UART using ESP32 WROOM 32

[molinajimenez]

Hey guys, new to the forum. I'm kinda new regarding the ESP32 so I'm starting the learning curve.
Right now I'm having issues while trying to get communication wit a Ublox 6M GPS. I've already connected everything, however when I try to get a response via UART I'm not getting anything, right now the code looks like this:

#DATA GPS READER
from machine import UART, Pin
import utime
import os
#pin nummber, baud
#Guessing baud rate between GPS, ESP module

uart = UART(1, baudrate=9600, bits=8, parity=None, stop=1, tx=32, rx=33, rts=-1, cts=-1, txbuf=256, rxbuf=256, timeout=500)

now = utime.ticks_ms()
sentence=uart.readline()
#printing machine name...
idName = os.uname().machine
print(idName)

if uart.any():
print("im getting something...")
b = uart.read()

else:
print("nothing yet...")


I keep getting the "nothing yet..." response, so I don't know what may be happening. Also, I doubled checked everything is connected as it should be. Thanks a lot for your help

[shiftyphil]

It looks like you are calling uart.readline() a few lines before you call uart.any().

This will consume any input data on the serial port, so uart.any() will always return 0.

[gdsports]

I am using UART2 like this. Change the baud rate as needed. Once you see GPS data switch to using readline().

Code: Select all

# ESP32 UART2 dump incoming data in hex

from machine import UART

uart = UART(2, tx=17, rx=16)
uart.init(115200, bits=8, parity=None, stop=1)

while True:
    data = uart.read(1)

    if data is not None:
        # Show the byte as 2 hex digits then in the default way
        print("%02x " % (data[0]), end='')
        print(data)

[molinajimenez]

I'm sorry I took a few days to reply, been offline due to several reasons (ISP). Thanks a lot for your reply, with your help I was able to get the UART working!