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README.md

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+# Zephyr USB Command Handler
+
+This repository contains the implementation of a USB command handler for the Zephyr RTOS. The system allows devices to communicate via USB using custom command messages.
+
+### Components
+
+1. **command_handler.c/h**: Handles incoming commands, processes them, and performs actions based on the command type.
+2. **command_message.c/h**: Manages the creation, validation, and logging of command messages, including CRC calculation.
+3. **usb.c/h**: Manages USB initialization, data reception via UART, and sending responses. Includes a USB thread.
+4. **usb_conf.c/h**: Configures the USB device.
+
+### Command Structure
+
+```c
+struct command_message_t {
+    uint8_t prefix;     // 0x69
+    uint8_t length;
+    uint8_t id;
+    uint8_t command;
+    uint8_t crc;
+    uint8_t data[160];
+} __attribute__((packed));
+```
+
+### CRC Calculation Function
+
+```c
+uint8_t calculate_crc(struct command_message_t *msg) {
+    uint32_t sum = 0;
+    uint8_t crc = 0;
+
+    uint8_t *byte_ptr = (uint8_t *)msg;
+
+    for (int i = 0; i < (sizeof(struct command_message_t) - sizeof(msg->data) + msg->length) - 1; i++) {
+        sum += byte_ptr[i];
+    }
+
+    crc = 0x100 - (sum & 0xff);
+
+    return crc;
+}
+```
+
+### Python test script (AI generated)
+
+**Command Usage:**
+
+```bash
+python3 scripts/led_blink.py
+```
+
+This script sends LED toggle commands to the device connected via USB.