nmea_parse_checksum: Calculate checksum metrics

In paleolimbot/nmea: Parse 'NMEA' Sentences

Description

Calculate checksum metrics

Usage

nmea_parse_checksum(x)

Arguments

x	An nmea() object.

Value

A tibble::tibble() with columns

• calc: integer representation of the calculated checksum. This is never NA.

• found: integer representation of the checksum embedded in the NMEA sentence or NA if the sentence did not contain a checksum or contained one composed of invalid hex characters.

• start: The zero-based index of the first character used to calculate the checksum or NA if the starting character "$" was not found.

• end: The last character used to calculate the checksum such that end - start is the number of characters used. NA if the checksum character "*" was never found.

Both start and end are intended to be the values needed to pass to nmea_sub() to extract the non-checksum components.

Examples

nmea_parse_checksum(nmea_test_basic)

# partial results for invalid nmea
nmea_parse_checksum("$GPGSA,A,1,,,")

paleolimbot/nmea documentation built on April 12, 2021, 2:10 a.m.