# GPIO Management rev_04

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    - Project: # GPIO Management
    - Source Code NOT compiled for: ESP32 DevKit V1
    - Source Code created on: 2026-02-20 04:36:12

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* Initialize ESP32 DevKit V1 with configurable GPIO */
    /* pins for digital I/O operations, ensuring proper */
    /* pin initialization and state management during */
    /* system startup and runtime. */
/****** END SYSTEM REQUIREMENTS *****/


/* START CODE */

// Include the GPIO configuration header file for type definitions and function declarations
#include "GPIOConfig.h"

// System Requirements:
// System Requirement 1: "Initialize ESP32 DevKit V1 with configurable GPIO pins for digital I/O operations,
// ensuring proper pin initialization and state management during system startup and runtime."

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);

/**
 * setup()
 * Initializes the ESP32 DevKit V1 with GPIO manager and configures pins.
 * This function runs once at system startup and performs:
 * 1. GPIO Manager initialization
 * 2. Configuration of required GPIO pins
 * 3. Verification of pin configuration
 */
void setup(void)
{
    // Initialize Serial communication for debugging (optional)
    Serial.begin(115200);
    delay(100);

    // Initialize the GPIO Manager
    // This sets up the internal GPIO management structure and resets all pins to unconfigured state
    if (GPIO_Manager_Init())
    {
        Serial.println("GPIO Manager initialized successfully");
    }
    else
    {
        Serial.println("ERROR: GPIO Manager initialization failed");
    }

    // Example: Configure GPIO pin 2 as OUTPUT with initial state LOW
    // GPIO pin 2 is commonly available on ESP32 DevKit V1
    if (GPIO_Configure_Pin(2, APP_GPIO_MODE_OUTPUT, APP_GPIO_STATE_LOW))
    {
        Serial.println("GPIO pin 2 configured as OUTPUT");
    }
    else
    {
        Serial.println("ERROR: Failed to configure GPIO pin 2");
    }

    // Example: Configure GPIO pin 4 as OUTPUT with initial state LOW
    if (GPIO_Configure_Pin(4, APP_GPIO_MODE_OUTPUT, APP_GPIO_STATE_LOW))
    {
        Serial.println("GPIO pin 4 configured as OUTPUT");
    }
    else
    {
        Serial.println("ERROR: Failed to configure GPIO pin 4");
    }

    // Example: Configure GPIO pin 5 as INPUT with no initial state
    // Input pins don't have initial state but the parameter is required by the function
    if (GPIO_Configure_Pin(5, APP_GPIO_MODE_INPUT, APP_GPIO_STATE_LOW))
    {
        Serial.println("GPIO pin 5 configured as INPUT");
    }
    else
    {
        Serial.println("ERROR: Failed to configure GPIO pin 5");
    }

    // Example: Configure GPIO pin 18 as INPUT with internal PULLUP
    if (GPIO_Configure_Pin(18, APP_GPIO_MODE_INPUT_PULLUP, APP_GPIO_STATE_LOW))
    {
        Serial.println("GPIO pin 18 configured as INPUT_PULLUP");
    }
    else
    {
        Serial.println("ERROR: Failed to configure GPIO pin 18");
    }

    // Display total number of configured pins
    uint8_t configured_count = GPIO_Get_Configured_Count();
    Serial.print("Total configured GPIO pins: ");
    Serial.println(configured_count);

    delay(500);
}

/**
 * loop()
 * Main program loop that runs continuously after setup() completes.
 * This function performs:
 * 1. Runtime state management checks
 * 2. GPIO state monitoring
 * 3. GPIO control operations
 */
void loop(void)
{
    // Perform runtime state management check to validate all configured pins
    // This checks that pin states are consistent between hardware and internal management
    if (GPIO_Runtime_State_Check())
    {
        // All configured pins are in valid state
    }
    else
    {
        // At least one pin state is invalid
        Serial.println("WARNING: GPIO runtime state check detected inconsistency");
    }

    // Example: Read the state of GPIO pin 5 (configured as INPUT)
    GPIOState_t pin5_state = GPIO_Read_State(5);
    Serial.print("GPIO pin 5 state: ");
    Serial.println((pin5_state == APP_GPIO_STATE_HIGH) ? "HIGH" : "LOW");

    // Example: Read the state of GPIO pin 18 (configured as INPUT_PULLUP)
    GPIOState_t pin18_state = GPIO_Read_State(18);
    Serial.print("GPIO pin 18 state: ");
    Serial.println((pin18_state == APP_GPIO_STATE_HIGH) ? "HIGH" : "LOW");

    // Example: Toggle GPIO pin 2 (configured as OUTPUT) every loop iteration
    GPIOState_t pin2_current_state = GPIO_Read_State(2);
    GPIOState_t pin2_new_state = (pin2_current_state == APP_GPIO_STATE_HIGH) ? APP_GPIO_STATE_LOW : APP_GPIO_STATE_HIGH;
    if (GPIO_Set_State(2, pin2_new_state))
    {
        Serial.print("GPIO pin 2 set to: ");
        Serial.println((pin2_new_state == APP_GPIO_STATE_HIGH) ? "HIGH" : "LOW");
    }
    else
    {
        Serial.println("ERROR: Failed to set GPIO pin 2 state");
    }

    // Example: Set GPIO pin 4 to HIGH
    if (GPIO_Set_State(4, APP_GPIO_STATE_HIGH))
    {
        Serial.println("GPIO pin 4 set to HIGH");
    }
    else
    {
        Serial.println("ERROR: Failed to set GPIO pin 4");
    }

    // Example: Verify pin configuration mode for pin 2
    GPIOMode_t pin2_mode = GPIO_Get_Mode(2);
    Serial.print("GPIO pin 2 mode: ");
    switch (pin2_mode)
    {
        case APP_GPIO_MODE_INPUT:
            Serial.println("INPUT");
            break;
        case APP_GPIO_MODE_OUTPUT:
            Serial.println("OUTPUT");
            break;
        case APP_GPIO_MODE_INPUT_PULLUP:
            Serial.println("INPUT_PULLUP");
            break;
        case APP_GPIO_MODE_INPUT_PULLDOWN:
            Serial.println("INPUT_PULLDOWN");
            break;
        default:
            Serial.println("UNKNOWN");
            break;
    }

    // Example: Check if GPIO pin 4 is configured
    if (GPIO_Is_Configured(4))
    {
        Serial.println("GPIO pin 4 is configured");
    }
    else
    {
        Serial.println("GPIO pin 4 is NOT configured");
    }

    // Delay to prevent rapid loop iterations and allow observable changes
    delay(2000);
}

/* END CODE */