From 8c0b6823fd8743cb829973811bed5f96226bb53d Mon Sep 17 00:00:00 2001
From: Mitchell M <mitchoah@gmail.com>
Date: Mon, 30 Mar 2026 20:57:29 -0500
Subject: [PATCH] expander work

---
 CMakeLists.txt                       |   5 +-
 blk_box.cpp                          |   8 +-
 drivers/CMakeLists.txt               |   1 +
 drivers/expander.cpp                 | 246 +++++++++++++++++++++++++++
 drivers/i2c.cpp                      |  24 ++-
 include/blk_box.h                    |   5 +
 include/blk_box_drivers/expander.hpp | 221 ++++++++++++++++++++++++
 include/blk_box_drivers/i2c.h        |  13 +-
 include/pins.h                       |   7 +-
 9 files changed, 522 insertions(+), 8 deletions(-)
 create mode 100644 drivers/expander.cpp
 create mode 100644 include/blk_box_drivers/expander.hpp

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 399b669..10a9b50 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,9 @@
 idf_component_register(
     SRCS "blk_box.cpp"
-    INCLUDE_DIRS "include"
+    INCLUDE_DIRS "include" "."
+    PRIV_REQUIRES 
+        esp_driver_gpio
+        esp_driver_i2c
 )
 
 add_subdirectory(drivers)
diff --git a/blk_box.cpp b/blk_box.cpp
index 5cad864..bc7de64 100644
--- a/blk_box.cpp
+++ b/blk_box.cpp
@@ -1,5 +1,9 @@
 #include "blk_box.h"
 
+#include "blk_box_drivers/i2c.h"
+#include "blk_box_drivers/expander.hpp"
+
 void init_blk_box(BlkBoxInitConfig cfg) {
-    
-}
\ No newline at end of file
+    init_main_i2c();
+    init_expander();
+}
diff --git a/drivers/CMakeLists.txt b/drivers/CMakeLists.txt
index 1fc3e65..0fca01c 100644
--- a/drivers/CMakeLists.txt
+++ b/drivers/CMakeLists.txt
@@ -1,4 +1,5 @@
 set(SOURCES 
+    "expander.cpp"
     "i2c.cpp"
 )
 
diff --git a/drivers/expander.cpp b/drivers/expander.cpp
new file mode 100644
index 0000000..2b22a0c
--- /dev/null
+++ b/drivers/expander.cpp
@@ -0,0 +1,246 @@
+#include "blk_box_drivers/expander.hpp"
+
+#include "pins.h"
+#include "blk_box_drivers/i2c.h"
+#include "driver/i2c_master.h"
+#include "driver/gpio.h"
+#include "esp_log.h"
+#include "esp_err.h"
+
+static const char *TAG = "EXPANDER";
+
+i2c_master_dev_handle_t expander_i2c_dev_handle;
+
+const static uint8_t REG_WHOAMI = 0x01;
+const static uint8_t REG_SW_VERSION = 0x02;
+const static uint8_t REG_EVENT_QUEUE_POP = 0x10;
+const static uint8_t REG_EVENT_QUEUE_LEN = 0x11;
+const static uint8_t REG_STATE_BUTTONS = 0x20;
+const static uint8_t REG_STATE_SWITCHES = 0x21;
+const static uint8_t REG_STATE_KEYPAD = 0x22;
+const static uint8_t REG_STATE_TOUCH = 0x23;
+const static uint8_t REG_STATE_RFID = 0x24;
+const static uint8_t REG_STATE_HALL = 0x25;
+const static uint8_t REG_STATE_CLOSE = 0x26;
+const static uint8_t REG_RESET = 0x30;
+const static uint8_t REG_HALL_SENSITIVITY = 0x31;
+const static uint8_t REG_CLOSE_SENSITIVITY = 0x32;
+const static uint8_t REG_SWITCH_TOUCH_EVENT = 0x33;
+
+ExpanderPeripheral expander_peripheral;
+
+// forward declarations
+static void handle_event(uint8_t event);
+static void handle_button_switch_event(uint8_t event);
+static void handle_keypad_event(uint8_t event);
+static void handle_touch_event(uint8_t event);
+static void handle_rfid_event(uint8_t event);
+static void handle_close_hal_event(uint8_t event);
+
+void init_expander() {
+    ESP_LOGI(TAG, "Initializing expander...");
