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Arg parsing, ths sensor, and config file

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This commit is contained in:
Alexander Rosenberg 2024-02-25 23:59:26 -08:00
parent cc7992bd93
commit 58e7bc053e
Signed by: school-rpi4
GPG Key ID: 5CCFC80B0B47B04B
10 changed files with 609 additions and 63 deletions
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2
.gitignore vendored
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@ -1,2 +1,4 @@
*.o
rpi4b-temp-humidity
compile_commands.json
.cache/

21
Makefile
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@ -1,18 +1,29 @@
CC=clang
CFLAGS=-std=c99
CFLAGS=-std=c99 -g
LD=clang
LDFLAGS=-lgpio
OBJS=main.o util.o lcd.o
LDFLAGS=-lgpio -lfigpar
OBJS=main.o util.o lcd.o ths.o
OUTFILE=rpi4b-temp-humidity
.include "config.mk"
${OUTFILE}: ${OBJS}
${LD} ${LDFLAGS} -o $@ ${OBJS}
main.o util.o lcd.o ths.o: util.h
main.o lcd.o: lcd.h
main.o util.o lcd.o: util.h
main.o ths.o: ths.h
.c.o:
${CC} ${CFLAGS} -c $<
${CC} ${CFLAGS} -c\
-DDEFAULT_CONFIG_PATH="\"${DEFAULT_CONFIG_PATH}\""\
-DDEFAULT_GPIO_DEVICE="\"${DEFAULT_GPIO_DEVICE}\""\
-DDEFAULT_TEMP_KEY="\"${DEFAULT_TEMP_KEY}\""\
-DDEFAULT_HUMID_KEY="\"${DEFAULT_HUMID_KEY}\""\
-DDEFAULT_FAIL_KEY="\"${DEFAULT_FAIL_KEY}\""\
-DDEFAULT_FAIL_LIMIT="${DEFAULT_FAIL_LIMIT}"\
-DDEFAULT_LCD_VERSION="\"${DEFAULT_LCD_VERSION}\""\
$<
clean:
rm -f ${OUTFILE} ${OBJS}

7
config.mk Normal file
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@ -0,0 +1,7 @@
DEFAULT_CONFIG_PATH=config.conf
DEFAULT_GPIO_DEVICE=/dev/gpioc0
DEFAULT_TEMP_KEY=dev.gpioths.0.temperature
DEFAULT_HUMID_KEY=dev.gpioths.0.humidity
DEFAULT_FAIL_KEY=dev.gpioths.0.fails
DEFAULT_FAIL_LIMIT=5
DEFAULT_LCD_VERSION=jp

23
lcd.c
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@ -45,8 +45,9 @@ static void lcd_pulse_enable(LCD *lcd) {
gpio_pin_low(lcd->handle, lcd->en);
}
LCD *lcd_open(gpio_handle_t handle, int rs, int rw, int en, int d0, int d1,
int d2, int d3, int d4, int d5, int d6, int d7) {
LCD *lcd_open(gpio_handle_t handle, gpio_pin_t rs, gpio_pin_t rw, gpio_pin_t en,
gpio_pin_t d0, gpio_pin_t d1, gpio_pin_t d2, gpio_pin_t d3,
gpio_pin_t d4, gpio_pin_t d5, gpio_pin_t d6, gpio_pin_t d7) {
LCD *lcd = malloc_checked(sizeof(LCD));
lcd->handle = handle;
lcd->rs = rs;
@ -60,20 +61,24 @@ LCD *lcd_open(gpio_handle_t handle, int rs, int rw, int en, int d0, int d1,
lcd->d5 = d5;
lcd->d6 = d6;
lcd->d7 = d7;
lcd_set_read(lcd, false, true);
lcd_set_read(lcd, true, true);
lcd_clear(lcd);
lcd_call(lcd, 0, 0, 0, 0, 1, 1, 1, 0, 0); // 5x8 font, 2 lines, 8bit
lcd_entry_mode(lcd, LCD_INCREMENT, LCD_CURSOR_MOVE);
lcd_display_control(lcd, LCD_CURSOR_NO_BLINK, LCD_CURSOR_OFF, LCD_DISPLAY_ON);
LOG_VERBOSE("Initializing LCD: rs=%d, rw=%d, en=%d, d={%d, %d, %d, %d, %d,"
"%d, %d, %d}\n", rs, rw, en, d0, d1, d2, d3, d4, d5, d6, d7);
return lcd;
}
void lcd_close(LCD *lcd) {
LOG_VERBOSE("Closing LCD\n");
free(lcd);
}
void lcd_call(LCD *lcd, int rs, int d0, int d1, int d2, int d3, int d4, int d5,
int d6, int d7) {
void lcd_call(LCD *lcd, gpio_value_t rs, gpio_value_t d0, gpio_value_t d1,
gpio_value_t d2, gpio_value_t d3, gpio_value_t d4,
gpio_value_t d5, gpio_value_t d6, gpio_value_t d7) {
while(lcd_is_busy(lcd)) {
usleep(5);
}
@ -105,7 +110,7 @@ size_t lcd_write_string(LCD *lcd, const char *str) {
return count;
}
void lcd_move_to(LCD *lcd, int line, int col) {
void lcd_move_to(LCD *lcd, gpio_value_t line, gpio_value_t col) {
lcd_call(lcd, 0, col & 1, (col >> 1) & 1, (col >> 2) & 1,
(col >> 3) & 1, (col >> 4) & 1, (col >> 5) & 1, line, 1);
}
@ -114,15 +119,15 @@ void lcd_clear(LCD *lcd) {
lcd_call(lcd, 0, 1, 0, 0, 0, 0, 0, 0, 0);
}
void lcd_display_control(LCD *lcd, int b, int c, int d) {
void lcd_display_control(LCD *lcd, gpio_value_t b, gpio_value_t c, gpio_value_t d) {
lcd_call(lcd, 0, b, c, d, 1, 0, 0, 0, 0);
}
void lcd_entry_mode(LCD *lcd, int id, int s) {
void lcd_entry_mode(LCD *lcd, gpio_value_t id, gpio_value_t s) {
lcd_call(lcd, 0, s, id, 1, 0, 0, 0, 0, 0);
}
void lcd_cursor_shift(LCD *lcd, int sc, int rl) {
void lcd_cursor_shift(LCD *lcd, gpio_value_t sc, gpio_value_t rl) {
lcd_call(lcd, 0, 0, 0, rl, sc, 1, 0, 0, 0);
}

