Zander671/rpi4b-temp-humidity
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Add menu system, fix Makefile

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This commit is contained in:
Alexander Rosenberg 2024-03-01 00:21:20 -08:00
parent 900243fb1c
commit 57974cc025
Signed by: school-rpi4
GPG Key ID: 5CCFC80B0B47B04B
11 changed files with 488 additions and 80 deletions
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5
.gitignore vendored
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@ -1,4 +1,5 @@
*.o
bin/
*.core
rpi4b-temp-humidity
compile_commands.json
.cache/
.cache/

26
Makefile
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@ -1,20 +1,22 @@
CC=clang
CFLAGS=-std=c99 -Wall
LD=clang
LDFLAGS=-lgpio -lfigpar
SRCS=src/main.c src/util.c src/lcd.c src/ths.c src/button.c
PROG=rpi4b-temp-humidity
# -*- mode: makefile -*-
.include "config.mk"
CC=clang
CFLAGS=-std=c11 -Wall ${SQLITE3_CFLAGS}
LD=clang
LDFLAGS=-lgpio -lfigpar -lpthread ${SQLITE3_LDFLAGS}
SRCS=src/main.c src/util.c src/lcd.c src/ths.c src/button.c src/screen.c
PROG=rpi4b-temp-humidity
OBJS=${SRCS:C/^src/bin/:C/.c$/.o/}
bin/${PROG}: ${OBJS}
${LD} ${LDFLAGS} -o ${@} ${OBJS}
main.o util.o lcd.o ths.o button.o: util.h
main.o lcd.o: lcd.h
main.o ths.o: ths.h
main.o button.o: button.h
bin/main.o bin/util.o bin/lcd.o bin/ths.o bin/button.o bin/screen.o: src/util.h
bin/main.o bin/lcd.o bin/screen.o: src/lcd.h
bin/main.o bin/ths.o bin/screen.o: src/ths.h
bin/main.o bin/button.o bin/screen.o: src/button.h
bin/main.o bin/screen.o: src/screen.h
${OBJS}: ${.TARGET:C/^bin/src/:C/.o$/.c/}
@mkdir -p bin/
@ -27,7 +29,7 @@ ${OBJS}: ${.TARGET:C/^bin/src/:C/.o$/.c/}
-DDEFAULT_FAIL_LIMIT="${DEFAULT_FAIL_LIMIT}"\
-DDEFAULT_LCD_VERSION="\"${DEFAULT_LCD_VERSION}\""\
-DDEFAULT_REFRESH_TIME="${DEFAULT_REFRESH_TIME}"\
-o ${@} ${.ALLSRC}
-o ${@} ${.TARGET:C/^bin/src/:C/.o$/.c/}
clean:
rm -rf bin/

5
config.mk
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@ -1,3 +1,8 @@
# Library and compile options
SQLITE3_LDFLAGS=-L/usr/local/lib -lsqlite3
SQLITE3_CFLAGS=-I/usr/local/include
# Default option values, empty means NULL (for strings)
DEFAULT_CONFIG_PATH=config.conf
DEFAULT_GPIO_DEVICE=/dev/gpioc0
DEFAULT_TEMP_KEY=dev.gpioths.0.temperature

13
src/button.c
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@ -17,8 +17,7 @@ static const struct timespec DEBOUNCE_TIME = {
.tv_nsec = 10 * 1000 * 1000, // 10ms
};
Button *button_new(gpio_handle_t handle, gpio_pin_t pin, ButtonAction action,
void *user_data) {
Button *button_new(gpio_handle_t handle, gpio_pin_t pin) {
Button *button = malloc_checked(sizeof(Button));
button->handle = handle;
button->pin = pin;
@ -27,8 +26,6 @@ Button *button_new(gpio_handle_t handle, gpio_pin_t pin, ButtonAction action,
.g_flags = GPIO_PIN_INPUT | GPIO_PIN_PULLUP,
};
gpio_pin_set_flags(handle, &cfg);
button->action = action;
button->user_data = user_data;
button->is_down = false;
timespecclear(&button->last_detect);
return button;
@ -38,7 +35,7 @@ void button_delete(Button *button) {
free(button);
}
int button_dispatch(Button *button) {
bool button_pressed(Button *button) {
struct timespec cur_time, diff_time;
clock_gettime(CLOCK_UPTIME, &cur_time);
timespecsub(&cur_time, &button->last_detect, &diff_time);
@ -47,13 +44,11 @@ int button_dispatch(Button *button) {
if (!button->is_down && status == GPIO_PIN_LOW) {
button->is_down = true;
button->last_detect= cur_time;
if (button->action) {
return button->action(button->user_data);
}
return true;
} else if (button->is_down && status == GPIO_PIN_HIGH) {
button->last_detect = cur_time;
button->is_down = false;
}
}
return 0;
return false;
}

