use LED_C gps signal indicator

code/src/main.c

@@ -219,7 +219,6 @@ void set_PWM_duty(int dutycycle){
 ISR (TIMER1_OVF_vect)    // Timer1 ISR
 {
 	//PORTD ^=TUBE_LED;
-	PORTB ^=STATUS_LED_C;
 	TCNT1 = 63974; //63974;   // for 1 sec at 16 MHz
 	animationtimer ++;
 	if(animationtimer > 10){
@@ -260,11 +259,14 @@ ISR(USART0_RX_vect)
     else if(async_buffer_pointer > 0){
         async_input_buffer[async_buffer_pointer] = 0; // Null terminate string
         async_buffer_pointer=0;
-        PORTB ^=STATUS_LED_C;
-        uint8_t test[3];
-        if(!parse_nmea_gps(async_input_buffer, test)){
-            printf("parse: %x %x %x\n\r", test[2], test[1], test[0]); 
-            DS3231_write(test);
+        uint8_t bcd_time[3];
+
+        /* write to RTC if time is valid */
+        if(!parse_nmea_gps(async_input_buffer, bcd_time)){
+            DS3231_write(bcd_time);
+            PORTB |= STATUS_LED_C;
+        } else {
+            PORTB &= ~STATUS_LED_C;
         }
     }
 }