Tarefa 3.3: Daemon - Controle do Backlight e Servico Systemd

.gitignore

@@ -1,2 +1,7 @@
 smartlamp-brightnessd/
 tasks-daemon-2026/
+.probe_2025*
+probe_2025*
+.*.cmd
+Module.symvers
+modules.order

daemon-2026-base/brightnessd_3_2.c

@@ -33,13 +33,35 @@ static int read_int_file(const char *path, int *value)
     // Retorne 0 em caso de sucesso ou um codigo negativo em caso de erro.
     (void)path;
     (void)value;
+
+    FILE *ftpr = fopen(path,"r");
+
+    if(ftpr == NULL) {
+        return -ENOSYS;
+    }
+
+    int found = fscanf(ftpr,"%i",value);
+    fclose(ftpr);
+    if(found > 0) {
+        return 0;
+    }
+
     return -ENOSYS;
 }
 
 static int ldr_to_percent(int ldr)
 {
     // TASK 3.2: limite o LDR para 0-100 e aplique um brilho minimo.
     (void)ldr;
+
+    if(ldr > MIN_PERCENT && ldr <= 100){
+        return ldr;
+    }
+
+    if(ldr > 100) {
+        return 100;
+    }
+
     return MIN_PERCENT;
 }
 

daemon-2026-base/brightnessd_3_3.c

@@ -14,7 +14,8 @@
 
 static volatile sig_atomic_t running = 1;
 
-struct config {
+struct config
+{
     const char *ldr_path;
     const char *backlight_path;
     int interval_ms;
@@ -40,6 +41,21 @@ static int read_int_file(const char *path, int *value)
     // TASK 3.3: reaproveite a implementacao da task 3.2.
     (void)path;
     (void)value;
+
+    FILE *ftpr = fopen(path, "r");
+
+    if (ftpr == NULL)
+    {
+        return -ENOSYS;
+    }
+
+    int found = fscanf(ftpr, "%i", value);
+    fclose(ftpr);
+    if (found > 0)
+    {
+        return 0;
+    }
+
     return -ENOSYS;
 }
 
@@ -49,6 +65,22 @@ static int __attribute__((unused)) write_int_file(const char *path, int value)
     // Use essa funcao para atualizar o brilho real da tela.
     (void)path;
     (void)value;
+
+    FILE *ftpr = fopen(path, "w");
+
+    if (ftpr == NULL)
+    {
+        return -ENOSYS;
+    }
+
+    int found = fprintf(ftpr, "%i", value);
+
+    fclose(ftpr);
+    if (found > 0)
+    {
+        return 0;
+    }
+
     return -ENOSYS;
 }
 
@@ -61,6 +93,14 @@ static int ldr_to_brightness(int ldr, int max_brightness)
     percent = MIN_PERCENT;
     (void)ldr;
     (void)max_brightness;
+    int comparison = ldr * (max_brightness / 100);
+
+    if (comparison < percent)
+    {
+        return percent;
+    }
+    percent = comparison;
+
     return percent;
 }
 
@@ -71,16 +111,19 @@ static void sleep_ms(int milliseconds)
     request.tv_sec = milliseconds / 1000;
     request.tv_nsec = (long)(milliseconds % 1000) * 1000000L;
 
-    while (running && nanosleep(&request, &request) == -1 && errno == EINTR) {
+    while (running && nanosleep(&request, &request) == -1 && errno == EINTR)
+    {
     }
 }
 
 static int parse_args(int argc, char **argv, struct config *config)
 {
     int opt;
 
-    while ((opt = getopt(argc, argv, "l:b:i:h")) != -1) {
-        switch (opt) {
+    while ((opt = getopt(argc, argv, "l:b:i:h")) != -1)
+    {
+        switch (opt)
+        {
         case 'l':
             config->ldr_path = optarg;
             break;
@@ -123,22 +166,31 @@ int main(int argc, char **argv)
     signal(SIGINT, handle_signal);
     signal(SIGTERM, handle_signal);
 
-    if (read_int_file(max_path, &max_brightness) < 0 || max_brightness <= 0) {
+    if (read_int_file(max_path, &max_brightness) < 0 || max_brightness <= 0)
+    {
         fprintf(stderr, "failed to read %s\n", max_path);
         return EXIT_FAILURE;
     }
 
-    while (running) {
+    while (running)
+    {
         int ldr;
         int brightness;
 
-        if (read_int_file(config.ldr_path, &ldr) == 0) {
+        if (read_int_file(config.ldr_path, &ldr) == 0)
+        {
             brightness = ldr_to_brightness(ldr, max_brightness);
 
             // TASK 3.3: escreva brightness em brightness_path usando write_int_file().
+            if (write_int_file(brightness_path, brightness) != 0)
+            {
+                return EXIT_FAILURE;
+            }
             printf("ldr=%d brightness=%d max_brightness=%d\n", ldr, brightness, max_brightness);
             fflush(stdout);
-        } else {
+        }
+        else
+        {
             fprintf(stderr, "failed to read %s\n", config.ldr_path);
         }
 

esp32/.gitignore

@@ -0,0 +1,5 @@
+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

esp32/.vscode/extensions.json

@@ -0,0 +1,10 @@
+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ],
+    "unwantedRecommendations": [
+        "ms-vscode.cpptools-extension-pack"
+    ]
+}

esp32/include/README

@@ -0,0 +1,37 @@
+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the convention is to give header files names that end with `.h'.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

esp32/lib/README

@@ -0,0 +1,46 @@
+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into the executable file.
+
+The source code of each library should be placed in a separate directory
+("lib/your_library_name/[Code]").
+
+For example, see the structure of the following example libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional. for custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+Example contents of `src/main.c` using Foo and Bar:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+The PlatformIO Library Dependency Finder will find automatically dependent
+libraries by scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html

esp32/platformio.ini

@@ -0,0 +1,16 @@
+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:esp32dev]
+platform = espressif32
+board = esp32dev
+framework = arduino
+upload_speed = 115200
+monitor_speed = 115200