81 lines
1.7 KiB
C
81 lines
1.7 KiB
C
/*
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* counter_t2_interrupt.c
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*
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* Created: 21/02/2021 13:00:25
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* Author : Etienne
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*/
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#define F_CPU 8e6
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#include <stdlib.h>
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#include <stdio.h>
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#include <avr/io.h>
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#include <util/delay.h>
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#include <avr/interrupt.h>
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#include "lcd_control.h"
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#define BIT(x) (1 << (x))
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// wait(): busy waiting for 'ms' millisecond
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// Used library: util/delay.h
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void wait( int ms ) {
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for (int tms=0; tms<ms; tms++) {
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_delay_ms( 1 ); // library function (max 30 ms at 8MHz)
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}
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}
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char * toArray(int number)
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{
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int n = log10(number) + 1;
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int i;
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char *numberArray = calloc(n, sizeof(char));
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for (i = n-1; i >= 0; --i, number /= 10)
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{
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numberArray[i] = (number % 10) + '0';
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}
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return numberArray;
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}
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int TimerPreset = -1; // 0xF6, 10 till overflow
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int number = 0;
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// Interrupt routine timer2 overflow
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ISR( TIMER2_OVF_vect ) {
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TCNT2 = TimerPreset; // Preset value
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number++; // Increment counter
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lcd_clear();
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int length = snprintf(NULL, 0, "%d", number + 1);
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char str[length + 1];
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snprintf(str, length + 1, "%d", number + 1);
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lcd_write_string(str);
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}
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// Initialize timer2
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void timer2Init( void ) {
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TCNT2 = TimerPreset; // Preset value of counter 2
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TIMSK |= BIT(6); // T2 overflow interrupt enable
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sei(); // turn_on intr all
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TCCR2 = 0x07; // Initialize T2: ext.counting, rising edge, run
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}
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int main(void) {
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DDRD &= ~BIT(7); // PD7 op input: DDRD=xxxx xxx0
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DDRA = 0xFF; // set PORTA for output (shows countregister)
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DDRB = 0xFF; // set PORTB for output (shows tenthvalue)
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init_4bits_mode();
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_delay_ms(10);
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lcd_clear();
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lcd_write_string("yeet");
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timer2Init();
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while (1) {
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PORTA = TCNT2; // show value counter 2
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PORTB = number; // show value tenth counter
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wait(10);
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}
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} |