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Allow user to select temperature unit

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This commit is contained in:
Alexander Rosenberg
2024-04-02 14:53:04 -07:00
parent e1146fe006
commit 64f1cf2fe8
12 changed files with 381 additions and 295 deletions
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311
src/config.c Normal file
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@ -0,0 +1,311 @@
/*
* config.h - Config file parsing
* Copyright (C) 2024 Alexander Rosenberg
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version. See the LICENSE file for more information.
*/
#include "config.h"
#include "util.h"
#include <figpar.h>
#include <err.h>
#include <inttypes.h>
#include <ctype.h>
#include <string.h>
#include <errno.h>
static int unknown_key_callback(struct figpar_config *opt, uint32_t line,
char *directive, char *value) {
if (GLOBAL_OPTS.strict_config) {
errx(1, "line %" PRIu32 ": unknown configuration option: \"%s\"",
line, directive);
} else {
warnx("line %" PRIu32 ": unknown configuration option: \"%s\"",
line, directive);
}
return 0;
}
static int parse_uint_callback(struct figpar_config *opt, uint32_t line,
char *directive, char *value) {
char last_char;
if (sscanf(value, "%" SCNu32 " %c", &opt->value.u_num, &last_char) < 1 ||
(last_char && !isdigit(last_char))) {
warnx("line %" PRIu32 ": not a valid number \"%s\"", line, value);
return 1;
}
LOG_VERBOSE("Loaded config uint option: %s = %" PRIu32 "\n", directive,
opt->value.u_num);
opt->type = FIGPAR_TYPE_INT;
return 0;
}
static int parse_temp_unit_callback(struct figpar_config *opt, uint32_t line,
char *directive, char *value) {
if (strcasecmp(value, "c") == 0) {
opt->value.num = TEMP_UNIT_C;
} else if (strcasecmp(value, "f") == 0) {
opt->value.num = TEMP_UNIT_F;
} else {
warnx("not a valid temperature unit: \"%s\"", value);
return 1;
}
LOG_VERBOSE("Loaded temperature unit config option: %s = %c\n", directive,
toupper(value[0]));
opt->type = FIGPAR_TYPE_UINT;
return 0;
}
#define CONFIG_UINT_ARR_TYPE FIGPAR_TYPE_DATA1
struct UIntArr {
uint32_t *arr;
size_t size;
};
static int parse_uint_arr_callback(struct figpar_config *opt, uint32_t line,
char *directive, char *value) {
struct UIntArr *arr = malloc_checked(sizeof(struct UIntArr));
arr->size = 0;
arr->arr = NULL;
uint32_t num;
char last_char = 1;
int jump_len;
while (last_char && sscanf(value, "%" SCNu32 " %c%n",
&num, &last_char, &jump_len) >= 1) {
if (last_char && !isdigit(last_char)) {
warnx("line %" PRIu32 ": not a valid number array \"%s\"",
line, value);
FREE_CHECKED(arr->arr);
free(arr);
return 1;
}
arr->arr = realloc_checked(arr->arr, sizeof(uint32_t) * ++arr->size);
arr->arr[arr->size - 1] = num;
