Sensor wird nicht erkannt

[franzl]

ich möche den m32 mit dem 1wire DS18S20 betreiben und mit Bascom 1.11.7.7 (Demo) programmieren.
Der Fühler hängt mit Pin 1 an GND und Pin 3 an +5V

Displayansteuerung klappt wunderbar.
Nur der 1wire Fühler funktioniert nicht

Der Fühler(Pin 2) hängt an PortD.2 und ist über einen 4,7k an +5V.

$crystal = 8000000

Declare Sub Read1820
Declare Sub Crcit
Declare Sub Temperature
Dim Bd(9) As Byte
Dim I As Byte , Tmp As Byte
Dim Crc As Byte
Dim T As Integer , T1 As Integer
Dim V As Byte
Config Lcdpin = Pin , Db4 = Porta.2 , Db5 = Porta.3 , Db6 = Porta.4 , Db7 = Porta.5 , E = Porta.1 , Rs = Porta.0
Config Lcd = 16 * 4
Config 1wire = Pd.2
Cursor Off Noblink
Cls
Locate 1 , 1 : Lcd "Brutkasten"
Locate 2 , 1 : Lcd "T="
Do
   Temperature
   Waitms 250
Loop
End

'//////////////////////////////////////////////////////////////////////////////
Sub Temperature                                             ' actual measuring
   1wwrite &HCC : 1wwrite &H44                              ' start measure
   Waitms 300                                               ' wait for end of conversion
   Read1820                                                 ' read 9 bytes
   If Err = 1 Then                                          ' if there is no sensor
      Locate 2 , 4 : Lcd "--  "                             ' we put "-- " on LCD
   Else
      If Crc = 0 Then                                       ' sensor present, check CRC
         Locate 2 , 4 : Lcd T                               ' CRC OK, print T*10 on LCD
      Else
         Locate 2 , 4 : Lcd "**  "                          ' CRC NOT OK, "** " on LCD
      End If
   End If
End Sub
'//////////////////////////////////////////////////////////////////////////////
Sub Read1820                                                ' reads sensor ans calculate
                                                   ' T for 0.1 C
   1wreset                                                  ' reset the bus
   1wwrite &HCC                                             ' read internal RAM
   1wwrite &HBE                                             ' read 9 data bytest
   Bd(1) = 1wread(9)                                        ' read bytes in array
   1wreset                                                  ' reset the bus
   Crcit                                                    ' ckeck CRC
   If Crc = 0 Then                                          ' if is OK, calculate for
      Tmp = Bd(1) And 1                                     ' 0.1C precision
      If Tmp = 1 Then Decr Bd(1)
      T = Makeint(bd(1) , Bd(2))
      T = T * 50 : T = T - 25 : T1 = Bd(8) - Bd(7) : T1 = T1 * 100
      T1 = T1 / Bd(8) : T = T + T1 : T = T / 10
   End If
End Sub
'//////////////////////////////////////////////////////////////////////////////
Sub Crcit                                                   ' calculate 8 bit CRC
                                                   ' bigger but faster
   Crc = 0                                                  ' needs a 256 elements table
   For I = 1 To 9
      Tmp = Crc Xor Bd(i)
      Crc = Lookup(tmp , Crc8)
   Next
End Sub
'//////////////////////////////////////////////////////////////////////////////
Crc8:
Data 0 , 94 , 188 , 226 , 97 , 63 , 221 , 131 , 194 , 156
Data 126 , 32 , 163 , 253 , 31 , 65 , 157 , 195 , 33 , 127
Data 252 , 162 , 64 , 30 , 95 , 1 , 227 , 189 , 62 , 96
Data 130 , 220 , 35 , 125 , 159 , 193 , 66 , 28 , 254 , 160
Data 225 , 191 , 93 , 3 , 128 , 222 , 60 , 98 , 190 , 224
Data 2 , 92 , 223 , 129 , 99 , 61 , 124 , 34 , 192 , 158
Data 29 , 67 , 161 , 255 , 70 , 24 , 250 , 164 , 39 , 121
Data 155 , 197 , 132 , 218 , 56 , 102 , 229 , 187 , 89 , 7
Data 219 , 133 , 103 , 57 , 186 , 228 , 6 , 88 , 25 , 71
Data 165 , 251 , 120 , 38 , 196 , 154 , 101 , 59 , 217 , 135
Data 4 , 90 , 184 , 230 , 167 , 249 , 27 , 69 , 198 , 152
Data 122 , 36 , 248 , 166 , 68 , 26 , 153 , 199 , 37 , 123
Data 58 , 100 , 134 , 216 , 91 , 5 , 231 , 185 , 140 , 210
Data 48 , 110 , 237 , 179 , 81 , 15 , 78 , 16 , 242 , 172
Data 47 , 113 , 147 , 205 , 17 , 79 , 173 , 243 , 112 , 46
Data 204 , 146 , 211 , 141 , 111 , 49 , 178 , 236 , 14 , 80
Data 175 , 241 , 19 , 77 , 206 , 144 , 114 , 44 , 109 , 51
Data 209 , 143 , 12 , 82 , 176 , 238 , 50 , 108 , 142 , 208
Data 83 , 13 , 239 , 177 , 240 , 174 , 76 , 18 , 145 , 207
Data 45 , 115 , 202 , 148 , 118 , 40 , 171 , 245 , 23 , 73
Data 8 , 86 , 180 , 234 , 105 , 55 , 213 , 139 , 87 , 9
Data 235 , 181 , 54 , 104 , 138 , 212 , 149 , 203 , 41 , 119
Data 244 , 170 , 72 , 22 , 233 , 183 , 85 , 11 , 136 , 214
Data 52 , 106 , 43 , 117 , 151 , 201 , 74 , 20 , 246 , 168
Data 116 , 42 , 200 , 150 , 21 , 75 , 169 , 247 , 182 , 232
Data 10 , 84 , 215 , 137 , 107 , 53

habt ihr vielleicht eine ahnung warum der Sensor nicht erkannt wird.
denn am Display erscheint nur -- anstatt der Temperatur.
Danke für eure hilfe

[albundy]

Hallo franzl,

Sub Read1820                                                ' reads sensor ans calculate 
                                                   ' T for 0.1 C 
   1wreset                                                  ' reset the bus 
   1wwrite &HCC                                             ' read internal RAM 
   1wwrite &HBE                                             ' read 9 data bytest 
   Bd(1) = 1wread(9)                                        ' read bytes in array 
   1wreset                                                  ' reset the bus

Es steht ja schon im Code "read bytes in array", dann solltest du es auch machen.

Sub Read1820                                                ' reads sensor ans calculate 
                                                   ' T for 0.1 C 
   1wreset                                                  ' reset the bus 
   1wwrite &HCC                                             ' read internal RAM 
   1wwrite &HBE                                             ' read 9 data bytest 
   For I = 1 to 9
   Bd(I) = 1wread()                                        ' read bytes in array 
   Next
   1wreset                                                  ' reset the bus

Bd(1) = Temperatur LSB
Bd(2) = ---"--- MSB

Wenn es auf 0,1 Grad genau sein soll brauchst du auch noch
Bd(7) = Count Remain
Bd( 8 ) = Count per Grad

Berechnung siehe Datenblatt