From a983b7d923bc4448aea625350db3246dcb951c27 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=91=A8=E9=99=88=E5=8D=9A?= <1134950748@qq.com>
Date: Mon, 29 Nov 2021 11:36:08 +0000
Subject: [PATCH] =?UTF-8?q?update=20ports/quectel/core/gnss.py.=20?=
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原因：由于此时串口的GPS模组还没有将数据上报，所以此时调用 read_gnss_data（）会报错，错误信息 self.r1.group(0) group 不存在。

此处增加一个返回返回值，这样线程中调用的时候。使用的时候，可以不断去询问串口是否有数据发送。

例子：
def  GpsQueuePush():
       gnss = GnssGetData(GPS_CONFIG['uartn'],GPS_CONFIG['baudrate'],GPS_CONFIG['databits'],GPS_CONFIG['parity'],GPS_CONFIG['stopbits'],GPS_CONFIG['flowctl'])
       while(1):
             utime.sleep_us(10) # 加个延时避免EC200U/EC600U运行重启
             if gnss.read_gnss_data():
                      location = gnss.getLocation()
                     gps_result.lng = '%.7f' % location[2]
                     gps_result.lat = '%.7f' % location[0]
---
 ports/quectel/core/gnss.py | 28 +++++++++++++++++-----------
 1 file changed, 17 insertions(+), 11 deletions(-)

diff --git a/ports/quectel/core/gnss.py b/ports/quectel/core/gnss.py
index cdc812a..dff9110 100644
--- a/ports/quectel/core/gnss.py
+++ b/ports/quectel/core/gnss.py
@@ -38,17 +38,23 @@ class GnssGetData:
     #读取GNSS数据并加以解析
     def read_gnss_data(self):
         try:
-            buf = self.uart.read(self.uart.any())
-            gps_data = buf.decode().strip("b")
-            self.r = ure.search("GNGGA(.+?)M", gps_data)
-            self.r1 = ure.search("GNRMC(.+?)M", gps_data)
-            self.r2 = ure.search("GPGSV(.+?)M", gps_data)
-            self.r3 = ure.search("GNVTG(.+?)M", gps_data)
-            global fixFlag
-            if self.r1.group(0).split(",")[2] == 'A': #有效定位
-                fixFlag=1
-            else:
-                fixFlag=0
+            msgLen = self.uart.any()
+            if msgLen:
+                buf = self.uart.read(self.uart.any())
+                gps_data = buf.decode().strip("b")
+                self.r = ure.search("GNGGA(.+?)M", gps_data)
+                self.r1 = ure.search("GNRMC(.+?)M", gps_data)
+                self.r2 = ure.search("GPGSV(.+?)M", gps_data)
+                self.r3 = ure.search("GNVTG(.+?)M", gps_data)
+                global fixFlag
+                if self.r1.group(0).split(",")[2] == 'A': #有效定位
+                    fixFlag=1
+                else:
+                    fixFlag=0
+
+                return True
+            else：
+                return False
         except:
             print("Exception:read gnss data error!!!!!!!!")
             raise
-- 
Gitee