为什么使用spidev发送的消息在从ADC接收位时发生变化？

Question

我正在使用SpiDev模块（https://github.com/doceme/py-spidev）控制Raspberry Pi上的Texas Instruments ADS1261EVM（并使用Python编程）

当我发送存储为变量的消息时，xfer2函数似乎会改变发送的消息变量

import spidev
spi = spidev.SpiDev()
spi.open(0,0)
send = [0x20,0x0,0x0]
print (send) # to verify that the message is [0x20,0x0,0x0]
received = spi.xfer2(send)
print(send, received) # prints [received] [received]

为什么变量send在收到时会被覆盖

Answer 1

有一个bug报告：https://github.com/doceme/py-spidev/issues/61