Re: [Discuss-gnuradio] PMT blobs in Python
I can't really test this right now, but you could insert %include into your project's swig file[1]; this should generate a python method cdata(ptr, length) that you can feed your blob_data() to. I'm not quite sure that WILL work as is, maybe you will need a C(++) wrapper that simply returns an array of known type (that is, int* instead of void*) that you can yourself wrap into a SWIG array_class (like in the linked document). Greetings Marcus [1] http://www.swig.org/Doc1.3/Library.html#Library_nn7 On 08/04/2013 04:37 AM, Peter Horvath wrote: Hi, can I convert a blob created by my C++ code (unsigned chars) to a Python list or NumPy array? pmt.blob_data() returns a 'SwigPyObject' with which I can't do anything. Passing it to a NumPy array constructor doesn't seem to do the job. The blobs are in a tuple: pmt::pmt_t b1 = pmt::make_blob(a, a_length); pmt::pmt_t b2 = pmt::make_blob(b, b_length); return pmt::make_tuple(b1, b2); And I try to check the contents of b1 in QA code like this: res = my_test_function() b1 = pmt.blob_data(pmt.tuple_ref(res, 0)) b1_len = pmt.blob_length(pmt.tuple_ref(res, 0)) Thanks, Peter ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] channel estimation
Dear All, I am trying to implement channel estimation in ofdm. I made the attached flow graph and also python file is attached. I used ofdm_mod and demod. blocks, and I edited the "ofdm frame acquistion.cc" to print channel coff. but the displayed taps is incorrect. Regards, Eslam ahmed trial3.grc Description: Binary data trial.py Description: Binary data ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] PMT blobs in Python
On second thought: Does using pmt.make_vector solve your problem? in C++: p = pmt::make_u8vector(length, fill); (do stuff like pmt::u8vector_set(p, index, value), or even unsigned char* p_vec = pmt::u8vector_writable_elements(p,length). The later can summon hell if you use the same PMT object in multiple places.) in python: myvec= pmt.u8vector_elements(p) Note, however, that this will inherently copy each individual uchar to a python (long) int. If you really want the raw bytes, you can always get really dependent on PMT structure (which is basically fine, as long as you know that PMT won't change during the lifetime of your application), and use pmt.serialize_str(p) in python, as this will give you a string. Thinking about that, there is yet another option, that suddendly blob's into mind. in C++ , generate a std::string, and assign your char data to it: std::string looks_like_it_s_text_but_is_data s(); s.assign(reinterpret_cast(mydata), length); pmt::pmt_t p = pmt::intern(s); In python, you can use pmt.to_string(p) to get back the string, in case you want to use it for a buffer. PLEASE, be aware that this is NOT a good idea for high data volume or high throughput; string_to_symbol hashes the string, and saves the hash as well as the pmt_t in a table. On 08/04/2013 12:08 PM, Marcus Müller wrote: I can't really test this right now, but you could insert %include into your project's swig file[1]; this should generate a python method cdata(ptr, length) that you can feed your blob_data() to. I'm not quite sure that WILL work as is, maybe you will need a C(++) wrapper that simply returns an array of known type (that is, int* instead of void*) that you can yourself wrap into a SWIG array_class (like in the linked document). Greetings Marcus [1] http://www.swig.org/Doc1.3/Library.html#Library_nn7 On 08/04/2013 04:37 AM, Peter Horvath wrote: Hi, can I convert a blob created by my C++ code (unsigned chars) to a Python list or NumPy array? pmt.blob_data() returns a 'SwigPyObject' with which I can't do anything. Passing it to a NumPy array constructor doesn't seem to do the job. The blobs are in a tuple: pmt::pmt_t b1 = pmt::make_blob(a, a_length); pmt::pmt_t b2 = pmt::make_blob(b, b_length); return pmt::make_tuple(b1, b2); And I try to check the contents of b1 in QA code like this: res = my_test_function() b1 = pmt.blob_data(pmt.tuple_ref(res, 0)) b1_len = pmt.blob_length(pmt.tuple_ref(res, 0)) Thanks, Peter ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] PMT blobs in Python
Hi Marcus, pmt.u8vector_elements() did the trick. The result being a long array is not a problem, I could compare its elements with a list using assertSequenceEqual(). Thank you, Peter ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Students coming to GRCon!
Students! If you are coming or interested in coming to GRCon this year, Ettus Research is once again offering to cover the cost of the conference registration (a $250 offer). We have set up a webpage to apply for this offer. Just fill out the form and provide some proof of enrollment at a college or university for fall of 2013. http://www.trondeau.com/grcon2013-student-registration/ This is not a US-only offer. All students are eligible! And please remember to thank Matt and Ettus Research for their dedication and support of students working in software radio. -- Tom Visit us at GRCon13 Oct. 1 - 4 http://www.trondeau.com/grcon13 ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Low cost SDR compatible with openbts and gnuradio
Hi list, I want to introduce an sdr which compatible with openbts and gnuradio. the sdr have one tx and one rx in a sigle board. Use usb to connect to computer. the price is 450$ per unit. Regards ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
