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Add function isPresent() to check if i2c connection has been established #279

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Add function isPresent() to check if i2c connection has been established #279

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15 changes: 11 additions & 4 deletions src/RTClib.h
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Original file line number Diff line number Diff line change
Expand Up @@ -324,6 +324,13 @@ class TimeSpan {
*/
/**************************************************************************/
class RTC_I2C {
public:
/*!
@brief Check if I2C device is present
@return true if present, false otherwise
*/
bool isPresent(void) { return i2c_dev != NULL; };

protected:
/*!
@brief Convert a binary coded decimal value to binary. RTC stores
Expand All @@ -348,7 +355,7 @@ class RTC_I2C {
@brief RTC based on the DS1307 chip connected via I2C and the Wire library
*/
/**************************************************************************/
class RTC_DS1307 : RTC_I2C {
class RTC_DS1307 : public RTC_I2C {
public:
bool begin(TwoWire *wireInstance = &Wire);
void adjust(const DateTime &dt);
Expand All @@ -367,7 +374,7 @@ class RTC_DS1307 : RTC_I2C {
@brief RTC based on the DS3231 chip connected via I2C and the Wire library
*/
/**************************************************************************/
class RTC_DS3231 : RTC_I2C {
class RTC_DS3231 : public RTC_I2C {
public:
bool begin(TwoWire *wireInstance = &Wire);
void adjust(const DateTime &dt);
Expand Down Expand Up @@ -403,7 +410,7 @@ class RTC_DS3231 : RTC_I2C {
@brief RTC based on the PCF8523 chip connected via I2C and the Wire library
*/
/**************************************************************************/
class RTC_PCF8523 : RTC_I2C {
class RTC_PCF8523 : public RTC_I2C {
public:
bool begin(TwoWire *wireInstance = &Wire);
void adjust(const DateTime &dt);
Expand All @@ -430,7 +437,7 @@ class RTC_PCF8523 : RTC_I2C {
@brief RTC based on the PCF8563 chip connected via I2C and the Wire library
*/
/**************************************************************************/
class RTC_PCF8563 : RTC_I2C {
class RTC_PCF8563 : public RTC_I2C {
public:
bool begin(TwoWire *wireInstance = &Wire);
bool lostPower(void);
Expand Down