> On Mon, Feb 01, 2010 at 05:57:04PM +0100, Christoph Thein wrote: > > Hi, > > > > I am trying to figure out how it is possible to get more than the "U" > > message from the USRP2 to the host via the UART port but I am stucked at > > some point. When I try to transmit other characters than "U" I am > > receiving something completely unpredictable (at least it looks like that > > to me at the moment). I am using the putchar-function in the txrx.c file > > in the firmware/apps directory with the gnuradio version > > 3.3git-601-g18578e23 . > > > > I dug deeper into the code and tried the hal_uart_putc function also but > > with no results. > > > > Does anyone have an idea how to achieve a working signaling throught the > > UART port? > > > > Thanks a lot, > > Cheers, > > Christoph > > Christoph, > > It's just about impossible to get anything more than a few characters > out in the hard real-time part of the code (pretty much everything > after start-up), without causing a problem. This is because we don't > have "infinite buffering", and eventually the code calling the uart > output primitive blocks, causing all kinds of bad things to happen. > You could make the uart output code interrupt driven, but in general, > that will only buy you another 128 bytes or so (whatever memory you're > willing to dedicate to the buffer) before the problem occurs. > > If you've got a logic analyzer to grab the data, and the ISE tools, > it's not too hard to add an additional "setting register" that when > written to, will end up on the mictor debug connector on the > motherboard, or on the GPIO pins of a Tx or Rx Basic/LF daughterboard. > (In lib/memory_map.h add an entry to output_regs_t, and add the > setting register itself in fpga/top/u2_core/u2_core.v). > > Eric >
Hi Eric, thanks! I just want to get a 16 bit value to the host, so basically only a few characters. BR Christoph _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
