#include <NMEA_data.h>

Public Attributes
int16_t *	data = NULL
	array of ints, oldest first

unsigned	n = 0
	number of history array elements

uint32_t	lastHistory = 0
	millis() when history was last updated

uint16_t	historyInterval = 20
	seconds between history updates

nmea_float_t	scale = 1.0
	history = (smoothed - offset) * scale

nmea_float_t	offset = 0.0
	value = (float) history / scale + offset

Detailed Description

Struct to contain all the details associated with the history of an NMEA data value as an optional extension to the data value struct. The history is stored as scaled integers to save space while caputuring a reasonable level of resolution. The integer is set equal to scale * (X - offset) and can be converted back to an approximate float value with X = I / scale + offset

Only some tags have history in order to save memory. Most of the memory cost is directly in the array.

192 history values taken every 20 seconds covers just over an hour.

The documentation for this struct was generated from the following file:

src/NMEA_data.h

Public Attributes

Detailed Description