HI everybody, I am new at mailing list. These days I am writing an emulator for emulating tx/rx streams based on uhd 3.15LTS I am using device usrp2 device from uhd/lib. As I saw in examples (rx_samples_to_file), I am creating a mock streamer ( taken from uhd tests ). and now i want to push samples inside the buffer. I see that i can define type of samples, if am using 'short' type of samples, I am creating uint32_t variable, 16 MSB i put real part of sample, and 16 LSB i put imaginary part of sample (i am using little endian) After that i am calling usrp->recv() and i get samples as i defined ( spp is 2000) (0,0) (2,2) .... (1999,1999) as expected, according to data I push to the mock buffer.
now while i want to use type 'float' i am using for example float real = 1.5 float imag = 2.5 and trying to push sample to the mock buffer, i am doing: buffer[0] = (uint32_t)real; buffer[1] = (uint32_t)imag; and expecting to get after calling usrp->recv() (1.5, 2.5) but i get incorrect result (convertor settings: cpu_format "fc32", otw_format "sf16" ) i am printing real and imag parameters as bitset<32> and see in real part, in 16 LSB part of result, my 16 MSB bits from sample value 1.5, and in imagine part zeros, in next sample i see in 16 LSB part of result, 16 MSB bits of sample value 2.5. I mean one sample i push to buffer uses whole sample after calling recv() P.S i set scale factor to 1.0 What am I doing wrong to use the type 'float' and 'double' for mock samples? I am new at usrp so I don't understand what samples I should use, will be glad to get references. Thanks
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