+
+    i2c_device_config_t dev_config = {
+        .dev_addr_length = I2C_ADDR_BIT_LEN_7,
+        .device_address = EXPANDER_I2C_ADDR,
+        .scl_speed_hz = EXPANDER_I2C_SPEED,
+        .scl_wait_us = 0, // default
+        .flags = {
+            .disable_ack_check = 0,
+        }
+    };
+
+    ESP_ERROR_CHECK(i2c_master_bus_add_device(i2c_main_bus_handle, &dev_config, &expander_i2c_dev_handle));
+    ESP_LOGD(TAG, "Expander I2C device added to bus");
+
+    // TODO: setup interrupt on PIN_EXPANDER_INT
+
+    uint8_t read_buf[2] = {0};
+
+    ESP_ERROR_CHECK(i2c_master_transmit_receive(expander_i2c_dev_handle, &REG_WHOAMI, 1, read_buf, 1, EXPANDER_TIMEOUT_MS));
+
+    if (read_buf[0] != EXPANDER_WHOAMI_VALUE) {
+        ESP_LOGE(TAG, "WHOAMI mismatch, expected 0x%02X, got 0x%02X", EXPANDER_WHOAMI_VALUE, read_buf[0]);
+        return;
+    }
+
+    ESP_LOGD(TAG, "Expander WHOAMI check passed");
+
+    ESP_ERROR_CHECK(i2c_master_transmit_receive(expander_i2c_dev_handle, &REG_SW_VERSION, 1, read_buf, 2, EXPANDER_TIMEOUT_MS));
+
+    // init the peripheral struct
+    expander_peripheral.state_mutex = xSemaphoreCreateMutex();
+    expander_peripheral.button_press_events= xQueueCreate(EXPANDER_EVENT_QUEUE_SIZE, sizeof(Button));
+    expander_peripheral.button_release_events= xQueueCreate(EXPANDER_EVENT_QUEUE_SIZE, sizeof(Button));
+    expander_peripheral.switch_flip_events= xQueueCreate(EXPANDER_EVENT_QUEUE_SIZE, sizeof(SwitchFlip));
+    expander_peripheral.switch_touch_events= xQueueCreate(EXPANDER_EVENT_QUEUE_SIZE, sizeof(SwitchTouch));
+    expander_peripheral.touch_events= xQueueCreate(EXPANDER_EVENT_QUEUE_SIZE, sizeof(TouchedReleased));
+    expander_peripheral.keypad_press_events= xQueueCreate(EXPANDER_KEYPAD_QUEUE_SIZE, sizeof(KeypadKey));
+    expander_peripheral.keypad_release_events= xQueueCreate(EXPANDER_KEYPAD_QUEUE_SIZE, sizeof(KeypadKey));
+
+    ESP_LOGI(TAG, "Expander initialized! SW version: v%d.%d", read_buf[0], read_buf[1]);
+}
+
+void get_events() {
+    uint8_t recv;
+    do {
+        ESP_ERROR_CHECK(i2c_master_transmit_receive(expander_i2c_dev_handle, &REG_EVENT_QUEUE_POP, 1, &recv, 1, EXPANDER_TIMEOUT_MS));
+        handle_event(recv);
+    } while (gpio_get_level(PIN_EXPANDER_INT) == 0);
+}
+
+static void handle_event(uint8_t event) {
+    const uint8_t BUTTON_SWITCH = 0b000;
+    const uint8_t KEYPAD = 0b001;
+    const uint8_t TOUCH = 0b010;
+    const uint8_t RFID = 0b011;
+
+    ESP_LOGI(TAG, "Expander event: 0b%08b (0x%02X)", event, event);
+
+    if (event == 0) {
+        ESP_LOGE(TAG, "We read from event queue while it was empty!");
+        return;
+    }
+
+    uint8_t type_bits = event >> 5;
+
+    switch (type_bits) {
+        case BUTTON_SWITCH:
+            handle_button_switch_event(event);
+            break;
+        case KEYPAD:
+            handle_keypad_event(event);
+            break;
+        case TOUCH:
+            handle_touch_event(event);
+            break;
+        case RFID:
+            handle_rfid_event(event);
+            break;
+        default:
+            handle_close_hal_event(event);
+            break;
+    }
+}
+
+static void handle_button_switch_event(uint8_t event) {
+    const uint8_t PRESSED_NOT_RELEASED_BIT = 0b10000;
