UART: I cannot get any reading from GPS

[andrejpekarcik]

Hi,
I connected GPS module to GPy and tried to read some data from it using UART. No success despite many attempts. Reading is always None. GPS module works perfectly as I have connected it to my computer and sends data.

from machine import UART

uart = UART(1, 9600)
uart.init(9600, bits=8, parity=None, stop=1, pins=('P3','P4'))

print (uart.readline())

while True:
    if (uart.any()>0):
            print ('Yra')

Any help appreciated!

Used items:
Exp. board 3.0
(sysname='GPy', nodename='GPy', release='1.18.0.r1', version='v1.8.6-849-9569a73 on 2018-07-20', machine='GPy with ESP32', pybytes='0.9.0')
GPS: GP-20U7

[andrejpekarcik]

@robert-hh

Hooray! I've got it!
Signal wire was broken between pin and GPS. Thanks.

[andrejpekarcik]

Hi,

I tried your code, same result.

How can I test somehow if UART on GPy is working?

[robert-hh]

@andrejpekarcik how about swapping P3 and P4, either the wires or the arguments?

from machine import UART

uart = UART(1, 9600)
uart.init(9600, bits=8, parity=None, stop=1, pins=('P3','P4'))

while True:
    if (uart.any()>0):
            print (uart.readline())

or better:

from machine import UART
import sys

uart = UART(1, 9600)
uart.init(9600, bits=8, parity=None, stop=1, pins=('P3','P4'), timeout_chars = 10)

while True:
    if (uart.any()>0):
        sys.stdout.write(uart.read().decode())