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Add new method to obtain the time and date from the RTC without requiring a DateTime object. #73

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Add new method to obtain the time and date from the RTC without requiring a DateTime object. #73

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2d13fd1
Correct #elif typo
Mark-Wills Jan 26, 2025
28ca252
Merge branch 'Zanduino:master' into master
Mark-Wills Feb 10, 2025
ece1038
Add new getTimeDate method to get the time from the RTC without the n…
Mark-Wills Feb 10, 2025
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19 changes: 19 additions & 0 deletions src/MCP7940.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -53,6 +53,8 @@ static uint8_t conv2d(const char* p) {
if ('0' <= *p && *p <= '9') { v = *p - '0'; } // of if-then character in range
return 10 * v + *++p - '0';
} // of method conv2d


DateTime::DateTime(uint32_t t) {
/*!
@brief DateTime constructor (overloaded)
Expand Down Expand Up @@ -877,3 +879,20 @@ bool MCP7940_Class::clearPowerFail() const {
I2C_write(MCP7940_RTCWKDAY, readByte(MCP7940_RTCWKDAY));
return true;
} // of method clearPowerFail()
bool MCP7940_Class::getTimeDate(DateTime_t &dateTimeStuct) const
{
/*!
@brief Reads the current date/time from the RTC and populates the DateTime_t structure. Avoids creating a DateTime object.
@return True if the RTC was read successfully, otherwise false.
*/
uint8_t readBuffer[7] = {0};
uint8_t bytesRead = I2C_read(MCP7940_RTCSEC, readBuffer);
dateTimeStuct.year = bcd2int(readBuffer[6]) + 2000;
dateTimeStuct.month = bcd2int(readBuffer[5] & 0x1F);
dateTimeStuct.day = bcd2int(readBuffer[4] & 0x3F);
dateTimeStuct.hour = bcd2int(readBuffer[2] & 0x3F);
dateTimeStuct.minute = bcd2int(readBuffer[1] & 0x7F);
dateTimeStuct.second = bcd2int(readBuffer[0] & 0x7F);
dateTimeStuct.weekday = readBuffer[3] & 0x07;
return bytesRead == 7;
} // of method getTimeDate()
20 changes: 18 additions & 2 deletions src/MCP7940.h
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Original file line number Diff line number Diff line change
Expand Up @@ -178,7 +178,22 @@ const uint8_t MCP7940_ALM0IF{3}; ///< ALM0WKDAY register
const uint8_t MCP7940_ALM1IF{3}; ///< ALM1WKDAY register
const uint32_t SECS_1970_TO_2000{946684800}; ///< Seconds between year 1970 and 2000

class DateTime {
struct DateTime_t
{
/*!
@struct DateTime_t
@brief Structure to hold date and time information
*/
uint8_t second;
uint8_t minute;
uint8_t hour;
uint8_t weekday;
uint8_t day;
uint8_t month;
uint16_t year;
};
class DateTime
{
/*!
@class DateTime
@brief Simple general-purpose date/time class
Expand Down Expand Up @@ -225,7 +240,7 @@ class DateTime {
uint8_t hh; ///< Internal hour value
uint8_t mm; ///< Internal minute value
uint8_t ss; ///< Internal seconds
}; // of class DateTime definition
}; // of class DateTime definition
class TimeSpan {
/*!
@class TimeSpan
Expand Down Expand Up @@ -296,6 +311,7 @@ class MCP7940_Class {
int32_t getPPMDeviation(const DateTime& dt) const;
void setSetUnixTime(uint32_t aTime);
uint32_t getSetUnixTime() const;
bool getTimeDate(DateTime_t& dt) const;

/*************************************************************************************************
** Template functions definitions are done in the header file **
Expand Down
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