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