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May 14, 2019 10:24
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ATmega88 @ 1MHz Tastenzustand 03
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/* tastenzustand_03.c ATmega88 @ 1MHz */ | |
#include <avr/io.h> | |
#include <util/delay.h> | |
#define button_down !(PIND & (1<<PD2)) // Taster an PD2 = low | |
#define led_on PORTB |= (1<<PB0) // PB0 = High | |
#define led_off PORTB &= ~(1<<PB0) // PB0 = Low | |
uint16_t ButtonCounter = 0; | |
int main(void) | |
{ | |
DDRB = 0xFF; // PORTB = Ausgang | |
DDRD = ~(1<<PD2); // PD2 = Eingang | |
while(1) | |
{ | |
if (button_down) // wenn Taster gedrückt | |
{ | |
for (uint8_t i=0; i<10; i++) // Schleife mit 10 Durchläufen | |
{ | |
_delay_us(1); // Prellzeit abwarten | |
if (button_down) // Wenn Taster noch immer gedrückt ist | |
asm ("NOP"); // nichts tun (Assembleranweisung NOP = No Operation) | |
else | |
i = 0; // setze i auf 0 zurück wenn ein High detektiert wurde | |
} | |
ButtonCounter = 0; // Button counter set to 0 | |
while (button_down) // So long as button pressed (PB2 = Int0) | |
{ | |
ButtonCounter ++; // increment Button counter | |
_delay_ms(1); | |
if (ButtonCounter >= 700) // if button pressed long | |
{ | |
led_off; | |
ButtonCounter --; // Button counter = 699 | |
} | |
} | |
if (ButtonCounter <= 698) // if button pressed short | |
{ | |
led_on; | |
ButtonCounter = 0; // Button counter set to 0 | |
} | |
} | |
} | |
} |
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