move minmea to component

This commit is contained in:
Christopher Liebman 2018-01-27 15:21:34 -08:00
parent 7f390ea990
commit 84601b8843
7 changed files with 9 additions and 920 deletions

3
.gitmodules vendored
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[submodule "components/u8g2"] [submodule "components/u8g2"]
path = components/u8g2 path = components/u8g2
url = git@github.com:liebman/u8g2 url = git@github.com:liebman/u8g2
[submodule "components/minmea/minmea"]
path = components/minmea/minmea
url = https://github.com/kosma/minmea.git

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COMPONENT_OBJS := minmea/minmea.o
COMPONENT_SRCDIRS := minmea
COMPONENT_ADD_INCLUDEDIRS := minmea
CPPFLAGS += -Dtimegm=mktime

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Subproject commit cd27e72970cd50b46e9c95c1c0076a49c1ceaf33

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Subproject commit 6bcf57f2ae2d604e4954ea776d1eef1c0f3aed5e Subproject commit ea7dbc407cd68419322da57cdbdfc00521c86458

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DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
Version 2, December 2004
Copyright (C) 2004 Sam Hocevar <sam@hocevar.net>
Everyone is permitted to copy and distribute verbatim or modified
copies of this license document, and changing it is allowed as long
as the name is changed.
DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. You just DO WHAT THE FUCK YOU WANT TO.

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/*
* Copyright © 2014 Kosma Moczek <kosma@cloudyourcar.com>
* This program is free software. It comes without any warranty, to the extent
* permitted by applicable law. You can redistribute it and/or modify it under
* the terms of the Do What The Fuck You Want To Public License, Version 2, as
* published by Sam Hocevar. See the COPYING file for more details.
*/
#include "minmea.h"
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <stdarg.h>
#include <time.h>
#define boolstr(s) ((s) ? "true" : "false")
static int hex2int(char c)
{
if (c >= '0' && c <= '9')
return c - '0';
if (c >= 'A' && c <= 'F')
return c - 'A' + 10;
if (c >= 'a' && c <= 'f')
return c - 'a' + 10;
return -1;
}
uint8_t minmea_checksum(const char *sentence)
{
// Support senteces with or without the starting dollar sign.
if (*sentence == '$')
sentence++;
uint8_t checksum = 0x00;
// The optional checksum is an XOR of all bytes between "$" and "*".
while (*sentence && *sentence != '*')
checksum ^= *sentence++;
return checksum;
}
bool minmea_check(const char *sentence, bool strict)
{
uint8_t checksum = 0x00;
// Sequence length is limited.
if (strlen(sentence) > MINMEA_MAX_LENGTH + 3)
return false;
// A valid sentence starts with "$".
if (*sentence++ != '$')
return false;
// The optional checksum is an XOR of all bytes between "$" and "*".
while (*sentence && *sentence != '*' && isprint((unsigned char) *sentence))
checksum ^= *sentence++;
// If checksum is present...
if (*sentence == '*') {
// Extract checksum.
sentence++;
int upper = hex2int(*sentence++);
if (upper == -1)
return false;
int lower = hex2int(*sentence++);
if (lower == -1)
return false;
int expected = upper << 4 | lower;
// Check for checksum mismatch.
if (checksum != expected)
return false;
} else if (strict) {
// Discard non-checksummed frames in strict mode.
return false;
}
// The only stuff allowed at this point is a newline.
if (*sentence && strcmp(sentence, "\n") && strcmp(sentence, "\r\n"))
return false;
return true;
}
static inline bool minmea_isfield(char c) {
return isprint((unsigned char) c) && c != ',' && c != '*';
}
bool minmea_scan(const char *sentence, const char *format, ...)
