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116 lines
2.5 KiB
116 lines
2.5 KiB
#include <avr/io.h>
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#include <avr/pgmspace.h>
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#include <avr/eeprom.h>
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#include <util/delay.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include "utils.h"
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/**
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* +--u--+
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* RST --| |-- Vcc
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* SAVE LED : PB3 --| t13 |-- PB2 : BTN: HIGH
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* N.C. : PB4 --| |-- PB1 : BTN: LOW
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* GND --| |-- PB0 : LED
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* +-----+
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*/
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// pins config
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#define PIN_LED PB0
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#define PIN_LOW PB1
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#define PIN_HIGH PB2
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#define PIN_INDICATOR PB3
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#define btn_low() (0 == get_bit(PINB, PIN_LOW))
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#define btn_high() (0 == get_bit(PINB, PIN_HIGH))
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/** Initialize IO ports. */
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void SECTION(".init8") init_io(void)
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{
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// set pin directions
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DDRB = _BV(PIN_LED) | _BV(PIN_INDICATOR);
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// pullups
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PORTB = _BV(PIN_LOW) | _BV(PIN_HIGH);
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// initialize the timer
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// Fast PWM mode, Output to OC0A
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OCR0A = 32;
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TCCR0A = _BV(WGM00) | _BV(WGM01) | _BV(COM0A1);
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TCCR0B = _BV(CS00);
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}
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#define BRIGHTNESS_LEN 121
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const uint8_t BRIGHTNESS[] PROGMEM = {
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0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 4, 4, 4, 4, 5, 5,
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6, 6, 6, 7, 7, 8, 8, 8, 9, 10, 10, 10, 11, 12, 13, 14, 14,
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15, 16, 17, 18, 20, 21, 22, 24, 26, 27, 28, 30, 31, 32, 34,
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35, 36, 38, 39, 40, 41, 42, 44, 45, 46, 48, 49, 50, 52, 54,
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56, 58, 59, 61, 63, 65, 67, 69, 71, 72, 74, 76, 78, 80, 82,
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85, 88, 90, 92, 95, 98, 100, 103, 106, 109, 112, 116, 119,
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122, 125, 129, 134, 138, 142, 147, 151, 156, 160, 165, 170,
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175, 180, 185, 190, 195, 200, 207, 214, 221, 228, 234, 241,
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248, 255
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};
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#define apply_brightness(level) OCR0A = pgm_read_byte( & BRIGHTNESS[level] )
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/**
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* Main function
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*/
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void main()
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{
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bool changed = 0;
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bool changed_since_last_save = 0;
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uint8_t savetimer = 0;
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uint8_t level = eeprom_read_byte((uint8_t *) 0);
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if (level >= BRIGHTNESS_LEN)
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level = BRIGHTNESS_LEN - 1;
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else if (level == 0)
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level = BRIGHTNESS_LEN / 2;
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apply_brightness(level);
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while (1) {
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if (btn_high() && level < BRIGHTNESS_LEN - 1) {
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level++;
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changed = 1;
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}
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if (btn_low() && level > 1) {
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level--;
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changed = 1;
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}
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if (changed) {
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changed = 0;
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savetimer = 0;
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changed_since_last_save = 1;
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apply_brightness(level);
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}
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_delay_ms(20);
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savetimer++;
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if (savetimer >= 50 && changed_since_last_save) {
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changed_since_last_save = 0;
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savetimer = 0;
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sbi(PORTB, PIN_INDICATOR);
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eeprom_update_byte((uint8_t*) 0, level);
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_delay_ms(10);
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cbi(PORTB, PIN_INDICATOR);
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}
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}
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}
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