+    const uint8_t SWITCH_NOT_BUTTON_BIT = 0b01000;
+    const uint8_t SWITCH_UP_NOT_DOWN_BIT = 0b00100;
+    const uint8_t NUMBER_MASK = 0b00011;
+
+    bool pressed = (event & PRESSED_NOT_RELEASED_BIT) != 0;
+    uint8_t number = event & NUMBER_MASK;
+
+    if ((event & SWITCH_NOT_BUTTON_BIT) != 0) {
+        // For now, we support two position switches by only looking at the switch up events
+        bool switch_up = (event & SWITCH_UP_NOT_DOWN_BIT) != 0;
+        if (!switch_up) {
+            return;
+        }
+
+        Switch sw = static_cast<Switch>(number);
+        SwitchFlip sw_flip = SwitchFlip(sw, pressed);
+        if (xQueueSendToBack(expander_peripheral.switch_flip_events, &sw_flip, 0) != pdTRUE) {
+            ESP_LOGE(TAG, "Failed to send switch flip event!");
+        }
+        xSemaphoreTake(expander_peripheral.state_mutex, portMAX_DELAY);
+        if (pressed) {
+            // set
+            expander_peripheral.state.switch_state |= 1 << number;
+        } else {
+            // clear
+            expander_peripheral.state.switch_state &= ~(1 << number);
+        }
+        xSemaphoreGive(expander_peripheral.state_mutex);
+    } else {
+        // button
+        Button button = static_cast<Button>(number);
+        if (pressed) {
+            if (xQueueSendToBack(expander_peripheral.button_press_events, &button, 0) != pdTRUE) {
+                ESP_LOGE(TAG, "Failed to send button press event!");
+            }
+            xSemaphoreTake(expander_peripheral.state_mutex, portMAX_DELAY);
+            expander_peripheral.state.button_state |= 1 << number;
+            xSemaphoreGive(expander_peripheral.state_mutex);
+        } else {
+            if (xQueueSendToBack(expander_peripheral.button_release_events, &button, 0) != pdTRUE) {
+                ESP_LOGE(TAG, "Failed to send button release event!");
+            }
+            xSemaphoreTake(expander_peripheral.state_mutex, portMAX_DELAY);
+            expander_peripheral.state.button_state &= ~(1 << number);
+            xSemaphoreGive(expander_peripheral.state_mutex);
+        }
+    }
+}
+
+static void handle_keypad_event(uint8_t event) {
+    const uint8_t PRESSED_NOT_RELEASED_BIT = 0b10000;
+    const uint8_t KEY_MASK = 0b1111;
+
+    bool pressed = (event & PRESSED_NOT_RELEASED_BIT) != 0;
+    uint8_t number = event & KEY_MASK;
+    KeypadKey key = static_cast<KeypadKey>(number);
+
+    // starcode system gets first dibs
+    // TODO: do starcode inbetweener
+    // if starcode_handle_keypad(key, pressed).await {
+    //     return;
+    // }
+
+    if (pressed) {
+        if (xQueueSendToBack(expander_peripheral.keypad_press_events, &key, 0) != pdTRUE) {
+            ESP_LOGE(TAG, "Failed to send keypad press event!");
+        }
+        xSemaphoreTake(expander_peripheral.state_mutex, portMAX_DELAY);
+        expander_peripheral.state.keypad_state |= 1 << number;
+        xSemaphoreGive(expander_peripheral.state_mutex);
+    } else {
+        if (xQueueSendToBack(expander_peripheral.keypad_release_events, &key, 0) != pdTRUE) {
+            ESP_LOGE(TAG, "Failed to send keypad release event!");
+        }
+        xSemaphoreTake(expander_peripheral.state_mutex, portMAX_DELAY);
+        expander_peripheral.state.keypad_state &= ~(1 << number);