{
bool result = false;
bool optional = false;
va_list ap;
va_start(ap, format);
const char *field = sentence;
#define next_field() \
do { \
/* Progress to the next field. */ \
while (minmea_isfield(*sentence)) \
sentence++; \
/* Make sure there is a field there. */ \
if (*sentence == ',') { \
sentence++; \
field = sentence; \
} else { \
field = NULL; \
} \
} while (0)
while (*format) {
char type = *format++;
if (type == ';') {
// All further fields are optional.
optional = true;
continue;
}
if (!field && !optional) {
// Field requested but we ran out if input. Bail out.
goto parse_error;
}
switch (type) {
case 'c': { // Single character field (char).
char value = '\0';
if (field && minmea_isfield(*field))
value = *field;
*va_arg(ap, char *) = value;
} break;
case 'd': { // Single character direction field (int).
int value = 0;
if (field && minmea_isfield(*field)) {
switch (*field) {
case 'N':
case 'E':
value = 1;
break;
case 'S':
case 'W':
value = -1;
break;
default:
goto parse_error;
}
}
*va_arg(ap, int *) = value;
} break;
case 'f': { // Fractional value with scale (struct minmea_float).
int sign = 0;
int_least32_t value = -1;
int_least32_t scale = 0;
if (field) {
while (minmea_isfield(*field)) {
if (*field == '+' && !sign && value == -1) {
sign = 1;
} else if (*field == '-' && !sign && value == -1) {
sign = -1;
} else if (isdigit((unsigned char) *field)) {
int digit = *field - '0';
if (value == -1)
value = 0;
if (value > (INT_LEAST32_MAX-digit) / 10) {
/* we ran out of bits, what do we do? */
if (scale) {
/* truncate extra precision */
break;
} else {
/* integer overflow. bail out. */
goto parse_error;
}
}
value = (10 * value) + digit;
if (scale)
scale *= 10;
} else if (*field == '.' && scale == 0) {
scale = 1;
} else if (*field == ' ') {
/* Allow spaces at the start of the field. Not NMEA
* conformant, but some modules do this. */
if (sign != 0 || value != -1 || scale != 0)
goto parse_error;
} else {
goto parse_error;
}
field++;
}
}
if ((sign || scale) && value == -1)
goto parse_error;
if (value == -1) {
/* No digits were scanned. */
value = 0;
scale = 0;
} else if (scale == 0) {
/* No decimal point. */
scale = 1;
}
if (sign)
value *= sign;
*va_arg(ap, struct minmea_float *) = (struct minmea_float) {value, scale};
} break;
case 'i': { // Integer value, default 0 (int).
int value = 0;
if (field) {
char *endptr;
value = strtol(field, &endptr, 10);
if (minmea_isfield(*endptr))
goto parse_error;
}
*va_arg(ap, int *) = value;
} break;
case 's': { // String value (char *).
char *buf = va_arg(ap, char *);
if (field) {
while (minmea_isfield(*field))
*buf++ = *field++;
}
*buf = '\0';
} break;
case 't': { // NMEA talker+sentence identifier (char *).
// This field is always mandatory.
if (!field)
goto parse_error;
if (field[0] != '$')
goto parse_error;
for (int f=0; f<5; f++)
if (!minmea_isfield(field[1+f]))
goto parse_error;
char *buf = va_arg(ap, char *);
memcpy(buf, field+1, 5);
buf[5] = '\0';
} break;
case 'D': { // Date (int, int, int), -1 if empty.
struct minmea_date *date = va_arg(ap, struct minmea_date *);
int d = -1, m = -1, y = -1;
if (field && minmea_isfield(*field)) {
// Always six digits.
for (int f=0; f<6; f++)
if (!isdigit((unsigned char) field[f]))
goto parse_error;
char dArr[] = {field[0], field[1], '\0'};
char mArr[] = {field[2], field[3], '\0'};
char yArr[] = {field[4], field[5], '\0'};
d = strtol(dArr, NULL, 10);
m = strtol(mArr, NULL, 10);
y = strtol(yArr, NULL, 10);
}
date->day = d;
date->month = m;
date->year = y;
} break;
case 'T': { // Time (int, int, int, int), -1 if empty.
struct minmea_time *time_ = va_arg(ap, struct minmea_time *);
int h = -1, i = -1, s = -1, u = -1;
if (field && minmea_isfield(*field)) {
// Minimum required: integer time.
for (int f=0; f<6; f++)
if (!isdigit((unsigned char) field[f]))
goto parse_error;
char hArr[] = {field[0], field[1], '\0'};
char iArr[] = {field[2], field[3], '\0'};
char sArr[] = {field[4], field[5], '\0'};
h = strtol(hArr, NULL, 10);
i = strtol(iArr, NULL, 10);
s = strtol(sArr, NULL, 10);
field += 6;
// Extra: fractional time. Saved as microseconds.
if (*field++ == '.') {
uint32_t value = 0;
uint32_t scale = 1000000LU;
while (isdigit((unsigned char) *field) && scale > 1) {
value = (value * 10) + (*field++ - '0');
scale /= 10;
}
u = value * scale;
} else {
u = 0;
}
}
time_->hours = h;
time_->minutes = i;
time_->seconds = s;
time_->microseconds = u;
} break;
case '_': { // Ignore the field.