value += jump_len - 1; // -1 to add back the first digit
}
opt->type = CONFIG_UINT_ARR_TYPE;
opt->value.data = arr;
if (GLOBAL_OPTS.verbose) {
fprintf(stderr, "Loaded config uint array option: %s = ", directive);
for (size_t i = 0; i < arr->size; ++i) {
fprintf(stderr, "%" PRIu32, arr->arr[i]);
if (i < arr->size - 1) {
fputc(' ', stderr);
}
}
fputc('\n', stderr);
}
return 0;
}
static int parse_str_callback(struct figpar_config *opt, uint32_t line,
char *directive, char *value) {
FREE_CHECKED(opt->value.str);
if (!value[0]) {
opt->type = FIGPAR_TYPE_STR;
opt->value.str = NULL;
} else {
opt->type = FIGPAR_TYPE_STR;
opt->value.str = strdup_checked(value);
LOG_VERBOSE("Loaded config string option: %s = %s\n", directive, value);
}
return 0;
}
static char *steal_opt_if_set(char *str) {
if (str && !*str) {
free(str);
return NULL;
}
return str;
}
#define REQUIRE_KEY(ind, name) if (entries[ind].type == FIGPAR_TYPE_NONE) {\
errx(1, "%s must be specified", # name);\
}
static void set_options_from_entries(struct figpar_config *entries,
size_t nentries) {
entries[0].type = FIGPAR_TYPE_NONE;
GLOBAL_OPTS.gpio_path = entries[0].value.str;
LOG_VERBOSE("Using gpio_path: \"%s\"\n", GLOBAL_OPTS.gpio_path);
REQUIRE_KEY(1, rs_pin);
GLOBAL_OPTS.rs_pin = entries[1].value.u_num;
REQUIRE_KEY(2, rw_pin);
GLOBAL_OPTS.rw_pin = entries[2].value.u_num;
REQUIRE_KEY(3, en_pin);
GLOBAL_OPTS.en_pin = entries[3].value.u_num;
REQUIRE_KEY(4, data_pins);
struct UIntArr *arr = entries[4].value.data;
if (arr->size != 8) {
errx(1, "data_pins must be an array of 8 uints");
}
memcpy(GLOBAL_OPTS.data_pins, arr->arr, sizeof(uint32_t) * 8);
entries[5].type = FIGPAR_TYPE_NONE;
GLOBAL_OPTS.temp_key = steal_opt_if_set(entries[5].value.str);
LOG_VERBOSE("Using temp_key: \"%s\"\n", GLOBAL_OPTS.temp_key);
entries[6].type = FIGPAR_TYPE_NONE;
GLOBAL_OPTS.humid_key = steal_opt_if_set(entries[6].value.str);
LOG_VERBOSE("Using humid_key: \"%s\"\n", GLOBAL_OPTS.humid_key);
entries[7].type = FIGPAR_TYPE_NONE;
GLOBAL_OPTS.fail_key = steal_opt_if_set(entries[7].value.str);
LOG_VERBOSE("Using fail_key: \"%s\"\n", GLOBAL_OPTS.fail_key);
GLOBAL_OPTS.fail_limit = entries[8].value.u_num;
entries[9].type = FIGPAR_TYPE_NONE;
GLOBAL_OPTS.database_location = entries[9].value.str;
LOG_VERBOSE("Using database_location: \"%s\"\n",
GLOBAL_OPTS.database_location);
GLOBAL_OPTS.refresh_time = entries[10].value.u_num;
REQUIRE_KEY(11, sel_pin);
GLOBAL_OPTS.sel_pin = entries[11].value.u_num;
REQUIRE_KEY(12, up_pin);
GLOBAL_OPTS.up_pin = entries[12].value.u_num;
REQUIRE_KEY(13, down_pin);
GLOBAL_OPTS.down_pin = entries[13].value.u_num;
REQUIRE_KEY(14, back_pin);
GLOBAL_OPTS.back_pin = entries[14].value.u_num;
GLOBAL_OPTS.temp_unit = entries[15].value.num;
}
static char *strdup_default_opt(const char *def) {
