Compiling Error

[jsa91]

This happens while running "make".

pi@raspberrypi:~/rtl_map/build $ cmake ../ -- Checking FFTW3... -- FFTW3 found! -- Checking RTL_SDR... -- RTL_SDR found! -- Configuring done -- Generating done -- Build files have been written to: /home/pi/rtl_map/build

pi@raspberrypi:~/rtl_map/build $ make [ 50%] Building C object CMakeFiles/rtl_map.dir/rtl_map.c.o /home/pi/rtl_map/rtl_map.c:53:15: error: initializer element is not constant _samp_rate = n_read * 4000, /*!< [ARG] Sample rate (optional) */ ^~~~~~ CMakeFiles/rtl_map.dir/build.make:62: recipe for target 'CMakeFiles/rtl_map.dir/rtl_map.c.o' failed make[2]: *** [CMakeFiles/rtl_map.dir/rtl_map.c.o] Error 1 CMakeFiles/Makefile2:72: recipe for target 'CMakeFiles/rtl_map.dir/all' failed make[1]: *** [CMakeFiles/rtl_map.dir/all] Error 2 Makefile:129: recipe for target 'all' failed make: *** [all] Error 2

Linux raspberrypi 4.14.90-v7+ #1183

[orhun]

Thanks for the submission.
Tried to fix at 7fd5aa4
Can you try to build it again?

[jsa91]

Yep, that solved it.

Next issue though:

pi@raspberrypi:~ $ rtl_map -f 88000000 -g 30
[23:27:41] INFO Starting rtl_map ~
[23:27:41] INFO Found 1 device(s):
[23:27:41] INFO #0: Generic RTL2832U OEM
Found Rafael Micro R820T tuner
[23:27:42] INFO Using device: #0
[23:27:42] INFO Supported gain values (29): 0.0 0.9 1.4 2.7 3.7 7.7 8.7 12.5 14.4 15.7 16.6 19.7 20.7 22.9 25.4 28.0 29.7 32.8 33.8 36.4 37.2 38.6 40.2 42.1 43.4 43.9 44.5 48.0 49.6 
[23:27:42] INFO Gain set to 2.7
[23:27:42] INFO Center frequency set to 88000000 Hz.
[23:27:42] INFO Sampling at 2048000 S/s
[23:27:42] INFO Creating FFT graph from samples using gnuplot...
[23:27:42] INFO Done, exiting...
Warning: empty x range [-1.04858e+06:-1.04858e+06], adjusting to [-1.05906e+06:-1.03809e+06]

gnuplot> plot '-' smooth frequency with linespoints lt -1 notitle
                                                                 ^
         line 513: all points y value undefined!

What I'm I doing wrong ?

[orhun]

@jsa91
I'm still trying to solve this bug. According to my research, rtl_map works fine when I plug the rtlsdr in to USB 3.0. Can you try it?
Setting output to '-' might help.
Another temporary solution is executing the rtl_test command before the rtl_map.

Still trying to figure out why this happens...
If you find anything useful about this issue, please post.

[orhun]

While I was searching this issue, I realized that it might be about libusb or pipe-libusb sync. I got the same error and I ran the same command one more time. Here's the output:

[04:31:24] INFO Gain set to 1.4
rtlsdr_demod_write_reg failed with -4
rtlsdr_demod_read_reg failed with -4
rtlsdr_demod_write_reg failed with -4
rtlsdr_demod_read_reg failed with -4
rtlsdr_demod_write_reg failed with -4
rtlsdr_demod_read_reg failed with -4
rtlsdr_demod_write_reg failed with -4
rtlsdr_demod_read_reg failed with -4
rtlsdr_demod_write_reg failed with -4
rtlsdr_demod_read_reg failed with -4
rtlsdr_demod_write_reg failed with -4
rtlsdr_demod_read_reg failed with -4
rtlsdr_demod_write_reg failed with -4
rtlsdr_demod_read_reg failed with -4
rtlsdr_demod_write_reg failed with -4
rtlsdr_demod_read_reg failed with -4
rtlsdr_demod_write_reg failed with -4
rtlsdr_demod_read_reg failed with -4
[04:31:24] INFO Center frequency set to 90000000 Hz.
[04:31:24] INFO Sampling at 2048000 S/s
rtlsdr_write_reg failed with -4
rtlsdr_write_reg failed with -4
Allocating 15 zero-copy buffers
Failed to submit transfer 0
Please increase your allowed usbfs buffer size with the following command:
echo 0 > /sys/module/usbcore/parameters/usbfs_memory_mb

After this, it worked fine.
So still researching if the hardware or the software causes this.

[orhun]

a7764da might solve the issue.
Can you try it and post results?