Re: [Gumstix-users] Using the Palo43 Serial Connectors

[Daniel Riegel <riegel@en...>]

Hi Eric,

Yes, we are using the Rx/Tx connectors on the Palo43.  We hooked up both,
not sure which I am currently using, but the other one seemed to interfere
with console output, so we disconnected it.  The one my signals come out
from is /dev/ttyS0.  The voltage levels coming out of the Palo43 are 1.8 V.
We had to make a level shifter circuit to boost the signal to 3.3 V on the
way to our radio, and reduce the signal to 1.8 V on the way to the Palo43.
If you'd like some pointers on how to put together that circuit, I can ask
our electrical engineer.  BTW, since I sent the last message, I discovered
that the -8 flag fixed most of the serial problems I was having, so the new
agetty command is

agetty -8 19200 ttyS0

There are still some odd characters at the beginning of some lines I'd love
to share findings on the serial interfacing front.  Do you understand how to
change a serial output from being a console to being usable for device I/O?

Best,
Dan

Re: [Gumstix-users] Using the Palo43 Serial Connectors

[Daniel Riegel <riegel@en...>]

Hi Eric,

Yes, we are using the Rx/Tx connectors on the Palo43.  We hooked up both,
not sure which I am currently using, but the other one seemed to interfere
with console output, so we disconnected it.  The one my signals come out
from is /dev/ttyS0.  The voltage levels coming out of the Palo43 are 1.8 V.
We had to make a level shifter circuit to boost the signal to 3.3 V on the
way to our radio, and reduce the signal to 1.8 V on the way to the Palo43.
If you'd like some pointers on how to put together that circuit, I can ask
our electrical engineer.  BTW, since I sent the last message, I discovered
that the -8 flag fixed most of the serial problems I was having, so the new
agetty command is

agetty -8 19200 ttyS0

There are still some odd characters at the beginning of some lines I'd love
to share findings on the serial interfacing front.  Do you understand how to
change a serial output from being a console to being usable for device I/O?

Best,
Dan