+        xSemaphoreGive(expander_peripheral.state_mutex);
+    }
+}
+
+static void handle_touch_event(uint8_t event) {
+    const uint8_t TOUCHED_NOT_UNTOUCHED_BIT = 0b10000;
+    const uint8_t SENSOR_MASK = 0b0111;
+    const uint8_t FINGERPRINT_BIT = 0b0100;
+
+    bool touched = (event & TOUCHED_NOT_UNTOUCHED_BIT) != 0;
+    uint8_t sensor = event & SENSOR_MASK;
+
+    if ((sensor & FINGERPRINT_BIT) != 0) {
+        TouchedReleased touch_state = static_cast<TouchedReleased>(touched);
+        if (xQueueSendToBack(expander_peripheral.touch_events, &touch_state, 0) != pdTRUE) {
+            ESP_LOGE(TAG, "Failed to send touch event!");
+        }
+    } else {
+        Switch sw = static_cast<Switch>(sensor);
+        SwitchTouch sw_touch = SwitchTouch(sw, touched);
+        if (xQueueSendToBack(expander_peripheral.switch_touch_events, &sw_touch, 0) != pdTRUE) {
+            ESP_LOGE(TAG, "Failed to send switch touch event!");
+        }
+    }
+
+    xSemaphoreTake(expander_peripheral.state_mutex, portMAX_DELAY);
+    if (touched) {
+        expander_peripheral.state.touch_state |= 1 << sensor;
+    } else {
+        expander_peripheral.state.touch_state &= ~(1 << sensor);
+    }
+    xSemaphoreGive(expander_peripheral.state_mutex);
+}
+
+static void handle_rfid_event(uint8_t event) {
+    // TODO: impl
+    (void)event;
+}
+
+static void handle_close_hal_event(uint8_t event) {
+    // TODO: impl
+    (void)event;
+}
diff --git a/drivers/i2c.cpp b/drivers/i2c.cpp
index 0223f27..4886bd9 100644
--- a/drivers/i2c.cpp
+++ b/drivers/i2c.cpp
@@ -1,5 +1,23 @@
-#include "stdio.h"
+#include "blk_box_drivers/i2c.h"
 
-void i2c_test() {
-    printf("initializing i2c or something\n");
+#include "pins.h"
+
+i2c_master_bus_handle_t i2c_main_bus_handle;
+
+void init_main_i2c() {
+    i2c_master_bus_config_t bus_config = {
+        .i2c_port = MAIN_I2C_NUM,
+        .sda_io_num = PIN_SDA,
+        .scl_io_num = PIN_SCL,
+        .clk_source = I2C_CLK_SRC_DEFAULT,
+        .glitch_ignore_cnt = 7,
+        .intr_priority = 0,
+        .trans_queue_depth = 0,
+        .flags = {
+            .enable_internal_pullup = false,
+            .allow_pd = false,
+        }
+    };
+
+    ESP_ERROR_CHECK(i2c_new_master_bus(&bus_config, &i2c_main_bus_handle));
 }
\ No newline at end of file
diff --git a/include/blk_box.h b/include/blk_box.h
index 7be879f..9fa7ce7 100644
--- a/include/blk_box.h
+++ b/include/blk_box.h
@@ -1,3 +1,6 @@
+#ifndef BLK_BOX_H
+#define BLK_BOX_H
+
 struct BlkBoxInitConfig {
     // nothing for now...
 };
@@ -5,3 +8,5 @@ struct BlkBoxInitConfig {
 
 
 void init_blk_box(BlkBoxInitConfig cfg);
+
+#endif // BLK_BOX_H
diff --git a/include/blk_box_drivers/expander.hpp b/include/blk_box_drivers/expander.hpp
new file mode 100644
index 0000000..1e22218
--- /dev/null
+++ b/include/blk_box_drivers/expander.hpp
@@ -0,0 +1,221 @@
+#ifndef EXPANDER_H
+#define EXPANDER_H
+
+#include "blk_box_drivers/i2c.h"
+#include <freertos/FreeRTOS.h>
+#include <freertos/semphr.h>
+
+#define EXPANDER_I2C_ADDR (0x7E)
+#define EXPANDER_I2C_SPEED (400000)
+#define EXPANDER_TIMEOUT_MS (10)
+
+#define EXPANDER_WHOAMI_VALUE (0x85)
+
+// queue sizes
+#define EXPANDER_EVENT_QUEUE_SIZE 4
+#define EXPANDER_KEYPAD_QUEUE_SIZE 16
+
+void init_expander();
+
+/// The four buttons on the bottom half.