if (!*def) {
return NULL;
}
return strdup_checked(def);
}
void parse_config_file(const char *path) {
LOG_VERBOSE("Loading config file: \"%s\"\n", path);
struct figpar_config entries[] = {
{
.directive = "gpio_file",
.type = FIGPAR_TYPE_STR,
.action = parse_str_callback,
.value = {.str = strdup_default_opt(DEFAULT_GPIO_DEVICE)},
},
{
.directive = "rs_pin",
.type = FIGPAR_TYPE_NONE,
.action = parse_uint_callback,
},
{
.directive = "rw_pin",
.type = FIGPAR_TYPE_NONE,
.action = parse_uint_callback,
},
{
.directive = "en_pin",
.type = FIGPAR_TYPE_NONE,
.action = parse_uint_callback,
},
{
.directive = "data_pins",
.type = FIGPAR_TYPE_NONE,
.action = parse_uint_arr_callback,
},
{
.directive = "temp_key",
.type = FIGPAR_TYPE_STR,
.action = parse_str_callback,
.value = {.str = strdup_default_opt(DEFAULT_TEMP_KEY)},
},
{
.directive = "humid_key",
.type = FIGPAR_TYPE_STR,
.action = parse_str_callback,
.value = {.str = strdup_default_opt(DEFAULT_HUMID_KEY)},
},
{
.directive = "fail_key",
.type = FIGPAR_TYPE_STR,
.action = parse_str_callback,
.value = {.str = strdup_default_opt(DEFAULT_FAIL_KEY)},
},
{
.directive = "fail_limit",
.type = FIGPAR_TYPE_UINT,
.action = parse_uint_callback,
.value = {.u_num = DEFAULT_FAIL_LIMIT},
},
{
.directive = "database_location",
.type = FIGPAR_TYPE_STR,
.action = parse_str_callback,
.value = {.str = strdup_default_opt(DEFAULT_DATABASE_LOCATION)},
},
{
.directive = "refresh_time",
.type = FIGPAR_TYPE_UINT,
.action = parse_uint_callback,
.value = {.u_num = DEFAULT_REFRESH_TIME},
},
{
.directive = "sel_pin",
.type = FIGPAR_TYPE_NONE,
.action = parse_uint_callback,
},
{
.directive = "up_pin",
.type = FIGPAR_TYPE_NONE,
.action = parse_uint_callback,
},
{
.directive = "down_pin",
.type = FIGPAR_TYPE_NONE,
.action = parse_uint_callback,
},
{
.directive = "back_pin",
.type = FIGPAR_TYPE_NONE,
.action = parse_uint_callback,
},
{
.directive = "temp_unit",
.type = FIGPAR_TYPE_INT,
.action = parse_temp_unit_callback,
.value = {.num = DEFAULT_TEMP_UNIT}
},
{ .directive = NULL },
};
size_t entry_count = sizeof(entries) / sizeof(struct figpar_config);
errno = 0;
int status = parse_config(entries, path, unknown_key_callback,
FIGPAR_BREAK_ON_EQUALS);
if (status < 0) {
err(1, "could not parse config file: \"%s\"", path);
} else if (status > 1) {
errx(1, "could not parse config file: \"%s\"", path);
}
set_options_from_entries(entries, entry_count);
for (size_t i = 0; i < entry_count; ++i) {
switch (entries[i].type) {
case FIGPAR_TYPE_STR:
FREE_CHECKED(entries[i].value.str);
break;
case CONFIG_UINT_ARR_TYPE:
FREE_CHECKED(((struct UIntArr *) entries[i].value.data)->arr);
FREE_CHECKED(entries[i].value.data);
break;
default: ; // ignore
}
}
LOG_VERBOSE("Finished loading config file\n");
}

