Print Page - trivial problem with the serial port

Title: trivial problem with the serial port
Post by: AndreaB on September 09, 2013, 03:53:10 PM

Hi,
I recently bought a 4GB card with A20.
I tried to connect with UART0 to see if it works correctly and instead I came across atrivial problem, but I can not solve:
using putty, from the console I can't see properly the boot sequence, but a sequence of random characters. I tried several combinations of speed, parity stop bit, etc. .. with no result :( . Can anyone help me to figure out if the card is gone or to solve the problem?

Regards

Andrea

Title: Re: trivial problem with the serial port
Post by: pinnchus on September 10, 2013, 02:08:55 AM

usually a speed compatibility problem or an error in the RX TX connection. make sure you are at 115200 bps and tx from conveter is connected to rx in the board and vice versa for rx from converter.
Regards,
Pinnchus

Title: Re: trivial problem with the serial port
Post by: rzr on January 05, 2014, 02:32:53 AM

this worked from me from RPI's UART to OLinuXino UART (3wires)

screen /dev/ttyAMA0 115200

U-Boot 2011.09-rc1-00000-geceb6aa-dirty (Sep 17 2013 - 14:53:57) Allwinner Technology

Olimex Support Forum

OLinuXino Android / Linux boards and System On Modules => A20 => Topic started by: AndreaB on September 09, 2013, 03:53:10 PM