+enum class Button: uint8_t {
+    B1 = 0,
+    B2 = 1,
+    B3 = 2,
+    B4 = 3,
+    GREEN = 0,
+    YELLOW = 1,
+    RED = 2,
+    BLUE = 3,
+};
+
+/// The four switches on the bottom half.
+enum class Switch: uint8_t {
+    S1 = 0,
+    S2 = 1,
+    S3 = 2,
+    S4 = 3,
+};
+
+enum class TouchedReleased: uint8_t {
+    Released = 0,
+    Touched = 1,
+};
+
+/// One of the keys on the keypad.
+enum class KeypadKey: uint8_t {
+    K0 = 0,
+    K1 = 1,
+    K2 = 2,
+    K3 = 3,
+    K4 = 4,
+    K5 = 5,
+    K6 = 6,
+    K7 = 7,
+    K8 = 8,
+    K9 = 9,
+    A = 10,
+    B = 11,
+    C = 12,
+    D = 13,
+    STAR = 14,
+    POUND = 15,
+};
+
+struct SwitchFlip {
+private:
+    // [bit2: pressed] [bit1-0: switch] 
+    uint8_t data;
+
+public:
+    // Constructor
+    SwitchFlip(Switch sw, bool pressed)
+        : data((static_cast<uint8_t>(sw) & 0b11) |
+               ((pressed ? 1 : 0) << 2)) {}
+
+    // Default constructor
+    SwitchFlip() : data(0) {}
+
+    // Getters
+    Switch get_switch() const {
+        return static_cast<Switch>(data & 0b11);
+    }
+
+    bool is_pressed() const {
+        return (data >> 2) & 1;
+    }
+
+    // Setters
+    void set_switch(Switch sw) {
+        data = (data & ~0b11) | (static_cast<uint8_t>(sw) & 0b11);
+    }
+
+    void set_pressed(bool pressed) {
+        data = (data & ~(1 << 2)) | ((pressed ? 1 : 0) << 2);
+    }
+};
+static_assert(sizeof(SwitchFlip) == 1);
+
+struct SwitchTouch {
+private:
+    // [bit2: touched] [bit1-0: switch] 
+    uint8_t data;
+
+public:
+    // Constructor
+    SwitchTouch(Switch sw, bool touched)
+        : data((static_cast<uint8_t>(sw) & 0b11) |
+               ((touched ? 1 : 0) << 2)) {}
+
+    // Default constructor
+    SwitchTouch() : data(0) {}
+
+    // Getters
+    Switch get_switch() const {
+        return static_cast<Switch>(data & 0b11);
+    }
+
+    bool is_touched() const {
+        return (data >> 2) & 1;
+    }
+
+    // Setters
+    void set_switch(Switch sw) {
+        data = (data & ~0b11) | (static_cast<uint8_t>(sw) & 0b11);
+    }
+
+    void set_touched(bool touched) {
+        data = (data & ~(1 << 2)) | ((touched ? 1 : 0) << 2);
+    }
+};
+static_assert(sizeof(SwitchTouch) == 1);
+
+struct ButtonOrSwitch {
+private:
+    // [bit2: is_switch] [bit1-0: number]
+    uint8_t data;
+
+public:
+    // Constructor
+    ButtonOrSwitch(uint8_t number, bool is_switch)
+        : data((number & 0b11) |
+               ((is_switch ? 1 : 0) << 2)) {}
+
+    ButtonOrSwitch() : data(0) {}
+
+    // Getters
+    uint8_t number() const {
+        return data & 0b11;
+    }
+
+    bool is_switch() const {
+        return (data >> 2) & 1;
+    }
+
+    // Setters
+    void set_number(uint8_t number) {
+        data = (data & ~0b11) | (number & 0b11);
+    }
+
+    void set_is_switch(bool is_switch) {
+        data = (data & ~(1 << 2)) | ((is_switch ? 1 : 0) << 2);
+    }
+};
+static_assert(sizeof(ButtonOrSwitch) == 1);
+
+
+/// @brief The state of the bottom half of the box.
+struct ExpanderState {
+    /// The touch state of the switches in the lower 4 bits.
+    /// The touch pad state in bit 4.
+    uint8_t touch_state;
+    /// The current state of the buttons in the lower 4 bits.
