Howdy Bianca,

1)††††† Is your pin muxing set up properly?

2)††††† Are you using an appropriate level shifter for your pins?

You can enable the right muxing properly very simply by using devmem2 Ė I canít think of the addresses to set up off hand, but the TRM is invaluable in this regard.†

Re level shifter: if youíre just playing around, sparkfun make one that will give you TTL levels for relatively cheap.†



From: Bianca Prince []
Sent: Wednesday, 31 August 2011 1:52 AM
Subject: [Gumstix-users] Using Additional Serial Ports - i.e. ttyS0 or ttyS1

I'm attempting to communicate with a piece of hardware via the ttyS0 serial port - using the Tobi Board 9/10 pins.† I'm attempting to interface with the hardware as a simple serial port connection.† So far I've had no luck being able read across this connection.†

Right now I'm keeping the software portion very simple just to see if I can get something working it's simply using the termios api to open the connection set the attributes and attempting to read from it.

Are there additional things that need to be done to enable this port?† Am I missing something in the hardware portion that's required for this to function properly.† Driver?†

Any information is appreciated?