Commit c8a867ed authored by Erik Strand's avatar Erik Strand

Update code again

parent 5b492b15
......@@ -63,7 +63,6 @@ int main(void) {
// Activate button_pin's pullup resistor.
PORTA |= button_pin;
// Nothing left to do, so just spin.
while (1) {
// Turn on the LED when the button is pressed.
if (PINA & button_pin) {
......@@ -158,7 +157,6 @@ int main(void) {
int bouncy_switch_state = 0;
int debounced_switch_state = 0;
// Nothing left to do, so just spin.
while (1) {
// Use the timer to count how long it's been
// since button_pin changed state.
......
#include <avr/io.h>
#define switch_pin (1 << PA7)
#define led_pin (1 << PB2)
int main(void) {
// Set the clock prescaler to 1.
CLKPR = (1 << CLKPCE);
CLKPR = (0 << CLKPS3) | (0 << CLKPS2) | (0 << CLKPS1) | (0 << CLKPS0);
// Set the 8 bit timer's prescaler to 1/1024.
TCCR0B |= 0b00000101;
// Configure led_pin as an output.
DDRB |= led_pin;
// Configure switch_pin as an input.
DDRA |= switch_pin;
// Activate switch_pin's pullup resistor.
PORTA |= switch_pin;
//int count1 = 0;
//int count2 = 0;
int bouncy_switch_state = 0;
int debounced_switch_state = 0;
while (1) {
// Turn on the led when the button is pressed
/*
if (PINA & switch_pin) {
PORTB &= ~led_pin;
} else {
PORTB |= led_pin;
}
*/
// ~5s blink period based on counting
/*
if (++count1 == 255) {
if (++count2 == 255) {
PORTB ^= led_pin;
count1 = 0;
count2 = 0;
}
}
*/
// ~2.5s second blink period
// 255 * 200 * (1024 / 20M) = 2.6112
/*
if (TCNT0 >= 200) {
TCNT0 = 0;
if (++count1 == 255) {
PORTB ^= led_pin;
count1 = 0;
}
}
*/
// the button toggles the led (with debouncing)
if ((PINA & switch_pin) != bouncy_switch_state) {
bouncy_switch_state = PINA & switch_pin;
TCNT0 = 0;
}
if (TCNT0 >= 195) {
// It's been 10ms since the switch changed.
if (bouncy_switch_state != debounced_switch_state) {
debounced_switch_state = bouncy_switch_state;
if (debounced_switch_state == 0) {
PORTB ^= led_pin;
}
}
}
}
}
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