帮我写一个检测串口丢包率的函数

在Python中，你可以使用`pyserial`库来检测串口通信的丢包情况。这里有一个简单的函数示例，它会计算一段时间内的字节数并估算丢包率。假设我们已经初始化了一个串口实例`ser`：

import serial
import time

def detect_packet_loss(ser, timeout=0.5, sample_time=5): # timeout设定超时时间，sample_time为采样间隔
    bytes_received = 0
    total_bytes_sent = 0
    start_time = time.time()

    while True:
        try:
            data = ser.read(size=1) # 每次读取一个字节
            if data:
                bytes_received += 1
                total_bytes_sent += 1
            elapsed_time = time.time() - start_time
            if elapsed_time >= sample_time:
                break
        except serial.SerialTimeoutException:
            pass

    lost_packets = total_bytes_sent - bytes_received
    packet_loss_rate = (lost_packets / total_bytes_sent) * 100 if total_bytes_sent > 0 else 0

    return packet_loss_rate, lost_packets

# 使用函数，将返回值存储在一个变量里
packet_loss_rate, lost_packets = detect_packet_loss(your_serial_instance)

print(f"Estimated packet loss rate: {packet_loss_rate}% with {lost_packets} lost packets.")