+    uint8_t button_state;
+    /// The current state of the switches. Up switches are stored
+    /// in the lower 4 bits, switches that are down are stored in
+    /// the upper 4 bits. If switches are in the middle, the
+    /// corresponding bit will be `0` in the upper and lower 4.
+    uint8_t switch_state;
+    /// The state of the keypad.
+    uint16_t keypad_state;
+    /// The sensitivity of the `hal` value to auto update.
+    uint16_t hal_sense;
+    /// The sensitivity of the `close_hal` value to auto update.
+    uint16_t close_hal_sense;
+    /// A non-exact hal value reading.
+    /// This only gets updated when it changes by `hal_sense`
+    uint16_t hal;
+    /// A non-exact hal value reading.
+    /// This only gets updated when it changes by `close_hal_sense`
+    uint16_t close_hal;
+    /// The RFID card that was presented last.
+    uint32_t rfid_state;
+
+    ExpanderState() : touch_state(0), button_state(0), switch_state(0), keypad_state(0), hal_sense(0), close_hal_sense(0), hal(0), close_hal(0), rfid_state(0) {}
+};
+
+/// The global data for the expander peripheral.
+class ExpanderPeripheral {
+    // TODO: change these to private
+    public: 
+    SemaphoreHandle_t state_mutex;
+    ExpanderState state;
+
+    // channels
+    QueueHandle_t button_press_events;
+    QueueHandle_t button_release_events;
+    QueueHandle_t switch_flip_events;
+    QueueHandle_t switch_touch_events;
+    QueueHandle_t touch_events;
+    QueueHandle_t keypad_press_events;
+    QueueHandle_t keypad_release_events;
+    // button_press_events: Channel<CriticalSectionRawMutex, Button, EXPANDER_EVENT_QUEUE_SIZE>,
+    // button_release_events: Channel<CriticalSectionRawMutex, Button, EXPANDER_EVENT_QUEUE_SIZE>,
+    // switch_flip_events: Channel<CriticalSectionRawMutex, SwitchFlip, EXPANDER_EVENT_QUEUE_SIZE>,
+    // switch_touch_events: Channel<CriticalSectionRawMutex, SwitchTouch, EXPANDER_EVENT_QUEUE_SIZE>,
+    // touch_events: Channel<CriticalSectionRawMutex, TouchRelease, EXPANDER_EVENT_QUEUE_SIZE>,
+    // keypad_press_events: Channel<CriticalSectionRawMutex, KeypadKey, EXPANDER_KEYPAD_QUEUE_SIZE>,
+    // keypad_release_events: Channel<CriticalSectionRawMutex, KeypadKey, EXPANDER_KEYPAD_QUEUE_SIZE>,
+};
+
+#endif // EXPANDER_H
\ No newline at end of file
diff --git a/include/blk_box_drivers/i2c.h b/include/blk_box_drivers/i2c.h
index dbccfe1..78912b2 100644
--- a/include/blk_box_drivers/i2c.h
+++ b/include/blk_box_drivers/i2c.h
@@ -1 +1,12 @@
-void i2c_test();
\ No newline at end of file
+#ifndef I2C_H
+#define I2C_H
+
+#include "driver/i2c_master.h"
+
+#define MAIN_I2C_NUM I2C_NUM_0
+
+extern i2c_master_bus_handle_t i2c_main_bus_handle;
+
+void init_main_i2c();
+
+#endif // I2C_H
diff --git a/include/pins.h b/include/pins.h
index ba1f765..876204b 100644
--- a/include/pins.h
+++ b/include/pins.h
@@ -1,7 +1,10 @@
+#ifndef PINS_H
+#define PINS_H
+
 #include "driver/gpio.h"
 
 #define PIN_SDA          (GPIO_NUM_7)
-#define PIN_SDA          (GPIO_NUM_15)
+#define PIN_SCL          (GPIO_NUM_15)
 
 #define PIN_LCD_MISO     (GPIO_NUM_16)
 #define PIN_LCD_MOSI     (GPIO_NUM_17)
@@ -38,3 +41,5 @@
 #define PIN_PERH2        (GPIO_NUM_4)
 #define PIN_PERH3        (GPIO_NUM_2)
 #define PIN_PERH4        (GPIO_NUM_1)
+
+#endif // PINS_H