15
src/config.h Normal file
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@ -0,0 +1,15 @@
/*
* config.h - Config file parsing
* Copyright (C) 2024 Alexander Rosenberg
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version. See the LICENSE file for more information.
*/
#ifndef INCLUDED_CONFIG_H
#define INCLUDED_CONFIG_H
void parse_config_file(const char *path);
#endif

274
src/main.c
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@ -12,6 +12,7 @@
#include "ths.h"
#include "button.h"
#include "menu.h"
#include "config.h"
#include "ui/screen.h"
#include "ui/statsby.h"
#include "ui/datapoints.h"
@ -41,10 +42,6 @@ void print_help(const char *exec_name);
* Parse command line arguments and save the options to OPTS.
*/
void parse_arguments(int argc, char *const *argv);
/*
* Parse config file PATH.
*/
void parse_config_file(const char *path);
/*
* Setup signals used to ensure clean termination.
*/
@ -167,275 +164,6 @@ void parse_arguments(int argc, char *const *argv) {
}
}
static int unknown_key_callback(struct figpar_config *opt, uint32_t line,
char *directive, char *value) {
if (GLOBAL_OPTS.strict_config) {
errx(1, "line %" PRIu32 ": unknown configuration option: \"%s\"",
line, directive);
} else {
warnx("line %" PRIu32 ": unknown configuration option: \"%s\"",
line, directive);
}
return 0;
}
static int parse_uint_callback(struct figpar_config *opt, uint32_t line,
char *directive, char *value) {
char last_char;
if (sscanf(value, "%" SCNu32 " %c", &opt->value.u_num, &last_char) < 1 ||
(last_char && !isdigit(last_char))) {
warnx("line %" PRIu32 ": not a valid number \"%s\"", line, value);
return 1;
}
LOG_VERBOSE("Loaded config uint option: %s = %" PRIu32 "\n", directive,
opt->value.u_num);
opt->type = FIGPAR_TYPE_UINT;
return 0;
}
#define CONFIG_UINT_ARR_TYPE FIGPAR_TYPE_DATA1
struct UIntArr {
uint32_t *arr;
size_t size;
};
static int parse_uint_arr_callback(struct figpar_config *opt, uint32_t line,
char *directive, char *value) {
struct UIntArr *arr = malloc_checked(sizeof(struct UIntArr));
arr->size = 0;
arr->arr = NULL;
uint32_t num;
char last_char = 1;
int jump_len;
while (last_char && sscanf(value, "%" SCNu32 " %c%n",
&num, &last_char, &jump_len) >= 1) {
if (last_char && !isdigit(last_char)) {
warnx("line %" PRIu32 ": not a valid number array \"%s\"",
line, value);
FREE_CHECKED(arr->arr);
free(arr);
return 1;
}
arr->arr = realloc_checked(arr->arr, sizeof(uint32_t) * ++arr->size);
arr->arr[arr->size - 1] = num;
value += jump_len - 1; // -1 to add back the first digit
}
opt->type = CONFIG_UINT_ARR_TYPE;
opt->value.data = arr;
if (GLOBAL_OPTS.verbose) {
fprintf(stderr, "Loaded config uint array option: %s = ", directive);
for (size_t i = 0; i < arr->size; ++i) {
fprintf(stderr, "%" PRIu32, arr->arr[i]);
if (i < arr->size - 1) {
fputc(' ', stderr);
}
}
fputc('\n', stderr);
}
return 0;
}
static int parse_str_callback(struct figpar_config *opt, uint32_t line,
char *directive, char *value) {
FREE_CHECKED(opt->value.str);
if (!value[0]) {
opt->type = FIGPAR_TYPE_STR;
opt->value.str = NULL;
} else {
opt->type = FIGPAR_TYPE_STR;
opt->value.str = strdup_checked(value);
LOG_VERBOSE("Loaded config string option: %s = %s\n", directive, value);
}
return 0;
}
static char *steal_opt_if_set(char *str) {
if (str && !*str) {
free(str);
return NULL;
}
return str;
}
#define REQUIRE_KEY(ind, name) if (entries[ind].type == FIGPAR_TYPE_NONE) {\
errx(1, "%s must be specified", # name);\
}
static void set_options_from_entries(struct figpar_config *entries,
size_t nentries) {
entries[0].type = FIGPAR_TYPE_NONE;
GLOBAL_OPTS.gpio_path = entries[0].value.str;
LOG_VERBOSE("Using gpio_path: \"%s\"\n", GLOBAL_OPTS.gpio_path);
REQUIRE_KEY(1, rs_pin);
GLOBAL_OPTS.rs_pin = entries[1].value.u_num;
REQUIRE_KEY(2, rw_pin);
GLOBAL_OPTS.rw_pin = entries[2].value.u_num;
REQUIRE_KEY(3, en_pin);
GLOBAL_OPTS.en_pin = entries[3].value.u_num;
REQUIRE_KEY(4, data_pins);
struct UIntArr *arr = entries[4].value.data;
