[MinnowBoard] [Serial communication Problem]
Mathieu COTEROT
mcoterot at implantrack.com
Wed Nov 9 10:10:05 UTC 2016
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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