Kenji Arai / M41T62

M41T62 is a serial real-time clock (RTC) made by STMicroelectronics.

Dependents:   LPC1114_data_logger Check_external_RTC LPC1114_barometer_with_data_logging

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M41T62 Class Reference
Public Member Functions

M41T62 Class Reference

Interface for RTC (I2C Interface) STMicroelectronics M41T62. More...

#include <m41t62_rtc.h>

Public Member Functions

 M41T62 (PinName p_sda, PinName p_scl)
 Configure data pin (with other devices on I2C line)
 M41T62 (I2C &p_i2c)
 Configure data pin (with other devices on I2C line)
void read_rtc_std (tm *)
 Read RTC data with Standard C "struct tm" format.
void write_rtc_std (tm *)
 Write data to RTC data with Standard C "struct tm" format.
void set_next_IRQ (uint16_t time)
 Set Alarm / IRQ time.
void clear_IRQ (void)
 Clear Alarm / IRQ pin interrupt.
void read_rtc_direct (rtc_time *)
 Read RTC data with own format.
void write_rtc_direct (rtc_time *)
 Read RTC data with own format.
void frequency (int)
 Set I2C clock frequency.
void set_sq_wave (sq_wave_t)
 Control Square wave output port.

Detailed Description

Interface for RTC (I2C Interface) STMicroelectronics M41T62.

Standalone type RTC via I2C interface

 #include "mbed.h"
 #include "m41t62_rtc.h"

 // I2C Communication
  M41T62      m41t62(dp5,dp27);   // STmicro RTC(M41T62) SDA, SCL
 // If you connected I2C line not only this device but also other devices,
 //     you need to declare following method.
  I2C         i2c(dp5,dp27);      // SDA, SCL
  M41T62      m41t62(i2c);        // STmicro RTC(M41T62)

 int main() {
 tm t;
 time_t seconds;
 char buf[40];

   m41t62.set_sq_wave(RTC_SQW_NONE); // Stop output for more low current
   while(1){
      m41t62.read_rtc_std(&t);       // read RTC data
      seconds = mktime(&t);
      strftime(buf, 40, "%I:%M:%S %p (%Y/%m/%d)", localtime(&seconds));
      printf("Date: %s\r\n", buf);
   }
 }

Definition at line 100 of file m41t62_rtc.h.

Constructor & Destructor Documentation

M41T62 ( PinName  p_sda,
PinName  p_scl 
)

Configure data pin (with other devices on I2C line)

Parameters:
dataSDA and SCL pins

Definition at line 18 of file m41t62_rtc.cpp.

M41T62 ( I2C &  p_i2c )

Configure data pin (with other devices on I2C line)

Parameters:
I2Cprevious definition

Definition at line 25 of file m41t62_rtc.cpp.

Member Function Documentation

void clear_IRQ ( void   )

Clear Alarm / IRQ pin interrupt.

Parameters:
none
Returns:
none

Definition at line 171 of file m41t62_rtc.cpp.

void frequency ( int  hz )

Set I2C clock frequency.

Parameters:
freq.
Returns:
none

Definition at line 198 of file m41t62_rtc.cpp.

void read_rtc_direct ( rtc_time *  tm )

Read RTC data with own format.

Parameters:
tm(data save area)
Returns:
none but all data in tm

Definition at line 82 of file m41t62_rtc.cpp.

void read_rtc_std ( tm *  t )

Read RTC data with Standard C "struct tm" format.

Parameters:
tm(data save area)
Returns:
none but all data in tm

Definition at line 38 of file m41t62_rtc.cpp.

void set_next_IRQ ( uint16_t  time )

Set Alarm / IRQ time.

Parameters:
nexttime (unit: minutes) from now on minimum = 2 minuteｓ!!
Returns:
none

Definition at line 153 of file m41t62_rtc.cpp.

void set_sq_wave ( sq_wave_t  sqw_dt )

Control Square wave output port.

Parameters:
output_mode
Returns:
none

Definition at line 204 of file m41t62_rtc.cpp.

void write_rtc_direct ( rtc_time *  tm )

Read RTC data with own format.

Parameters:
tm(save writing data)
Returns:
none but all data in tm

Definition at line 97 of file m41t62_rtc.cpp.

void write_rtc_std ( tm *  t )

Write data to RTC data with Standard C "struct tm" format.

Parameters:
tm(save writing data)
Returns:
none but all data in tm

Definition at line 63 of file m41t62_rtc.cpp.

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