18
src/button.h
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@ -14,13 +14,9 @@
#include <libgpio.h>
#include <stdbool.h>
typedef int(*ButtonAction)(void *);
typedef struct {
gpio_handle_t handle;
gpio_pin_t pin;
ButtonAction action;
void *user_data;
struct timespec last_detect;
bool is_down;
@ -28,24 +24,20 @@ typedef struct {
/*
* Create a Button object with the given HANDLE, PIN and ACTION. USER_DATA will
* be passed to ACTION every time it is run. It is up to the caller to free
* USER_DATA when the Button is freed.
* be passed to ACTION every time it is run.
* Return: the created Button.
*/
Button *button_new(gpio_handle_t uandle, gpio_pin_t pin, ButtonAction action,
void *user_data);
Button *button_new(gpio_handle_t handle, gpio_pin_t pin);
/*
* Delete BUTTON.
* NOTE: This does NOT free USER_DATA.
*/
void button_delete(Button *button);
/*
* Check if the pin for this button is HIGH, if it is, call ACTION and prevent
* it from being called again until button becomes LOW.
* Return: 0 if nothing is done, otherwise, the return value of ACTION.
* Return: true if BUTTON is down
*/
int button_dispatch(Button *button);
bool button_pressed(Button *button);
#endif

2
src/lcd.c
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@ -68,7 +68,7 @@ LCD *lcd_open(gpio_handle_t handle, gpio_pin_t rs, gpio_pin_t rw, gpio_pin_t en,
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,"
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;
}

