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