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//Clock.c 
// 
//Body: HT48C50-1 
//Mask option 
//BZ/BZB : All Disable 
//SysFreq: 400KHz 
//the others use the default value 
 
#include  
 
#define _tmr1c4 _11_4  //timer4 enable bit 
#define min_adj_button  _pb0 
#define hour_adj_button _pb1 
 
#pragma vector isr_4 @ 0x4 
#pragma vector isr_8 @ 0x8 
#pragma vector isr_c @ 0xc 
 
//ISR for safequard 
void isr_4(){} // external ISR 
void isr_8(){} // timer/event 0 
 
//initialize registers for safeguard 
void safeguard_init(){ 
        _intc = 0; 
        _tmr0c = 0; 
        _tmr0 = 0; 
        _tmr1c = 0; 
        _tmr1h = 0; 
        _tmr1l = 0; 
        _pac = 0xff; 
        _pbc = 0xff; 
        _pcc = 0xff; 
        _pdc = 0xff; 
} 
 
void initial(); 
void check_time(); 
void show_clock(); 
unsigned char min_adj_pressed(); 
unsigned char hour_adj_pressed(); 
void min_adjust(); 
void hour_adjust(); 
void arrange_hour(); 
void set_timer(); 
 
unsigned char half_second; 
unsigned char min_l, min_h; 
unsigned char hour_l, hour_h; 
 
void main(){ 
 
        safeguard_init(); 
        initial(); 
 
        while(1){ 
                check_time(); 
                show_clock(); 
                if (min_adj_pressed())  min_adjust(); 
                if (hour_adj_pressed()) hour_adjust(); 
        } 
} 
 
void isr_c(){           //timer1 
        half_second++; 
        _pb = ~_pb;     //flash 'dot' every 0.5 second 
} 
 
void initial(){ 
        _pac = 0;       //set port A to output port 
        _pbc = 0x7f;    //set port B to input port exclude pb7 
        _pb = 0; 
        _pa = 0; 
 
        min_l = 0; 
        min_h = 0; 
        hour_l = 0; 
        hour_h = 0; 
        half_second = 0; 
 
        _intc = 0x9;    //enable timer1 
        _tmr1c = 0x80;  //timer1 mode (internal clock) 
        set_timer(); 
} 
 
//check if the min_adj_button is pressed or not 
//return 1: if the min_adj_button is pressed 
//       0: otherwise 
unsigned char min_adj_pressed(){ 
        if (min_adj_button == 0){//pressed 
                _delay(2000); //debounce 
                if (min_adj_button == 0) 
                        return 1; //still pressed, recognize it 
        } 
        return 0; 
} 
 
//check if the hour_adj_button is pressed or not 
//return 1: if the hour_adj_button is pressed 
//       0: otherwise 
unsigned char hour_adj_pressed(){ 
        if (hour_adj_button == 0){//pressed 
                _delay(2000); //debounce 
                if (hour_adj_button == 0) 
                        return 1; //still pressed, recognize it 
        } 
        return 0; 
} 
 
void check_time(){ 
        if (half_second >= 120){ 
                half_second -= 120; 
                min_l++; 
                if (min_l >= 10){ 
                        min_l = 0; 
                        min_h++; 
                        if (min_h >= 6){ 
                                min_h = 0; 
                                hour_l++; 
                                arrange_hour(); 
                        } 
                } 
        } 
} 
 
//This function is to arrange the hour value 
void arrange_hour(){ 
        if (hour_h == 2 && hour_l == 4){ 
                hour_h = 0; 
                hour_l = 0; 
        } 
        else if (hour_l == 10){ 
                hour_l = 0; 
                hour_h++; 
        } 
} 
 
void show_clock(){ 
        _pa = min_l | 0x10; 
        _pa = min_h | 0x20; 
        _pa = hour_l | 0x40; 
        _pa = hour_h | 0x80; 
} 
 
//This function is to adjust the minute. 
//The minute will increase 1 when the min_adj_button is pressed . 
//If the button is held longer than 1.5 seconds, the minute will 
//increase 1 every 0.5 second 
void min_adjust(){ 
        bit held_long_time = 0; 
         
repeat_inc: 
        min_l++; 
        if (min_l >= 10){ 
                min_l = 0; 
                min_h++; 
                if (min_h >= 6) //don't care hour 
                        min_h = 0; 
        } 
        half_second = 0; 
        while(min_adj_button == 0){//while min_adj_button is held 
                show_clock(); 
                if (!held_long_time){ 
                        if (half_second>2){         //longer than 1.5 seconds 
                                held_long_time = 1; //set flag 
                                goto repeat_inc;    //increase minute 
                        } 
                        //less than 1.5 seconds, do nothing 
                } 
                else{ 
                        if (half_second) 
                                goto repeat_inc; //add 1 every 0.5 second 
                        //less than 0.5 second, do nothing 
                } 
        } 
        half_second = 0; 
        set_timer(); 
} 
 
//This function is to adjust the hour. 
//The hour will increase 1 when the hour_adj_button is pressed . 
//If the button is held longer than 1.5 seconds, the hour will 
//increase 1 every 0.5 second 
void hour_adjust(){ 
        bit held_long_time = 0; 
         
repeat_inc: 
        hour_l++; 
        arrange_hour(); 
        half_second = 0; 
        while(hour_adj_button == 0){ 
                show_clock(); 
                if (!held_long_time){ 
                        if (half_second>2){         //longer than 1.5 seconds 
                                held_long_time = 1; //set flag 
                                goto repeat_inc;    //increase hour 
                        } 
                        //less than 1.5 seconds, do nothing 
                } 
                else{ 
                        if (half_second) 
                                goto repeat_inc; //add 1 every 0.5 second 
                        //less than 0.5 second, do nothing 
                } 
        } 
        half_second = 0; 
        set_timer(); 
} 
 
void set_timer(){ 
        _tmr1c4 = 0; 
        _tmr1l = 0xb0; 
        _tmr1h = 0x3c; 
        _tmr1c4 = 1;    //start timer1   
}