On9 NMEA

Dumb & tiny state machine based NMEA parser

"On 9" is an informal abbreviation of "戆鸠" in Cantonese, which means "dumb"

This library does NOT have any C standard library used. Only size_t and uintXX_t types used.

Currently, this library only supports RMC and GGA sentences.

Usage

0. Copy on9nmea.c and on9nmea.h to your project, or clone this repo as a submodule
1. Initialise the context by on9_nmea_init()
2. Call on9_nmea_feed_char() till it returns ON9_NMEA_STATE_DONE or ON9_NMEA_STATE_ERROR_*

Size

As of commit 99b8ee66eabf6, compiled with ESP-IDF v5.1.2 + esp-12.2.0_20230208 toolchain for ESP32-S3 in -Os:

• .text
  • 1119 bytes
• .rodata
  • 44 bytes

License

MIT or Apache-2.0