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--- pm:prj2026:bianca.popa1106:stefan.lupoi [2026/05/06 21:22]
stefan.lupoi
+++ pm:prj2026:bianca.popa1106:stefan.lupoi [2026/05/19 21:39] (current)
stefan.lupoi
@@ Line 20: / Line 20: @@
   - **User Input (PS/2 Keyboard and Custom Driver)**
-    * //Hardware:// Signals that are coming from the keyboard (5V) go through a logic level converter to protect the ESP32 (3.3V).
+    * //Hardware:// Signals that are coming from the keyboard (5V) go through resistors to protect the ESP32 (3.3V).
     * //Software:// The ISR listens to the CLK pin of the keyboard and receives the data bits at every negedge cycle. The scan codes are decoded and inserted into a buffer.
   - **Data Reading (Sensors and Timers)**
@@ Line 34: / Line 34: @@
   * **Display:** TFT SPI 2.4 inch display module 240x320 resolution
   * **Input:** Standard PS/2 keyboard and female PS/2 connector (modified extension cable)
-  * **Logic Level Converter:** Bidirectional logic level converter - 4 channels (5V <-> 3.3V)
   * **Non-volatile Memory:** EEPROM I2C AT24C256 (32K)
   * **Digital Sensors:** BMP180 (I2C) pressure and temperature sensor
   * **Analog Sensors:** Photoresistor (type 5528) + 10kΩ resistor (voltage divider), 10kΩ potentiometer
+  * **Resistors**: 1kΩ and 10kΩ resistors
+  * **Transistor**: BC547B NPN transistor
   * **Infrastructure:** Breadboard and wires (female-male, male-male)
   * **Power:** TBD
@@ Line 44: / Line 45: @@
 {{ :pm:prj2026:bianca.popa1106:electrical_diagram_lupoi_stefan-alexandru.png?direct&&800 |}}
-<note tip>
-Aici puneţi tot ce ţine de hardware design:
-  * listă de piese
-  * scheme electrice (se pot lua şi de pe Internet şi din datasheet-uri, e.g. http://www.captain.at/electronic-atmega16-mmc-schematic.png)
-  * diagrame de semnal
-  * rezultatele simulării
-</note>
 ===== Software Design =====
+**IDE:**
+  * **PlatformIO** (typically used as an extension within Visual Studio Code). The build environment is configured via ''platformio.ini'' utilizing the Arduino framework for the ESP32 (''espressif32'' platform).
-<note tip>
+**Libraries and 3rd Party Resources:**
-Descrierea codului aplicaţiei (firmware):
+  * **TFT_eSPI (by Bodmer, v2.5.43):** A high-performance, hardware-accelerated graphics library specifically configured for driving the ST7789 TFT display over high-speed SPI.
-  * mediu de dezvoltare (if any) (e.g. AVR Studio, CodeVisionAVR)
+  * **LVGL (Light and Versatile Graphics Library, v9.1.0):** The core UI framework powering the graphical elements, including the interactive menus, the terminal overlay, and the real-time data charting system.
-  * librării şi surse 3rd-party (e.g. Procyon AVRlib)
+  * **Adafruit BMP085 Library:** Used for interfacing with the BMP180 sensor over I2C to gather atmospheric pressure and temperature data.
-  * algoritmi şi structuri pe care plănuiţi să le implementaţi
+  * **EEPROM / Wire (Standard ESP32 Arduino Core):** Used for non-volatile storage of recorded data and managing I2C hardware communication, respectively.
-  * (etapa 3) surse şi funcţii implementate
+  * //(Note: Adafruit GFX and Adafruit ST7789 libraries are included in dependencies for legacy support but superseded by TFT_eSPI/LVGL in the active application).//
-</note>
+**Algorithms and Data Structures Used (or Planned):**
+  * **Linear Data Buffer (Struct Array):** A static array ''data_buffer[MAX_SAMPLES]'' consisting of custom ''SensorSnapshot'' structs. It stores aggregated sensor payloads (timestamp, potentiometer, light, temperature, pressure). Capped at 250 samples to perfectly fit within the ESP32's 4KB EEPROM limit.
+  * **Circular Buffer (Ring Buffer):** Used within the custom PS/2 keyboard driver (''_rawBuffer'') to safely enqueue raw, asynchronous hardware scan codes triggered by GPIO interrupts without blocking the main thread.
