/*
* get temperature
*/
double ds18b20_gettemp() {
uint8_t temperature_l;
uint8_t temperature_h;
double retd = 0;
#if DS18B20_STOPINTERRUPTONREAD == 1
cli();
#endif
ds18b20_reset(); //reset
ds18b20_writebyte(DS18B20_CMD_SKIPROM); //skip ROM
ds18b20_writebyte(DS18B20_CMD_CONVERTTEMP); //start temperature conversion
while(!ds18b20_readbit()); //wait until conversion is complete
ds18b20_reset(); //reset
ds18b20_writebyte(DS18B20_CMD_SKIPROM); //skip ROM
ds18b20_writebyte(DS18B20_CMD_RSCRATCHPAD); //read scratchpad
//read 2 byte from scratchpad
temperature_l = ds18b20_readbyte();
temperature_h = ds18b20_readbyte();
#if DS18B20_STOPINTERRUPTONREAD == 1
sei();
#endif
char buffer[10];
sprintf(buffer,"%d:%d\n\r",temperature_h,temperature_l);
USART1_sendStr(buffer);
//convert the 12 bit value obtained
retd = ( ( temperature_h << 8 ) + temperature_l ) * 0.0625;
return retd;
}
double ds18b20_gettemp(void){
uint8_t temperature_l;
uint8_t temperature_h;
double retd = 0;
#if DS18B20_StopInterruptOnRead == 1
cli();
#endif
ds18b20_reset();
ds18b20_writebyte(DS18B20_SkipROM);
ds18b20_writebyte(DS18B20_ConvertTemp);
while(!ds18b20_readbit());
ds18b20_reset();
ds18b20_writebyte(DS18B20_SkipROM);
ds18b20_writebyte(DS18B20_RScratchPad);
temperature_l = ds18b20_readbyte();
temperature_h = ds18b20_readbyte();
#if DS18B20_StopInterruptOnRead==1
sei();
#endif
retd = ((temperature_h << 8) + temperature_l) * 0.0625;
return retd;
}
/*
* get temperature
*/
double ds18b20_gettemp() {
uint8_t temperature[2];
int8_t digit;
uint16_t decimal;
double retd = 0;
ds18b20_reset(); //reset
ds18b20_writebyte(DS18B20_CMD_SKIPROM); //skip ROM
ds18b20_writebyte(DS18B20_CMD_CONVERTTEMP); //start temperature conversion
while(!ds18b20_readbit()); //wait until conversion is complete
ds18b20_reset(); //reset
ds18b20_writebyte(DS18B20_CMD_SKIPROM); //skip ROM
ds18b20_writebyte(DS18B20_CMD_RSCRATCHPAD); //read scratchpad
//read 2 byte from scratchpad
temperature[0] = ds18b20_readbyte();
temperature[1] = ds18b20_readbyte();
ds18b20_reset(); //reset
//store temperature integer digits
digit = temperature[0]>>4;
digit |= (temperature[1]&0x7)<<4;
//store temperature decimal digits
decimal = temperature[0]&0xf;
decimal *= DS18B20_DECIMALSTEPS;
//compose the double temperature value and return it
retd = digit + decimal * 0.0001;
return retd;
}
/*
* read one byte
*/
uint8_t ds18b20_readbyte(void){
uint8_t i=8, n=0;
while(i--){
n >>= 1;
n |= (ds18b20_readbit()<<7);
}
return n;
}
/*
* get temperature
*/
double ds18b20_gettemp() {
uint8_t scratchpad[SCRATCHPAD_SIZE];
uint8_t i;
double temp_value = DS18B20_ERR;
cli();
// reset
if (ds18b20_reset())
{
sei();
return DS18B20_ERR;
}
ds18b20_writebyte(DS18B20_CMD_SKIPROM); //skip ROM
ds18b20_writebyte(DS18B20_CMD_WSCRATCHPAD); //write to scratchpad
ds18b20_writebyte(0x00); //alarm trigger TH
ds18b20_writebyte(0x00); //alarm trigger TL
ds18b20_writebyte(DS18B20_RES); //conversion resolution
// reset
if (ds18b20_reset())
{
sei();
return DS18B20_ERR;
}
ds18b20_writebyte(DS18B20_CMD_SKIPROM); //skip ROM
ds18b20_writebyte(DS18B20_CMD_CONVERTTEMP); //start temperature conversion
sei();
while(!ds18b20_readbit()); //wait until conversion is complete
cli();
// reset
if (ds18b20_reset())
{
sei();
return DS18B20_ERR;
}
ds18b20_writebyte(DS18B20_CMD_SKIPROM); //skip ROM
ds18b20_writebyte(DS18B20_CMD_RSCRATCHPAD); //read scratchpad
//read scratchpad
for (i=0; i<SCRATCHPAD_SIZE; i++)
scratchpad[i] = ds18b20_readbyte();
sei();
if (crc8(scratchpad, SCRATCHPAD_SIZE - 1) == scratchpad[SCRATCHPAD_CRC])
//convert the value obtained
temp_value = ((scratchpad[SCRATCHPAD_TEMP_H] << 8) + scratchpad[SCRATCHPAD_TEMP_L]) * 0.0625;
return temp_value;
}