Exemplo n.º 1
0
/*
 * Reads temp from the DS18B20
 */
double ds1820_read(void)
{
    ADCSRA &= ~(1<<ADEN)|~(1<<ADSC);
    uint8_t busy=0, temp1, temp2;
    int16_t temp3;
    double result;

    ow_reset();
    ow_byte_wr(0xCC);
    ow_byte_wr(0x44);

    while(busy == 0) {
        busy = ow_byte_rd();
    }

    ow_reset();
    ow_byte_wr(0xCC);
    ow_byte_wr(0xBE);

    temp1 = ow_byte_rd();
    temp2 = ow_byte_rd();


    /*onewire_write(0xCC);            //Skip ROM, address all devices
    onewire_write(0x44);            //Start temperature conversion

    while(busy == 0)                //Wait while busy (bus is low)
        busy = onewire_read();

    onewire_reset();
    onewire_write(0xCC);            //Skip ROM, address all devices
    onewire_write(0xBE);            //Read scratchpad
    temp1 = onewire_read();
    temp2 = onewire_read();*/

    temp3 = temp2;
    temp3 = temp3 << 8;
    temp3 = temp3 | temp1;

    //result = (float) temp3 / 2.0;   //Calculation for DS18S20 with 0.5 deg C resolution
    result = (double) temp3 / 16.0;    //Calculation for DS18B20

    //_delay_ms(200);
    return(result);
}
Exemplo n.º 2
0
/* reads temperature (scratchpad) of sensor with rom-code id
   output: subzero==1 if temp.<0, cel: full celsius, mcel: frac
   in millicelsius*0.1
   i.e.: subzero=1, cel=18, millicel=5000 = -18,5000°C */
uint8_t DS18X20_read_meas(uint8_t *id, uint8_t *subzero, uint8_t *cel, uint8_t *cel_frac_bits)
{
	uint8_t i;
	uint8_t sp[DS18X20_SP_SIZE];

	ow_reset(); //**
	ow_command(DS18X20_READ, id);
	for ( i=0 ; i< DS18X20_SP_SIZE; i++ ) sp[i]=ow_byte_rd();
	if ( crc8( &sp[0], DS18X20_SP_SIZE ) )
		return DS18X20_ERROR_CRC;
	DS18X20_meas_to_cel(id[0], sp, subzero, cel, cel_frac_bits);
	return DS18X20_OK;
}
Exemplo n.º 3
0
/* reads temperature (scratchpad) of a single sensor (uses skip-rom)
   output: subzero==1 if temp.<0, cel: full celsius, mcel: frac
   in millicelsius*0.1
   i.e.: subzero=1, cel=18, millicel=5000 = -18,5000�C */
uint8_t DS18X20_read_meas_single(uint8_t familycode, uint8_t *subzero,
                                 uint8_t *cel, uint8_t *cel_frac_bits, uint16_t *maalt)
{
	uint8_t i;
	uint8_t sp[DS18X20_SP_SIZE];

	ow_command(DS18X20_READ, NULL);
	for (i = 0 ; i < DS18X20_SP_SIZE; i++) sp[i] = ow_byte_rd();
	if (crc8(&sp[0], DS18X20_SP_SIZE))
		return DS18X20_ERROR_CRC;
	DS18X20_meas_to_cel(familycode, sp, subzero, cel, cel_frac_bits, maalt);
	return DS18X20_OK;
}
Exemplo n.º 4
0
uint8_t DS18X20_read_scratchpad( uint8_t id[], uint8_t sp[] )
{
	uint8_t i;

	ow_reset(); //**
	if( ow_input_pin_state() ) { // only send if bus is "idle" = high
		ow_command( DS18X20_READ, id );
		for ( i=0 ; i< DS18X20_SP_SIZE; i++ )	sp[i]=ow_byte_rd();
		return DS18X20_OK;
	}
	else {

		return DS18X20_ERROR;
	}
}
Exemplo n.º 5
0
uint8_t DS18X20_read_scratchpad(uint8_t id[], uint8_t sp[])
{
	uint8_t i;

	ow_reset(); //**
	if (ow_input_pin_state()) {  // only send if bus is "idle" = high
		ow_command(DS18X20_READ, id);
		for (i = 0 ; i < DS18X20_SP_SIZE; i++)	sp[i] = ow_byte_rd();
		return DS18X20_OK;
	} else {
#ifdef DS18X20_VERBOSE
		printf_P(PSTR("DS18X20_read_scratchpad: Short Circuit !\r"));
#endif
		return DS18X20_ERROR;
	}
}
Exemplo n.º 6
0
/* verbose output rom-search follows read-scratchpad in one loop */
uint8_t DS18X20_read_meas_all_verbose( void )
{
	uint8_t id[OW_ROMCODE_SIZE], sp[DS18X20_SP_SIZE], diff;
	uint8_t i;
	uint16_t meas;
	int16_t decicelsius;
	char s[10];
	uint8_t subzero, cel, cel_frac_bits;

	for( diff = OW_SEARCH_FIRST; diff != OW_LAST_DEVICE; )
	{
		diff = ow_rom_search( diff, &id[0] );

		if( diff == OW_PRESENCE_ERR ) {
			uart_puts_P( "No Sensor found\r" );
			return OW_PRESENCE_ERR; // <--- early exit!
		}

		if( diff == OW_DATA_ERR ) {
			uart_puts_P( "Bus Error\r" );
			return OW_DATA_ERR;     // <--- early exit!
		}

