我是python编码的新手,我使用Raspberry Pi作为学习方法。我试着不断地轮询我的板上的输入并将它们打印到屏幕上,但是代码只打印了一次输入状态,似乎在等待什么,而我似乎无法理解。。。任何帮助都将不胜感激。在
# piFace_Control.py
import piface.pfio as pfio
import serial
import time
import struct
def h(val):
return struct.pack('!H', val)
def i(val):
return struct.pack('I', val)
serialA = serial.Serial("/dev/ttyUSB0",9600)
serialA.open()
serialA.flush()
pfio.init()
time.sleep(1)
val2 = 1
run = 1
while (run):
try:
val = serialA.readline()
print(val)
serialA.write(h(0xFE))
serialA.write(' Got it!')
if val2 == 0:
val2 = 1
else:
val2 = 0
print(i(val2))
serialA.write(i(val2))
pfio.digital_write(0,val2)
print "D0: "+str(pfio.digital_read(0))
print "D1: "+str(pfio.digital_read(1))
print "D2: "+str(pfio.digital_read(2))
print "D3: "+str(pfio.digital_read(3))
print "D4: "+str(pfio.digital_read(4))
print "D5: "+str(pfio.digital_read(5))
print "D6: "+str(pfio.digital_read(6))
print "D7: "+str(pfio.digital_read(7))
except (keyboardInterrupt, SystemExit):
print '\nKeyboard Interrupt Caught...'
run = 0
pass
serialA.close()
当你击中:
在第二个循环中,它从不从串行接收完整的行,直到它收到为止。在
在串行连接另一端的任何东西都只发送一条线。在
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