44
lcd.h
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@ -17,31 +17,32 @@
typedef struct {
gpio_handle_t handle;
// pin numbers
int rs; // register select
int rw; // read-write
int en; // enable
int d0;
int d1;
int d2;
int d3;
int d4;
int d5;
int d6;
int d7;
gpio_pin_t rs; // register select
gpio_pin_t rw; // read-write
gpio_pin_t en; // enable
gpio_pin_t d0;
gpio_pin_t d1;
gpio_pin_t d2;
gpio_pin_t d3;
gpio_pin_t d4;
gpio_pin_t d5;
gpio_pin_t d6;
gpio_pin_t d7;
// internal use
// gpio_value_ternal use
bool is_read;
} LCD;
/*
* Allocate and initialize a new LCD object and return a pointer to it. HANDLE
* Allocate and initialize a new LCD object and return a pogpio_value_ter to it. HANDLE
* is a gpio_handle_t, each of the other arguments corresponds to the GPIO pin
* number that the given controller pin is connected to: "register select",
* "read-write", "enable", and data pins 0-7.
* Return: the newly created object.
*/
LCD *lcd_open(gpio_handle_t handle, int rs, int rw, int en, int d0, int d1,
int d2, int d3, int d4, int d5, int d6, int d7);
LCD *lcd_open(gpio_handle_t handle, gpio_pin_t rs, gpio_pin_t rw, gpio_pin_t en,
gpio_pin_t d0, gpio_pin_t d1, gpio_pin_t d2, gpio_pin_t d3,
gpio_pin_t d4, gpio_pin_t d5, gpio_pin_t d6, gpio_pin_t d7);
/*
* Close LCD by freeing any resources associated with it.
*/
@ -49,8 +50,9 @@ void lcd_close(LCD *lcd);
/*
* Call a single instruction on LCD. Each argument is the value of that pin.
*/
void lcd_call(LCD *lcd, int rs, int d0, int d1, int d2, int d3, int d4, int d5,
int d6, int d7);
void lcd_call(LCD *lcd, gpio_value_t rs, gpio_value_t d0, gpio_value_t d1,
gpio_value_t d2, gpio_value_t d3, gpio_value_t d4,
gpio_value_t d5, gpio_value_t d6, gpio_value_t d7);
/*
* Write character C to LCD.
*/
@ -65,7 +67,7 @@ size_t lcd_write_string(LCD *lcd, const char *str);
/*
* Move the cursor to COL on LINE, which both start from 0.
*/
void lcd_move_to(LCD *lcd, int line, int col);
void lcd_move_to(LCD *lcd, gpio_value_t line, gpio_value_t col);
/*
* Clear LCD and return the cursor to the top right.
@ -81,7 +83,7 @@ void lcd_clear(LCD *lcd);
/*
* Control B, cursor blink, C, cursor visibility, and D, display power for LCD.
*/
void lcd_display_control(LCD *lcd, int b, int c, int d);
void lcd_display_control(LCD *lcd, gpio_value_t b, gpio_value_t c, gpio_value_t d);
#define LCD_INCREMENT 1
#define LCD_DECREMENT 0
@ -92,12 +94,12 @@ void lcd_display_control(LCD *lcd, int b, int c, int d);
/*
* Control shift and increment for LCD.
*/
void lcd_entry_mode(LCD *lcd, int id, int s);
void lcd_entry_mode(LCD *lcd, gpio_value_t id, gpio_value_t s);
/*
* Control direction and shift/move for cursor for LCD.
*/
void lcd_cursor_shift(LCD *lcd, int sc, int rl);
void lcd_cursor_shift(LCD *lcd, gpio_value_t sc, gpio_value_t rl);
/*
* Return: weather the busy flag is set for LCD.

