Threading&SpiDev IOError[Errno 9]：文件描述错误

Question

我已经为线程创建了一个函数，它连续检查芯片寄存器中是否有中断，如果发生这种中断，它将从芯片中获取值，进行一些计算，并将计算值放入一个队列中，该队列与用tkinter创建的GUI相连接。在

def workerThread1(self):
    ##registers##
    AWATTHR = 0x01
    [...]

    ##variables##
    cAWATTHR = 2.365579 * 10 ** (-5)
    [...]

    ##register values##
    b1MMODE = 0xFC
    [...]

    ##set up SPI##
    spi = spidev.SpiDev()
    spi.open(0, 0)
    spi.mode=0b01

    ##write register values##
    spi.xfer2([WRITE|MMODE, b1MMODE], SPISPD, SPIDLY, SPILNG)
    [...]

    ##loop##
    spi.xfer2([WRITE|LINECYC, b1LINECYC, b2LINECYC], SPISPD, SPIDLY, SPILNG)
    spi.xfer2([RSTATUS], SPISPD, SPIDLY, SPILNG)
    while self.running == 1:
        n = n + 1
        rFREQ = spi.xfer2([FREQ, DBYTE, DBYTE], SPISPD, SPIDLY, SPILNG)
        vFREQ = Bits(uint = rFREQ[1]*VMSB16BIT + rFREQ[2], length = 16)
        sFREQ = sFREQ + vFREQ.uint
        LENERGY = [...]
        if LENERGY == '1':
            rvFREQ = (1 / ((sFREQ / n) * 9.6 * 10 ** (-6)))
            [...]
            transfer = [rvFREQ, [...]]
            self.queue.put(transfer)                
            n = 0
            sFREQ = 0
    spi.close()

不幸的是，我总是通过以下回溯得到“IOError:（Errno 9）Bad file descriptor”（文件描述符错误）：

^{pr2}$

我期待着任何关于我做错了什么的暗示。在