Oversampling mode - 8b mode

[nitinjain]

Hi BLRF community,
I am using BladeRF 2.0 micro xA4.
I am using CLI. Please see configs as below:

^Cnitin@nitin-Vivobook: bladeRF-cli -i
bladeRF> info

Board: Nuand bladeRF 2.0 (bladerf2)
Serial #: ba8f129ed29f4d5ea9680fbd65469abf
VCTCXO DAC calibration: 0x1fff
FPGA size: 49 KLE
FPGA loaded: yes
Flash size: 32 Mbit
USB bus: 4
USB address: 3
USB speed: SuperSpeed
Backend: libusb
Instance: 0

bladeRF> version

bladeRF-cli version: 1.9.0-git-fe3304d7
libbladeRF version: 2.5.1-git-fe3304d7

Firmware version: 2.4.0-git-a3d5c55f
FPGA version: 0.15.3 (configured from SPI flash)

I understand that to use oversampling mode, we need to set bit mode to 8 bits.

I am doing that and trying to set higher sampling rate but it does not seem to work.

Can anybody tell what may be the issue:



set bitmode

Usage: set bitmode <8|16>
Bit Mode: 16 bit samples

bladeRF> set bitmode 8

Bit Mode: 8 bit samples

bladeRF> set samplerate 80M

[ERROR @ host/libraries/libbladeRF/src/board/bladerf2/bladerf2.c:1000] bladerf2_set_rational_sample_rate: dev->board->set_sample_rate(dev, ch, integer_rate, &actual_integer_rate) failed: Provided parameter was out of the allowable range

I, N, D are respectively the Integer, Numerator, and Denominator settings for the Fractional PLL.


Error: Provided parameter was out of the allowable range

bladeRF> set samplerate 61.44M

Setting RX1 sample rate - requested: I= 61440000 N=0/D=1Hz, actual: I= 61440000 N=0/D=1Hz
Setting RX2 sample rate - requested: I= 61440000 N=0/D=1Hz, actual: I= 61440000 N=0/D=1Hz
Setting TX1 sample rate - requested: I= 61440000 N=0/D=1Hz, actual: I= 61440000 N=0/D=1Hz
Setting TX2 sample rate - requested: I= 61440000 N=0/D=1Hz, actual: I= 61440000 N=0/D=1Hz

I, N, D are respectively the Integer, Numerator, and Denominator settings for the Fractional PLL.

bladeRF> set samplerate 92.16M

[ERROR @ host/libraries/libbladeRF/src/board/bladerf2/bladerf2.c:1000] bladerf2_set_rational_sample_rate: dev->board->set_sample_rate(dev, ch, integer_rate, &actual_integer_rate) failed: Provided parameter was out of the allowable range

I, N, D are respectively the Integer, Numerator, and Denominator settings for the Fractional PLL.


Error: Provided parameter was out of the allowable range

bladeRF>
bladeRF> set samplerate 80M

[ERROR @ host/libraries/libbladeRF/src/board/bladerf2/bladerf2.c:1000] bladerf2_set_rational_sample_rate: dev->board->set_sample_rate(dev, ch, integer_rate, &actual_integer_rate) failed: Provided parameter was out of the allowable range

I, N, D are respectively the Integer, Numerator, and Denominator settings for the Fractional PLL.


Error: Provided parameter was out of the allowable range

bladeRF>

[svensteudte]

You need to enable oversampling feature. Unfortunately this is not documented. I came along this thread and looked through the code myself and figured this out.

Code: Select all

gs@gs:~$ bladeRF-cli -i
bladeRF> set feature oversample

  Bit Mode: 8 bit samples
  Feature:  Oversample enabled

  Note: Sample rates must be reassigned
        for OVERSAMPLE changes to take effect


bladeRF> set samplerate 92.16M

  Setting RX1 sample rate - requested: I= 92160000 N=0/D=1Hz, actual: I= 92160000 N=0/D=1Hz
  Setting RX2 sample rate - requested: I= 92160000 N=0/D=1Hz, actual: I= 92160000 N=0/D=1Hz
  Setting TX1 sample rate - requested: I= 92160000 N=0/D=1Hz, actual: I= 92160000 N=0/D=1Hz
  Setting TX2 sample rate - requested: I= 92160000 N=0/D=1Hz, actual: I= 92160000 N=0/D=1Hz

  I, N, D are respectively the Integer, Numerator, and Denominator settings for the Fractional PLL.

bladeRF>