Diff: Rtc_Mcp97410.h

Revision:

10:780027029afe

Parent:

7:dca20be3ef38

Child:

11:ef48dcb888c9

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Rtc_Mcp97410.h	Wed Jan 07 21:46:02 2015 +0000
@@ -0,0 +1,189 @@
+/* Rtc_Mcp97410.h */
+/*
+Support for Michrochip RTC MCP97410
+Should work for MCP97410, MCP97411, MCP97412 - see datasheet
+Based on Library for DS1307
+Chips are similar but not equal!
+Ported for MCP97410 by Karl Zweimueller
+
+Original Copyright (c) 2013 Henry Leinen (henry[dot]leinen [at] online [dot] de)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+#ifndef __RTC_MCP97410_H__
+#define __RTC_MCP97410_H__
+
+
+
+/** Class Rtc_Mcp97410 implements the real time clock module MCP97410
+ *
+ * You can read the clock and set a new time and date.
+ * It is also possible to start and stop the clock.
+ * Rtc_Mcp97410 allows you to display the time in a 12h or 24h format.
+ * Based on Library for DS1307 by Henry Leinen.
+ * Ported for MC97410 by Karl Zweimueller.
+ */
+class Rtc_Mcp97410
+{
+public:
+    /** Structure which is used to exchange the time and date
+     */
+    typedef struct {
+        int sec;        /*!< seconds [0..59] */
+        int min;        /*!< minutes {0..59] */
+        int hour;       /*!< hours [0..23] */
+        int wday;       /*!< weekday [1..7, where 1 = sunday, 2 = monday, ... */
+        int date;       /*!< day of month [0..31] */
+        int mon;        /*!< month of year [1..12] */
+        int year;       /*!< year [2000..2255] */
+    } Time_rtc;
+
+
+    /** RateSelect specifies the valid frequency values for the square wave output
+     */
+    typedef enum {
+        RS1Hz = 0,
+        RS4kHz = 1,
+        RS8kHz = 2,
+        RS32kHz = 3
+    } SqwRateSelect_t;
+
+protected:
+    I2C*    m_rtc;
+
+    static const char *m_weekDays[];
+
+public:
+    /** public constructor which creates the real time clock object
+     *
+     * @param i2c : Pointer to I2C-Object for I2C-Interface.
+     *
+     */
+    Rtc_Mcp97410(I2C* i2c);
+
+    ~Rtc_Mcp97410();
+
+    /** Read the current time from RTC chip
+     *
+     * @param time : reference to a struct tm which will be filled with the time from rtc
+     *
+     * @returns true if successful, otherwise an acknowledge error occured
+     */
+    virtual bool getTime(Time_rtc& time);
+
+    /** Write the given time onto the RTC chip (and enable Battery-Backup)
+     *
+     * @param time : refereence to a struct which contains valid date and time information
+     *
+     * @param start : contains true if the clock shall start (or keep on running).
+     *
+     * @param thm : 12-hour-mode if set to true, otherwise 24-hour-mode will be set.
+     *
+     * @returns true if successful, otherwise an acknowledge error occured
+     */
+    virtual bool setTime(Time_rtc& time, bool start, bool thm);
+
+    /** Start the clock. Please note that the seconds register need to be read and
+     * written in order to start or stop the clock. This can lead to an error
+     * in the time value. The recommended way of starting and stoping the clock is
+     * to write the actual date and time and set the start bit accordingly.
+     *
+     * @returns true if the clock was started, false if a communication error occured
+     */
+    bool startClock();
+
+    /** Stop the clock. Please note that the seconds register need to be read and
+     * written in order to start or stop the clock. This can lead to an error
+     * in the time value. The recommended way of starting and stoping the clock is
+     * to write the actual date and time and set the start bit accordingly.
+     *
+     * @returns true if the clock was stopped, false if a communication error occured
+     */
+    bool stopClock();
+
+    /** Service function to convert a weekday into a string representation
+     *
+     * @param wday : day of week to convert (starting with sunday = 1, monday = 2, ..., saturday = 7
+     *
+     * @returns the corresponding string representation
+     */
+    const char* weekdayToString( int wday ) {
+        return m_weekDays[wday%7];
+    }
+
+    /** Enable Square Wave output. The function enables or disables the square wave output
+     * of the module and sets the desired frequency.
+     *
+     * @param ena : if set to true, the square wave output is enabled.
+     *
+     * @param rs : rate select, can be either one of the four values defined by type /c RateSelect_t
+     *
+     * @return true if the operation was successful or false otherwise
+     */
+    bool setSquareWaveOutput(bool ena, SqwRateSelect_t rs);
+
+private:
+    bool read(int address, char* buffer, int len);
+    bool write(int address, char* buffer, int len);
+
+    static int bcdToDecimal(int bcd) {
+        return ((bcd&0xF0)>>4)*10 + (bcd&0x0F);
+    }
+
+    static int decimalToBcd(int dec) {
+        return (dec%10) + ((dec/10)<<4);
+    }
+};
+
+
+
+typedef void (*RtcCallback_t) (void);
+
+
+class RtcCls : public Rtc_Mcp97410
+{
+protected:
+    InterruptIn                 m_sqw;
+    bool                        m_bUseSqw;
+    time_t                      m_time;             //  Only used in case SQW is used
+    
+    bool                        m_bAlarmEnabled;
+    RtcCallback_t               m_alarmfunc;
+    time_t                      m_alarmTime;
+    
+public:
+    RtcCls(I2C* i2c, PinName sqw, bool bUseSqw);
+    
+protected:
+    void _callback(void);
+    
+public:
+    time_t                      getTime();
+    virtual bool                getTime(Time_rtc& time)                         { return Rtc_Mcp97410::getTime(time); }
+    void                        setTime(time_t time);
+    virtual bool                setTime(Time_rtc& time, bool start, bool thm)   { return Rtc_Mcp97410::setTime(time, start, thm); }
+public:
+    void                        setAlarm(int nSeconds, RtcCallback_t alarmfunc) {
+        m_alarmfunc = alarmfunc;
+        m_alarmTime = m_time + nSeconds;
+        m_bAlarmEnabled = (alarmfunc == NULL) ? false : true;
+    }
+};
+
+#endif // __RTC_MCP97410_H__
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