[Peeweelinux] 16754 uart

[Troy Engel]

On the 16C554 uarts we use (4port Advantech PCM-3643) there are some dip 
switches that caused problems. One of them was labeled "98/NT Mode" 
which has to be *off*. The other problemo was getting all the dips for 
the IRQ/base address right so as not to interfere with other serial 
devices on the mainboard.

Once I got those nailed, using setserial was my friend and everything 
started to work, e.g.:

/usr/bin/setserial -v /dev/ttyS4 uart 16550A port 0x240 irq 9
/usr/bin/setserial -v /dev/ttyS5 uart 16550A port 0x248 irq 9
...

hth,
-te

Jim Graham wrote:
> Hi
> 
>    I am trying to interface to a quad uart card which uses TI's
> TL16C754B 64 byte fifo uart.  I have verified that the card is set up
> correctly (after the open I manipulate the device registers for now) but
> still not able to communicate.   I created the device file using
> setserial with uart 16750.
> 
>    I can open the device but a write never seems to send data to the
> UART.  I enabled the debugging prints.  When I close the device I get
> transmission of data from the UART but it looks like random data.
> 
> Any suggestions?  Is this a path to an end?
> 
> thanks
> jim

-- 
Troy Engel, Systems Engineer
Not suitable for children.