Hi there,
I am not being able to get GNSS data. So far, I have configured my raspberry pi with an internet connection using ECM mode, connected the sixfab base HAT with EC25-E module to raspberry pi along with the antenna, and have run the following code for about 10 minutes under good reach to open sky,
from time import sleep
import serial
portwrite = "/dev/ttyUSB2"
port = "/dev/ttyUSB1"
def parseGPS(data):
if data[0:6] == "$GPRMC":
sdata = data.split(",")
if sdata[2] == 'V':
print(sdata)
print("No satellite data available.")
return
# -----Parsing GPRMC----- #
time = sdata[1][0:2] + ":" + sdata[1][2:4] + ":" + sdata[1][4:6]
lat = decode(sdata[3]) #latitude
dirLat = sdata[4] #latitude direction N/S
lon = decode(sdata[5]) #longitute
dirLon = sdata[6] #longitude direction E/W
speed = sdata[7] #Speed in knots
trCourse = sdata[8] #True course
date = sdata[9][0:2] + "/" + sdata[9][2:4] + "/" + sdata[9][4:6] #date
variation = sdata[10] #variation
degreeChecksum = sdata[12]
dc = degreeChecksum.split("*")
degree = dc[0] #degree
checksum = dc[1] #checksum
latitude = lat.split() # parsing latitude
longitute = lon.split() # parsing longitute
print("\nLatitude: " + str(int(latitude[0]) + (float(latitude[2])/60)) + dirLat)
print("Longitute: " + str(int(longitute[0]) + (float(longitute[2])/60)) + dirLon)
#print("time : %s, latitude : %s(%s), longitude : %s(%s), speed : %s,
#True Course : %s, Date : %s, Magnetic Variation : %s(%s),Checksum : %s "%
#(time,lat,dirLat,lon,dirLon,speed,trCourse,date,variation,degree,checksum))
def decode(coord):
#Converts DDDMM.MMMMM -> DD deg MM.MMMMM min
x = coord.split(".")
head = x[0]
tail = x[1]
deg = head[0:-2]
min = head[-2:]
return deg + " deg " + min + "." + tail + " min"
print("Connecting Port..")
try:
serw = serial.Serial(portwrite, baudrate = 115200, timeout = 1,rtscts=True, dsrdtr=True)
serw.write('AT+QGPS=1\r'.encode())
serw.close()
sleep(0.5)
except Exception as e:
print("Serial port connection failed.")
print(e)
print("Receiving GPS data\n")
ser = serial.Serial(port, baudrate = 115200, timeout = 0.5,rtscts=True, dsrdtr=True)
while True:
data = ser.readline().decode('utf-8')
parseGPS(data)
I am only getting the following error.
a. How might be the cause?
b. How do I assign port and portwrite values? Can that be the reason?
c. Can a static charge issue on the Quectel module damage the GPS?
Thanks in advance.
Regards,
Saman