3 wire Xscale UART

windows ce


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3 wire Xscale UART

Postby skindiver » Sat, 22 Oct 2005 21:08:05 GMT

I have a PXA255 serial port (STUART) that only supports RX and TX (3wire).
The driver is patterned after the Mainstone

$(_COMMONOAKROOT)\lib\$(_CPUINDPATH)\com_mdd2.lib \

$(_COMMONOAKROOT)\lib\$(_CPUINDPATH)\oo16550.lib \


Plus some specific 255 .cpp files.

I am having problem in that it does not see rx inputs. The tx seems to be 
working but slowly and intermittently.

Question: Is there anything that needs to be modified at the driver level 
(other then the pin setup)  to support a 3-wire interface as opposed to the 
full modem signal interface?

Re: 3 wire Xscale UART

Postby mobilevil » Sun, 23 Oct 2005 09:34:12 GMT

try to turn off hardware flow control on both side's software


Re: 3 wire Xscale UART

Postby Clinton D. Britt » Mon, 24 Oct 2005 11:44:19 GMT

Is your serial driver implemented with an ISR handler? If not, you you will 
have trouble doing any kind of speed.


Re: 3 wire Xscale UART

Postby Steve Maillet (eMVP) » Mon, 24 Oct 2005 12:09:07 GMT

What, Clint is referring to is the ISR Software FIFO. It's an Installable 
ISR that sucks data out of the hardware FIFO and stores it in an internal 
FIFO, this effectively extends the hardware FIFO by a significant factor, 
allowing the serial driver IST time to quickly extract all of the FIFO data 
in one shot instead of being inundated with lots of interrupts for small 
amounts of data.

Another option is to completely re-write the MS provided drivers to use DMA 
to achieve the highest rates possible.

Steve Maillet
smaillet at EmbeddedFusion dot com

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