if (arr->size != 8) {
errx(1, "data_pins must be an array of 8 uints");
}
memcpy(GLOBAL_OPTS.data_pins, arr->arr, sizeof(uint32_t) * 8);
entries[5].type = FIGPAR_TYPE_NONE;
GLOBAL_OPTS.temp_key = steal_opt_if_set(entries[5].value.str);
LOG_VERBOSE("Using temp_key: \"%s\"\n", GLOBAL_OPTS.temp_key);
entries[6].type = FIGPAR_TYPE_NONE;
GLOBAL_OPTS.humid_key = steal_opt_if_set(entries[6].value.str);
LOG_VERBOSE("Using humid_key: \"%s\"\n", GLOBAL_OPTS.humid_key);
entries[7].type = FIGPAR_TYPE_NONE;
GLOBAL_OPTS.fail_key = steal_opt_if_set(entries[7].value.str);
LOG_VERBOSE("Using fail_key: \"%s\"\n", GLOBAL_OPTS.fail_key);
GLOBAL_OPTS.fail_limit = entries[8].value.u_num;
entries[9].type = FIGPAR_TYPE_NONE;
GLOBAL_OPTS.database_location = entries[9].value.str;
LOG_VERBOSE("Using database_location: \"%s\"\n",
GLOBAL_OPTS.database_location);
GLOBAL_OPTS.refresh_time = entries[10].value.u_num;
REQUIRE_KEY(11, sel_pin);
GLOBAL_OPTS.sel_pin = entries[11].value.u_num;
REQUIRE_KEY(12, up_pin);
GLOBAL_OPTS.up_pin = entries[12].value.u_num;
REQUIRE_KEY(13, down_pin);
GLOBAL_OPTS.down_pin = entries[13].value.u_num;
REQUIRE_KEY(14, back_pin);
GLOBAL_OPTS.back_pin = entries[14].value.u_num;
}
static char *strdup_default_opt(const char *def) {
if (!*def) {
return NULL;
}
return strdup_checked(def);
}
void parse_config_file(const char *path) {
LOG_VERBOSE("Loading config file: \"%s\"\n", path);
struct figpar_config entries[] = {
{
.directive = "gpio_file",
.type = FIGPAR_TYPE_STR,
.action = parse_str_callback,
.value = {.str = strdup_default_opt(DEFAULT_GPIO_DEVICE)},
},
{
.directive = "rs_pin",
.type = FIGPAR_TYPE_NONE,
.action = parse_uint_callback,
},
{
.directive = "rw_pin",
.type = FIGPAR_TYPE_NONE,
.action = parse_uint_callback,
},
{
.directive = "en_pin",
.type = FIGPAR_TYPE_NONE,
.action = parse_uint_callback,
},
{
.directive = "data_pins",
.type = FIGPAR_TYPE_NONE,
.action = parse_uint_arr_callback,
},
{
.directive = "temp_key",
.type = FIGPAR_TYPE_STR,
.action = parse_str_callback,
.value = {.str = strdup_default_opt(DEFAULT_TEMP_KEY)},
},
{
.directive = "humid_key",
.type = FIGPAR_TYPE_STR,
.action = parse_str_callback,
.value = {.str = strdup_default_opt(DEFAULT_HUMID_KEY)},
},
{
.directive = "fail_key",
.type = FIGPAR_TYPE_STR,
.action = parse_str_callback,
.value = {.str = strdup_default_opt(DEFAULT_FAIL_KEY)},
},
{
.directive = "fail_limit",
.type = FIGPAR_TYPE_UINT,
.action = parse_uint_callback,
.value = {.u_num = DEFAULT_FAIL_LIMIT},
},
{
.directive = "database_location",
.type = FIGPAR_TYPE_STR,
.action = parse_str_callback,
.value = {.str = strdup_default_opt(DEFAULT_DATABASE_LOCATION)},
},
{
.directive = "refresh_time",
.type = FIGPAR_TYPE_UINT,
.action = parse_uint_callback,
.value = {.u_num = DEFAULT_REFRESH_TIME},
},
{
.directive = "sel_pin",
.type = FIGPAR_TYPE_NONE,
.action = parse_uint_callback,
},
{
.directive = "up_pin",
.type = FIGPAR_TYPE_NONE,
.action = parse_uint_callback,
},
{
.directive = "down_pin",
.type = FIGPAR_TYPE_NONE,
.action = parse_uint_callback,
},
{
.directive = "back_pin",
.type = FIGPAR_TYPE_NONE,
.action = parse_uint_callback,
},
{ .directive = NULL },
};
size_t entry_count = sizeof(entries) / sizeof(struct figpar_config);
errno = 0;
int status = parse_config(entries, path, unknown_key_callback,
FIGPAR_BREAK_ON_EQUALS);
if (status < 0) {
err(1, "could not parse config file: \"%s\"", path);
} else if (status > 1) {
errx(1, "could not parse config file: \"%s\"", path);
}
set_options_from_entries(entries, entry_count);
for (size_t i = 0; i < entry_count; ++i) {
switch (entries[i].type) {
case FIGPAR_TYPE_STR:
FREE_CHECKED(entries[i].value.str);
break;
case CONFIG_UINT_ARR_TYPE:
FREE_CHECKED(((struct UIntArr *) entries[i].value.data)->arr);
FREE_CHECKED(entries[i].value.data);
break;
default: ; // ignore
}
}
LOG_VERBOSE("Finished loading config file\n");
}
static void exit_signal_callback(int sig) {
LOG_VERBOSE("Caught signal %d. Exiting...\n", sig);
RUNNING = false;

