Hallo Zusammen,
vielleicht habt ihr eine Idee, warum der ADC nur 1x wandelt und dann
immer dass selbe Ergebniss zurückgegeben wird.
Dabei habe ich folgenden Code
1 | #include <avr/io.h>
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2 |
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3 | //USES:
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4 | //VCCIO = ADC0
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5 | //AVCC = VCC
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6 | //AREF = 100NF
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7 | //V-ADC = (ADC-Value*VREF)/1024
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8 |
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9 | /*
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10 | ADMUX-Reg:
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11 | RESET-Value
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12 | 7654 3210
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13 | 0000 0000
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14 | |||| |||-MUX0
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15 | |||| ||--MUX1
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16 | |||| |---MUX2
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17 | |||| ----MUX3 --> USE ADC0
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18 | |||- ----NC
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19 | ||-- ----ADLAR --> Result is right Adjusted
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20 | |--- ----REFS0 --> External-refference
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21 | ---- ----REFS1
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22 |
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23 | USED-Value
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24 | 7654 3210
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25 | 0100 0000 = 0x40
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26 | |||| |||-MUX0
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27 | |||| ||--MUX1
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28 | |||| |---MUX2
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29 | |||| ----MUX3 --> USE ADC0
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30 | |||- ----NC
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31 | ||-- ----ADLAR --> Result is right Adjusted
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32 | |--- ----REFS0 --> Use AVCC with external CAP at AREF-Pin
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33 | ---- ----REFS1
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34 |
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35 | ADCSRA-REG:
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36 | RESET-Value
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37 | 7654 3210
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38 | 0000 0000
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39 | |||| |||-ADSP0
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40 | |||| ||--ADSP1
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41 | |||| |---ADSP2 --> ADC-CLK Division-factor = 2
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42 | |||| ----ADIE --> ADC-Interrupt is disabled
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43 | |||- ----ADIF --> Interrupt Flag, set by ADC if conversion = Completed
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44 | ||-- ----ADATE --> No Start with trigger-signal
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45 | |--- ----ADSC --> Conversion stopped
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46 | ---- ----ADEN --> ADC = Disabled
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47 |
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48 | USED-Value
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49 | 7654 3210
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50 | 1110 0111 = 0xE7
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51 | |||| |||-ADSP0
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52 | |||| ||--ADSP1
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53 | |||| |---ADSP2 --> ADC-CLK Division-factor = 128
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54 | |||| ----ADIE --> ADC-Interrupt is disabled
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55 | |||- ----ADIF --> Interrupt Flag, set by ADC if conversion = Completed
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56 | ||-- ----ADATE --> Continous conversion start
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57 | |--- ----ADSC --> Conversion START
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58 | ---- ----ADEN --> ADC = ENABLED
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59 |
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60 | ADCSRB-REG:
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61 | RESET-Value == USED-Value
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62 | 7654 3210
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63 | 0000 0000
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64 | |||| |||-ADTS0
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65 | |||| ||--ADTS1
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66 | |||| |---ADTS2 --> Free-Running Mode
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67 | |||| ----nc
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68 | |||- ----nc
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69 | ||-- ----nc
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70 | |--- ----ACME --> Only for Analog-Comparator
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71 | ---- ----nc
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72 |
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73 | DIDR0-REG:
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74 | RESET-Value
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75 | 7654 3210
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76 | 0000 0000
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77 | |||| |||-ADC0D --> Digital-Input-Buffer VCCINT = Enabled
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78 | |||| ||--ADC1D --> Digital-Input-Buffer V+ = Enabled
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79 | |||| |---ADC2D --> Digital-Input-Buffer VDD = Enabled
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80 | |||| ----ADC3D --> Digital-Input-Buffer VCCIO = Enabled
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81 | |||- ----ADC4D --> Digital-Input-Buffer SDA = Enabled
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82 | ||-- ----ADC5D --> Digital-Input-Buffer SCL = Enabled
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83 | |--- ----nc
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84 | ---- ----nc
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85 |
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86 | USED-Value
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87 | 7654 3210
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88 | 0000 1111 = 0x0f
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89 | |||| |||-ADC0D --> Digital-Input-Buffer VCCINT = Disabled
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90 | |||| ||--ADC1D --> Digital-Input-Buffer V+ = Disabled
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91 | |||| |---ADC2D --> Digital-Input-Buffer VDD = Disabled
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92 | |||| ----ADC3D --> Digital-Input-Buffer VCCIO = Disabled
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93 | |||- ----ADC4D --> Digital-Input-Buffer SDA = Enabled
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94 | ||-- ----ADC5D --> Digital-Input-Buffer SCL = Enabled
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95 | |--- ----nc
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96 | ---- ----nc
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97 |
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98 | */
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99 |
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100 | void INIT_ADC()
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101 | {
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102 | DIDR0 = 0x0F;
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103 | ADMUX = 0x40;
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104 | ADCSRB = 0x00; // = Reset-Value
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105 | ADCSRA = 0xE7; // Start continous conv
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106 | }
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107 |
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108 | uint16_t GET_VIO()
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109 | {
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110 | uint16_t u_adc = 0x0000;
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111 | u_adc = ADCH;
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112 | u_adc = (u_adc << 8);
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113 | u_adc |= ADCL;
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114 | //result = 10Bit
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115 | return u_adc;
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116 | }
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Es scheint als wäre er im Free-Running Mode, jedoch liefert er nur
einmal ein (Korrektes) Ergebniss, dann jedoch niemals mehr ein neues.
Free-Running bedeutet schon dass er durchgehend wandlet, oder?
Schöne Grüße, ware echt Prima wenn mich jemand auf die Spur bringen
könnte.
Grüße, Matthias
