[MinnowBoard] [Serial communication Problem]

[Hofemeier, Ulf]

Hi Mathieu,

To get serial output from the MinnowBoard MAX UART on a Windows host, I would use the following cable.
 
https://www.amazon.com/FTDI-TTL-232R-3V3-SERIAL-CONVERTER-CABLE/dp/B00DDF8TV6/ref=sr_1_10?ie=UTF8&qid=1478709033&sr=8-10&keywords=ftdi+usb+to+ttl

FTDI drivers for Windows are available here: http://www.ftdichip.com/Drivers/VCP.htm 

The terminal settings you have configured in Putty look correct. 

Thanks,
Ulf

-----Original Message-----
From: elinux-MinnowBoard [mailto:elinux-minnowboard-bounces at lists.elinux.org] On Behalf Of Mat0382
Sent: Wednesday, November 09, 2016 2:39 AM
To: elinux-minnowboard at lists.elinux.org
Subject: [MinnowBoard] [Serial communication Problem]

Hi everybody,


I'm looking for a tutorial which describe how to implement a serial communication between the Minnowboard and a PC (OS is Linux Mint on both).
I'm beginner in serial documentation so I tried to follow any documentation I found on the minnowboard wiki and internet but I'm facing a problem that I'm not able solve still now.

I currently have already wired the UART0 (GN, RxD, TxD) on the minnowboard to a RS232/USB converter (this one is plugged to a PC.)

By this way, I'm using the port /dev/ttyS0 (I also tried on /dev/ttyS4 and
ttyS5 by changing the connection but result is the same) on the minnowboard and the port /dev/ttyUSB0 on the PC.
I open putty on each side (PC/minnowboard), with the following configuration
:

    Baud rate: 115200
    Hardware Flow Control: No
    Bits: 8
    Stop: 1


But the behaviour of the communication is weird. I can send data through the
/dev/ttyS0 port on the minnowboard (I electrically check with a voltmeter) but port /dev/ttyUSB0 display nothing on putty.
AND, I can send data by /dev/ttyUSB0 port. These data are received on the
/dev/ttyS0 port (elctrical check with a Voltmeter), and putty display data, but not the good one.
For exemple :
    'a' become '0'
    'z' become '!'
    'e' become 'M'
    'r' become '#'
    't' become ''
    'y' become 'C'

Problem is the same on Linux terminal if I used echo and cat command.


I made several check of the port configuration and wired connection but everything seems to be ok.
I think, I miss something but currently I'm not able to see what.

Does anybody can help me on this point ?

Thanks by advance

Mathieu



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