//--------------------------------------------------------------------
void sht_switch_heating_element(unsigned char onoff, unsigned char pin)
//--------------------------------------------------------------------
// shwitches the internal heating element
// input onoff 0:off 1:on
{
unsigned char status;
unsigned char checksum;
sht_read_statusreg(&status, &checksum, pin);
if (onoff==0) status &= ~(HEATER_BIT);
else status |= (HEATER_BIT);
sht_write_statusreg(&status, pin);
}
unsigned char sht_scan(void)
{
unsigned char i,tmp;
NrSensorsAvailable = 0;
for (i=0x80;i>0;i/=2) // Shift true mask
{
CurrentSensorMask = i & ScanMask;
if (CurrentSensorMask) { // Check if this bit needs to be checked?
tmp = sht_read_statusreg();
if(tmp == 0){ // Check for a responce of the sensor 0 means no crc errors
NrSensorsAvailable++; // Aha, the sensor responded
SHTdevice_table[NrSensorsAvailable-1].mask = CurrentSensorMask; // Store the mask for later use
}
}
}
return NrSensorsAvailable;
}