331
main.c
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@ -1,30 +1,327 @@
/*
* main.c - Program entry and argument handling
* 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 "lcd.h"
#include "util.h"
#include "ths.h"
#include <unistd.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <sys/sysctl.h>
#include <string.h>
#include <figpar.h>
#include <inttypes.h>
#include <ctype.h>
#include <sys/sysctl.h>
#include <time.h>
#include <unistd.h>
#define RS 2
#define RW 3
#define EN 4
#define D0 17
#define D1 27
#define D2 22
#define D3 10
#define D4 9
#define D5 14
#define D6 15
#define D7 18
/*
* Print help message to standard output.
*/
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);
int main(int argc, const char **argv) {
gpio_handle_t handle = gpio_open(0);
int main(int argc, char *const *argv) {
parse_arguments(argc, argv);
parse_config_file(GLOBAL_OPTS.config_path);
gpio_handle_t handle = gpio_open_device(GLOBAL_OPTS.gpio_path);
if (handle == GPIO_INVALID_HANDLE) {
errx(1, "count not open GPIO handle!");
err(1, "could not open GPIO device \"%s\"", GLOBAL_OPTS.gpio_path);
}
LCD *lcd = lcd_open(handle, RS, RW, EN, D0, D1, D2, D3, D4, D5, D6, D7);
lcd_write_string(lcd, "This is a test");
LOG_VERBOSE("Opened GPIO device: \"%s\"\n", GLOBAL_OPTS.gpio_path);
LCD *lcd = lcd_open(handle, GLOBAL_OPTS.rs_pin, GLOBAL_OPTS.rw_pin,
GLOBAL_OPTS.en_pin, GLOBAL_OPTS.data_pins[0],
GLOBAL_OPTS.data_pins[1], GLOBAL_OPTS.data_pins[2],
GLOBAL_OPTS.data_pins[3], GLOBAL_OPTS.data_pins[4],
GLOBAL_OPTS.data_pins[5], GLOBAL_OPTS.data_pins[6],
GLOBAL_OPTS.data_pins[7]);
lcd_display_control(lcd, LCD_CURSOR_BLINK, LCD_CURSOR_ON, LCD_DISPLAY_ON);
THS *ths = ths_open(GLOBAL_OPTS.temp_key, GLOBAL_OPTS.humid_key,
GLOBAL_OPTS.fail_key);
while (true) {
if (ths_read_fails(ths) > GLOBAL_OPTS.fail_limit) {
errx(1, "THS fail limit reached");
}
lcd_clear(lcd);
lcd_write_string(lcd, "temp humi time");
char buff[17];
int cur_len = snprintf(buff, sizeof(buff), "%4.1fF %3" PRIu32 "%% ",
DK_TO_F(ths_read_temp(ths)), ths_read_humid(ths));
time_t it = time(NULL);
struct tm lt;
localtime_r(&it, &lt);
strftime(buff + cur_len, sizeof(buff) - cur_len,
"%H:%M", &lt);
lcd_move_to(lcd, 1, 0);
lcd_write_string(lcd, "FreeBSD!");
lcd_write_string(lcd, buff);
usleep(1000 * 1000 * 5);
}
lcd_close(lcd);
gpio_close(handle);
cleanup_options(&GLOBAL_OPTS);
return 0;
}
void print_help(const char *exec_name) {
printf("usage: %s [-h] [-v] [-s] [-f CONFIG_PATH]", exec_name);
}
void parse_arguments(int argc, char *const *argv) {
int c;
while ((c = getopt(argc, argv, "hf:vs")) != -1) {
switch (c) {
case 'h':
print_help(argv[0]);
exit(0);
case 'f':
FREE_CHECKED(GLOBAL_OPTS.config_path);
GLOBAL_OPTS.config_path = optarg;
LOG_VERBOSE("Config file path set: \"%s\"\n", optarg);
break;
case 's':
GLOBAL_OPTS.strict_config = true;
LOG_VERBOSE("Strict config mode enabled\n");
break;
case 'v':
GLOBAL_OPTS.verbose = true;
LOG_VERBOSE("Verbose mode enabled\n");
break;
case '?':
default:
print_help(argv[0]);
exit(1);
}
}
if (!GLOBAL_OPTS.config_path) {
GLOBAL_OPTS.config_path = strdup_checked(DEFAULT_CONFIG_PATH);
LOG_VERBOSE("Config file path set: \"%s\"\n", GLOBAL_OPTS.config_path);
}
}
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;
}
#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 = 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 = 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 = 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.lcd_version = entries[9].value.str;
LOG_VERBOSE("Using lcd_version: \"%s\"\n", GLOBAL_OPTS.lcd_version);
}
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_checked(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_checked(DEFAULT_TEMP_KEY)},
},
{
.directive = "humid_key",
.type = FIGPAR_TYPE_STR,
.action = parse_str_callback,
.value = {.str = strdup_checked(DEFAULT_HUMID_KEY)},
},
{
.directive = "fail_key",
.type = FIGPAR_TYPE_STR,
.action = parse_str_callback,
.value = {.str = strdup_checked(DEFAULT_FAIL_KEY)},
},
{
.directive = "fail_limit",
.type = FIGPAR_TYPE_UINT,
.action = parse_uint_callback,
.value = {.u_num = DEFAULT_FAIL_LIMIT},
},
{
.directive = "lcd_version",
.type = FIGPAR_TYPE_STR,
.action = parse_str_callback,
.value = {.str = strdup_checked(DEFAULT_LCD_VERSION)},
},
{ .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");
}