216
src/main.c
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@ -11,6 +11,8 @@
#include "util.h"
#include "ths.h"
#include "button.h"
#include "menu.h"
#include "screen.h"
#include <unistd.h>
#include <err.h>
@ -23,6 +25,9 @@
#include <time.h>
#include <sys/time.h>
#include <unistd.h>
#include <pthread.h>
#include <stdatomic.h>
#include <signal.h>
/*
* Print help message to standard output.
@ -36,6 +41,33 @@ void parse_arguments(int argc, char *const *argv);
* Parse config file PATH.
*/
void parse_config_file(const char *path);
/*
* Read the temp. and humid., store it in the configured database, and output it
* to the given uint32_t pointers.
*/
void update_stats(THS *ths, struct timespec *cur_time);
/*
* Setup signals used to ensure clean termination.
*/
void setup_signals(void);
/*
* Start the thread used to update the temp. and humid. and record them.
*/
void start_update_thread(pthread_t *thread);
// cross thread variables
pthread_mutex_t STAT_MUTEX;
uint32_t LAST_TEMP, LAST_HUMID;
time_t LAST_READ_SEC;
_Atomic bool RUNNING = true;
/*
* Lock the cross thread variables above.
*/
void lock_stat_globals(void);
/*
* Unlock the cross thread variables above.
*/
#define unlock_stat_globals() pthread_mutex_unlock(&STAT_MUTEX)
int main(int argc, char *const *argv) {
parse_arguments(argc, argv);
@ -52,54 +84,38 @@ int main(int argc, char *const *argv) {
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);
if (!GLOBAL_OPTS.fail_key) {
warnx("it's probably a bad idea to not set fail_key");
}
struct timespec last_update, cur_time, diff_time;
timespecclear(&last_update);
struct timespec refresh_time = {
.tv_sec = GLOBAL_OPTS.refresh_time / 1000,
.tv_nsec = (GLOBAL_OPTS.refresh_time % 1000) * 1000 * 1000,
};
Button *btn = button_new(handle, 23, (ButtonAction) printf, "Button Pressed!\n");
while (true) {
clock_gettime(CLOCK_UPTIME, &cur_time);
timespecsub(&cur_time, &last_update, &diff_time);
if (timespeccmp(&diff_time, &refresh_time, >=)) {
if (GLOBAL_OPTS.fail_key && 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));
struct tm lt;
localtime_r(&cur_time.tv_sec, &lt);
strftime(buff + cur_len, sizeof(buff) - cur_len,
"%H:%M", &lt);
lcd_move_to(lcd, 1, 0);
lcd_write_string(lcd, buff);
LOG_VERBOSE("Temp. and humid. display updated\n");
last_update = cur_time;
}
button_dispatch(btn);
setup_signals();
pthread_t bg_update;
start_update_thread(&bg_update);
ScreenManager *screen_manager = screen_manager_new(lcd, handle,
GLOBAL_OPTS.back_pin,
GLOBAL_OPTS.up_pin,
GLOBAL_OPTS.down_pin,
GLOBAL_OPTS.sel_pin);
screen_manager_add(screen_manager, (Screen *) stats_screen_new());
while (RUNNING) {
lock_stat_globals();
uint32_t temp = LAST_TEMP;
uint32_t humid = LAST_HUMID;
unlock_stat_globals();
screen_manager_dispatch(screen_manager, temp, humid);
// 10ms is probably faster than anyone will press a button
usleep(10 * 1000);
}
button_delete(btn);
ths_close(ths);
screen_manager_delete(screen_manager);
lcd_close(lcd);
if (pthread_join(bg_update, NULL) != 0) {
err(1, "join of background thread failed");
}
// this needs to be done after bg_update exits
pthread_mutex_destroy(&STAT_MUTEX);
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]\n", exec_name);
printf("usage: %s [-h] [-vs] [-f CONFIG_PATH]\n", exec_name);
}
void parse_arguments(int argc, char *const *argv) {
@ -269,6 +285,25 @@ static void set_options_from_entries(struct figpar_config *entries,
LOG_VERBOSE("Using lcd_version: \"%s\"\n", GLOBAL_OPTS.lcd_version);
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) {
@ -278,7 +313,7 @@ void parse_config_file(const char *path) {
.directive = "gpio_file",
.type = FIGPAR_TYPE_STR,
.action = parse_str_callback,
