59 lines
1.2 KiB
C
59 lines
1.2 KiB
C
#include <avr/io.h>
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#include <avr/interrupt.h>
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#include "config.h"
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#include "led.h"
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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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LED_DIR |= 0x3F; // 0b00111111
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// Clear LEDs
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ANODES_PORT = HOUR_ANODE | MINUTE_ANODE | SECOND_ANODE;
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LED_PORT |= 0x3F; // 0b00111111
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TCCR0 |= (1<<CS00);
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TIMSK |= (1<<TOIE0);
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}
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// 8 MHz / 256 = 31.25 kHz
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ISR(TIMER0_OVF_vect)
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{
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static uint8_t pwm_counter = 0;
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static uint8_t counter = 0;
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static uint8_t curr_anode = 1;
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switch(curr_anode)
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{
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case 1:
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LED_PORT = ~led_hour;
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ANODES_PORT = ram_cfg.led_brightness >= pwm_counter ? ~HOUR_ANODE : 0xFF;
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break;
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case 2:
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LED_PORT = ~led_minute;
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ANODES_PORT = ram_cfg.led_brightness >= pwm_counter ? ~MINUTE_ANODE : 0xFF;
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break;
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case 4:
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LED_PORT = ~led_second;
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ANODES_PORT = ram_cfg.led_brightness >= pwm_counter ? ~SECOND_ANODE : 0xFF;
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break;
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}
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// 31.25 kHz / 250 = 125 Hz
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if(!counter)
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{
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curr_anode <<= 1;
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if(curr_anode > 4) curr_anode = 1;
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counter = 250;
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}
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--counter;
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++pwm_counter;
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} |