/* required functions from the underlying log system */
+#define AO_LOG_FORMAT_UNKNOWN 0 /* unknown; altosui will have to guess */
+#define AO_LOG_FORMAT_FULL 1 /* 8 byte typed log records */
+#define AO_LOG_FORMAT_TINY 2 /* two byte state/baro records */
+#define AO_LOG_FORMAT_TELEMETRY 3 /* 32 byte ao_telemetry records */
+#define AO_LOG_FORMAT_TELESCIENCE 4 /* 32 byte typed telescience records */
+#define AO_LOG_FORMAT_NONE 127 /* No log at all */
+
+extern __code uint8_t ao_log_format;
+
/* Return the flight number from the given log slot, 0 if none */
uint16_t
ao_log_flight(uint8_t slot);