Hi Marcus,
Thank you very much for your previous reply.
Yeah i have progressed very far from my previous question. However, i still
have a problem when i try to run the application using 2 USRP, I saw only 1
light indicator in TX/RX is ON which i believe only one USRP is sending the
data (On RX side both indicator is ON). And suddenly the application freeze
after that. When i try to re-run the application, i got a following error
saying "what(): RuntimeError: BIST failed! (code: 1)"
To fix the BIST failed, i have to power cycle both USRP, but it doesnt
solve the "only one USRP is sending" problem, and the problem keep coming
back.
I then try to do the benchmark_rate test to make sure the problem comes
from the application not from the usrp, by using the following :
./benchmark_rate --tx_rate "1e6" --args
"addr0=192.168.40.2,addr1=192.168.140.2" --channels "0,2" --ref "external"
--pps "external".
However, I still got the same problem: Only 1 out of 2 channel is sending
the data and the benchmark_test freezes. After that i have to power cycle
both USRP to make it work again.
The weird thing is If i try benchmark_rate using rx_rate all the RX
channels light is On and benchmark test success with 0 error.
At this point i am concluding something wrong with the tx front end.
Could you give me an insight what might happen and how to fix the problem?
It is my pleasure to get answer from you
Thank you very much,
Regards,
Risa.
2018-05-19 19:17 GMT+10:00 Marcus Müller <marcus.muel...@ettus.com>:
> 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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