add DCF command

main.c

@@ -335,10 +335,24 @@ static void process_command(char* str)
 	// parse command
 	if (0==strcmp(word,"help")) {
 		printf("available commands:\n");
+		printf("DCF77 on|off\n");
 		printf("time [HH:MM:SS]\n");
 #if defined(EXTERNAL_RTC) && EXTERNAL_RTC
 		printf("date [YYYY-MM-DD]\n");
 #endif
+	} else if (0==strcmp(word,"DCF77")) {
+		word = strtok(NULL,delimiter);
+		if (!word) {
+			goto error;
+		} else if (0==strcmp(word,"on")) {
+			rtc_dcf77_on(); // switch DCF77 on
+			printf("DCF77 receiver switched on\n"); // notify user		
+		} else if (0==strcmp(word,"off")) {
+			rtc_dcf77_off(); // switch DCF77 off
+			printf("DCF77 receiver switched off\n"); // notify user
+		} else {
+			goto error;
+		}
 	} else if (0==strcmp(word,"time")) {
 		word = strtok(NULL,delimiter);
 		if (!word) {
@@ -438,9 +452,14 @@ int main(void)
 	rtc_interrupt_enable(RTC_SEC); // enable RTC interrupt on "seconds"
 	nvic_enable_irq(NVIC_RTC_IRQ); // allow the RTC to interrupt
 #endif
+	printf("OK\n");
+
+	// setup DCF77
+	printf("setup DCF77 receiver: ");
 	rtc_dcf77_setup(); // setup DCF77 module
-	rtc_dcf77_on(); // switch on DCF77 module to get correct time
 	printf("OK\n");
+	rtc_dcf77_on(); // switch DCF77 on to get correct time
+	printf("DCF77 receiver switched on\n"); // notify user
 
 	// setup WS2812B LEDs
 	printf("setup LEDs: ");	
@@ -565,6 +584,7 @@ int main(void)
 #endif
 				printf("DCF77 time: 20%02u-%02u-%02u %02u:%02u:00\n", dcf77_time[5], dcf77_time[4], dcf77_time[2], dcf77_time[1], dcf77_time[0]); // display time
 				rtc_dcf77_off(); // switch DCF77 off since we have correct time
+				printf("DCF77 receiver switched off\n"); // notify user
 			} else {
 				printf("DCF77 time: error\n");
 			}
@@ -589,8 +609,9 @@ int main(void)
 				printf("%02lu:%02lu:%02lu\n", ticks_time/ticks_hour, (ticks_time%ticks_hour)/ticks_minute, (ticks_time%ticks_minute)/ticks_second); // display external time
 			}
 			if ((ticks_time%ticks_hour)==0) { // one hours passed
-				rtc_dcf77_on(); // switch DCF77 on to update/correct time
 				clock_hours(); // show hour markers
+				rtc_dcf77_on(); // switch DCF77 on to update/correct time
+				printf("DCF77 receiver switched on\n"); // notify user
 			}
 			if (ticks_time>=ticks_midday*2) { // one day passed
 #if defined(EXTERNAL_RTC) && EXTERNAL_RTC