend = (1<<15) | (1<<14);
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150 | if (reg == PHASE1){tosend |= (1<<13);}
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151 | DDS_write(tosend | regist);
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152 | }
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153 |
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154 |
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155 |
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156 |
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157 |
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158 | int main()
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159 | {
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160 | DDRD |= (1 << 6);
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161 | PORTD |= (1 << 6); //hier gehen die SPI-Pins auf low
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162 | _delay_ms(200);
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163 | PORTD &= ~(1 << 6); //und hier wieder auf high
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164 |
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165 | DDS_init();
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166 |
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167 | DDS_signal(SINUS);
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168 |
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169 | DDS_phase(0, PHASE0);
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170 |
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171 | DDS_freq(1000, FREQ0);
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172 |
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173 |
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174 | PORTD |= (1 << 6);
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175 | _delay_ms(200);
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176 | PORTD &= ~(1 << 6);
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177 |
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178 | }
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