9
src/ths.h
View File

@ -24,15 +24,6 @@ typedef struct {
int fail_mib[THS_MIB_BUF_SIZE];
} THS;
/*
* Convert deciKelvin to degrees Celsius
*/
#define DK_TO_C(k) ((k) / 10.0f - 273.15f)
/*
* Convert deciKelvin to degrees Fahrenheit
*/
#define DK_TO_F(k) (((DK_TO_C((k))) * 1.8f) + 32.0f)
/*
* Create a new THS from the given sysctl keys. Any of the keys can be null.
* Return: the new THS, or NULL if an error occurred.

5
src/ui/datapoints.c
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@ -8,7 +8,6 @@
* version. See the LICENSE file for more information.
*/
#include "datapoints.h"
#include "../ths.h"
#include <inttypes.h>
#include <time.h>
@ -128,8 +127,8 @@ static void data_points_show(DataPointsScreen *screen, SensorState *state) {
lcd_move_to(state->lcd, 0, 0);
lcd_write_string(state->lcd, str_time);
char data_line[17];
snprintf(data_line, 17, "%02ds %.1fF %d%%", broken_time.tm_sec,
DK_TO_F(temp), humid);
snprintf(data_line, 17, "%02ds %.1f%c %d%%", broken_time.tm_sec,
convert_temperature(temp), GLOBAL_OPTS.temp_unit, humid);
lcd_move_to(state->lcd, 1, 0);
lcd_write_string(state->lcd, data_line);
}

