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  1. #include <avr/io.h>
  2. #include <avr/interrupt.h>
  3. #include <util/delay.h>
  4.  
  5. #include "lcd.h"
  6.  
  7. volatile uint32_t ovfs = 0;
  8.  
  9. ISR(TIMER1_OVF_vect) {
  10.   ++ovfs;
  11. }
  12.  
  13. int main(void) {
  14.   DDRB = 0xffu;
  15.   TIMSK1 |= 1<<TOIE1;
  16.   lcd_init(LCD_DISP_ON);
  17.   sei();
  18.   for (;;) {
  19.     uint32_t us = 0, cm = 0;
  20.     char buf[17] = {0}, tmp;
  21.     uint8_t i, j, len;
  22.     lcd_clrscr();
  23.     DDRD |= 1<<PD0;
  24.     PORTD &= ~(1<<PD0);
  25.     _delay_us(2);
  26.     PORTD |= 1<<PD0;
  27.     _delay_us(5);
  28.     PORTD &= ~(1<<PD0);
  29.     DDRD &= ~(1<<PD0);
  30.     while (!(PIND & (1<<PD0)));
  31.     TCNT1 = 0;
  32.     TCCR1B |= 1<<CS10;
  33.     while (PIND & (1<<PD0));
  34.     TCCR1B &= ~(1<<CS10);
  35.     us = TCNT1 + (65536lu * ovfs);
  36.     ovfs = 0;
  37.     cm = us * 17 / 100;
  38.     for (i = 0; i < 12 && (cm != 0 || i == 0 || i == 1); ++i) {
  39.       buf[i] = cm % 10 + '0';
  40.       cm /= 10;
  41.     }
  42.     len = j = i;
  43.     for (--j, i = 0; i < j; ++i, --j) {
  44.       tmp = buf[i];
  45.       buf[i] = buf[j];
  46.       buf[j] = tmp;
  47.     }
  48.     i = len;
  49.     tmp = buf[--i];
  50.     buf[i++] = '.';
  51.     buf[i++] = tmp;
  52.     buf[i++] = ' ';
  53.     buf[i++] = 'c';
  54.     buf[i++] = 'm';
  55.     lcd_puts(buf);
  56.     _delay_ms(1000);
  57.   }
  58.   return 0;
  59. }
  60.  
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https://ideone.com/UI8Hz9
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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