AVR+7 szegmenses kijelzo

[Pal Lukacs]

Pal Lukacs <ekegep at yahoo.com> wrote: 
 
 Kozben en is dolgoztam a 7szegmenses meghajtason.az avr-progin,de meg nincs kesz a z elekotrnika hozza...
 Namost az lenne a kerdesem hogy ha idoosztasos modszerrel 20ms -kent multiplexelek,akkor az 100 HZ-re jon ki?
 
 Idezem az eddigi forraskodot..Jelzem meg nincs befejezve korant sincs..
 
 
 #include <inttypes.h>
 #include <util/delay.h>
 #include <avr/pgmspace.h>
 #include <avr/interrupt.h>
 //#include <avr/eeprom.h>
 
 #define DISPLY_MPLEX_CTLR_DDR DDRD
 #define DISPLY_MPLEX_CTLR PORTD
 
 #define DISPLY_PORT_DDR DDRC
 #define DISPLY_PORT PORTC
 
 #define SEG_a 0x01
 #define SEG_b 0x02
 #define SEG_c 0x04
 #define SEG_d 0x08
 #define SEG_e 0x10
 #define SEG_f 0x20
 #define SEG_g 0x40
 #define SEG_dot 0x80
 
 //10ms & 2sec thersholds 
 #define CNT1_THRESHOLD      20
 #define CNT2_THRESHOLD    4000
 
 volatile unsigned int cnt1, cnt2;
 unsigned char flag1 = 1;
 unsigned char mplex_data = 1;
 signed int temperature;
 unsigned char disply_data;
 
 unsigned char digits[] PROGMEM = {
   (SEG_a | SEG_b | SEG_c | SEG_d | SEG_e | SEG_f),    // 0
   (SEG_b | SEG_c),        // 1
   (SEG_a | SEG_b | SEG_d | SEG_e | SEG_g),    // 2
   (SEG_a | SEG_b | SEG_c | SEG_d | SEG_g),    // 3
   (SEG_b | SEG_c | SEG_c | SEG_f | SEG_g),    // 4
   (SEG_a | SEG_c | SEG_d | SEG_f | SEG_g),    // 5
   (SEG_a | SEG_c | SEG_d | SEG_e | SEG_f | SEG_g),    // 6
   (SEG_a | SEG_b | SEG_c),    // 7
   (SEG_a | SEG_b | SEG_c | SEG_d | SEG_e | SEG_f | SEG_g),    // 8
   (SEG_a | SEG_b | SEG_c |  SEG_d | SEG_f | SEG_g),    // 9
   (SEG_g),            // -
   (SEG_a)
 };
 
 
 unsigned char
 seg7 (uint8_t _digit)
 {
   return pgm_read_byte_near (&digits[_digit]);
 }
 
 
 //timer2 : 256 (4 000 000 / 8) = 0,000512 --ovf.time-- * 20 = 0,01024 (=~10msec)
 //0,000512 * 4000 = 2,048 sec
 
 //atirni..
 void
 timer2_init ()
 {
   //ovf.int time = timer counter max / (fosc/prescaler) 
   //TIMSK |= (1 << TOIE1);    //timer1 ovf. bekapcsolva
   sei ();            //global int. enable
 }
 
 /* idoosztas ...*/
 SIGNAL (SIG_OVERFLOW1)
 {
   {
     cnt1++;
     cnt2++;
   }
 }
 
 /*
 disp1 = temperature/10;
 disp2 = temperature%10; 
 */
 int
 main ()
 {
    timer2_init ();
   //i2c init...
 
   /*ports init */
   //..........
 
   for (;;)
     {
       //2sec.onkent
       if (cnt2 == CNT2_THRESHOLD)
     {
       //olvasas DS1621 -rol 
       //homerseklet szamitas ---> temperature
     }
     
     
       //10ms -onkent multiplex control
       if (cnt1 == CNT1_THRESHOLD)
     {
       if (flag1)
         {
           if (mplex_data >= 2)
         {
           mplex_data = 1;
         }
            //disp1 bekapcsolva,az adat neki megy
           DISPLY_MPLEX_CTLR = mplex_data;    //00000001
           if (temperature < 0)
         disply_data = seg7 (10);    //-
           else if (temperature > 99)
         disply_data = seg7 (11);
           else
         disply_data = seg7 (temperature / 10);    //pl: 17C /10 = 1,7--> 1
           DISPLY_PORT = disply_data;
           flag1 = 0;    //idokeres kikapcsolva
           cnt1 = 0;
         }
        else
         {
           //disp2-re atkapcsolva(disp1 ki),az adat neki megy
           DISPLY_MPLEX_CTLR = mplex_data * 2;    //00000010
           if (temperature < 0)
         disply_data = seg7 (10);    //-
           else if (temperature > 99)
         disply_data = seg7 (11);
           else
         disply_data = seg7 (temperature % 10);    //pl: 17C %10 = 1,7--> 7
           DISPLY_PORT = disply_data;
           flag1 = 1;
            cnt1 = 0;
         }
     }
     }
   return 0;
 }
 
     

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