Mikroelektronika MIKROE-742 데이터 시트

296

- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 6

function Ow_Reset(): word;

- 

0

if the device is present 

- 

1

if the device is not present 

Issues OneWire reset signal for DS18x20.

Parameters : 

- None. 

Devices compliant with the Dallas OneWire protocol.

Global variables : 

- 

OW_Bit_Read

: OneWire read line 

- 

OW_Bit_Write

: OneWire write line. 

- 

OW_Bit_Direction

: Direction of the OneWire pin 

must be defined before using this function.

// OneWire pinout
var OW_Bit_Read : sbit at PINB.B2;     
var OW_Bit_Write : sbit at PORTB.B2;   
var OW_Bit_Direction : sbit at DDRB.B2;
// end of OneWire pinout

// Issue Reset signal on One-Wire Bus
Ow_Reset();