91 lines
1.9 KiB
C++
91 lines
1.9 KiB
C++
const unsigned int scan[] = {5, 6, 7, 8};
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const unsigned int LED[] = {9, 13, 2, 3};
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const unsigned int BUTTON[] = {A0, A1};
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#define DATA 10
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#define LATCH 11
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#define CLK 12
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void setup() {
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for (int i = 0; i < 4; i++) {
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pinMode(scan[i], OUTPUT);
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digitalWrite(scan[i], HIGH);
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}
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for (int i = 0; i < 4; i++) {
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pinMode(LED[i], OUTPUT);
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digitalWrite(LED[i], HIGH);
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}
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for (int i = 0; i < 2; i++) {
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pinMode(BUTTON[i], INPUT);
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}
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pinMode(DATA, OUTPUT);
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pinMode(LATCH, OUTPUT);
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pinMode(CLK, OUTPUT);
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}
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int get_mode() {
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static int last = 0;
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for (int i = 0; i < 2; i++) {
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if (!digitalRead(BUTTON[i])) {
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last = i+1;
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return last;
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}
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}
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return last;
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}
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void show(byte digits[4]) {
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for (int i = 0; i < 4; i++) {
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digitalWrite(LATCH, LOW);
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shiftOut(DATA, CLK, MSBFIRST, ~digits[i]); // 低態觸發
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digitalWrite(LATCH, HIGH);
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digitalWrite(scan[3 - i], LOW); // 點亮一毫秒
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delay(1);
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digitalWrite(scan[3 - i], HIGH);
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}
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}
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void mode_display() {
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static byte digits[4]; // 所有數字的狀態
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static byte p = 0; // 現在要改變的數字
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static unsigned long checkpoint = 0;
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show(digits);
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if (millis() - checkpoint > 200) {
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if (p == 4) {
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// 所有 LED 皆點亮，重設所有值
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p = 0;
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for (int i = 0; i < 4; i++) digits[i] = 0;
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}
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digits[p] <<= 1; // 向左移位
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digits[p] += 1; // 補一
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if (digits[p] == 0xFF) {
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// if current digit is full, change to the next one
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p++;
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}
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checkpoint = millis();
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}
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}
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void mode_led() {
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static unsigned long checkpoint;
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static int c = 0;
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if (millis() - checkpoint > 200) {
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for (int i = 0; i < 4; i++) {
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digitalWrite(LED[i], i != c%4);
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}
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c++;
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checkpoint = millis();
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}
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}
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void loop() {
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switch (get_mode()) {
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case 1:
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mode_display();
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break;
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case 2:
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mode_led();
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break;
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}
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}
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