.value = {.str = strdup_checked(DEFAULT_GPIO_DEVICE)},
.value = {.str = strdup_default_opt(DEFAULT_GPIO_DEVICE)},
},
{
.directive = "rs_pin",
@ -304,19 +339,19 @@ void parse_config_file(const char *path) {
.directive = "temp_key",
.type = FIGPAR_TYPE_STR,
.action = parse_str_callback,
.value = {.str = strdup_checked(DEFAULT_TEMP_KEY)},
.value = {.str = strdup_default_opt(DEFAULT_TEMP_KEY)},
},
{
.directive = "humid_key",
.type = FIGPAR_TYPE_STR,
.action = parse_str_callback,
.value = {.str = strdup_checked(DEFAULT_HUMID_KEY)},
.value = {.str = strdup_default_opt(DEFAULT_HUMID_KEY)},
},
{
.directive = "fail_key",
.type = FIGPAR_TYPE_STR,
.action = parse_str_callback,
.value = {.str = strdup_checked(DEFAULT_FAIL_KEY)},
.value = {.str = strdup_default_opt(DEFAULT_FAIL_KEY)},
},
{
.directive = "fail_limit",
@ -328,7 +363,7 @@ void parse_config_file(const char *path) {
.directive = "lcd_version",
.type = FIGPAR_TYPE_STR,
.action = parse_str_callback,
.value = {.str = strdup_checked(DEFAULT_LCD_VERSION)},
.value = {.str = strdup_default_opt(DEFAULT_LCD_VERSION)},
},
{
.directive = "refresh_time",
@ -336,6 +371,26 @@ void parse_config_file(const char *path) {
.action = parse_uint_callback,
.value = {.u_num = DEFAULT_REFRESH_TIME},
},
{
.directive = "sel_pin",
.type = FIGPAR_TYPE_NONE,
.action = parse_uint_callback,
},
{
.directive = "down_pin",
.type = FIGPAR_TYPE_NONE,
.action = parse_uint_callback,
},
{
.directive = "up_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);
@ -362,3 +417,78 @@ void parse_config_file(const char *path) {
}
LOG_VERBOSE("Finished loading config file\n");
}
static void exit_signal_callback(int sig) {
LOG_VERBOSE("Caught signal %d. Exiting...\n", sig);
RUNNING = false;
}
#define SIGNAL_SETUP_CHECKED(sig) \
if (signal(sig, exit_signal_callback) == SIG_ERR) {\
err(1, "failed to setup signal %s", #sig);\
}
void setup_signals() {
SIGNAL_SETUP_CHECKED(SIGTERM);
SIGNAL_SETUP_CHECKED(SIGINT);
}
void update_stats(THS *ths, struct timespec *cur_time) {
if (GLOBAL_OPTS.fail_key && ths_read_fails(ths) > GLOBAL_OPTS.fail_limit) {
errx(1, "THS fail limit reached");
}
uint32_t temp = ths_read_temp(ths);
uint32_t humid = ths_read_humid(ths);
LOG_VERBOSE("Temp. and humid. read\n");
// TODO store in database
lock_stat_globals();
LAST_TEMP = temp;
LAST_HUMID = humid;
LAST_READ_SEC = cur_time->tv_sec;
unlock_stat_globals();
}
static void *update_thread_action(void *_ignored) {
sigset_t to_block;
sigemptyset(&to_block);
sigaddset(&to_block, SIGTERM);
sigaddset(&to_block, SIGINT);
if (pthread_sigmask(SIG_BLOCK, &to_block, NULL) != 0) {
err(1, "failed to set background thread signal mask");
}
THS *ths = ths_open(GLOBAL_OPTS.temp_key, GLOBAL_OPTS.humid_key,
GLOBAL_OPTS.fail_key);
struct timespec last_update, cur_time, diff_time;
timespecclear(&last_update);
struct timespec refresh_time = {
.tv_sec = GLOBAL_OPTS.refresh_time / 1000,
.tv_nsec = (GLOBAL_OPTS.refresh_time % 1000) * 1000 * 1000,
};
while (RUNNING) {
clock_gettime(CLOCK_UPTIME, &cur_time);
timespecsub(&cur_time, &last_update, &diff_time);
if (timespeccmp(&diff_time, &refresh_time, >=)) {
update_stats(ths, &cur_time);
last_update = cur_time;
}
usleep(10 * 1000); // 10ms, a reasonable delay
}
ths_close(ths);
return NULL;
}
void start_update_thread(pthread_t *thread) {
if (pthread_mutex_init(&STAT_MUTEX, NULL) != 0) {
err(1, "could not create mutex");
}
if (pthread_create(thread, NULL, &update_thread_action, NULL) != 0) {
err(1, "could not create backgroup update thread");
}
LOG_VERBOSE("Created background update thread\n");
}
void lock_stat_globals() {
if (pthread_mutex_lock(&STAT_MUTEX) != 0) {
err(1, "trying to lock mutex reported an error");
}
}

