Suite à une suggestion sur le forum dédié à Energia et au MSP430 en général (http://forum NULL.43oh NULL.com/forum/28-energia/), j’ai procédé à une petite réécriture de ma librairie horloge temps-réel (http://xv4y NULL.radioclub NULL.asia/2012/05/22/bibliotheque-rtc-pour-le-msp430/) (Real Time Clock ou RTC) pour le MSP430. Le changement sont principalement cosmétiques mais quelques petits bogues ont été corrigés.

Les fichiers peuvent être téléchargés sur la page téléchargements (http://xv4y NULL.radioclub NULL.asia/boutique/docs/).

Ici le fichier de déclarations sRTC.h :

/*
 sRTC.h - Library for adding simple RTC capabilities using MSP430 hardware
 By Yannick DEVOS (XV4Y) - 2012-2013
 Any commercial use or inclusion in a kit is subject to author approval

 ====
 Revision history :
 v1.00    2012-05-22
 First release
 v1.01    2012-12-17
 Minor cosmetic changes
 v1.02    2012-12-18
 Strucutral changes to improve code cleaness
 Currently does not work with Energia009
 v1.03    2012-12-21
 Settings in constructor to override default Energia settings, work with Energia 009
 v1.04    2013-01-08
 Moved settings to begin(), corrected bug related to Energia 009 => Thanks Grahamf72 from 43oh forums

 ====
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You can download a copy of the GNU General Public License at <http://www.gnu.org/licenses/>

///////////////////////////////// How to use the lib

 * Create an instance of the object

 RealTimeClock myClock;

 * Do low-level Timer and Clock setup yourself or call begin();

 myClock.begin();

 * In order to have this RTC library working you should add this code to the end of your main program :

 interrupt(TIMER1_A0_VECTOR) Tic_Tac(void) {
	myClock++;		      // Update chunks
 };

 * Enjoy the clock reading the RTC_sec, RTC_min, RTC_hr variables

 */

// ensure this library description is only included once
#ifndef RTC_h
#define RTC_h

// library interface description
class RealTimeClock
{
	// user-accessible "public" interface
public:
	RealTimeClock(void);
	void begin(void);
	void Set_Time(char hr, char mins, char secs);
    int RTC_chunk; // This how you read the time, by reading the vars
    char RTC_sec; // This how you read the time, by reading the vars
    char RTC_min;
    char RTC_hr;
	void Inc_chunk(void); // This methode should be invoked by an Interrupt call (see top of the file comment)
	RealTimeClock& operator++();	// Overload ++ operator for writing convenience (Prefix Variant)
	RealTimeClock& operator++(int);	// PostFix variant

	// A few private methods
private:
	void Inc_sec(void);
	void Inc_min(void);
	void Inc_hr(void);	
};

#endif

Et le code par lui même sRTC.cpp :

/*
 sRTC.h - Library for adding simple RTC capabilities using MSP430 hardware
 By Yannick DEVOS (XV4Y) - 2012
 Any commercial use or inclusion in a kit is subject to author approval

 ====
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You can download a copy of the GNU General Public License at <http://www.gnu.org/licenses/>

 */

// include this library's description file
#include 
#include 

// Constructor /////////////////////////////////////////////////////////////////

RealTimeClock::RealTimeClock(void)
{

};

// Methods /////////////////////////////////////////////////////////////////

void RealTimeClock::begin(void) {

	BCSCTL1 &= ~DIVA_3;		// ACLK without divider, set it to DIVA_0
	BCSCTL3 |= XCAP_3;		// Internal 12.5pF cap for 32KHz crystal

	TA1CCTL0 = CCIE;             //  CCR0 interupt activated
	TA1CCR0 = 128-1;             // 4096 ticks of 32KHz XTal = 1 second, so 4 slices are 1 second => CCR0 counts N+1
	TA1CTL = TASSEL_1 | ID_0 | MC_1;  // Clock for TIMER 1 = ACLK, No division, up mode

	P2SEL |= (BIT6 | BIT7); // This is to override default Energia settings that set P2_6 and P2_7 to GPIO instead of ACLK
	BCSCTL3 = LFXT1S_0;		// Override default Energia setting sourcing ACLK from VLO, now source from XTal

	RTC_chunk = 0;
	RTC_sec = 0;
	RTC_min = 0;
	RTC_hr = 0;	

};

RealTimeClock& RealTimeClock::operator++() {	// Overload ++ operator for writing convenience (Prefix Variant)
	Inc_chunk();	// This just call Inc_chunk
	return *this;
};

RealTimeClock& RealTimeClock::operator++(int) {	// PostFix variant
	RealTimeClock tmp(*this);
	++(*this);
	return tmp;
};

void RealTimeClock::Inc_chunk(void) {
	RTC_chunk = RTC_chunk + 1;		      // Update chuncks
	if (RTC_chunk == 256) {
		RTC_chunk=0;
		Inc_sec();
	};
};

void RealTimeClock::Inc_sec(void) {
	RTC_sec = RTC_sec + 1;		      // Update seconds
	if (RTC_sec == 60) {
		RTC_sec=0;
		Inc_min();
	};
};

void RealTimeClock::Inc_min(void) {
	RTC_min = RTC_min + 1;		      // Update minutes
	if (RTC_min == 60) {
		RTC_min=0;
		Inc_hr();
	};
};

void RealTimeClock::Inc_hr(void) {
	RTC_hr = RTC_hr + 1;		      // Update hours
	if (RTC_hr == 24) {
		RTC_hr=0;
	};
};

void RealTimeClock::Set_Time(char hrs=0, char mins=0, char secs=0) {
	if ((hrs>=0 && hrs <24) && (mins>=0 && mins<60) && (secs>=0 && secs<60)) {
		RTC_hr = hrs;	// Set time to values given in parameters
		RTC_min = mins;
		RTC_sec = secs;
		RTC_chunk = 0;
	};
};