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66 lines
1.3 KiB
66 lines
1.3 KiB
//
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// Created by MightyPork on 2017/06/08.
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//
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#include <stdint.h>
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#include <iopins.h>
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#include <spi.h>
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#include <avr/interrupt.h>
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#include <adc.h>
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#include "pinout.h"
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#include "display.h"
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const uint8_t disp_digits[10] = {
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DIGIT_0, DIGIT_1, DIGIT_2, DIGIT_3, DIGIT_4, DIGIT_5, DIGIT_6, DIGIT_7, DIGIT_8, DIGIT_9
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};
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volatile uint8_t disp_brightness;
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void display_show(uint8_t dig0, uint8_t dig1)
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{
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spi_send(0);
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spi_send(0);
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spi_send(dig1);
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spi_send(dig0);
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pin_down(PIN_DISP_STR);
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pin_up(PIN_DISP_STR);
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}
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void display_show_number(uint8_t num)
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{
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uint8_t tens = num / 10;
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uint8_t ones = num - tens * 10;
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uint8_t dig0 = tens ? disp_digits[tens] : 0;
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uint8_t dig1 = disp_digits[ones];
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dig1 |= SEG_H;
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display_show(dig0, dig1);
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}
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// --- LED display brightness control ---
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/**
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* PWM for LED display dimming
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*/
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void setup_pwm(void)
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{
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OCR2B = disp_brightness = 0xFF;
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TCCR2A |= _BV(WGM20) | _BV(WGM21) | _BV(COM2B1);
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TIMSK2 |= _BV(TOIE2); // enable ISR
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TCCR2B |= _BV(CS20);
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adc_start_conversion(LIGHT_ADC_CHANNEL);
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}
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/** ISR that writes the PWM register - to avoid glitches */
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ISR(TIMER2_OVF_vect)
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{
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// convert in background
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if (adc_ready()) {
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disp_brightness = 255 - adc_read_8bit(); // inverse
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if (disp_brightness < 10) disp_brightness = 10;
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adc_start_conversion(LIGHT_ADC_CHANNEL);
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}
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OCR2B = disp_brightness;
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}
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