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  1. #include <avr/io.h>
  2. #include <avr/sleep.h>
  3. #include <util/delay.h>
  4.  
  5. #include "lcd.h"
  6.  
  7. int main(void) {
  8.   DDRB = 0xffu;
  9.   set_sleep_mode(SLEEP_MODE_IDLE);
  10.   lcd_init(LCD_DISP_ON);
  11.   for (;;) {
  12.     uint32_t us = 0;
  13.     uint8_t cm = 0;
  14.     char buf[17] = {0};
  15.     uint8_t i, j, len;
  16.     lcd_clrscr();
  17.     DDRD |= 1<<PD0;
  18.     PORTD &= ~(1<<PD0);
  19.     _delay_us(2);
  20.     PORTD |= 1<<PD0;
  21.     _delay_us(5);
  22.     PORTD &= ~(1<<PD0);
  23.     DDRD &= ~(1<<PD0);
  24.     while (!(PIND & (1<<PD0)));
  25.     while (PIND & (1<<PD0)) {
  26.       us += 6;
  27.     }
  28.     cm = us / 29 / 2;
  29.     for (i = 0; i < 13 && (cm || i == 0); ++i) {
  30.       buf[i] = cm % 10 + '0';
  31.       cm /= 10;
  32.     }
  33.     len = j = i;
  34.     for (--j, i = 0; i < j; ++i, --j) {
  35.       char tmp;
  36.       tmp = buf[i];
  37.       buf[i] = buf[j];
  38.       buf[j] = tmp;
  39.     }
  40.     i = len;
  41.     buf[i++] = ' ';
  42.     buf[i++] = 'c';
  43.     buf[i++] = 'm';
  44.     lcd_puts(buf);
  45.     _delay_ms(1000);
  46.   }
  47.   return 0;
  48. }
  49.  
Not running #stdin #stdout 0s 0KB
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https://ideone.com/ByR6cX
language:
C99 (gcc 8.3)
created:
10 years ago
visibility:
public

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