DocID007016 Rev 2

7/11

AN1216

11

if ((octet >= 0x40) & (octet <= 0x49)) return (buffer-24);

if ((octet >= 0x50) & (octet <= 0x59)) return (buffer-30);

}

/**************************************************************************/

/* function Int_To_Char

*/

/* description :

This function convert an integer data

*/

/*

to BCD TIMEKEEPER format (unsigned char)

*/

/* input :

int integ

*/

/* output :

unsigned char

*/

/* example :

integ = 33

(0x21 in hexa)

*/

/*

Int_To_Char = 0x33

(51 in integer)

*/

/**************************************************************************/

unsigned char Int_To_Char(int integ)

{

char buffer;

buffer = (unsigned char)(integ);

if (integ <= 9) return(buffer);

if ((integ >= 10) & (integ <= 19)) return (buffer+6);

if ((integ >= 20) & (integ <= 29)) return (buffer+0x0C);

if ((integ >= 30) & (integ <= 39)) return (buffer+0x12);

if ((integ >= 40) & (integ <= 49)) return (buffer+0x18);

if ((integ >= 50) & (integ <= 59)) return (buffer+0x1E);

}

/*************************************************************************/

/* void Update_Next_Alarm

*/

/* description :

After alarm interupt, it will :

*/

/*

- reset the TIMEKEEPER IT flag

*/

/*

- read the actual time in the clock register

*/

/*

- calculate the next alarm time

*/

/*

- update the alarm register

*/

/*

to prepare for the next alarm

*/

/* input :

alarm period (al_hour, al_minute, al_second)

*/

/* output :

nothing

*/

/*************************************************************************/

void Update_Next_Alarm(int al_hour,int al_minute,int al_second)

{

// time carry, going to be used for hour, minute and second

// calculation process.

unsigned char time_flag = 0;

// intermediate storage for alarm data.

int buffsec;

int buffmin;

int buffhour;

// temporary storage

unsigned char buffchar;

// Touch the flag register to reset TIMEKEEPER AF flag (interupt)

buffchar = *TKPER_FLAG;

/*****************************************************************/

/* This is to update the alarm second register.

*/

/* It will test if RPT1 is set. If not then it adds “al_second”

*/

/* to second alarm register. It takes care of the minute carry.

*/

/*****************************************************************/

if (!(*TKPER_AL_SEC & 0x80))

// if !RPT1

{

// update register with carry

buffsec = Char_To_Int(*TIMEKEEPER_SEC) + al_second;

if (buffsec > 59)

// if >59

{

// then restore 60sec format