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 \ $(_COMMONOAKROOT)\lib\$(_CPUINDPATH)\serpddcm.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?
3 wire Xscale UART
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3 wire Xscale UART
by skindiver » Sat, 22 Oct 2005 21:08:05 GMT
Re: 3 wire Xscale UART
by mobilevil » Sun, 23 Oct 2005 09:34:12 GMT
try to turn off hardware flow control on both side's software -- ----------------------------------------------------------- kachun
Re: 3 wire Xscale UART
by 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. ...clint...
Re: 3 wire Xscale UART
by 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 EmbeddedFusion www.EmbeddedFusion.com smaillet at EmbeddedFusion dot com
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