		DS18X20_show_id_uart( id, OW_ROMCODE_SIZE );

		if( id[0] == DS18B20_FAMILY_CODE || id[0] == DS18S20_FAMILY_CODE ||
		    id[0] == DS1822_FAMILY_CODE ) {
			// temperature sensor

			uart_putc ('\r');

			ow_byte_wr( DS18X20_READ );           // read command

			for ( i=0 ; i< DS18X20_SP_SIZE; i++ ) {
				sp[i]=ow_byte_rd();
			}

			show_sp_uart( sp, DS18X20_SP_SIZE );

			if ( crc8( &sp[0], DS18X20_SP_SIZE ) ) {
				uart_puts_P( " CRC FAIL " );
			} else {
				uart_puts_P( " CRC O.K. " );
			}
			uart_putc ('\r');

			meas = sp[0]; // LSB Temp. from Scrachpad-Data
			meas |= (uint16_t) (sp[1] << 8); // MSB

			uart_puts_P( " T_raw=");
			uart_puthex_byte( (uint8_t)(meas >> 8) );
			uart_puthex_byte( (uint8_t)meas );
			uart_puts_P( " " );

			if( id[0] == DS18S20_FAMILY_CODE ) { // 18S20
				uart_puts_P( "S20/09" );
			}
			else if ( id[0] == DS18B20_FAMILY_CODE ||
			          id[0] == DS1822_FAMILY_CODE ) { // 18B20 or 1822
				i=sp[DS18B20_CONF_REG];
				if ( (i & DS18B20_12_BIT) == DS18B20_12_BIT ) {
					uart_puts_P( "B20/12" );
				}
				else if ( (i & DS18B20_11_BIT) == DS18B20_11_BIT ) {
					uart_puts_P( "B20/11" );
				}
				else if ( (i & DS18B20_10_BIT) == DS18B20_10_BIT ) {
					uart_puts_P( " B20/10 " );
				}
				else { // if ( (i & DS18B20_9_BIT) == DS18B20_9_BIT ) {
					uart_puts_P( "B20/09" );
				}
			}
			uart_puts_P(" ");

			DS18X20_meas_to_cel( id[0], sp, &subzero, &cel, &cel_frac_bits );
			DS18X20_uart_put_temp( subzero, cel, cel_frac_bits );

			decicelsius = DS18X20_raw_to_decicelsius( id[0], sp );
			if ( decicelsius == DS18X20_INVALID_DECICELSIUS ) {
				uart_puts_P("* INVALID *");
			} else {
				uart_puts_P(" conv: ");
				uart_put_int(decicelsius);
				uart_puts_P(" deci°C ");
				DS18X20_format_from_decicelsius( decicelsius, s, 10 );
				uart_puts_P(" fmt: ");
				uart_puts(s);
				uart_puts_P(" °C ");
			}

			uart_puts("\r");

		} // if meas-sensor

	} // loop all sensors
Exemplo n.º 7
0
/* verbose output rom-search follows read-scratchpad in one loop */
uint8_t DS18X20_read_meas_all_verbose( void )
{
	uint8_t id[OW_ROMCODE_SIZE], sp[DS18X20_SP_SIZE], diff;
	
	uint8_t i;
	uint16_t meas;
	
	uint8_t subzero, cel, cel_frac_bits;
	
	for( diff = OW_SEARCH_FIRST; diff != OW_LAST_DEVICE; )
	{
		diff = ow_rom_search( diff, &id[0] );

		if( diff == OW_PRESENCE_ERR ) {
		  uart_puts_P( "No Sensor found\r\n" );
		  return OW_PRESENCE_ERR;
		}
		
		if( diff == OW_DATA_ERR ) {
		  uart_puts_P( "Bus Error\r\n" );
		  return OW_DATA_ERR;
		}
		
		DS18X20_show_id_uart( id, OW_ROMCODE_SIZE );
		
		if( id[0] == DS18B20_ID || id[0] == DS18S20_ID ) {	 // temperature sensor
			
			uart_puts_P ("\r\n");
			
			ow_byte_wr( DS18X20_READ );			// read command
			
			for ( i=0 ; i< DS18X20_SP_SIZE; i++ )
				sp[i]=ow_byte_rd();
			
			show_sp_uart( sp, DS18X20_SP_SIZE );

			if ( crc8( &sp[0], DS18X20_SP_SIZE ) )
				uart_puts_P( " CRC FAIL " );
			else 
				uart_puts_P( " CRC O.K. " );
			uart_puts_P ("\r\n");
		
			meas = sp[0]; // LSB Temp. from Scrachpad-Data
			meas |= (uint16_t) (sp[1] << 8); // MSB
			
			uart_puts_P(" T_raw=");
			uart_puthex_byte((uint8_t)(meas>>8));
			uart_puthex_byte((uint8_t)meas);
			uart_puts_P(" ");

			if( id[0] == DS18S20_ID ) { // 18S20
				uart_puts_P( "S20/09" );
			}
			else if ( id[0] == DS18B20_ID ) { // 18B20
				i=sp[DS18B20_CONF_REG];
				if ( (i & DS18B20_12_BIT) == DS18B20_12_BIT ) {
					uart_puts_P( "B20/12" );
				}
				else if ( (i & DS18B20_11_BIT) == DS18B20_11_BIT ) {
					uart_puts_P( "B20/11" );
				}
				else if ( (i & DS18B20_10_BIT) == DS18B20_10_BIT ) {
					uart_puts_P( " B20/10 " );
				}
				else { // if ( (i & DS18B20_9_BIT) == DS18B20_9_BIT ) { 
					uart_puts_P( "B20/09" );
				}
			}			
			uart_puts_P(" ");
			
			DS18X20_meas_to_cel(id[0], sp, &subzero, &cel, &cel_frac_bits);
			
			DS18X20_uart_put_temp(subzero, cel, cel_frac_bits);
			
			uart_puts("\r\n");
			
		} // if meas-sensor
		
	} // loop all sensors