6
src/ui/screen.c
View File

@ -8,7 +8,6 @@
* version. See the LICENSE file for more information.
*/
#include "screen.h"
#include "../ths.h"
#include <err.h>
#include <inttypes.h>
@ -149,8 +148,9 @@ static bool stats_screen_dispatch(StatsScreen *screen, SensorState *state) {
lcd_clear(state->lcd);
lcd_write_string(state->lcd, "temp humi time");
char buff[17];
int cur_len = snprintf(buff, sizeof(buff), "%4.1fF %3" PRIu32 "%% ",
DK_TO_F(state->temp), state->humid);
int cur_len = snprintf(buff, sizeof(buff), "%.1f%c %3" PRIu32 "%% ",
convert_temperature(state->temp),
GLOBAL_OPTS.temp_unit, state->humid);
struct tm lt;
localtime_r(&cur_time, &lt);
strftime(buff + cur_len, sizeof(buff) - cur_len,

5
src/ui/statrange.c
View File

@ -8,7 +8,6 @@
* version. See the LICENSE file for more information.
*/
#include "statrange.h"
#include "../ths.h"
#include <inttypes.h>
#include <time.h>
@ -117,7 +116,9 @@ static void stat_range_show_data(StatRangeScreen *screen, SensorState *state) {
lcd_move_to(state->lcd, 1, 0);
if (data.npoints) {
char data_line[17];
snprintf(data_line, 17, "%.1fF %d%%", DK_TO_F(data.temp), data.humid);
snprintf(data_line, 17, "%.1f%c %d%%",
convert_temperature(data.temp),
GLOBAL_OPTS.temp_unit, data.humid);
lcd_write_string(state->lcd, data_line);
} else {
lcd_write_string(state->lcd, "No data!");

5
src/ui/statsby.c
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@ -8,7 +8,6 @@
* version. See the LICENSE file for more information.
*/
#include "statsby.h"
#include "../ths.h"
#include <err.h>
@ -122,7 +121,9 @@ static void stats_by_show_stats(StatsByScreen *screen, SensorState *state) {
lcd_move_to(state->lcd, 1, 0);
if (data.npoints) {
char data_string[17];
snprintf(data_string, 17, "T:%.1fF H:%d%%", DK_TO_F(data.temp), data.humid);
snprintf(data_string, 17, "T:%.1f%c H:%d%%",
convert_temperature(data.temp), GLOBAL_OPTS.temp_unit,
data.humid);
lcd_write_string(state->lcd, data_string);
} else {
lcd_write_string(state->lcd, "No data!");

21
src/util.c
View File

@ -331,3 +331,24 @@ bool get_average_for_range(sqlite3 *db, uint64_t start, uint64_t end,
sqlite3_reset(AVG_FOR_RANGE_QUERY);
return success;
}
/*
* Convert deciKelvin to degrees Celsius
*/
#define DK_TO_C(k) ((k) / 10.0f - 273.15f)
/*
* Convert deciKelvin to degrees Fahrenheit
*/
#define DK_TO_F(k) (((DK_TO_C((k))) * 1.8f) + 32.0f)
float convert_temperature(int dk) {
switch (GLOBAL_OPTS.temp_unit) {
case TEMP_UNIT_C:
return DK_TO_C(dk);
case TEMP_UNIT_F:
return DK_TO_F(dk);
default:
warnx("Unknown temperature unit: 0x%x", GLOBAL_OPTS.temp_unit);
return 0.0f;
}
}

12
src/util.h
View File

@ -19,6 +19,11 @@
#include <libgpio.h>
#include <sqlite3.h>
typedef enum {
TEMP_UNIT_F = 'F',
TEMP_UNIT_C = 'C'
} TemperatureUnit;
typedef struct {
char *config_path; // path to config file
bool strict_config; // exit if unknown config options is found
@ -41,6 +46,8 @@ typedef struct {
gpio_pin_t down_pin;
gpio_pin_t back_pin;
gpio_pin_t sel_pin;
TemperatureUnit temp_unit;
} Options;
extern Options GLOBAL_OPTS;
@ -183,4 +190,9 @@ typedef struct {
bool get_average_for_range(sqlite3 *db, uint64_t start, uint64_t end,
UtilAverageRange *data);
/*
* Convert the temperature in deciKelvin DK to either F or C.
*/
float convert_temperature(int dk);
#endif