1 | #include <avr/io.h>
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2 | #include <util/delay.h>
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3 |
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4 | //Anschlussdefinition des SHT11
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5 | #define SHT_SCK_DDR DDRB
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6 | #define SHT_DATA_DDR DDRB
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7 |
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8 | #define SHT_SCK_PORT PORTB
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9 | #define SHT_DATA_PORT PORTB
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10 |
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11 | #define SHT_DATA_PIN_IN PINB
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12 |
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13 | #define SHT_SCK_PIN PB0
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14 | #define SHT_DATA_PIN PB1
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15 |
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16 | //Einpegelzeit zwischen einem Flankenwechsel in ms
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17 | #define EINPEGELN 1
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18 |
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19 |
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20 | uint16_t TEMP = 0; //Temp. Variable
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21 |
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22 | //Prototypen
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23 | int Start_Temp_Messung (void);
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24 | int TransmissionStart(void);
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25 | int Adresse(void);
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26 | int Temperaturmessung(void);
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27 | int Tempaufnahme(void);
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28 | int Taktimpuls(void);
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29 | int Temp_umrechnung(void);
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30 |
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31 | ////////////////////////////////////////////////////////////////////////////////////////
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32 | int main(void)
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33 | {
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34 | Start_Temp_Messung();
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35 |
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36 | //Testschleife für Breakpoint
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37 | while(1)
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38 | {
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39 | _delay_ms(1000);
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40 | }
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41 | }
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42 | ////////////////////////////////////////////////////////////////////////////////////////
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43 |
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44 | ////////////////////////////////////////////////////////////////////////////////////////
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45 | int Start_Temp_Messung(void)
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46 | {
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47 | _delay_ms(20); //Warte 20ms bis SHT in Sleep-Mode
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48 | TransmissionStart(); //TransmissionStart- Sequenz
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49 | Adresse(); //Adress- Sequenz (000)
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50 | Temperaturmessung(); //Befehl -> Temperaturmessung (00011)
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51 | Tempaufnahme(); //Empfangen des 14Bit Temp. Messwertes
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52 | Temp_umrechnung(); //Umrechnung 16Bit Wert zu Temp.
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53 |
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54 | return(0);
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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 | int TransmissionStart(void)
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60 | {
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61 | ////////////Connection Reset Sequenz/////////////////
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62 | SHT_DATA_DDR = SHT_DATA_DDR | (1<<SHT_DATA_PIN); //Datenpin als Ausgang setzen
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63 | SHT_SCK_DDR = SHT_SCK_DDR | (1<<SHT_SCK_PIN); //Taktpin als Ausgang setzen
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64 | SHT_DATA_PORT = SHT_DATA_PORT | (1<<SHT_DATA_PIN); //Datenpin auf HIGH setzen
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65 | Taktimpuls(); //Taktsignal -> H -> L
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66 | Taktimpuls(); //Taktsignal -> H -> L
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67 | Taktimpuls(); //Taktsignal -> H -> L
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68 | Taktimpuls(); //Taktsignal -> H -> L
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69 | Taktimpuls(); //Taktsignal -> H -> L
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70 | Taktimpuls(); //Taktsignal -> H -> L
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71 | Taktimpuls(); //Taktsignal -> H -> L
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72 | Taktimpuls(); //Taktsignal -> H -> L
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73 | Taktimpuls(); //Taktsignal -> H -> L
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74 | Taktimpuls(); //Taktsignal -> H -> L
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75 | Taktimpuls(); //Taktsignal -> H -> L
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76 | ////////////Connection Reset Sequenz/////////////////
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77 |
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78 | //SHT_DATA_DDR = SHT_DATA_DDR | (1<<SHT_DATA_PIN); //Datenpin als Ausgang setzen
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79 | //SHT_SCK_DDR = SHT_SCK_DDR | (1<<SHT_SCK_PIN); //Taktpin als Ausgang setzen
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80 |
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81 | //Transmission Start Sequenz
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82 | _delay_ms(EINPEGELN);
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83 |
