问题描述
我遵循了 adafruit 教程,并尝试运行以下 python 脚本来获取 gps 信号:
# SPDX-FilecopyrightText: 2021 ladyada for Adafruit Industries
# SPDX-License-Identifier: MIT
# Simple GPS module demonstration.
# Will wait for a fix and print a message every second with the current location
# and other details.
import time
import busio
#had to make a new module "adafruit_gps1" because of typo in original
import adafruit_gps1
# Create a serial connection for the GPS connection using default speed and
# a slightly higher timeout (GPS modules typically update once a second).
# These are the defaults you should use for the GPS FeatherWing.
# For other boards set RX = GPS module TX,and TX = GPS module RX pins.
#uart = busio.UART(TX,RX,baudrate=9600,timeout=10)
# for a computer,use the pyserial library for uart access
import serial
uart = serial.Serial("/dev/ttyS0",timeout=10)
# If using I2C,we'll create an I2C interface to talk to using default pins
# i2c = board.I2C()
# Create a GPS module instance.
gps = adafruit_gps1.GPS(uart,debug=False) # Use UART/pyserial
# gps = adafruit_gps.GPS_GtopI2C(i2c,debug=False) # Use I2C interface
# Initialize the GPS module by changing what data it sends and at what rate.
# These are NMEA extensions for PMTK_314_SET_NMEA_OUTPUT and
# PMTK_220_SET_NMEA_UPDAteraTE but you can send anything from here to adjust
# the GPS module behavior:
# https://cdn-shop.adafruit.com/datasheets/PMTK_A11.pdf
# Turn on the basic GGA and RMC info (what you typically want)
gps.send_command(b"PMTK314,1,0")
# Turn on just minimum info (RMC only,location):
# gps.send_command(b'PMTK314,0')
# Turn off everything:
# gps.send_command(b'PMTK314,0')
# Turn on everything (not all of it is parsed!)
# gps.send_command(b'PMTK314,0')
# Set update rate to once a second (1hz) which is what you typically want.
gps.send_command(b"PMTK220,1000")
# Or decrease to once every two seconds by doubling the millisecond value.
# Be sure to also increase your UART timeout above!
# gps.send_command(b'PMTK220,2000')
# You can also speed up the rate,but don't go too fast or else you can lose
# data during parsing. This would be twice a second (2hz,500ms delay):
# gps.send_command(b'PMTK220,500')
# Main loop runs forever printing the location,etc. every second.
last_print = time.monotonic()
while True:
# Make sure to call gps.update() every loop iteration and at least twice
# as fast as data comes from the GPS unit (usually every second).
# This returns a bool that's true if it parsed new data (you can ignore it
# though if you don't care and instead look at the has_fix property).
gps.update()
# Every second print out current location details if there's a fix.
current = time.monotonic()
if current - last_print >= 1.0:
last_print = current
if not gps.has_fix:
# Try again if we don't have a fix yet.
print("Waiting for fix...")
continue
# We have a fix! (gps.has_fix is true)
# Print out details about the fix like location,date,etc.
print("=" * 40) # Print a separator line.
print(
"Fix timestamp: {}/{}/{} {:02}:{:02}:{:02}".format(
gps.timestamp_utc.tm_mon,# Grab parts of the time from the
gps.timestamp_utc.tm_mday,# struct_time object that holds
gps.timestamp_utc.tm_year,# the fix time. Note you might
gps.timestamp_utc.tm_hour,# not get all data like year,day,gps.timestamp_utc.tm_min,# month!
gps.timestamp_utc.tm_sec,)
)
print("Latitude: {0:.6f} degrees".format(gps.latitude))
print("Longitude: {0:.6f} degrees".format(gps.longitude))
print("Fix quality: {}".format(gps.fix_quality))
# Some attributes beyond latitude,longitude and timestamp are optional
# and might not be present. Check if they're None before trying to use!
if gps.satellites is not None:
print("# satellites: {}".format(gps.satellites))
if gps.altitude_m is not None:
print("Altitude: {} meters".format(gps.altitude_m))
if gps.speed_knots is not None:
print("Speed: {} knots".format(gps.speed_knots))
if gps.track_angle_deg is not None:
print("Track angle: {} degrees".format(gps.track_angle_deg))
if gps.horizontal_dilution is not None:
print("Horizontal dilution: {}".format(gps.horizontal_dilution))
if gps.height_geoid is not None:
print("Height geo ID: {} meters".format(gps.height_geoid))
代码运行时没有错误,但它只会生成“等待修复...”,并且从未找到修复。即使未连接 GPS,该代码也会运行。所以我只是想知道我可以改变什么才能获得实际的 gps 输出?
解决方法
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