60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
#include <avr/io.h>
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#include <stdbool.h>
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#include <util/delay.h>
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#include <math.h>
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#include "util.h"
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#include "7segment.h"
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uint8_t display[4] = { 0, 0, 0, 0 };
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uint8_t current_digit = 0;
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void display_value(uint8_t digit, uint8_t data) {
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// The left part sets the last 4 bits high (turns the
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// according digit off) except for the one we want to address.
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// The right part makes sure the first 4 bits remain unchanged.
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PORTK = (0b00001111 & ~(1 << digit)) | (PORTK & 0b11110000);
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PORTF = data;
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}
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void set_display_value(uint8_t digit, uint8_t data) {
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display[digit] = data;
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}
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void update_next_digit() {
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update_display_digit(current_digit++);
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if (current_digit >= 4) current_digit = 0;
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}
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void update_display_digit(int digit) {
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display_value(digit, display[digit]);
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}
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// Returns the amount of microseconds we blocked for
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float update_display_all_sync() {
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int sleep_time = 2000;
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for (int i = 0; i < 4; i++) {
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display_value(i, display[i]);
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_delay_us(sleep_time);
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}
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return sleep_time * 4;
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}
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void show_float(float value) {
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if (value >= 10000 || value < 0) {
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for (int i = 0; i < 4; i++) {
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set_display_value(i, 0b01000000); // minus character
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}
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return;
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}
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int digits = num_digits((int)value);
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int full_number = value * (int)roundf(powf(10, 4 - digits));
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for (int i = 0; i < 4; i++) {
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bool show_period = digits == i + 1;
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int digit = get_digit_at_position(full_number, 3 - i);
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set_display_value(i, digit_to_binary(show_period, digit));
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}
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}
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