Working countdown

src/main.cpp

@@ -29,14 +29,19 @@ const uint8_t numbers[] = {
     (A | B | C | F | G)        // 9
 };
 
-bool decimalpoint[6] = {false, false, false, false, false, false};
+bool decimalpoint[6] = {true, false, true, false, true, false}; // Decimal points for each digit
 
 // Array to store digits to be displayed
-volatile uint8_t digits[] = {0, 0, 0, 0, 0, 0};
+volatile uint8_t digits[] = {0, 5, 9, 5, 9, 9}; // Initial countdown value: 59:59.9
 
 // Function to turn on a specific digit
 void turnOnDigit(uint8_t digit) {
-    decimalpoint[digit] ? PORTB |= DP : PORTB &= ~DP;
+    if (decimalpoint[digit]) {
+        PORTB |= DP;
+    } else {
+        PORTB &= ~DP;
+    }
+
     switch (digit) {
         case 0:
             PORTA |= (1<<PA1);
@@ -71,12 +76,44 @@ ISR(TIMER1_COMPA_vect) {
     currentDigit = (currentDigit + 1) % 6; // Move to the next digit
 }
 
+void updateDigits() {
+    if (digits[5] == 0) { // If milliseconds digit reaches 0
+        digits[5] = 9; // Reset milliseconds digit
+        if (digits[4] == 0) {
+            digits[4] = 9;
+            if (digits[3] == 0) {
+                digits[3] = 5;
+                if (digits[2] == 0) {
+                    digits[2] = 9;
+                    if (digits[1] == 0) {
+                        digits[1] = 5;
+                        if (digits[0] > 0) {
+                            digits[0]--;
+                        }
+                    } else {
+                        digits[1]--;
+                    }
+                } else {
+                    digits[2]--;
+                }
+            } else {
+                digits[3]--;
+            }
+        } else {
+            digits[4]--;
+        }
+    } else {
+        digits[5]--;
+    }
+}
+
 int main() {
     // Set PORTB as output for segments
     DDRB = 0xFF;
     // Set PORTA and PORTD as output for digit control
     DDRA |= (1<<PA0) | (1<<PA1);
     DDRD |= (1<<PD2) | (1<<PD3) | (1<<PD4) | (1<<PD5);
+    DDRD &= ~(1<<PD6);
 
     // Initialize Timer/Counter1 in CTC mode
     TCCR1B |= (1 << WGM12);
@@ -92,31 +129,20 @@ int main() {
     // Enable global interrupts
     sei();
 
-    uint8_t n = 0;
+    bool pd6_high = false; // Track the state of PD6
-    uint8_t d = 0;
     usart::printf("Started");
     while (1) {
-        char c =  usart::get();
+        if (PIND & (1<<PD6)) {
-        if(c == '\r') {
+            if (!pd6_high) { // If PD6 was previously low
-            usart::put('\n');
+                //usart::printf("PD6");
-            usart::put('\r');
+                updateDigits(); // Update digits every time PD6 goes high
-        } else {
+                pd6_high = true; // Set the state to high
-            usart::put(c);
-        }
-        if(c == 'n') {
-            n = 0;
-            d = 0;
-            for(int i = 0; i < 6; i++) {
-                digits[i] = 0;
-                decimalpoint[i] = false;
             }
+        } else {
+            pd6_high = false; // Reset the state to low when PD6 is low
         }
-        if(c == '.' && n > 0) {
+
-            decimalpoint[n-1] = true;
+        //_delay_us(10); // Add a delay to avoid rapid checking
-        }
-        if(c >= '0' && c <= '9' && n < 6) {
-            digits[n++] = c - '0';
-        }
     }
 
     return 0;