我已经创建了一个用于线程的函数,它不断地检查芯片寄存器中断,如果发生这个中断,它将从芯片中获取值,进行一些计算并将计算出的值放入一个链接到a的队列中使用tkinter创建的GUI。
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()
不幸的是我总是得到“IOError:(Errno 9)错误的文件描述符”,带有以下回溯:
Exception in thread Thread-1:
Traceback (most recent call last):
File "/usr/lib/python2.7/threading.py", line 552, in __bootstrap_inner
self.run()
File "/usr/lib/python2.7/threading.py", line 505, in run
self.__target(*self.__args, **self.__kwargs)
File "/home/pi/GUI-LOG/GUI1.py", line 277, in workerThread1
rFREQ = spi.xfer2([FREQ, DBYTE, DBYTE], SPISPD, SPIDLY, SPILNG)
IOError: [Errno 9] Bad file descriptor
我期待着有关我在这里做错的任何提示。