OSError: [Errno 5] Raspberry PI GPS屏蔽Python的输入/输出错误

Question

我有一个Raspberry PI 3和一个GSM/GPRS/GNSS HAT。

我想用Python从设备读取GPS数据。我使用了文档中的示例代码，并稍微重写了一下。它完美地工作了几个小时，但是有一次当我重新启动Raspberry时(我以前重新启动过，它工作得很好)，它在几次成功读取后开始抛出这个:

Traceback (most recent call last):
File "/home/ubuntu/gps.py", line 90, in listenForGpsInfo
while ser.inWaiting() > 0:
File "/usr/lib/python3/dist-packages/serial/serialutil.py", line 594, in inWaiting
return self.in_waiting
File "/usr/lib/python3/dist-packages/serial/serialposix.py", line 531, in in_waiting
s = fcntl.ioctl(self.fd, TIOCINQ, TIOCM_zero_str)
OSError: [Errno 5] Input/output error

下面是我的代码:

def listenForGpsInfo(callback):
ser = serial.Serial("/dev/ttyS0",baudrate=115200)
W_buff = [b"AT+CGNSPWR=1rn", b"AT+CGNSSEQ="RMC"rn", b"AT+CGNSINFrn", b"AT+CGNSURC=2rn", b"AT+CGNSTST=1rn"]
ser.write(W_buff[0])
ser.flushInput()
data = ""
num = 0
while True:
time.sleep(utils.GPS_INTERVAL_IN_SECONDS)
try:
while ser.inWaiting() > 0:
data += ser.read(ser.inWaiting()).decode()
print(data)
if data != "":
if  num < len(W_buff)-1:
print(num)
ser.write(W_buff[num+1])
num =num +1
else:
ser.write(W_buff[2])
if "+CGNSINF" in data:
data = str(data)
gpsInfo = parseGpsData(findInfoLine(data))
if(gpsInfo is not None):
callback(gpsInfo)

data = ""
except Exception as e:
if ser != None:
ser.close()
traceback.print_exc()
listenForGpsInfo(callback)
return

以下是串行命令的文档:https://www.waveshare.com/w/upload/3/3d/SIM868_GNSS_Application_Note_V1.00.pdf

我试了很多方法，但我不能解决它。我试过的几件事:

• 重启设备
• 卸载和附加屏蔽
• 只发送AT+CGNSPWR=1rn和AT+CGNSINFrn命令
• chmod 666 /dev/ttyS0

Answer 1

我在树莓上安装了ubuntu，当我安装树莓os时，错误消失了。