Re: PC104 Serial Port Programming

"starman" <sdoan003@xxxxxxx> wrote in message
news:1131557547.944922.296750@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Thanks for asking...
>
> Let me first give you some background information on what I am
> attempting to do. I am using the PC104 board serial ports to... read
> in GPS position coordinates from a GPS on one serial port, read in
> measurements from a temperature sensor on another serial port, take
> these two data strings and combine them, and then via another serial
> send them to an amateur radio modem for transmission. Now as I said
> before I can get COM3 (temp sensor) and COM4 (GPS) to read in correctly
> however when I attempt to use COM1 or COM2 nothing happens. I would
> also like to add that my temp sensor is powered by the serial port and
> when it is connected to COM3 or COM4 the power LED illuminates (thus
> showing that at least something is happening). I have noticed that the
> difference between the serial ports on my PC and on the PC104 is that
> on the PC104 when I connect my temp sensor the led light automatically
> comes on without running my code. However, on my PC, the power light
> is off until my code is executed. When my code finishes the light goes
> back off. This ofcourse is not the case with the PC104 board. The
> power LED is ON constantly when the temp sensor is pluged into COM3 and
> COM4 and always off when I connect it to COM1 and COM2 (thus showing it
> is receiving no power. I have tried to connect COM2 to my PC and
> transmit some characters however this does not work, nor does the
> receive. I am not using interupts, and to be completely honest all I
> know about interupts is the word "interupts" itself. Perhaps this is
> my problem, could you possibly elaborate on this or atleast direct me
> to something that would easily explain this topic. I do not have a
> computer science background, I am just stuborn and like to learn things
> I know nothing about. I hope this helps, just let me know if you have
> any more questions.
>
Is your application reading and writing directly to the UART registers? IIRC,
the built-in UART I/O ports are not at the same addresses as they are in a PC.

--
James T. White


.

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