107
ths.c Normal file
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@ -0,0 +1,107 @@
/*
* ths.c - Utilities for reading sysctl based temp. and humidity sensors
* 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 "ths.h"
#include "util.h"
#include <err.h>
#include <sys/sysctl.h>
#include <inttypes.h>
THS *ths_open(const char *temp_key, const char *humid_key, const char *fail_key) {
THS *ths = malloc_checked(sizeof(THS));
if (temp_key) {
ths->temp_mib_len = THS_MIB_BUF_SIZE;
if (sysctlnametomib(temp_key, ths->temp_mib, &ths->temp_mib_len) < 0) {
warn("could not look up temp. key name: \"%s\"", temp_key);
free(ths);
return NULL;
}
} else {
ths->temp_mib_len = 0;
}
if (humid_key) {
ths->humid_mib_len = THS_MIB_BUF_SIZE;
if (sysctlnametomib(humid_key, ths->humid_mib, &ths->humid_mib_len) < 0) {
warn("could not look up humid. key name: \"%s\"", humid_key);
free(ths);
return NULL;
}
} else {
ths->humid_mib_len = 0;
}
if (fail_key) {
ths->fail_mib_len = THS_MIB_BUF_SIZE;
if (sysctlnametomib(fail_key, ths->fail_mib, &ths->fail_mib_len) < 0) {
warn("could not look up fail key name: \"%s\"", fail_key);
free(ths);
return NULL;
}
} else {
ths->fail_mib_len = 0;
}
LOG_VERBOSE("Opened THS with temp. key: \"%s\"\n"
" humid. key: \"%s\"\n"
" fail key: \"%s\"\n",
temp_key, humid_key, fail_key);
return ths;
}
void ths_close(THS *ths) {
free(ths);
}
int32_t ths_read_fails(const THS *ths) {
if (!ths->fail_mib_len) {
warnx("THS sensor does not support reading failure count");
return -1;
}
uint32_t ret_buf;
size_t ret_buf_size = sizeof(uint32_t);
if (sysctl(ths->fail_mib, ths->fail_mib_len, &ret_buf,
&ret_buf_size, NULL, 0) < 0) {
warn("could not read THS fail count");
return -1;
}
if (ret_buf > 0) {
LOG_VERBOSE("THS sensor reported: %" PRIu32 " fails\n", ret_buf)
}
return ret_buf;
}
int32_t ths_read_temp(const THS *ths) {
if (!ths->temp_mib_len) {
warnx("THS sensor does not support reading temperature");
return -1;
}
uint32_t ret_buf;
size_t ret_buf_size = sizeof(uint32_t);
if (sysctl(ths->temp_mib, ths->temp_mib_len, &ret_buf,
&ret_buf_size, NULL, 0) < 0) {
warn("could not read THS temperature");
return -1;
}
return ret_buf;
}
int32_t ths_read_humid(const THS *ths) {
if (!ths->humid_mib_len) {
warnx("THS sensor does not support reading humidity");
return -1;
}
uint32_t ret_buf;
size_t ret_buf_size = sizeof(uint32_t);
if (sysctl(ths->humid_mib, ths->humid_mib_len, &ret_buf,
&ret_buf_size, NULL, 0) < 0) {
warn("could not read THS humidity");
return -1;
}
return ret_buf;
}

