A little background would probably help here. The hardware I am using is my
hardware, I designed it from start to finish, so I'm pretty sure it supports
what I'm doing. Basically its like you said I just stored the float
variable at the address of the UART register, and yes when its gets read its
treated as a float, I looked at the disassemble list and no the software
does not try to convert the value in any way, because it was declared as a
float so it assumes float. And no there isn't any need to wait after a
read, the check I do before I read the UART checks to see if the total
number of bytes I am looking for is actually in the UART, so if it returns
positive, I know that the exact number of words/bytes (however I configure
the hardware) is waiting in the buffer.
On Tue, Aug 16, 2011 at 3:27 PM, Anders Gidenstam
<anders-...@gidenstam.org>wrote:
> On Tue, 16 Aug 2011, Derrick Washington wrote:
>
> > Anders
> >
> > I have included the following line in my generic xml file
> >
> > <output>
> > <binary_mode>true</binary_mode>
> > <byte_order>network</byte_order>
> >
> > My C++ code looks like this now.
> >
> > float gps_vdummy, gps_xdummy, gps_ydummy, gps_zdummy;
> >
> > if ( (quik_silva_status_reg & 0x00001000) != 0 ) { //CHECK TO SEE IF
> > SIMULATOR DATA IS AVAIABLE
> >
> > gps_vdummy = rs232_uart1_fp;
> > gps_zdummy = rs232_uart1_fp;
> > gps_xdummy = rs232_uart1_fp;
> > gps_ydummy = rs232_uart1_fp;
> > etc ...
> >
> > My hardware is returning a 32bit floating point word, in hardware what
> is
> > happening is my UART is taking in the bytes one at a time of course and
> > shifting the into a 32bit register a byte at a time, and returning that
> > 32bit value. Soooo if FG is sending the data MSB(most significant byte
> > first), then I should be getting the correct value, right?
>
> So rs232_uart1_fp is a floating point variable located at the
> address of the UART output register/port or something similar?
> Are you sure it supports that (i.e. reading it as a float)? If not could
> you try reading the 32bit value into an int variable and reinterpret it
> as a float with something like
>
> unsigned int foo = rs232_uart1_u32;
> float bar = *(float *)&foo;
>
> Also, there is no need to wait before reading the next word from the UART?
>
>
> Cheers,
>
> Anders - who hasn't programmed an UART since the 68hc11 and late Amiga
> days.
> --
> ---------------------------------------------------------------------------
> Anders Gidenstam
> WWW: http://www.gidenstam.org/FlightGear/
>
>
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