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84 | SHT_DATA_PORT = SHT_DATA_PORT | (1<<SHT_DATA_PIN); //Datenpin auf HIGH setzen
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85 | SHT_SCK_PORT = SHT_SCK_PORT & ~(1<<SHT_SCK_PIN); //Taktpin auf Low setzen
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86 |
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87 | _delay_ms(EINPEGELN);
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88 |
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89 | SHT_SCK_PORT = SHT_SCK_PORT | (1<<SHT_SCK_PIN); //Taktpin auf HIGH setzen
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90 |
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91 | _delay_ms(EINPEGELN);
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92 |
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93 | SHT_DATA_PORT = SHT_DATA_PORT & ~(1<<SHT_DATA_PIN); //Datenpin auf LOW setzen
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94 |
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95 | _delay_ms(EINPEGELN);
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96 |
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97 | SHT_SCK_PORT = SHT_SCK_PORT & ~(1<<SHT_SCK_PIN); //Taktpin auf Low setzen
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98 |
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99 | _delay_ms(EINPEGELN);
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100 |
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101 | SHT_SCK_PORT = SHT_SCK_PORT | (1<<SHT_SCK_PIN); //Taktpin auf HIGH setzen
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102 |
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103 | _delay_ms(EINPEGELN);
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104 |
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105 | SHT_DATA_PORT = SHT_DATA_PORT | (1<<SHT_DATA_PIN); //Datenpin auf HIGH setzen
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106 |
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107 | _delay_ms(EINPEGELN);
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108 |
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109 | SHT_SCK_PORT = SHT_SCK_PORT & ~(1<<SHT_SCK_PIN); //Taktpin auf Low setzen
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110 |
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111 | _delay_ms(EINPEGELN);
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112 |
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113 | return(0);
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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 | int Adresse(void)
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119 | {
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120 | SHT_DATA_DDR = SHT_DATA_DDR | (1<<SHT_DATA_PIN); //Datenpin als Ausgang setzen
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121 | SHT_SCK_DDR = SHT_SCK_DDR | (1<<SHT_SCK_PIN); //Taktpin als Ausgang setzen
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122 |
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123 | //Übermitteln der Adresse (000)
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124 | _delay_ms(EINPEGELN);
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125 |
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126 | SHT_DATA_PORT = SHT_DATA_PORT & ~(1<<SHT_DATA_PIN); //Datenpin auf LOW setzen
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127 |
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128 | Taktimpuls(); //Taktsignal -> H -> L
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129 |
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130 | Taktimpuls(); //Taktsignal -> H -> L
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131 |
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132 | Taktimpuls(); //Taktsignal -> H -> L
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133 | return(0);
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134 | }
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135 | ////////////////////////////////////////////////////////////////////////////////////////
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136 |
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137 | ////////////////////////////////////////////////////////////////////////////////////////
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138 | int Temperaturmessung(void)
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139 | {
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140 | //Übermitteln des Komandos
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141 | Taktimpuls(); //Taktsignal -> H -> L
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142 |
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143 | Taktimpuls(); //Taktsignal -> H -> L
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144 |
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145 | Taktimpuls(); //Taktsignal -> H -> L
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146 |
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147 | SHT_DATA_PORT = SHT_DATA_PORT | (1<<SHT_DATA_PIN); //Datenpin auf HIGH setzen
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148 |
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149 | Taktimpuls(); //Taktsignal -> H -> L
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150 |
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151 | Taktimpuls(); //Taktsignal -> H -> L
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152 |
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153 | _delay_ms(EINPEGELN);
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154 | SHT_DATA_DDR = SHT_DATA_DDR & ~(1<<SHT_DATA_PIN); //Datenpin als Eingang setzen
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155 | SHT_DATA_PORT = SHT_DATA_PORT & ~(1<<SHT_DATA_PIN); //Datenpin auf LOW setzen (PullUP OFF)
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156 |
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157 | Taktimpuls(); //Taktsignal -> H -> L (ACK)
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158 |
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159 | _delay_ms(450); //Warte auf Messergebniss
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160 | //Warteschleife + Watchdog
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161 |
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162 | return(0);
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163 | }
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164 | ////////////////////////////////////////////////////////////////////////////////////////
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165 |
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166 | ////////////////////////////////////////////////////////////////////////////////////////
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167 | int Tempaufnahme(void)