} break;
default: { // Unknown.
goto parse_error;
} break;
}
next_field();
}
result = true;
parse_error:
va_end(ap);
return result;
}
bool minmea_talker_id(char talker[3], const char *sentence)
{
char type[6];
if (!minmea_scan(sentence, "t", type))
return false;
talker[0] = type[0];
talker[1] = type[1];
talker[2] = '\0';
return true;
}
enum minmea_sentence_id minmea_sentence_id(const char *sentence, bool strict)
{
if (!minmea_check(sentence, strict))
return MINMEA_INVALID;
char type[6];
if (!minmea_scan(sentence, "t", type))
return MINMEA_INVALID;
if (!strcmp(type+2, "RMC"))
return MINMEA_SENTENCE_RMC;
if (!strcmp(type+2, "GGA"))
return MINMEA_SENTENCE_GGA;
if (!strcmp(type+2, "GSA"))
return MINMEA_SENTENCE_GSA;
if (!strcmp(type+2, "GLL"))
return MINMEA_SENTENCE_GLL;
if (!strcmp(type+2, "GST"))
return MINMEA_SENTENCE_GST;
if (!strcmp(type+2, "GSV"))
return MINMEA_SENTENCE_GSV;
if (!strcmp(type+2, "VTG"))
return MINMEA_SENTENCE_VTG;
if (!strcmp(type+2, "ZDA"))
return MINMEA_SENTENCE_ZDA;
return MINMEA_UNKNOWN;
}
bool minmea_parse_rmc(struct minmea_sentence_rmc *frame, const char *sentence)
{
// $GPRMC,081836,A,3751.65,S,14507.36,E,000.0,360.0,130998,011.3,E*62
char type[6];
char validity;
int latitude_direction;
int longitude_direction;
int variation_direction;
if (!minmea_scan(sentence, "tTcfdfdffDfd",
type,
&frame->time,
&validity,
&frame->latitude, &latitude_direction,
&frame->longitude, &longitude_direction,
&frame->speed,
&frame->course,
&frame->date,
&frame->variation, &variation_direction))
return false;
if (strcmp(type+2, "RMC"))
return false;
frame->valid = (validity == 'A');
frame->latitude.value *= latitude_direction;
frame->longitude.value *= longitude_direction;
frame->variation.value *= variation_direction;
return true;
}
bool minmea_parse_gga(struct minmea_sentence_gga *frame, const char *sentence)
{
// $GPGGA,123519,4807.038,N,01131.000,E,1,08,0.9,545.4,M,46.9,M,,*47
char type[6];
int latitude_direction;
int longitude_direction;
if (!minmea_scan(sentence, "tTfdfdiiffcfci_",
type,
&frame->time,
&frame->latitude, &latitude_direction,
&frame->longitude, &longitude_direction,
&frame->fix_quality,
&frame->satellites_tracked,
&frame->hdop,
&frame->altitude, &frame->altitude_units,
&frame->height, &frame->height_units,
&frame->dgps_age))
return false;
if (strcmp(type+2, "GGA"))
return false;
frame->latitude.value *= latitude_direction;
frame->longitude.value *= longitude_direction;
return true;
}
bool minmea_parse_gsa(struct minmea_sentence_gsa *frame, const char *sentence)
{
// $GPGSA,A,3,04,05,,09,12,,,24,,,,,2.5,1.3,2.1*39
char type[6];
if (!minmea_scan(sentence, "tciiiiiiiiiiiiifff",
type,
&frame->mode,
&frame->fix_type,
&frame->sats[0],
&frame->sats[1],
&frame->sats[2],
&frame->sats[3],
&frame->sats[4],
&frame->sats[5],
&frame->sats[6],
&frame->sats[7],
&frame->sats[8],
&frame->sats[9],
&frame->sats[10],
&frame->sats[11],
&frame->pdop,
&frame->hdop,
&frame->vdop))
return false;
if (strcmp(type+2, "GSA"))
return false;
return true;
}
bool minmea_parse_gll(struct minmea_sentence_gll *frame, const char *sentence)
{
// $GPGLL,3723.2475,N,12158.3416,W,161229.487,A,A*41$;
char type[6];
int latitude_direction;
int longitude_direction;
if (!minmea_scan(sentence, "tfdfdTc;c",
type,
&frame->latitude, &latitude_direction,
&frame->longitude, &longitude_direction,
&frame->time,
&frame->status,
&frame->mode))
return false;
if (strcmp(type+2, "GLL"))
return false;
frame->latitude.value *= latitude_direction;