170
src/screen.c Normal file
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@ -0,0 +1,170 @@
/*
* screen.c - Simple menu system
* 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 "screen.h"
#include "util.h"
#include "ths.h"
#include <err.h>
#include <inttypes.h>
void screen_init(Screen *screen, const char *name,
ScreenDispatchFunc dispatch_func,
ScreenCleanupFunc cleanup_func) {
screen->dispatch_func = dispatch_func;
screen->cleanup_func = cleanup_func;
screen->name = strdup_checked(name);
}
void screen_delete(Screen *screen) {
FREE_CHECKED(screen->name);
if (screen->cleanup_func) {
screen->cleanup_func(screen);
}
}
ScreenManager *screen_manager_new(LCD *lcd, gpio_handle_t handle,
gpio_pin_t back_pin, gpio_pin_t up_pin,
gpio_pin_t down_pin, gpio_pin_t sel_pin) {
ScreenManager *sm = malloc_checked(sizeof(ScreenManager));
sm->lcd = lcd;
sm->screens = NULL;
sm->screen_count = 0;
sm->cur_scren = -1;
sm->up_btn = button_new(handle, up_pin);
sm->down_btn = button_new(handle, down_pin);
sm->back_btn = button_new(handle, back_pin);
sm->sel_btn = button_new(handle, sel_pin);
sm->cur_menu_line = 0;
sm->last_drawn_menu_line = 0;
sm->force_draw = true;
return sm;
}
void screen_manager_delete(ScreenManager *sm) {
for (size_t i = 0; i < sm->screen_count; ++i) {
screen_delete(sm->screens[i]);
}
FREE_CHECKED(sm->screens);
button_delete(sm->up_btn);
button_delete(sm->down_btn);
button_delete(sm->back_btn);
button_delete(sm->sel_btn);
free(sm);
}
void screen_manager_add(ScreenManager *sm, Screen *screen) {
sm->screens = realloc_checked(sm->screens,
sizeof(Screen *) * ++sm->screen_count);
sm->screens[sm->screen_count - 1] = screen;
}
static void screen_manager_dispatch_select_menu(ScreenManager *sm) {
if (button_pressed(sm->up_btn) && sm->cur_menu_line != 0) {
--sm->cur_menu_line;
}
if (button_pressed(sm->down_btn) && sm->cur_menu_line < sm->screen_count - 1) {
++sm->cur_menu_line;
}
// poll the button, but don't do anything with the state
button_pressed(sm->back_btn);
if (sm->cur_menu_line != sm->last_drawn_menu_line || sm->force_draw) {
sm->force_draw = false;
sm->last_drawn_menu_line = sm->cur_menu_line;
lcd_clear(sm->lcd);
lcd_move_to(sm->lcd, 0, 0);
if (sm->screen_count == 1) {
lcd_write_char(sm->lcd, '*');
lcd_write_string(sm->lcd, sm->screens[0]->name);
} else if (sm->cur_menu_line >= sm->screen_count - 1) {
lcd_write_char(sm->lcd, ' ');
lcd_write_string(sm->lcd, sm->screens[sm->screen_count - 2]->name);
lcd_move_to(sm->lcd, 1, 0);
lcd_write_char(sm->lcd, '*');
lcd_write_string(sm->lcd, sm->screens[sm->screen_count - 1]->name);
} else {
lcd_write_char(sm->lcd, '*');
lcd_write_string(sm->lcd, sm->screens[sm->cur_menu_line]->name);
lcd_move_to(sm->lcd, 1, 0);
lcd_write_char(sm->lcd, ' ');
lcd_write_string(sm->lcd, sm->screens[sm->cur_menu_line + 1]->name);
}
}
if (button_pressed(sm->sel_btn)) {
sm->cur_scren = sm->cur_menu_line;
sm->force_draw = true;
}
}
void screen_manager_dispatch(ScreenManager *sm, uint32_t temp, uint32_t humid) {
if (!sm->screen_count) {
errx(1, "attempt to display empty screen manager");
}
if (sm->cur_scren < 0) {
screen_manager_dispatch_select_menu(sm);
} else {
Screen *cs = sm->screens[sm->cur_scren];
if (cs->dispatch_func) {
SensorState state = {
.lcd = sm->lcd,
.temp = temp,
.humid = humid,
.back_down = button_pressed(sm->back_btn),
.up_down = button_pressed(sm->up_btn),
.down_down = button_pressed(sm->down_btn),
.sel_down = button_pressed(sm->sel_btn),
.force_draw = sm->force_draw,
};
if (cs->dispatch_func(cs, &state)) {
// if this is true, it means return to the main menu
sm->cur_scren = -1;
sm->force_draw = true;
} else {
sm->force_draw = false;
}
}
}
}
bool stats_screen_dispatch(StatsScreen *screen, SensorState *state) {
if (state->back_down) {
return true;
}
time_t cur_time = time(NULL);
if (state->force_draw || state->temp != screen->last_temp
|| state->humid != screen->last_humid
|| screen->last_min != cur_time / 60) {
screen->last_temp = state->temp;
screen->last_humid = state->humid;
screen->last_min = cur_time / 60;
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);
struct tm lt;
localtime_r(&cur_time, &lt);
strftime(buff + cur_len, sizeof(buff) - cur_len,
"%H:%M", &lt);
lcd_move_to(state->lcd, 1, 0);
lcd_write_string(state->lcd, buff);
}
return false;
}
StatsScreen *stats_screen_new() {
StatsScreen *s = malloc_checked(sizeof(StatsScreen));
screen_init(&s->parent, "Current Stats",
(ScreenDispatchFunc) stats_screen_dispatch,
(ScreenCleanupFunc) free);
s->last_humid = 0;
s->last_temp = 0;
return s;
}

