Diff: DS3231.h

Revision:

0:11dfd7ac4188

Child:

1:84ccc64067d8

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DS3231.h	Sat Dec 22 19:23:19 2012 +0000
@@ -0,0 +1,216 @@
+/** mbded library for driving the PMAXIM DS3231 Real Time Clock
+* datasheet link : http://datasheets.maximintegrated.com/en/ds/DS3231.pdf
+* breakout       : MACETECH ChronoDot V2.1 High Precision RTC
+* remi cormier 2012
+* WARNING : sda and sdl should be pulled up with 2.2k resistor
+*/
+
+/** Example code
+* @code
+// DS3231 Library test program
+// remi cormier 2012
+
+#include "mbed.h"
+#include "DS3231.h"
+
+Serial pc(USBTX, USBRX);
+
+int hour;
+int minute;
+int second;
+
+int dayOfWeek;
+int date;
+int month;
+int year;  
+   
+DS3231 RTC(p28,p27);
+
+
+int main()
+    {printf("\r\n\nDS3231 Library test program\r\nremi cormier 2012\r\n\n");
+    
+     RTC.setI2Cfrequency(400000);
+    
+     //RTC.writeRegister(DS3231_Aging_Offset,0); // uncomment to set Aging Offset 1LSB = approx. 0.1 ppm according from datasheet = 0.05 ppm @ 21 °C from my measurments
+      
+     int reg=RTC.readRegister(DS3231_Aging_Offset);
+     if (reg>127)
+        {reg=reg-256;}
+     pc.printf("Aging offset : %i\r\n",reg);
+         
+     pc.printf("OSF flag : %i",RTC.OSF());
+     pc.printf("\r\n");
+     
+     RTC.readDate(&date,&month,&year);
+     pc.printf("date : %02i-%02i-%02i",date,month,year);
+     pc.printf("\r\n");
+     
+     //RTC.setTime(19,48,45); // uncomment to set time
+     
+     RTC.readTime(&hour,&minute,&second);
+     pc.printf("time : %02i:%02i:%02i",hour,minute,second);
+     pc.printf("\r\n");
+     
+     //RTC.setDate(6,22,12,2012); // uncomment to set date
+     
+     RTC.readDateTime(&dayOfWeek,&date,&month,&year,&hour,&minute,&second);
+     pc.printf("date time : %i / %02i-%02i-%02i %02i:%02i:%02i",dayOfWeek,date,month,year,hour,minute,second);
+     pc.printf("\r\n");
+     
+     pc.printf("temperature :%6.2f",RTC.readTemp());
+     pc.printf("\r\n");
+    }
+* @endcode
+*/
+
+
+#include "mbed.h"
+
+#ifndef MBED_DS3231_H
+#define MBED_DS3231_H
+
+//DS3231 8 bit adress
+#define DS3231_Address          0xD0
+
+//DS3231 registers
+#define DS3231_Seconds          0x00
+#define DS3231_Minutes          0x01
+#define DS3231_Hours            0x02
+// DS3231 Hours bits
+#define DS3231_bit_AM_PM        0x20
+#define DS3231_bit_12_24        0x40
+
+#define DS3231_Day              0x03
+#define DS3231_Date             0x04
+#define DS3231_Month_Century    0x05
+#define DS3231_Year             0x06
+#define DS3231_Alarm1_Seconds   0x07
+#define DS3231_Alarm1_Minutes   0x08
+#define DS3231_Alarm1_Hours     0x09
+#define DS3231_Alarm1_Day_Date  0x0A
+#define DS3231_Alarm2_Minutes   0x0B
+#define DS3231_Alarm2_Hours     0x0C
+#define DS3231_Alarm_2_Day_Date 0x0D
+
+#define DS3231_Control          0x0E
+// DS3231 Control bits
+#define DS3231_bit_A1IE        1
+#define DS3231_bit_A2IE        2
+#define DS3231_bit_INTCN       4
+#define DS3231_bit_SQW_1Hz     0
+#define DS3231_bit_SQW_1024Hz  8
+#define DS3231_bit_SQW_4096Hz 16
+#define DS3231_bit_SQW_8192Hz 24
+#define DS3231_bit_CONV       32
+#define DS3231_bit_BBSQW      64
+#define DS3231_bit_EOSCb     128
+
+
+#define DS3231_Control_Status   0x0F
+// DS3231 Control/Status bits
+#define DS3231_bit_BSY     0x04
+#define DS3231_bit_EN32kHz 0x08
+#define DS3231_bit_OSF     0x80
+
+#define DS3231_Aging_Offset     0x10
+#define DS3231_MSB_Temp         0x11
+#define DS3231_LSB_Temp         0x12
+
+/* Interface to MAXIM DS3231 RTC */
+class DS3231
+    {public :
+     /** Create an instance of the DS3231 connected to specfied I2C pins
+     *
+     * @param sda The I2C data pin
+     * @param scl The I2C clock pin
+     */
+     DS3231(PinName sda, PinName scl);
+     
+     /** set I2C bus speed
+     * @param frequency : I2C clocl frequenct (Hz)
+     */
+     void setI2Cfrequency(int frequency);
+     
+     /** Read the temperature
+     *
+     * @return The temperature
+     */
+     float readTemp();
+     
+     /** Read the time registers
+     * @param hours
+     * @param minutes
+     * @param seconds
+     */
+     void readTime(int *hours, int *minutes, int *seconds);
+     
+     
+     /** Set the time registers
+     * @param hours
+     * @param minutes
+     * @param seconds
+     */
+     void setTime(int hours, int minutes, int seconds);
+     
+     /** Read the date registers
+     * @param date
+     * @param month
+     * @param year
+     */
+     void readDate(int *date, int *month, int *year);
+     
+     /** Set the date registers
+     * @param dayOfWeek : day of week
+     * @param date
+     * @param month
+     * @param year
+     */
+     void setDate(int dayOfWeek, int date, int month, int year);
+     
+     /** Read the date and time registers
+     * @param dayOfWeek : day of week
+     * @param date
+     * @param month
+     * @param year
+     * @param hours
+     * @param minutes
+     * @param seconds
+     */
+     void readDateTime(int *dayOfWeek, int *date, int *month, int *year, int *hours, int *minutes, int *seconds);
+     
+     /** Read a register
+     * @param reg : register address
+     * @return The register content
+     */     
+     int readRegister(char reg);
+     
+     /** Write to a register
+     * @param reg : register address
+     * @param The register content
+     */       
+     void writeRegister(int reg,char byte);
+     
+     /** set OSF (Oscillator Stop Flag) bit to 0 in Control Status register
+     * should be done just after power up DS3231
+     * OSF bit is automaticaly set to 1 when on power up or when the DS3231 oscillator stops
+     */
+     void eraseOSF();
+     
+     /** Return OSF bit. If true the oscillator stopped or the DS3231 just powered up
+     * @return The OSF bit
+     */
+     bool OSF();
+     
+     bool error;
+     
+     private :
+     I2C i2c;
+     int bcd2dec(int k); // bcd to decimal conversion
+     int dec2bcd(int k); // decimal to bcd conversion
+     void decodeTime(int regHours, int regMinutes, int regSeconds,int *Hours, int *Minutes, int *Seconds);
+     void decodeDate(int regDate,int regMonth, int regYear, int *date, int *month, int *year);
+    };
+
+
+#endif
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