On Thu, Apr 23, 2015 at 3:09 PM, Yile Ku <[email protected]> wrote:
> I am writing a source module/block and I generate 16 bit signed I and Q
> values. There is first a 16 bit I value then a 16 bit Q value repeated
> 1024 times.
>
> In my source module I have:
>
> usbradio_impl::usbradio_impl()
> : gr::sync_block("usbradio",
> gr::io_signature::make(1, 1, sizeof(short)),
> gr::io_signature::make(1, 1, sizeof(short)))
> {
> state = 0;
> cnt = 0;
> set_max_noutput_items(1);
> set_max_output_buffer(2);
> }
>
Why are you using set_max_noutput_items and set_max_output_buffer like
this? Those numbers don't make any sense. These are fairly advanced
features that you should only use if you know /exactly/ what you are doing
with them. These lines will make assumptions about the flow of data that
will likely hurt how you process things in the work function.
Tom
> /*
> * Our virtual destructor.
> */
> usbradio_impl::~usbradio_impl()
> {
> }
>
> int
> usbradio_impl::work(int noutput_items,
> gr_vector_const_void_star &input_items,
> gr_vector_void_star &output_items)
> {
> short *out = (short *) output_items[0];
>
> // Do <+signal processing+>
> stuff_output(out);
>
> // Tell runtime system how many output items we produced.
> return 1024;
> }
>
> The stuff_output(out) function will stuff an I value then a Q value 512
> times.
>
> Is that the correct way to present I & Q values?
>
> Thx,
> Y-
>
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>
>
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