/* ========================================================================== */ /* ClockPIC.c */ /* (c) 2007 St */ /* */ /* Program for nixie clock controlled by PIC16F627A or PIC16F628A */ /* Xtall frequency: 32.768 kHz (External clock for Timer1) */ /* Compiler: HI-TEC PICC-Lite */ /* ========================================================================== */ #include #define word unsigned int #define byte unsigned char // Definition of PIN connection #define POSITION0 RA7 // digit anode switches #define POSITION1 RA6 #define POSITION2 RA0 #define POSITION3 RB5 #define POSITION4 RB4 #define POSITION5 RB2 #define DIGIT0 RB1 // outputs for nixie driver 74141 #define DIGIT1 RA2 #define DIGIT2 RA3 #define DIGIT3 RB0 #define BUZZER RB3 // alarm buzzer #define KEYINP RA4 // button input // Connection of function buttons to digit positions #define KEYMENU 4 #define KEYUP 3 #define KEYENTER 2 // Global variables used in main loop and in the timer interrupt // counter for 2 miliseconds ticks word milisec = 0; // arrays for real time, alarm and auxiliary time during setting byte time[6],alarm[6],auxtime[6]; // pressed button code, half second flag (for alarm and blink), blinking position byte button = 0, halfsec = 0, blink = 0xF; // pointer which array to display byte *p_digit = time; // wait for button pressed or 20 second time-out void waitbutton(void) { word i; byte n; for(n=0; n<200; n++) { // Wait for about 100 msec for(i=0; i<10000; i++) {} if(button) break; } } // wait for all buttons released void endbutton(void) { word i; while(button) { button = 0; for(i=0; i<10000; i++) {} } } // function for setting array "setdata" with a new time // seconds are not updated, just only hours and minutes byte settime(byte *setdata) { byte posit = 2, updated = 0, next = 1; while(next) { blink = posit; // updated position blinks waitbutton(); // Test buttons and do 1 of 4 possibilities switch(button) { case KEYMENU : next = 0; break; // Stop updating time case KEYENTER: { // Move to next digit posit++; if(posit == 6) posit = 2; } break; case KEYUP : { // Increment digit on this position setdata[posit]++; if(((posit == 2) || (posit == 4)) && (setdata[posit] == 10)) setdata[posit]=0; if((posit == 3) && (setdata[posit] == 6)) setdata[posit]=0; if((posit == 5) && (setdata[posit] == 3)) setdata[posit]=0; updated = 1; } break; default : next = 0; // Time-out expired } endbutton(); } // Hours above 23 are not allowed if((setdata[5] == 2) && (setdata[4] > 3)) { setdata[5] = 0; setdata[4] = 0; } blink = 0xF; return(updated); } // **************************** // Main program function // // **************************** void main(void) { // Default values for start time[4] = 7; time[3] = 3; alarm[4] = 7; alarm[3] = 4; alarm[1] = 0xF; alarm[0] = 0xF; // Turn comparators off CMCON = 0x07; // Set Port I/O TRISA = 0b00110000; TRISB = 0b10000000; /* Init TIMER1 for 2 milisec period - external 32 kHz clock*/ T1CON = 0b00001011; // Timer control register TMR1L = 0; // About 1 sec to start TMR1H = 0x80; // start Timer TMR1IE = 1; // Enable interrupt from Timer1 PEIE = 1; GIE=1; /* enable interrupts */ /***** Main loop of program *****/ for(;;) { // Set Alarm Buzzer if time == alarm time if((time[5] == alarm[5]) && (time[4] == alarm[4]) && (time[3] == alarm[3]) && (time[2] == alarm[2]) && halfsec) BUZZER = 0; else BUZZER = 1; if(button == KEYMENU) { // Menu button enters time updating endbutton(); p_digit = alarm; if(!settime(alarm)) { // Alarm was not updated, try Time GIE = 0; // Stop interrupt during copy // We must not destroy real Time, copy it to auxiliary array auxtime[5] = time[5];auxtime[4] = time[4];auxtime[3] = time[3];auxtime[2] = time[2]; GIE = 1; p_digit = auxtime; if(settime(auxtime)) { // Time was updated - copy it back GIE = 0; time[5] = auxtime[5];time[4] = auxtime[4];time[3] = auxtime[3]; time[2] = auxtime[2];time[1] = 0;time[0] = 0; GIE = 1; } } p_digit = time; } else button = 0; } /* loop forever */ /* please make sure that you never leave main */ } /* ** =================================================================== ** Interrupt handler ** =================================================================== */ static void interrupt isr(void) { static const byte tabledigit[] = {3,2,7,4,1,9,8,0,5,6,0xF,0xF,0xF,0xF,0xF,0xF}; static byte position = 0; static byte auxdigit; TMR1L = 0xC1; // New value for next TMR1H = 0xFF; // 2 milisecond period // Increment Time milisec++; if(milisec == 256) halfsec = 1; if(milisec == 512) { halfsec = 0; // half second flag milisec = 0; // miliseconds time[0]++; if(time[0] == 10) { // seconds time[0] = 0; time[1]++; if(time[1] == 6) { time[1] = 0; time[2]++; if(time[2] == 10) { // minutes time[2] = 0; time[3]++; if(time[3] == 6) { time[3] = 0; time[4]++; if(time[4] == 10) { // hours time[4] = 0; time[5]++; } if((time[4] == 4) && (time[5] == 2)) { time[4] = 0; time[5] = 0; } } } } } } // Clear display (all digits off) POSITION0 = 0; POSITION1 = 0; POSITION2 = 0; POSITION3 = 0; POSITION4 = 0; POSITION5 = 0; // New digit to display // Test for blinking digit (and set it according "blink" variable) if((blink == position) && halfsec) { DIGIT0 = 1; DIGIT1 = 1; DIGIT2 = 1; DIGIT3 = 1; } else { // Set new digit to display auxdigit = tabledigit[*(p_digit + position)]; DIGIT0 = 0; DIGIT1 = 0; DIGIT2 = 0; DIGIT3 = 0; if(auxdigit & 0x1) DIGIT0 = 1; if(auxdigit & 0x2) DIGIT1 = 1; if(auxdigit & 0x4) DIGIT2 = 1; if(auxdigit & 0x8) DIGIT3 = 1; } // Switch ON new digit switch(position) { case 0: POSITION0 = 1; break; case 1: POSITION1 = 1; break; case 2: POSITION2 = 1; break; case 3: POSITION3 = 1; break; case 4: POSITION4 = 1; break; case 5: POSITION5 = 1; break; } // Test if pressed button with this position if((!button) && (KEYINP == 1)) button = position; // Update position for next digit position++; if(position == 6) position = 0; TMR1IF = 0; // Clear the interrupt flag } /* END */