Power & Source of Big Ideas

UART not working, signal very dirty

Moderators: chensy, FATechsupport

I couldn't get the UART to work, but I have a cp210x dongle which works with arduino very well. I connected TX to RX and RX to TX and GND.

I connected oscilloscope and saw the signal is very messy and going up to 6.2V what is going on?

https://1drv.ms/i/s!AmDLImexgdZ6oAQv0d-BkhHxODiu
https://1drv.ms/i/s!AmDLImexgdZ6oAWVGsKNyQgMXctt
The diagram in this image is wrong, ground is the furthest form the board edge Please correct!!!!

http://wiki.friendlyarm.com/wiki/index. ... out-02.jpg
larroy wrote:
The diagram in this image is wrong, ground is the furthest form the board edge Please correct!!!!

http://wiki.friendlyarm.com/wiki/index. ... out-02.jpg


The picture is correct,maybe you are using the V1.1 or V1.2 not V1.31
larroy wrote:
I couldn't get the UART to work, but I have a cp210x dongle which works with arduino very well. I connected TX to RX and RX to TX and GND.

I connected oscilloscope and saw the signal is very messy and going up to 6.2V what is going on?

https://1drv.ms/i/s!AmDLImexgdZ6oAQv0d-BkhHxODiu
https://1drv.ms/i/s!AmDLImexgdZ6oAWVGsKNyQgMXctt

1.The reason for cp210x not working properly is the serial port is connected wrongly.
2.You had wired up wrong the GND
Image
Image

Who is online

In total there are 2 users online :: 1 registered, 0 hidden and 1 guest (based on users active over the past 5 minutes)
Most users ever online was 42 on 15 Jul 2016, 01:04

Users browsing this forum: thomaspfeiffer and 1 guest