用python写一段PCBA功能测试脚本，包含CAN总线通讯测试

在Python中编写PCBA（Print Circuit Board Assembly，印刷电路板组件）功能测试脚本，特别是针对CAN（Controller Area Network）总线通信测试，通常需要使用相关的CAN库，如`can`模块（如果是标准库）或第三方库如`pymycan`。以下是一个简单的例子，假设我们已经有了一个基本的CAN设备：

# 导入必要的CAN库
import can

# 初始化CAN接口
if __name__ == "__main__":
    bus = can.interface.Bus(channel='can0', bustype='socketcan')

    # 测试发送和接收数据
    def send_message(id, data):
        message = can.Message(arbitration_id=id, is_extended_id=True, data=data)
        try:
            bus.send(message)
            print(f"Sent CAN message with ID {id}: {data}")
        except can.CanError as e:
            print(f"Error sending message: {e}")

    def receive_message():
        try:
            msg = bus.recv()
            if msg is not None:
                arbitration_id = msg.arbitration_id
                data = msg.data
                print(f"Received CAN message: ID {arbitration_id}, Data {data}")
            else:
                print("No message received")
        except can.CanError as e:
            print(f"Error receiving message: {e}")

    # 功能测试
    send_message(0x123, [0x45, 0x67])
    receive_message()

    # 关闭连接
    bus.shutdown()