1 | #include <stdio.h>
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2 | #include <avr\io.h>
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3 | #define F_CPU 32000000UL
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4 | #include <util\delay.h>
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5 | #include <math.h>
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6 |
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7 | #define VERSION "0.0.1"
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8 |
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9 |
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10 | void SetWaveFreq(unsigned long int freq);
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11 | void SetWaveCount(char count);
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12 | void LoadSineWave(int len);
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13 |
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14 | void Config32MHzClock(void);
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15 |
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16 |
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17 |
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18 |
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19 | void DoSineWave(unsigned int freq);
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20 |
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21 |
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22 |
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23 | volatile int data12[100];
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24 | volatile int gWaveNumSamp=50;
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25 | volatile int gWaveCount=0;
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26 |
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27 |
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28 | int main(void)
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29 | {
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30 | int Reading, index;
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31 | char data;
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32 | char buffer[100];
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33 |
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34 |
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35 | Config32MHzClock();
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36 |
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37 | CLK.PSCTRL = 0x00; // no division on peripheral clock
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38 |
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39 | PORTCFG.CLKEVOUT = PORTCFG_CLKOUT_PE7_gc;
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40 | PORTE.DIR = (1<<7); // clkout
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41 | TCC0.CTRLA = 4;
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42 |
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43 | // setup DAC output on PORTB:1 as GND reference
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44 | PORTB.DIR |= 0x02;
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45 | PORTB.OUT &= 0xFD;
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46 |
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47 |
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48 |
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49 |
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50 | LoadSineWave(gWaveNumSamp);
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51 |
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52 |
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53 |
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54 | while(1)
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55 | {
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56 |
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57 | };
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58 |
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59 | }
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60 |
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61 |
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62 | void DoDAC(unsigned int ch, unsigned int value, unsigned int ref)
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63 | {
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64 | if(ref<4)
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65 | DACB.CTRLC = (ref << 3); // select reference
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66 | else return; // early return for bad parameter
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67 |
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68 | DACB.CTRLB = DAC_CHSEL_DUAL_gc; // select dual output DAC
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69 | if(ch==0)
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70 | {
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71 | DACB.CTRLA = (1<<2) | (1<<0); // enable DACB, CH0
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72 | DACB.CH0DATA = value;
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73 | }
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74 | if(ch==1)
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75 | {
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76 | DACB.CTRLA |= (1<<3) | (1<<0); // enable DACB, CH1
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77 | DACB.CH1DATA = value;
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78 | };
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79 |
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80 | };
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81 |
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82 | void DoSineWave(unsigned int freq)
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83 | {
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84 | gWaveNumSamp=50;
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85 |
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86 | LoadSineWave(gWaveNumSamp);
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87 |
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88 | SetWaveFreq(freq);
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89 | };
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90 |
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91 |
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92 |
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93 |
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94 | void DoNCycles(char num)
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95 | {
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96 | SetWaveCount(num);
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97 | };
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98 |
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99 | void DoOutputOff()
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100 | {
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101 | DMA.CTRL = 0x00; // stop dma
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102 | DoDAC(0,0,1); // drive DAC to 0
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103 | };
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104 |
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105 |
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106 |
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107 | void LoadSineWave(int len)
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108 | {
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109 | int i;
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110 |
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111 | for(i=0;i<len;i++)
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112 | {
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113 | data12[i]=((sin((2.0/(float)len)*(float)i*M_PI)*0.5 + 0.5)*4095);
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114 | };
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115 |
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116 | };
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117 |
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118 |
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119 |
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120 |
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121 |
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122 | void SetWaveFreq(unsigned long int freq)
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123 | {
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124 | if(freq > 10000)
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125 | {
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126 | TCD0.CTRLA = 0x1;
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127 | TCD0.PER = (int) ((F_CPU/freq/gWaveNumSamp));
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128 | }
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129 | else
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130 | {
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131 | TCD0.CTRLA = 0x2;
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132 | TCD0.PER = (int) ((F_CPU/freq/gWaveNumSamp)/2.0);
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133 |
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134 | };
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135 | };
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136 |
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137 | void SetWaveCount(char count)
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138 | {
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139 | gWaveCount = count; // if count = 0 then repeat count is infinite
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140 | };
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141 |
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142 |
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143 |
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144 |
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145 | void Config32MHzClock(void)
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146 | {
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147 | CCP = CCP_IOREG_gc; //Security Signature to modify clock
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148 | // initialize clock source to be 32MHz internal oscillator (no PLL)
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149 | OSC.CTRL = OSC_RC32MEN_bm; // enable internal 32MHz oscillator
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150 | while(!(OSC.STATUS & OSC_RC32MRDY_bm)); // wait for oscillator ready
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151 | CCP = CCP_IOREG_gc; //Security Signature to modify clock
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152 | CLK.CTRL = 0x01; //select sysclock 32MHz osc
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153 |
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154 | };
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