1wirecount.bas

82 sample programs written in BASCOM-8051 for 8051 developement

'------------------------------------------------------------------------------
'                       1wirecount.bas
'                   (c) 2002 MCS Electronics
' demonstration of using multiple devices
'------------------------------------------------------------------------------
'chip we use
$regfile = "89s8252.dat"
'crystal attached
$crystal = 12000000

'baud rate
$baud = 4800

'wait for 500 mili secs
Waitms 500

'the pins we use
'connect a 4K7 resistor from the data pin to VCC
Config 1wire = P1.0

'we need an array of 8 bytes to hold the result
Dim Ar(8) As Byte
'we also need a counter variable and a word variable
Dim I As Byte , W As Word

'some ids of 1wire chips I tested
' 01 51 B5 8D 01 00 00 56
' 01 84 B3 8D 01 00 00 E5

Print "start"
'get the number of connected 1wire device
W = 1wirecount(ar(1))
'print if there was an error and how many sensors are available
Print "ERR " ; Err ; " count " ; W

'now get the data from the first 1wire device on the bus

Ar(1) = 1wsearchfirst()
'print the ID
For I = 1 To 8
  Printhex Ar(i);
Next
Print

'I assume that there are more than 1 1wire devices
Do
  'get the next device
  Ar(1) = 1wsearchnext()
  For I = 1 To 8
    Printhex Ar(i);
  Next
  Print
Loop Until Err = 1
'when ERR is 1 it means there are no more devices
' IMPORTANT : 1wsearchfirst and next functions do require that you use the SAME array
'In this example this is ar(1)

'once you know the ID, you can address a specific device

End