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168 | {
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169 | TEMP = 0;
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170 |
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171 | //Auslesen MSB
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172 | Taktimpuls(); //Taktsignal -> H -> L
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173 |
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174 | if (SHT_DATA_PIN_IN & (1<<SHT_DATA_PIN)) //Wenn Datenpin = 1 dann:
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175 | {
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176 | TEMP = TEMP | (1<<15); //Schreibe 1 in Bit 16 von MSB
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177 | }
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178 |
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179 | Taktimpuls(); //Taktsignal -> H -> L
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180 |
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181 | if (SHT_DATA_PIN_IN & (1<<SHT_DATA_PIN)) //Wenn Datenpin = 1 dann:
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182 | {
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183 | TEMP = TEMP | (1<<14); //Schreibe 1 in Bit 15 von MSB
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184 | }
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185 |
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186 | Taktimpuls(); //Taktsignal -> H -> L
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187 |
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188 | if (SHT_DATA_PIN_IN & (1<<SHT_DATA_PIN)) //Wenn Datenpin = 1 dann:
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189 | {
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190 | TEMP = TEMP | (1<<13); //Schreibe 1 in Bit 14 von MSB
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191 | }
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192 |
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193 | Taktimpuls(); //Taktsignal -> H -> L
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194 |
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195 | if (SHT_DATA_PIN_IN & (1<<SHT_DATA_PIN)) //Wenn Datenpin = 1 dann:
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196 | {
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197 | TEMP = TEMP | (1<<12); //Schreibe 1 in Bit 13 von MSB
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198 | }
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199 |
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200 | Taktimpuls(); //Taktsignal -> H -> L
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201 |
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202 | if (SHT_DATA_PIN_IN & (1<<SHT_DATA_PIN)) //Wenn Datenpin = 1 dann:
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203 | {
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204 | TEMP = TEMP | (1<<11); //Schreibe 1 in Bit 12 von MSB
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205 | }
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206 |
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207 | Taktimpuls(); //Taktsignal -> H -> L
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208 |
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209 | if (SHT_DATA_PIN_IN & (1<<SHT_DATA_PIN)) //Wenn Datenpin = 1 dann:
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210 | {
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211 | TEMP = TEMP | (1<<10); //Schreibe 1 in Bit 11 von MSB
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212 | }
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213 |
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214 | Taktimpuls(); //Taktsignal -> H -> L
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215 |
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216 | if (SHT_DATA_PIN_IN & (1<<SHT_DATA_PIN)) //Wenn Datenpin = 1 dann:
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217 | {
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218 | TEMP = TEMP | (1<<9); //Schreibe 1 in Bit 10 von MSB
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219 | }
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220 |
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221 | Taktimpuls(); //Taktsignal -> H -> L
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222 |
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223 | if (SHT_DATA_PIN_IN & (1<<SHT_DATA_PIN)) //Wenn Datenpin = 1 dann:
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224 | {
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225 | TEMP = TEMP | (1<<8); //Schreibe 1 in Bit 9 von MSB
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226 | }
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227 |
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228 | _delay_ms(EINPEGELN);
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229 |
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230 | //ACK zwischen den beiden 8- Bit- Feldern
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231 | SHT_DATA_DDR = SHT_DATA_DDR | (1<<SHT_DATA_PIN); //Datenpin als Ausgang setzen (ACK)
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232 |
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233 | _delay_ms(EINPEGELN);
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234 |
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235 | SHT_DATA_PORT = SHT_DATA_PORT & ~(1<<SHT_DATA_PIN); //Datenpin auf LOW setzen
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236 |
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237 | _delay_ms(EINPEGELN);
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238 |
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239 | Taktimpuls(); //Taktsignal -> H -> L
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240 |
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241 | SHT_DATA_DDR = SHT_DATA_DDR & ~(1<<SHT_DATA_PIN); //Datenpin als Eingang setzen
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242 |
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243 | _delay_ms(EINPEGELN);
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244 |
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245 | //Auslesen LSB
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246 | Taktimpuls(); //Taktsignal -> H -> L
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247 |
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248 | if (SHT_DATA_PIN_IN & (1<<SHT_DATA_PIN)) //Wenn Datenpin = 1 dann:
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249 | {
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250 | TEMP = TEMP | (1<<7); //Schreibe 1 in Bit 8 von MSB
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251 | }
