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OneWire Communication Library with Search functionality

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Author: Anton Rieckert

Last Updated: 2012-04-13

Package Version: 1.0.0.0

Category: Communication

Downloaded: 1287 times

Followed by: 1 user

License: MIT license  

This is a library written for the mikroPascal compilers to interface to these devices on a single bus. The library also includes functions that allows the master device to discover the number of slave devices on the bus and read there serial numbers.

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OneWire Communication Library

Example

//==============================================================================
begin
  // Init the CPU
  ADPCFG := 0xFFFF;                    // Configure AN pins as digital I/O

  // Init UART1 module for debug output
  UART1_Init(9600);

  // Init the one wire library
  oneWire_Init(PortD, 10);

  // Do a search for the one wire devices
  oneWireCount := oneWire_Search(@oneWireDevices, MAXDEVICE);
  
  if (oneWireCount = 0) then
  begin
    UART1_Write_Text('No OneWire devices found');
    while true do;
  end;

  // Now all the addresses of the one wire devices will be in the
  // oneWireDevices array and oneWireCount will have the number of
  // devices on the bus
  
  // Send the temperature on all of the devices to the UART port
  while (TRUE) do
  begin
    // Start convertion on all of the devices
    oneWire_Reset();                     // Onewire reset signal
    oneWire_WriteByte(0xCC);             // Issue command SKIP_ROM
    oneWire_WriteByte(0x44);             // Issue command CONVERT_T
    Delay_ms(750);                       // Wait for conversion

    // Loop trough all of the devices
    for i := 0 to oneWireCount - 1 do
    begin
      // Read device i's temperature
      temp := DS1820_ReadTemperature(oneWireDevices[i]);
      // Show the temp on the LCD
      Display_Temperature(temp);
    end;
  end;
end.

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