blackbox

const (
	// See https://cleanflight.readthedocs.io/en/stable/development/Blackbox%20Internals/
	LogFrameEvent  LogFrameType = 69 // E
	LogFrameIntra               = 73 // I
	LogFrameInter               = 80 // P
	LogFrameSlow                = 83 // S
	LogFrameHeader              = 72 // H
	LogFrameGPS                 = 71 // G
)

const (
	LogEventSyncBeep           LogEventType = 0
	LogEventInflightAdjustment              = 13
	LogEventLoggingResume                   = 14
	LogEventFlightMode                      = 30
	LogEventLogEnd                          = 255
)

const (
	// EncodingSignedVB is for signed variable-byte
	EncodingSignedVB = 0

	// EncodingUnsignedVB is for Unsigned variable-byte
	EncodingUnsignedVB = 1

	// EncodingNeg14Bits is for Unsigned variable-byte but we negate the value before storing value is 14 bits
	EncodingNeg14Bits = 3

	// EncodingTag8_8SVB is for First, an 8-bit (one byte) header is written. This header has its bits set to zero when the corresponding field (from a maximum of 8 fields) is set to zero, otherwise the bit is set to one.
	EncodingTag8_8SVB = 6

	// EncodingTag2_3S32 is for a 2-bit header is written, followed by 3 signed field values of up to 32 bits each.
	EncodingTag2_3S32 = 7

	// EncodingTag8_4S16 is for an 8-bit header is written, followed by 4 signed field values of up to 16 bits each.
	EncodingTag8_4S16 = 8

	// EncodingNull is for nothing is written to the file take value to be zero
	EncodingNull = 9
)

const (
	// PredictorZero returns the value unmodified
	PredictorZero = 0

	// PredictorPrevious return the value substracted from the interframe
	PredictorPrevious = 1

	// PredictorStraightLine assumes that the slope between the current measurement and the previous one will be similar to the slope between the previous measurement and the one before that.
	// This is common for fields which increase at a steady rate, such as the "time" field. The predictor is `history_age_2 - 2 * history_age_1`.
	PredictorStraightLine = 2

	// PredicatorAverage2 is the average of the two previously logged values of the field (i.e. `(history_age_1 + history_age_2) / 2`).
	// It is used when there is significant random noise involved in the field, which means that the average of the recent history is a better predictor of the next value than the previous value on its own would be (for example, in gyroscope or motor measurements).
	PredicatorAverage2 = 3

	// PredictorMinThrottle subtracts the value of "minthrottle" which is included in the log header.
	// In Cleanflight, motors always lie in the range of `[minthrottle ... maxthrottle]` when the craft is armed, so this predictor is used for the first motor value in intraframes.
	PredictorMinThrottle = 4

	// PredictorMotor0 is set to the value of `motor[0]` which was decoded earlier within the current frame.
	// It is used in intraframes for every motor after the first one, because the motor commands typically lie in a tight grouping.
	PredictorMotor0 = 5

	// PredictorInc assumes that the field will be incremented by 1 unit for every main loop iteration. This is used to predict the `loopIteration` field, which increases by 1 for every loop iteration.
	PredictorInc = 6

	// Predictor1500 is set to a fixed value of 1500.
	// It is preferred for logging servo values in intraframes, since these  typically lie close to the midpoint of 1500us.
	Predictor1500 = 8

	// PredictorVbatRef is set to the "vbatref" field written in the log header.
	// It is used when logging intraframe battery voltages in Cleanflight, since these are expected to be broadly similar to the first battery voltage seen during arming.
	PredictorVbatRef = 9

	// PredictorMinMotor returns the value and the minimum motor low output summed
	PredictorMinMotor = 11
)