Re: Sending a signal to a USRP N200

[isaac mario tupac davila]

Hi Marcus

Thanks for the response!!. How do I know which version of the FPGA I should use in the USRP to have no problem with the pins?

I know the USRP is programmed with the FPGA image and its firmware. What is the difference between them? How do I know which version of firmware is adequate for a specific FPPA image?

Regards

Isaac T.

El jue, 9 sept 2021 a las 9:22, Marcus D. Leech (<patchvonbraun@gmail.com>) escribió:

On 2021-09-08 1:19 p.m., isaac mario tupac davila wrote:

Hi

It seems the problem is the Rx daughterboard because I changed the USRP, used the same flowgraph in GRC and it has worked.

Thanks for the help.

Regards

Isaac T.

If the sample stream is *actual* zeros, then your problem is LIKELY that the board, at some point, got programmed with the wrong version of
  the FPGA code--there have been hardware spins on the N210 that changed the way the ADC was interfaced to the FPGA, and the FPGA code
  reflects that.

rw-r--r-- 1 root root 1297188 Aug 19 20:43 usrp_n210_r2_fpga.bin
-rw-r--r-- 1 root root 1294892 Aug 19 20:43 usrp_n210_r3_fpga.bin
-rw-r--r-- 1 root root 1299084 Aug 19 20:43 usrp_n210_r4_fpga.bin

El lun, 6 sept 2021 a las 17:53, Marcus D. Leech (<patchvonbraun@gmail.com>) escribió:

On 2021-09-06 5:33 p.m., isaac mario tupac davila wrote:

Hi

I've probed A:A, A:B, A:AB, A:BA and had the same behavior. Doesn't change.

regards

Isaac T

This should make NO DIFFERENCE, but what version of Gnu Radio are you using? 

The fact that you're using WX GUI bits and pieces probably means something somewhat old.

The "modern" approach would be to use Qt GUI elements that do very similar things to what
  the (deprecated for quite some time) WX GUI bits and pieces do.

El lun, 6 sept 2021 a las 15:43, Marcus D. Leech (<patchvonbraun@gmail.com>) escribió:

On 2021-09-06 3:24 p.m., isaac mario tupac davila wrote:

Hi.

-- The daughterboard is the BasicRX Daughterboard.

-- I put the address of  my USRP as 192.168.10.1

******************************************************************************************************

soporte@i28:~$ ping 192.168.10.1
PING 192.168.10.1 (192.168.10.1) 56(84) bytes of data.
64 bytes from 192.168.10.1: icmp_seq=1 ttl=64 time=0.051 ms
64 bytes from 192.168.10.1: icmp_seq=2 ttl=64 time=0.051 ms
64 bytes from 192.168.10.1: icmp_seq=3 ttl=64 time=0.049 ms

******************************************************************************************************

soporte@28:~$ uhd_usrp_probe --args type=n200

Try setting a subdev spec of:

A:A

Error: LookupError: KeyError: No devices found for ----->
Device Address:
    type: n200
*******************************************************************************************************
soporte@28:~$ uhd_find_devices
[INFO] [UHD] linux; GNU C++ version 7.5.0; Boost_106501; UHD_3.14.1.1-0-g7c0291ad
--------------------------------------------------
-- UHD Device 0
--------------------------------------------------
Device Address:
    serial: 3176CEA
    addr: 192.168.10.2
    name:
    type: usrp2

