77 lines
1.8 KiB
C
77 lines
1.8 KiB
C
#include <avr/io.h>
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#include <avr/interrupt.h>
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#include "led.h"
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#define SET_LED(PORT, IDX, NUM) PORT = ((PORT & ~(1<<(IDX))) | (~(NUM) & 1<<(IDX)))
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volatile uint8_t led_hour;
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volatile uint8_t led_minute;
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volatile uint8_t led_second;
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void led_init(void)
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{
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// Set outputs
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ANODES_DIR |= HOUR_ANODE | MINUTE_ANODE | SECOND_ANODE;
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LED0_DIR |= LED0;
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LED1_DIR |= LED1;
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LED2_DIR |= LED2;
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LED3_DIR |= LED3;
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LED4_DIR |= LED4;
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LED5_DIR |= LED5;
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// Clear LEDs
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ANODES_PORT = HOUR_ANODE | MINUTE_ANODE | SECOND_ANODE;
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LED0_PORT |= LED0;
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LED1_PORT |= LED1;
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LED2_PORT |= LED2;
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LED3_PORT |= LED3;
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LED4_PORT |= LED4;
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LED5_PORT |= LED5;
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TCCR0 |= (1<<WGM01); // CTC Mode
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TCCR0 |= (1<<CS02) | (1<<CS00); // Prescaler 1024
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OCR0 = 38; // 200Hz
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TIMSK |= (1<<OCIE0); // Enable CTC interruptions
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}
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ISR(TIMER0_COMP_vect)
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{
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static uint8_t counter = 1;
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switch(counter) {
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case 1:
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ANODES_PORT = ~HOUR_ANODE;
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SET_LED(LED0_PORT, 0, led_hour);
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SET_LED(LED1_PORT, 1, led_hour);
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SET_LED(LED2_PORT, 2, led_hour);
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SET_LED(LED3_PORT, 3, led_hour);
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SET_LED(LED4_PORT, 4, led_hour);
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SET_LED(LED5_PORT, 5, led_hour);
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break;
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case 2:
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ANODES_PORT = ~MINUTE_ANODE;
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SET_LED(LED0_PORT, 0, led_minute);
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SET_LED(LED1_PORT, 1, led_minute);
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SET_LED(LED2_PORT, 2, led_minute);
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SET_LED(LED3_PORT, 3, led_minute);
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SET_LED(LED4_PORT, 4, led_minute);
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SET_LED(LED5_PORT, 5, led_minute);
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break;
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case 4:
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ANODES_PORT = ~SECOND_ANODE;
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SET_LED(LED0_PORT, 0, led_second);
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SET_LED(LED1_PORT, 1, led_second);
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SET_LED(LED2_PORT, 2, led_second);
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SET_LED(LED3_PORT, 3, led_second);
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SET_LED(LED4_PORT, 4, led_second);
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SET_LED(LED5_PORT, 5, led_second);
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break;
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}
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counter <<= 1;
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if(counter > 4)
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{
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counter = 1;
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}
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} |