Hi Risa,
the chances of us getting mad are extremely slim :)
I presume you've already made progress in this; if not: what line exactly does
your debugger say your segmentation fault happens? If you haven't worked with a
debugger before (in your case, probably gdb), it's a skill that pays to learn
within days, if not hours, of coding.
Best regards,
Marcus
On 11 May 2018 01:06:05 GMT+02:00, risa asir via USRP-users
<usrp-users@lists.ettus.com> wrote:
>Hi all,
>I am a newbie in USRP and UHD. Please dont be mad at me if I am wrong.
>I am
>currently trying to implement SRSLTE using multi usrp. However I have
>been
>stuck for days trying to contain real data from the buffer received. If
>I
>try to assign the buffs_ptr with the data_c, it says core Segmentation
>fault (core dumped). I attach my piece of code below. Please help me
>for
>some idea to solve this. I am very grateful for your help.
>
>Thank you.
>
>Regards,
>Risa
>
>
>
>
>int multi_usrp_recv_with_time_multi(void *h,
> void *data[SRSLTE_MAX_PORTS],
> uint32_t nsamples,
> bool blocking,
> time_t *secs,
> double *frac_secs) {
> md = rx_md_first;
> size_t rxd_samples = 0;
> const size_t rx_nof_samples = rx_stream_handle->get_max_num_samps();
> int trials = 0;
> if (blocking) {
> uint32_t n = 0;
> while (n < nsamples && trials < 100) {
> void *buffs_ptr[4];
> for (size_t i=0;i<rx_nof_channel;i++) {
> cf_t *data_c = (cf_t*) data[i];
> buffs_ptr[i] = &data_c[n];
> }
> size_t num_samps_left = nsamples - n;
> size_t num_rx_samples = (num_samps_left > rx_nof_samples)
>? rx_nof_samples : num_samps_left;
> // printf("testing1");
> rxd_samples = 0;
> rxd_samples =
>rx_stream_handle->recv(buffs_ptr,num_rx_samples, md,1.0,false);
> printf("rxd_samples: %lu", rxd_samples);
> if (md.error_code == uhd::rx_metadata_t::ERROR_CODE_TIMEOUT) {
> printf("ERROR_CODE_TIMEOUT");
> };
> if (md.error_code == uhd::rx_metadata_t::ERROR_CODE_LATE_COMMAND){
> printf("ERROR_CODE_LATE_COMMAND");
> };
> if (md.error_code == uhd::rx_metadata_t::ERROR_CODE_BROKEN_CHAIN){
> printf("ERROR_CODE_BROKEN_CHAIN");
> };
> if (md.error_code == uhd::rx_metadata_t::ERROR_CODE_OVERFLOW){
> printf("ERROR_CODE_OVERFLOW");
> };
> if (md.error_code == uhd::rx_metadata_t::ERROR_CODE_ALIGNMENT){
> printf("ERROR_CODE_ALIGNMENT");
> };
> if (md.error_code == uhd::rx_metadata_t::ERROR_CODE_BAD_PACKET){
> printf("ERROR_CODE_BAD_PACKET");
> };
>
> md = rx_md;
> n += rxd_samples;
> trials++;
> }
> } else {
> rxd_samples = rx_stream_handle->recv(data,nsamples, md,0.0,false);
> }
> if (secs && frac_secs) {
> *secs = md.time_spec.get_full_secs();
> *frac_secs = md.time_spec.get_frac_secs();
>
> }
> return nsamples;
> }
--
This was written on my cellular phone. whilst an impressive piece of
engineering, this might not be the perfect device to write emails on - please
excuse my brevity._______________________________________________
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