feat: 添加CDC协议通信模块支持

- 集成nanopb库用于protobuf序列化
- 创建cdc_wrapper_module.c实现帧解析功能
- 实现protocol_module.c处理协议编解码
- 定义device_comm.proto通信协议
- 修改CMakeLists.txt添加protobuf源文件
- 更新配置启用NANOPB支持
- 移除usb_cdc_module中基于行的处理逻辑

src/usb_cdc_module.c

@@ -28,7 +28,6 @@ LOG_MODULE_REGISTER(MODULE, LOG_LEVEL_INF);
 #define USB_CDC_RX_RING_BUF_SIZE 256
 #define USB_CDC_TX_RING_BUF_SIZE 256
 #define USB_CDC_RX_CHUNK_SIZE 32
-#define USB_CDC_MAX_LINE_SIZE 96
 #define USB_CDC_CONTROL_POLL_INTERVAL K_MSEC(100)
 #define USB_CDC_EXPECTED_BAUDRATE 115200U
 
@@ -46,9 +45,6 @@ static bool usb_active;
 static bool usb_function_prepared;
 static bool dtr_ready;
 static bool rx_enabled;
-static bool rx_line_overflow;
-static uint8_t rx_line_buf[USB_CDC_MAX_LINE_SIZE];
-static size_t rx_line_len;
 
 static void submit_usb_cdc_rx_event(const uint8_t *data, size_t len)
 {
@@ -72,8 +68,6 @@ static void reset_ring_buffers(void)
 
 	ring_buf_init(&rx_ringbuf, sizeof(rx_ring_buffer), rx_ring_buffer);
 	ring_buf_init(&tx_ringbuf, sizeof(tx_ring_buffer), tx_ring_buffer);
-	rx_line_len = 0U;
-	rx_line_overflow = false;
 
 	irq_unlock(key);
 }
@@ -134,36 +128,6 @@ static void validate_line_coding(void)
 #endif
 }
 
-static void process_rx_byte(uint8_t byte)
-{
-	if ((byte == '\r') || (byte == '\n')) {
-		if (rx_line_overflow) {
-			LOG_WRN("Drop oversized CDC line");
-			rx_line_overflow = false;
-			rx_line_len = 0U;
-			return;
-		}
-
-		if (rx_line_len > 0U) {
-			submit_usb_cdc_rx_event(rx_line_buf, rx_line_len);
-			rx_line_len = 0U;
-		}
-
-		return;
-	}
-
-	if (rx_line_overflow) {
-		return;
-	}
-
-	if (rx_line_len >= sizeof(rx_line_buf)) {
-		rx_line_overflow = true;
-		return;
-	}
-
-	rx_line_buf[rx_line_len++] = byte;
-}
-
 static void rx_work_handler(struct k_work *work)
 {
 	uint8_t buffer[USB_CDC_RX_CHUNK_SIZE];
@@ -181,9 +145,7 @@ static void rx_work_handler(struct k_work *work)
 			return;
 		}
 
-		for (uint32_t i = 0; i < len; i++) {
-			process_rx_byte(buffer[i]);
-		}
+		submit_usb_cdc_rx_event(buffer, len);
 	}
 }