Subversion Repositories – MLAB

(root)/Modules/TDC/GP201A/SW/PICinterface/1wire.c

Rev 1767

#define ONE_WIRE_PIN       PIN_A1

void onewire_reset()



{
output_low(ONE_WIRE_PIN);
delay_us(500);
output_float(ONE_WIRE_PIN);
delay_us(500);
output_float(ONE_WIRE_PIN);
}


void onewire_write(int data)
{
int count;

for (count=0; count<8; ++count)
{
output_low(ONE_WIRE_PIN);
delay_us( 2 );
output_bit(ONE_WIRE_PIN, shift_right(&data,1,1));

   delay_us( 60 );
   output_float(ONE_WIRE_PIN);
   delay_us( 2 );
}
}


int onewire_read()
{
int count, data;

for (count=0; count<8; ++count)
{
output_low(ONE_WIRE_PIN);
delay_us( 2 );
output_float(ONE_WIRE_PIN);
delay_us( 8 );
shift_right(&data,1,input(ONE_WIRE_PIN));
     delay_us( 120 );
}

return( data );
}