frame->longitude.value *= longitude_direction;
return true;
}
bool minmea_parse_gst(struct minmea_sentence_gst *frame, const char *sentence)
{
// $GPGST,024603.00,3.2,6.6,4.7,47.3,5.8,5.6,22.0*58
char type[6];
if (!minmea_scan(sentence, "tTfffffff",
type,
&frame->time,
&frame->rms_deviation,
&frame->semi_major_deviation,
&frame->semi_minor_deviation,
&frame->semi_major_orientation,
&frame->latitude_error_deviation,
&frame->longitude_error_deviation,
&frame->altitude_error_deviation))
return false;
if (strcmp(type+2, "GST"))
return false;
return true;
}
bool minmea_parse_gsv(struct minmea_sentence_gsv *frame, const char *sentence)
{
// $GPGSV,3,1,11,03,03,111,00,04,15,270,00,06,01,010,00,13,06,292,00*74
// $GPGSV,3,3,11,22,42,067,42,24,14,311,43,27,05,244,00,,,,*4D
// $GPGSV,4,2,11,08,51,203,30,09,45,215,28*75
// $GPGSV,4,4,13,39,31,170,27*40
// $GPGSV,4,4,13*7B
char type[6];
if (!minmea_scan(sentence, "tiii;iiiiiiiiiiiiiiii",
type,
&frame->total_msgs,
&frame->msg_nr,
&frame->total_sats,
&frame->sats[0].nr,
&frame->sats[0].elevation,
&frame->sats[0].azimuth,
&frame->sats[0].snr,
&frame->sats[1].nr,
&frame->sats[1].elevation,
&frame->sats[1].azimuth,
&frame->sats[1].snr,
&frame->sats[2].nr,
&frame->sats[2].elevation,
&frame->sats[2].azimuth,
&frame->sats[2].snr,
&frame->sats[3].nr,
&frame->sats[3].elevation,
&frame->sats[3].azimuth,
&frame->sats[3].snr
)) {
return false;
}
if (strcmp(type+2, "GSV"))
return false;
return true;
}
bool minmea_parse_vtg(struct minmea_sentence_vtg *frame, const char *sentence)
{
// $GPVTG,054.7,T,034.4,M,005.5,N,010.2,K*48
// $GPVTG,156.1,T,140.9,M,0.0,N,0.0,K*41
// $GPVTG,096.5,T,083.5,M,0.0,N,0.0,K,D*22
// $GPVTG,188.36,T,,M,0.820,N,1.519,K,A*3F
char type[6];
char c_true, c_magnetic, c_knots, c_kph, c_faa_mode;
if (!minmea_scan(sentence, "tfcfcfcfc;c",
type,
&frame->true_track_degrees,
&c_true,
&frame->magnetic_track_degrees,
&c_magnetic,
&frame->speed_knots,
&c_knots,
&frame->speed_kph,
&c_kph,
&c_faa_mode))
return false;
if (strcmp(type+2, "VTG"))
return false;
// check chars
if (c_true != 'T' ||
c_magnetic != 'M' ||
c_knots != 'N' ||
c_kph != 'K')
return false;
frame->faa_mode = c_faa_mode;
return true;
}
bool minmea_parse_zda(struct minmea_sentence_zda *frame, const char *sentence)
{
// $GPZDA,201530.00,04,07,2002,00,00*60
char type[6];
if(!minmea_scan(sentence, "tTiiiii",
type,
&frame->time,
&frame->date.day,
&frame->date.month,
&frame->date.year,
&frame->hour_offset,
&frame->minute_offset))
return false;
if (strcmp(type+2, "ZDA"))
return false;
// check offsets
if (abs(frame->hour_offset) > 13 ||
frame->minute_offset > 59 ||
frame->minute_offset < 0)
return false;
return true;
}
int minmea_gettime(struct timespec *ts, const struct minmea_date *date, const struct minmea_time *time_)
{
if (date->year == -1 || time_->hours == -1)
return -1;
struct tm tm;
memset(&tm, 0, sizeof(tm));
if (date->year < 80) {
tm.tm_year = 2000 + date->year - 1900; // 2000-2079
} else if (date->year >= 1900) {
tm.tm_year = date->year - 1900; // 4 digit year, use directly
} else {
tm.tm_year = date->year; // 1980-1999
}
tm.tm_mon = date->month - 1;
tm.tm_mday = date->day;
tm.tm_hour = time_->hours;
tm.tm_min = time_->minutes;
tm.tm_sec = time_->seconds;
time_t timestamp = mktime(&tm);
if (timestamp != -1) {
ts->tv_sec = timestamp;
ts->tv_nsec = time_->microseconds * 1000;
return 0;
} else {
return -1;
}
}
/* vim: set ts=4 sw=4 et: */

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/*
