I am trying to add a command port to the OFDM Allocator block in GNURadio. The goal is for this command port to take a message every 1 ms to change the amplitude of the complex pilot symbols. However, I can not see the port appearing in GRC.
I just wrote some test code to see if the port is appearing. The changes I made are given below:
1) I added this line here:
ofdm_carrier_allocator_cvc_impl::ofdm_carrier_allocator_cvc_impl
{int fft_len,
const std::vector<std::vector<int> > &occupied_carriers,
const std::vector<std::vector<int> > &pilot_carriers,
const std::vector<std::vector<gr_complex> > &pilot_symbols,
const std::vector<std::vector<gr_complex> > &sync_words,
const std::string &len_tag_key,
const bool output_is_shifted
) : tagged_stream_block("ofdm_carrier_allocator_cvc",
io_signature::make(1, 1, sizeof (gr_complex)),
io_signature::make(1, 1, sizeof (gr_complex) * fft_len), len_tag_key),
d_fft_len(fft_len),
d_occupied_carriers(occupied_carriers),
d_pilot_carriers(pilot_carriers),
d_pilot_symbols(pilot_symbols),
d_sync_words(sync_words),
d_symbols_per_set(0),
d_output_is_shifted(output_is_shifted)
{
//MY_CHANGES
message_port_register_in(pmt::mp("test"));
set_msg_handler(pmt::mp("test"), boost::bind(&mac_impl::test_in, this, _1));
2) And then the function test_in is just a function printing out the message "TESTER"
//MY_CHANGES
void test_in (pmt::pmt_t msg) {
// this must be a pair
int count = 0;
if (!pmt::is_blob(pmt::cdr(msg))) {
throw std::runtime_error("PMT must be blob");
}
if(pmt::is_symbol(msg)) {
throw std::runtime_error("#############TESTER#########");
}
}
3) I uninstalled everything and built again. But I cant see anything in the block. I don't see this port at the input of the block.
Can anyone please tell me what am I doing wrong ?