65
ths.h Normal file
View File

@ -0,0 +1,65 @@
/*
* ths.h - Utilities for reading sysctl based temp. and humidity sensors
* 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_THS_H
#define INCLUDED_THS_H
#include <stdint.h>
#include <stddef.h>
#define THS_MIB_BUF_SIZE 8
typedef struct {
size_t temp_mib_len;
int temp_mib[THS_MIB_BUF_SIZE];
size_t humid_mib_len;
int humid_mib[THS_MIB_BUF_SIZE];
size_t fail_mib_len;
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.
*/
THS *ths_open(const char *temp_key, const char *humid_key, const char *fail_key);
/*
* Close THS.
*/
void ths_close(THS *ths);
/*
* Read the fail cound of THS.
* Return: the value read, or -1 on error
*/
int32_t ths_read_fails(const THS *ths);
/*
* Read the temperature of THS in deciKelvin.
* Return: the value read, or -1 on error
*/
int32_t ths_read_temp(const THS *ths);
/*
* Read the relative humidity of THS as an integer percentage.
* Return: the value read, or -1 on error
*/
int32_t ths_read_humid(const THS *ths);
#endif

19
util.c
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@ -10,11 +10,14 @@
#include "util.h"
#include <err.h>
#include <string.h>
struct GlobalFlags GLOBAL_FLAGS = {
.config_path = NULL,
.gpio_path = NULL,
};
Options GLOBAL_OPTS;
void cleanup_options(Options *opts) {
FREE_CHECKED(opts->config_path);
FREE_CHECKED(opts->gpio_path);
}
void *malloc_checked(size_t n) {
return realloc_checked(NULL, n);
@ -27,3 +30,11 @@ void *realloc_checked(void *old_ptr, size_t n) {
}
return ptr;
}
void *strdup_checked(const char *str) {
char *new_str = strdup(str);
if (!new_str) {
errx(1, "out of memory!");
}
return new_str;
}

49
util.h
View File

@ -11,12 +11,35 @@
#define INCLUDED_UTIL_H
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <time.h>
#include <stdbool.h>
#include <sys/types.h>
#include <libgpio.h>
struct GlobalFlags {
const char *config_path; // path to config file
const char *gpio_path; // path of GPIO device file to use
};
extern struct GlobalFlags GLOBAL_FLAGS;
typedef struct {
char *config_path; // path to config file
bool strict_config; // exit if unknown config options is found
bool verbose; // be more verbose
char *gpio_path; // path of GPIO device file to use
gpio_pin_t en_pin;
gpio_pin_t rs_pin;
gpio_pin_t rw_pin;
gpio_pin_t data_pins[8];
char *lcd_version; // Is LCD jp or eu
char *temp_key; // sysctl key for temperature
char *humid_key; // sysctl key for humidity
char *fail_key; // sysctl key for number of fails
uint32_t fail_limit; // limit for number of failures before exit
} Options;
extern Options GLOBAL_OPTS;
/*
* Cleanup an Options struct.
*/
void cleanup_options(Options *opts);
/*
* Like malloc(3), except that if allocation fails, an error will be written to
@ -30,4 +53,20 @@ void *malloc_checked(size_t n);
*/
void *realloc_checked(void *old_ptr, size_t n);
/*
* Like strdup(3), except that if allocation fails, an error will be written to
* standard error and abort(3) called
*/
void *strdup_checked(const char *str);
/*
* Like free(3), but do nothing if P is NULL.
*/
#define FREE_CHECKED(p) if (p) {free(p);}
/*
* Call fprintf(3) to stderr only if verbose mode was enabled.
*/
#define LOG_VERBOSE(...) if (GLOBAL_OPTS.verbose) {fprintf(stderr, __VA_ARGS__);}
#endif