* Copyright © 2014 Kosma Moczek <kosma@cloudyourcar.com>
* This program is free software. It comes without any warranty, to the extent
* permitted by applicable law. You can redistribute it and/or modify it under
* the terms of the Do What The Fuck You Want To Public License, Version 2, as
* published by Sam Hocevar. See the COPYING file for more details.
*/
#ifndef MINMEA_H
#define MINMEA_H
#ifdef __cplusplus
extern "C" {
#endif
#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#include <errno.h>
#include <time.h>
#include <math.h>
#ifdef MINMEA_INCLUDE_COMPAT
#include <minmea_compat.h>
#endif
#define MINMEA_MAX_LENGTH 80
enum minmea_sentence_id {
MINMEA_INVALID = -1,
MINMEA_UNKNOWN = 0,
MINMEA_SENTENCE_RMC,
MINMEA_SENTENCE_GGA,
MINMEA_SENTENCE_GSA,
MINMEA_SENTENCE_GLL,
MINMEA_SENTENCE_GST,
MINMEA_SENTENCE_GSV,
MINMEA_SENTENCE_VTG,
MINMEA_SENTENCE_ZDA,
};
struct minmea_float {
int_least32_t value;
int_least32_t scale;
};
struct minmea_date {
int day;
int month;
int year;
};
struct minmea_time {
int hours;
int minutes;
int seconds;
int microseconds;
};
struct minmea_sentence_rmc {
struct minmea_time time;
bool valid;
struct minmea_float latitude;
struct minmea_float longitude;
struct minmea_float speed;
struct minmea_float course;
struct minmea_date date;
struct minmea_float variation;
};
struct minmea_sentence_gga {
struct minmea_time time;
struct minmea_float latitude;
struct minmea_float longitude;
int fix_quality;
int satellites_tracked;
struct minmea_float hdop;
struct minmea_float altitude; char altitude_units;
struct minmea_float height; char height_units;
int dgps_age;
};
enum minmea_gll_status {
MINMEA_GLL_STATUS_DATA_VALID = 'A',
MINMEA_GLL_STATUS_DATA_NOT_VALID = 'V',
};
// FAA mode added to some fields in NMEA 2.3.
enum minmea_faa_mode {
MINMEA_FAA_MODE_AUTONOMOUS = 'A',
MINMEA_FAA_MODE_DIFFERENTIAL = 'D',
MINMEA_FAA_MODE_ESTIMATED = 'E',
MINMEA_FAA_MODE_MANUAL = 'M',
MINMEA_FAA_MODE_SIMULATED = 'S',
MINMEA_FAA_MODE_NOT_VALID = 'N',
MINMEA_FAA_MODE_PRECISE = 'P',
};
struct minmea_sentence_gll {
struct minmea_float latitude;
struct minmea_float longitude;
struct minmea_time time;
char status;
char mode;
};
struct minmea_sentence_gst {
struct minmea_time time;
struct minmea_float rms_deviation;
struct minmea_float semi_major_deviation;
struct minmea_float semi_minor_deviation;
struct minmea_float semi_major_orientation;
struct minmea_float latitude_error_deviation;
struct minmea_float longitude_error_deviation;
struct minmea_float altitude_error_deviation;
};
enum minmea_gsa_mode {
MINMEA_GPGSA_MODE_AUTO = 'A',
MINMEA_GPGSA_MODE_FORCED = 'M',
};
enum minmea_gsa_fix_type {
MINMEA_GPGSA_FIX_NONE = 1,
MINMEA_GPGSA_FIX_2D = 2,
MINMEA_GPGSA_FIX_3D = 3,
};
struct minmea_sentence_gsa {
char mode;
int fix_type;
int sats[12];
struct minmea_float pdop;
struct minmea_float hdop;
struct minmea_float vdop;
};
struct minmea_sat_info {
int nr;
int elevation;
int azimuth;
int snr;
};
struct minmea_sentence_gsv {
int total_msgs;
int msg_nr;
int total_sats;
struct minmea_sat_info sats[4];
};
struct minmea_sentence_vtg {
struct minmea_float true_track_degrees;
struct minmea_float magnetic_track_degrees;
struct minmea_float speed_knots;
struct minmea_float speed_kph;
enum minmea_faa_mode faa_mode;
};
struct minmea_sentence_zda {
struct minmea_time time;
struct minmea_date date;
int hour_offset;
int minute_offset;
};
/**
* Calculate raw sentence checksum. Does not check sentence integrity.