+  * **State Machines:**
+    * **Keyboard Decoding:** A state machine tracks modifier keys (Shift, Ctrl, Caps Lock, Extended codes) to accurately translate complex multi-byte PS/2 scan sequences into ASCII characters.
+    * **Application Flow Control:** An ''AppState'' enum (''STATE_INITIAL'', ''STATE_RUNNING'', ''STATE_INSPECT'') dictates the high-level system behavior, preventing invalid actions like zooming while actively recording data.
+  * **Data Windowing and Mapping Algorithms:** The graphing engine (''update_chart_source'') calculates visible data slices using dynamic array indexing offsets (''pan_offset'') and active time windows (''scale_x_window''). It dynamically remaps sensor data into the display's visual space to accomplish real-time panning and zooming.
+**Sources and Implemented Functions:**
+  * **''main.cpp'':** The system orchestrator. Initializes the hardware peripherals, bridges LVGL with the display (''my_disp_flush'') and the keyboard driver (''keypad_read_cb''), maps keyboard shortcuts to system commands, and drives the main UI loop (''lv_timer_handler'').
+  * **''graph.cpp'' / ''graph.h'':** Manages the LVGL charting subsystem, data acquisition, and EEPROM state persistence.
+    * //Key functions:// ''init_graph()'', ''recording_task()'', ''update_chart_source()'', ''cmd_start_recording()'', ''cmd_zoom()'', ''cmd_pan()'', ''cmd_save()'', ''cmd_load()''.
+  * **''terminal.cpp'' / ''terminal.h'':** Implements the graphical terminal overlay and its text parser, allowing users to type and execute commands that interface with the graphing logic.
+    * //Key functions:// ''init_terminal_ui()'', ''toggle_terminal()''.
+  * **''menu.cpp'' / ''menu.h'':** Controls the GUI-based settings menu for intuitive user configuration using LVGL components.
+    * //Key functions:// ''init_menu()'', ''toggle_menu()''.
+  * **''ps2_keyboard.cpp'' / ''ps2_keyboard.h'':** A bare-metal PS/2 keyboard driver utilizing hardware interrupts to capture user inputs.
+    * //Key functions:// ''begin()'', ''read()'', ''handleInterrupt()''.
 ===== Rezultate Obţinute =====
@@ Line 73: / Line 86: @@
 ===== Download =====
+  * [[https://github.com/SaboJake/ESP32-Data-Logger-and-Graphing-Terminal|github]]
-<note warning>
-O arhivă (sau mai multe dacă este cazul) cu fişierele obţinute în urma realizării proiectului: surse, scheme, etc. Un fişier README, un ChangeLog, un script de compilare şi copiere automată pe uC crează întotdeauna o impresie bună ;-).
-Fişierele se încarcă pe wiki folosind facilitatea **Add Images or other files**. Namespace-ul în care se încarcă fişierele este de tipul **:pm:prj20??:c?** sau **:pm:prj20??:c?:nume_student** (dacă este cazul). **Exemplu:** Dumitru Alin, 331CC -> **:pm:prj2009:cc:dumitru_alin**.
-</note>
 ===== Jurnal =====
+  * **06.05.2026:** Added introduction, general description and block and electrical diagrams.
-* **06.05.2026:** Added introduction, general description and block and electrical diagrams.
+  * **19.05.2026:** Added firmware, bibliography and resources. Updated electrical diagram and block diagram.
-<note tip>
-Puteți avea și o secțiune de jurnal în care să poată urmări asistentul de proiect progresul proiectului.
-</note>
 ===== Bibliografie/Resurse =====
+  * [[https://documentation.espressif.com/esp32-wroom-32d_esp32-wroom-32u_datasheet_en.pdf|Data sheet ESP32-WROOM-32D]]
-<note>
+  * [[https://ww1.microchip.com/downloads/en/DeviceDoc/doc0006.pdf|Data sheet AT24C256]]
-Listă cu documente, datasheet-uri, resurse Internet folosite, eventual grupate pe **Resurse Software** şi **Resurse Hardware**.
+  * [[https://cdn-shop.adafruit.com/datasheets/BST-BMP180-DS000-09.pdf|Data sheet BMP180]]
-</note>
+  * [[https://wiki.osdev.org/PS/2_Keyboard|Data sheet PS/2 keyboard]]
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