/*
* 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);
}
/* 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;
}
/* 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;
}
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;
}
}
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;
}
}
/* 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
/* 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