*/
uint8_t minmea_checksum(const char *sentence);
/**
* Check sentence validity and checksum. Returns true for valid sentences.
*/
bool minmea_check(const char *sentence, bool strict);
/**
* Determine talker identifier.
*/
bool minmea_talker_id(char talker[3], const char *sentence);
/**
* Determine sentence identifier.
*/
enum minmea_sentence_id minmea_sentence_id(const char *sentence, bool strict);
/**
* Scanf-like processor for NMEA sentences. Supports the following formats:
* c - single character (char *)
* d - direction, returned as 1/-1, default 0 (int *)
* f - fractional, returned as value + scale (int *, int *)
* i - decimal, default zero (int *)
* s - string (char *)
* t - talker identifier and type (char *)
* T - date/time stamp (int *, int *, int *)
* Returns true on success. See library source code for details.
*/
bool minmea_scan(const char *sentence, const char *format, ...);
/*
* Parse a specific type of sentence. Return true on success.
*/
bool minmea_parse_rmc(struct minmea_sentence_rmc *frame, const char *sentence);
bool minmea_parse_gga(struct minmea_sentence_gga *frame, const char *sentence);
bool minmea_parse_gsa(struct minmea_sentence_gsa *frame, const char *sentence);
bool minmea_parse_gll(struct minmea_sentence_gll *frame, const char *sentence);
bool minmea_parse_gst(struct minmea_sentence_gst *frame, const char *sentence);
bool minmea_parse_gsv(struct minmea_sentence_gsv *frame, const char *sentence);
bool minmea_parse_vtg(struct minmea_sentence_vtg *frame, const char *sentence);
bool minmea_parse_zda(struct minmea_sentence_zda *frame, const char *sentence);
/**
* Convert GPS UTC date/time representation to a UNIX timestamp.
*/
int minmea_gettime(struct timespec *ts, const struct minmea_date *date, const struct minmea_time *time_);
/**
* Rescale a fixed-point value to a different scale. Rounds towards zero.
*/
static inline int_least32_t minmea_rescale(struct minmea_float *f, int_least32_t new_scale)
{
if (f->scale == 0)
return 0;
if (f->scale == new_scale)
return f->value;
if (f->scale > new_scale)
return (f->value + ((f->value > 0) - (f->value < 0)) * f->scale/new_scale/2) / (f->scale/new_scale);
else
return f->value * (new_scale/f->scale);
}
/**
* Convert a fixed-point value to a floating-point value.
* Returns NaN for "unknown" values.
*/
static inline float minmea_tofloat(struct minmea_float *f)
{
if (f->scale == 0)
return NAN;
return (float) f->value / (float) f->scale;
}
/**
* Convert a raw coordinate to a floating point DD.DDD... value.
* Returns NaN for "unknown" values.
*/
static inline float minmea_tocoord(struct minmea_float *f)
{
if (f->scale == 0)
return NAN;
int_least32_t degrees = f->value / (f->scale * 100);
int_least32_t minutes = f->value % (f->scale * 100);
return (float) degrees + (float) minutes / (60 * f->scale);
}
#ifdef __cplusplus
}
#endif
#endif /* MINMEA_H */
/* vim: set ts=4 sw=4 et: */