application: display uptime

application.c

@@ -519,6 +519,12 @@ void main(void)
 				sensor_ds18b20_convert(0); // start next conversion
 				printf("heater temperature: %.01f °C\n", heater_temp);
 			}
+			// update uptime
+			const uint32_t uptime = rtc_to_seconds() - boot_time; // get time from internal RTC
+			char strtime[12]; // to store time representation
+			snprintf(strtime, sizeof(strtime), "%u.%02u:%02u:%02u", uptime / (24 * 60 * 60), (uptime / (60 * 60)) % 24, (uptime / 60) % 60, uptime % 60); // get uptime representation
+			oled_text_line(strtime, 1); // add text to display buffer
+			oled_text_update(); // display new text
 		}
 		if (sensor_sr04_distance) { // distance measurement is available
 			printf("distance: %u mm\n", sensor_sr04_distance); // start measurement