/*----------------------------------------------------------------------*
* Write multiple bytes to RTC RAM. *
* Valid address range is 0x00 - 0xFF, no checking. *
* Number of bytes (nBytes) must be between 1 and 31 (Wire library *
* limitation). *
* Returns the I2C status (zero if successful). *
*----------------------------------------------------------------------*/
byte DS3232RTC::writeRTC(byte addr, byte *values, byte nBytes)
{
i2cBeginTransmission(RTC_ADDR);
i2cWrite(addr);
for (byte i=0; i<nBytes; i++) i2cWrite(values[i]);
return i2cEndTransmission();
}
/*----------------------------------------------------------------------*
* Helper method to read a 8 bit value from the given register *
*----------------------------------------------------------------------*/
uint8_t I2CSoilMoistureSensor::readI2CRegister8bit(int addr, int reg) {
i2cBeginTransmission(addr);
i2cWrite(reg);
i2cEndTransmission();
delay(20);
i2cRequestFrom(addr, 1);
return i2cRead();
}
/*----------------------------------------------------------------------*
* Read multiple bytes from RTC RAM. *
* Valid address range is 0x00 - 0xFF, no checking. *
* Number of bytes (nBytes) must be between 1 and 32 (Wire library *
* limitation). *
* Returns the I2C status (zero if successful). *
*----------------------------------------------------------------------*/
byte DS3232RTC::readRTC(byte addr, byte *values, byte nBytes)
{
i2cBeginTransmission(RTC_ADDR);
i2cWrite(addr);
if ( byte e = i2cEndTransmission() ) return e;
i2cRequestFrom( (uint8_t)RTC_ADDR, nBytes );
for (byte i=0; i<nBytes; i++) values[i] = i2cRead();
return 0;
}
/*----------------------------------------------------------------------*
* Helper method to read a 16 bit signed value from the given register*
*----------------------------------------------------------------------*/
int I2CSoilMoistureSensor::readI2CRegister16bitSigned(int addr, int reg) {
i2cBeginTransmission(addr);
i2cWrite(reg);
i2cEndTransmission();
delay(20);
i2cRequestFrom(addr, 2);
int t = i2cRead() << 8;
t = t | i2cRead();
return t;
}
/*----------------------------------------------------------------------*
* Set the RTC's time from a tmElements_t structure. *
* Returns the I2C status (zero if successful). *
*----------------------------------------------------------------------*/
byte DS3232RTC::write(tmElements_t &tm)
{
i2cBeginTransmission(RTC_ADDR);
i2cWrite((uint8_t)RTC_SECONDS);
i2cWrite(dec2bcd(tm.Second));
i2cWrite(dec2bcd(tm.Minute));
i2cWrite(dec2bcd(tm.Hour)); //sets 24 hour format (Bit 6 == 0)
i2cWrite(tm.Wday);
i2cWrite(dec2bcd(tm.Day));
i2cWrite(dec2bcd(tm.Month));
i2cWrite(dec2bcd(tmYearToY2k(tm.Year)));
return i2cEndTransmission();
}
/*----------------------------------------------------------------------*
* Read the current time from the RTC and return it in a tmElements_t *
* structure. Returns the I2C status (zero if successful). *
*----------------------------------------------------------------------*/
byte DS3232RTC::read(tmElements_t &tm)
{
i2cBeginTransmission(RTC_ADDR);
i2cWrite((uint8_t)RTC_SECONDS);
if ( byte e = i2cEndTransmission() ) return e;
//request 7 bytes (secs, min, hr, dow, date, mth, yr)
i2cRequestFrom(RTC_ADDR, tmNbrFields);
tm.Second = bcd2dec(i2cRead() & ~_BV(DS1307_CH));
tm.Minute = bcd2dec(i2cRead());
tm.Hour = bcd2dec(i2cRead() & ~_BV(HR1224)); //assumes 24hr clock
tm.Wday = i2cRead();
tm.Day = bcd2dec(i2cRead());
tm.Month = bcd2dec(i2cRead() & ~_BV(CENTURY)); //don't use the Century bit
tm.Year = y2kYearToTm(bcd2dec(i2cRead()));
return 0;
}
/*----------------------------------------------------------------------*
* Sets the RTC's time from a tmElements_t structure and clears the *
* oscillator stop flag (OSF) in the Control/Status register. *
* Returns the I2C status (zero if successful). *
*----------------------------------------------------------------------*/
byte DS3232RTC::write(tmElements_t &tm)
{
i2cBeginTransmission(RTC_ADDR);
i2cWrite((uint8_t)RTC_SECONDS);
i2cWrite(dec2bcd(tm.Second));
i2cWrite(dec2bcd(tm.Minute));
i2cWrite(dec2bcd(tm.Hour)); //sets 24 hour format (Bit 6 == 0)
i2cWrite(tm.Wday);
i2cWrite(dec2bcd(tm.Day));
i2cWrite(dec2bcd(tm.Month));
i2cWrite(dec2bcd(tmYearToY2k(tm.Year)));
byte ret = i2cEndTransmission();
uint8_t s = readRTC(RTC_STATUS); //read the status register
writeRTC( RTC_STATUS, s & ~_BV(OSF) ); //clear the Oscillator Stop Flag
return ret;
}
/*----------------------------------------------------------------------*
* Helper method to write an 8 bit value to the sensor via I2C to the *
* given register *
*----------------------------------------------------------------------*/
void I2CSoilMoistureSensor::writeI2CRegister8bit(int addr, int reg, int value) {
i2cBeginTransmission(addr);
i2cWrite(reg);
i2cWrite(value);
i2cEndTransmission();
}