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252 |
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253 | Taktimpuls(); //Taktsignal -> H -> L
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254 |
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255 | if (SHT_DATA_PIN_IN & (1<<SHT_DATA_PIN)) //Wenn Datenpin = 1 dann:
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256 | {
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257 | TEMP = TEMP | (1<<6); //Schreibe 1 in Bit 7 von MSB
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258 | }
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259 |
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260 | Taktimpuls(); //Taktsignal -> H -> L
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261 |
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262 | if (SHT_DATA_PIN_IN & (1<<SHT_DATA_PIN)) //Wenn Datenpin = 1 dann:
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263 | {
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264 | TEMP = TEMP | (1<<5); //Schreibe 1 in Bit 6 von MSB
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265 | }
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266 |
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267 | Taktimpuls(); //Taktsignal -> H -> L
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268 |
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269 | if (SHT_DATA_PIN_IN & (1<<SHT_DATA_PIN)) //Wenn Datenpin = 1 dann:
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270 | {
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271 | TEMP = TEMP | (1<<4); //Schreibe 1 in Bit 5 von MSB
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272 | }
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273 |
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274 | Taktimpuls(); //Taktsignal -> H -> L
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275 |
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276 | if (SHT_DATA_PIN_IN & (1<<SHT_DATA_PIN)) //Wenn Datenpin = 1 dann:
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277 | {
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278 | TEMP = TEMP | (1<<3); //Schreibe 1 in Bit 4 von MSB
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279 | }
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280 |
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281 | Taktimpuls(); //Taktsignal -> H -> L
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282 |
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283 | if (SHT_DATA_PIN_IN & (1<<SHT_DATA_PIN)) //Wenn Datenpin = 1 dann:
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284 | {
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285 | TEMP = TEMP | (1<<2); //Schreibe 1 in Bit 3 von MSB
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286 | }
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287 |
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288 | Taktimpuls(); //Taktsignal -> H -> L
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289 |
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290 | if (SHT_DATA_PIN_IN & (1<<SHT_DATA_PIN)) //Wenn Datenpin = 1 dann:
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291 | {
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292 | TEMP = TEMP | (1<<1); //Schreibe 1 in Bit 2 von MSB
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293 | }
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294 |
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295 | Taktimpuls(); //Taktsignal -> H -> L
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296 |
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297 | if (SHT_DATA_PIN_IN & (1<<SHT_DATA_PIN)) //Wenn Datenpin = 1 dann:
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298 | {
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299 | TEMP = TEMP | (1<<0); //Schreibe 1 in Bit 1 von MSB
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300 | }
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301 |
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302 | _delay_ms(EINPEGELN);
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303 |
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304 | SHT_DATA_DDR = SHT_DATA_DDR | (1<<SHT_DATA_PIN); //Datenpin als Ausgang setzen (ACK)
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305 |
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306 | _delay_ms(EINPEGELN);
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307 |
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308 | SHT_DATA_PORT = SHT_DATA_PORT | (1<<SHT_DATA_PIN); //Datenpin auf HIGH setzen (NO CRC)
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309 |
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310 | Taktimpuls(); //Taktsignal -> H -> L
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311 |
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312 | return(0);
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313 | }
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314 | ////////////////////////////////////////////////////////////////////////////////////////
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315 |
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316 | int Taktimpuls(void)
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317 | {
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318 | _delay_ms(EINPEGELN);
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319 |
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320 | SHT_SCK_PORT = SHT_SCK_PORT | (1<<SHT_SCK_PIN); //Taktpin auf HIGH setzen
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321 |
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322 | _delay_ms(EINPEGELN);
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323 |
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324 | SHT_SCK_PORT = SHT_SCK_PORT & ~(1<<SHT_SCK_PIN); //Taktpin auf Low setzen
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325 |
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326 | _delay_ms(EINPEGELN);
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327 |
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328 | return(0);
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329 | }
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330 |
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331 | int Temp_umrechnung(void)
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332 | {
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333 | TEMP = TEMP * 0.01;
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334 | TEMP = TEMP - 40;
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335 | return(0);
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336 | }
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