104
src/screen.h Normal file
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@ -0,0 +1,104 @@
/*
* screen.h - Simple menu system
* 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_SCREEN_H
#define INCLUDED_SCREEN_H
#include "button.h"
#include "lcd.h"
#include <time.h>
#include <libgpio.h>
typedef struct {
LCD *lcd;
uint32_t temp;
uint32_t humid;
bool back_down;
bool up_down;
bool down_down;
bool sel_down;
bool force_draw;
} SensorState;
typedef struct _Screen Screen;
// should return true if we are to go back
typedef bool (*ScreenDispatchFunc)(Screen *, SensorState *);
typedef void (*ScreenCleanupFunc)(Screen *);
struct _Screen {
char *name;
ScreenDispatchFunc dispatch_func;
ScreenCleanupFunc cleanup_func;
};
/*
* Init Screen with NAME and the given callbacks.
* Return: the new Screen
*/
void screen_init(Screen *screen, const char *name,
ScreenDispatchFunc dispatch_func,
ScreenCleanupFunc cleanup_func);
/*
* Cleanup screen by calling its cleanup func and then freeing its name
*/
void screen_delete(Screen *screen);
typedef struct {
LCD *lcd;
Button *back_btn;
Button *up_btn;
Button *down_btn;
Button *sel_btn;
Screen **screens;
size_t screen_count;
// internal
ssize_t cur_scren;
size_t cur_menu_line;
size_t last_drawn_menu_line;
bool force_draw;
} ScreenManager;
/*
* Crate a new ScreenManager with the given LCD and buttons
* Return: the new ScreenManager
*/
ScreenManager *screen_manager_new(LCD *lcd, gpio_handle_t handle,
gpio_pin_t back_pin, gpio_pin_t up_pin,
gpio_pin_t down_pin, gpio_pin_t sel_pin);
/*
* Delete ScreenManager and the buttons it manages. This does NOT delete it's
* LCD.
*/
void screen_manager_delete(ScreenManager *sm);
/*
* Add SCREEN to SM.
*/
void screen_manager_add(ScreenManager *sm, Screen *screen);
/*
* Process input and, if needed, redraw the screen for ScreenManager. TEMP and
* HUMID should be the last values read by the connected THS.
*/
void screen_manager_dispatch(ScreenManager *sm, uint32_t temp, uint32_t humid);
typedef struct {
Screen parent;
uint32_t last_temp;
uint32_t last_humid;
time_t last_min;
} StatsScreen;
StatsScreen *stats_screen_new(void);
#endif

3
src/util.c
View File

@ -36,6 +36,9 @@ void *realloc_checked(void *old_ptr, size_t n) {
}
void *strdup_checked(const char *str) {
if (!str) {
return NULL;
}
char *new_str = strdup(str);
if (!new_str) {
errx(1, "out of memory!");

6
src/util.h
View File

@ -34,6 +34,12 @@ typedef struct {
char *fail_key; // sysctl key for number of fails
uint32_t fail_limit; // limit for number of failures before exit
uint32_t refresh_time; // time between temp and humid refresh
// menu navigation pins
gpio_pin_t up_pin;
gpio_pin_t down_pin;
gpio_pin_t back_pin;
gpio_pin_t sel_pin;
} Options;
extern Options GLOBAL_OPTS;