Hello, We are using the FADS board and MPC860T CPU, with ELDK 2.0.2 (kernel 06-10-2002).
We have a device that communicates over RS232 at 9600 bps. This device has a 4 mSec timeout, i.e we have to reply in less then 4mSec. The packets are usually small (4-6 Bytes). We communicate successfully with the device, but only if we change the timeout to above 10mSec. It seems that it takes 5-8 mSec for us to reply. This is the same if we use SMC or SCC. We tried to play with the MAX_IDL and the Tx/Rx buffer sized, but with no success. Has anyone an idea on how to minimize the uart latency? If we use the same code on a PC (i386) we reply in 300 microSec. Thank you, and a happy New Year Eli Brin ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