*******************************************************************************************************

soporte@28:~$ uhd_usrp_probe
[INFO] [UHD] linux; GNU C++ version 7.5.0; Boost_106501; UHD_3.14.1.1-0-g7c0291ad
[INFO] [USRP2] Opening a USRP2/N-Series device...
[INFO] [USRP2] Current recv frame size: 1472 bytes
[INFO] [USRP2] Current send frame size: 1472 bytes
[WARNING] [USRP2] Unable to identify device - assuming USRP2/N-Series device
[WARNING] [UHD] Unable to set the thread priority. Performance may be negatively affected.
Please see the general application notes in the manual for instructions.
EnvironmentError: OSError: error in pthread_setschedparam
  _____________________________________________________
 /
|       Device: USRP2 / N-Series Device
|     _____________________________________________________
|    /
|   |       Mboard: N???
|   |   mac-addr: 00:2c:00:00:00:24
|   |   ip-addr: 0.0.0.0
|   |   subnet: 0.0.0.0
|   |   gateway: 255.255.255.255
|   |   gpsdo: none
|   |   serial: 3176CEA
|   |   FW Version: 12.3
|   |   FPGA Version: 10.0
|   |  
|   |   Time sources:  none, external, _external_, mimo
|   |   Clock sources: internal, external, mimo
|   |   Sensors: mimo_locked, ref_locked
|   |     _____________________________________________________
|   |    /
|   |   |       RX DSP: 0
|   |   |  
|   |   |   Freq range: -50.000 to 50.000 MHz
|   |     _____________________________________________________
|   |    /
|   |   |       RX DSP: 1
|   |   |  
|   |   |   Freq range: -50.000 to 50.000 MHz
|   |     _____________________________________________________
|   |    /
|   |   |       RX Dboard: A
|   |   |   ID: Basic RX (0x0001)
|   |   |   Serial: 315A5DF
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       RX Frontend: AB
|   |   |   |   Name: BasicRX (AB)
|   |   |   |   Antennas:
|   |   |   |   Sensors:
|   |   |   |   Freq range: -250.000 to 250.000 MHz
|   |   |   |   Gain Elements: None
|   |   |   |   Bandwidth range: 500000000.0 to 500000000.0 step 0.0 Hz
|   |   |   |   Connection Type: IQ
|   |   |   |   Uses LO offset: No
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       RX Frontend: BA
|   |   |   |   Name: BasicRX (BA)
|   |   |   |   Antennas:
|   |   |   |   Sensors:
|   |   |   |   Freq range: -250.000 to 250.000 MHz
|   |   |   |   Gain Elements: None
|   |   |   |   Bandwidth range: 500000000.0 to 500000000.0 step 0.0 Hz
|   |   |   |   Connection Type: QI
|   |   |   |   Uses LO offset: No
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       RX Frontend: A
|   |   |   |   Name: BasicRX (A)
|   |   |   |   Antennas:
|   |   |   |   Sensors:
|   |   |   |   Freq range: -250.000 to 250.000 MHz
|   |   |   |   Gain Elements: None
|   |   |   |   Bandwidth range: 250000000.0 to 250000000.0 step 0.0 Hz
|   |   |   |   Connection Type: I
|   |   |   |   Uses LO offset: No
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       RX Frontend: B
|   |   |   |   Name: BasicRX (B)
|   |   |   |   Antennas:
|   |   |   |   Sensors:
|   |   |   |   Freq range: -250.000 to 250.000 MHz
|   |   |   |   Gain Elements: None
|   |   |   |   Bandwidth range: 250000000.0 to 250000000.0 step 0.0 Hz
|   |   |   |   Connection Type: Q
|   |   |   |   Uses LO offset: No
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       RX Codec: A
|   |   |   |   Name: ??????
|   |   |   |   Gain Elements: None
|   |     _____________________________________________________
|   |    /
|   |   |       TX DSP: 0
|   |   |  
|   |   |   Freq range: -200.000 to 200.000 MHz
|   |     _____________________________________________________
|   |    /
|   |   |       TX Dboard: A
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       TX Frontend: 0
|   |   |   |   Name: Unknown (0xffff) - 0
|   |   |   |   Antennas:
|   |   |   |   Sensors:
|   |   |   |   Freq range: 0.000 to 0.000 MHz
|   |   |   |   Gain Elements: None
|   |   |   |   Bandwidth range: 0.0 to 0.0 step 0.0 Hz
|   |   |   |   Connection Type: IQ
|   |   |   |   Uses LO offset: No
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       TX Codec: A
|   |   |   |   Name: ad9777
|   |   |   |   Gain Elements: None

[WARNING] [UHD] Unable to set the thread priority. Performance may be negatively affected.
Please see the general application notes in the manual for instructions.
EnvironmentError: OSError: error in pthread_setschedparam
[WARNING] [UHD] Unable to set the thread priority. Performance may be negatively affected.
Please see the general application notes in the manual for instructions.
EnvironmentError: OSError: error in pthread_setschedparam

****************************************************************************************************************

I'm not completely sure what is happening. it seems I have an USRP2. I put it wit address 192.168.10.1, but when I run uhd_find_devices is with 192.168.10.2

 ¿Could be that?

Isaac T.

El lun, 6 sept 2021 a las 13:22, Paul Boven (<p.boven@xs4all.nl>) escribió:

Hi Isaac,

On 9/6/21 6:02 PM, isaac mario tupac davila wrote:
> I'm Isaac. I am trying to discover what is happening with my USRP N200.
> I'm sending a signal of 100mVpp and 1MHz from a signal generator to
> channel RF 2 of my USRP N200 but I receive a 0v signal and a constant
> -230db (if I see it in a FFT block).

Please include which RX daughterboard you are using with the N200? What
is RF2 connected to internally in the USRP? Does channel RF1 work for you?

In your flowchart, you're using a center frequency of 1 MHz with a
sampling rate of 10 MS/s, which is a bit odd, although it shouldn't
prevent you from seeing the signal.

Your scope plot and FFT plot look as if you're not receiving anything,
not even noise.

You should probably first of all verify whether your PC can even talk to
the USRP properly, e.g. by running 'uhd_find_devices' and 'uhd_usrp_probe'.

Regards, Paul Boven.