Souce Block

Hi!

I have many source blocks with different kinds of signal generator and I
want to create a configurable unique block.

Can I make a source block with multiple outputs each one with a
different
rate?

Thank you,

John

On Wed, Aug 25, 2010 at 10:08:22AM -0300, John Li wrote:

Hi!

I have many source blocks with different kinds of signal generator and I
want to create a configurable unique block.

Can I make a source block with multiple outputs each one with a different
rate?

Thank you,
John

Yes you can in 3.3.*

Your block will need to derive from gr_block, and in general_work you
must call produce for each output streams, and general_work must
return WORK_CALLED_PRODUCE as it’s value.

From gr_block.h:

//! Magic return values from general_work
enum {
WORK_CALLED_PRODUCE = -2,
WORK_DONE = -1
};

/*!

  • \brief Tell the scheduler \p how_many_items were produced on output
    stream \p which_output.
  • If the block’s general_work method calls produce, \p general_work
    must return WORK_CALLED_PRODUCE.
    */
    void produce (int which_output, int how_many_items);

Eric

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